My_Flow

import surprise 

print(surprise.__version__)

# 1.1.1

Surprise 를 이용한 추천 시스템 구축

from surprise import SVD
from surprise import Dataset 
from surprise import accuracy 
from surprise.model_selection import train_test_split

내장 데이터를 로드하고 학습과 테스트 데이터로 분리

data = Dataset.load_builtin('ml-100k') 
trainset, testset = train_test_split(data, test_size=.25, random_state=0)

추천 행렬 분해 알고리즘으로 SVD객체를 생성하고 학습수행

algo = SVD()
algo.fit(trainset)

테스트 데이터 세트에 예상 평점 데이터 예측. test()메소드 호출 시 Prediction 객체의 리스트로 평점 예측 데이터 반환

predictions = algo.test(testset)
print('prediction type :',type(predictions), ' size:',len(predictions))
print('prediction 결과의 최초 5개 추출')
predictions[:5]


prediction type : <class 'list'>  size: 25000
prediction 결과의 최초 5개 추출
[Prediction(uid='120', iid='282', r_ui=4.0, est=3.858408487048643, details={'was_impossible': False}),
 Prediction(uid='882', iid='291', r_ui=4.0, est=3.6035741550069926, details={'was_impossible': False}),
 Prediction(uid='535', iid='507', r_ui=5.0, est=4.129366693106902, details={'was_impossible': False}),
 Prediction(uid='697', iid='244', r_ui=5.0, est=3.8057545869488894, details={'was_impossible': False}),
 Prediction(uid='751', iid='385', r_ui=4.0, est=3.4526579515269047, details={'was_impossible': False})]

[ (pred.uid, pred.iid, pred.est) for pred in predictions[:3] ]


[('120', '282', 3.858408487048643),
 ('882', '291', 3.6035741550069926),
 ('535', '507', 4.129366693106902)]

predict()메소드는 개별 사용자,아이템에 대한 예측 평점 정보를 반환

# 사용자 아이디, 아이템 아이디는 문자열로 입력해야 함. 
uid = str(196)
iid = str(302)
pred = algo.predict(uid, iid)
print(pred)


# user: 196        item: 302        r_ui = None   est = 4.17   {'was_impossible': False}

반환된 Prediction의 리스트 객체를 기반으로 RMSE 평가

accuracy.rmse(predictions)

RMSE: 0.9472
0.9471844228314495

Surprise 주요 모듈 소개

csv 파일로 사용자 평점 데이터 생성

import pandas as pd

ratings = pd.read_csv('./ml-latest-small/ratings.csv')
# ratings_noh.csv 파일로 unload 시 index 와 header를 모두 제거한 새로운 파일 생성.  
ratings.to_csv('./ml-latest-small/ratings_noh.csv', index=False, header=False)

Reader클래스로 파일의 포맷팅 지정하고 Dataset의 load_from_file()을 이용하여 데이터셋 로딩

from surprise import Reader

reader = Reader(line_format='user item rating timestamp', sep=',', rating_scale=(0.5, 5))
data=Dataset.load_from_file('./ml-latest-small/ratings_noh.csv',reader=reader)

학습과 테스트 데이터 세트로 분할하고 SVD로 학습후 테스트데이터 평점 예측 후 RMSE평가

trainset, testset = train_test_split(data, test_size=.25, random_state=0)

# 수행시마다 동일한 결과 도출을 위해 random_state 설정 
algo = SVD(n_factors=50, random_state=0)

# 학습 데이터 세트로 학습 후 테스트 데이터 세트로 평점 예측 후 RMSE 평가
algo.fit(trainset) 
predictions = algo.test( testset )
accuracy.rmse(predictions)



RMSE: 0.8682
0.8681952927143516

판다스 DataFrame기반에서 동일하게 재 수행

import pandas as pd
from surprise import Reader, Dataset

ratings = pd.read_csv('./ml-latest-small/ratings.csv') 
reader = Reader(rating_scale=(0.5, 5.0))

# ratings DataFrame 에서 컬럼은 사용자 아이디, 아이템 아이디, 평점 순서를 지켜야 합니다. 
data = Dataset.load_from_df(ratings[['userId', 'movieId', 'rating']], reader)
trainset, testset = train_test_split(data, test_size=.25, random_state=0)

algo = SVD(n_factors=50, random_state=0)
algo.fit(trainset) 
predictions = algo.test( testset )
accuracy.rmse(predictions)


RMSE: 0.8682
0.8681952927143516

교차 검증(Cross Validation)과 하이퍼 파라미터 튜닝

cross_validate()를 이용한 교차 검증

from surprise.model_selection import cross_validate 

# Pandas DataFrame에서 Surprise Dataset으로 데이터 로딩 
ratings = pd.read_csv('./ml-latest-small/ratings.csv') # reading data in pandas df
reader = Reader(rating_scale=(0.5, 5.0))
data = Dataset.load_from_df(ratings[['userId', 'movieId', 'rating']], reader)

algo = SVD(random_state=0) 
cross_validate(algo, data, measures=['RMSE', 'MAE'], cv=5, verbose=True) 


Evaluating RMSE, MAE of algorithm SVD on 5 split(s).

                  Fold 1  Fold 2  Fold 3  Fold 4  Fold 5  Mean    Std     
RMSE (testset)    0.8754  0.8814  0.8744  0.8721  0.8688  0.8744  0.0042  
MAE (testset)     0.6729  0.6750  0.6708  0.6693  0.6700  0.6716  0.0021  
Fit time          3.07    3.02    3.00    3.00    3.03    3.02    0.03    
Test time         0.08    0.08    0.13    0.08    0.08    0.09    0.02    
{'test_rmse': array([0.87544159, 0.88138787, 0.87435511, 0.87208076, 0.86879243]),
 'test_mae': array([0.67288462, 0.67500158, 0.67084065, 0.66932369, 0.67001214]),
 'fit_time': (3.0681252479553223,
  3.0193707942962646,
  2.999852418899536,
  2.9955246448516846,
  3.032907009124756),
 'test_time': (0.07512664794921875,
  0.07816100120544434,
  0.12555646896362305,
  0.07763862609863281,
  0.07547497749328613)}

GridSearchCV 이용

from surprise.model_selection import GridSearchCV

# 최적화할 파라미터들을 딕셔너리 형태로 지정. 
param_grid = {'n_epochs': [20, 40, 60], 'n_factors': [50, 100, 200] }

# CV를 3개 폴드 세트로 지정, 성능 평가는 rmse, mse 로 수행 하도록 GridSearchCV 구성
gs = GridSearchCV(SVD, param_grid, measures=['rmse', 'mae'], cv=3)
gs.fit(data)

# 최고 RMSE Evaluation 점수와 그때의 하이퍼 파라미터
print(gs.best_score['rmse'])
print(gs.best_params['rmse'])



0.8760298595393691
{'n_epochs': 20, 'n_factors': 50}

# 아래 코드는 train_test_split( )으로 분리되지 않는 Dataset에 fit( )을 호출하여 오류를 발생합니다.
data = Dataset.load_from_df(ratings[['userId', 'movieId', 'rating']], reader)
algo = SVD(n_factors=50, random_state=0)
algo.fit(data)


---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-30-33c08dace4bd> in <module>
      2 data = Dataset.load_from_df(ratings[['userId', 'movieId', 'rating']], reader)
      3 algo = SVD(n_factors=50, random_state=0)
----> 4 algo.fit(data)

~\anaconda3\lib\site-packages\surprise\prediction_algorithms\matrix_factorization.pyx in surprise.prediction_algorithms.matrix_factorization.SVD.fit()

~\anaconda3\lib\site-packages\surprise\prediction_algorithms\matrix_factorization.pyx in surprise.prediction_algorithms.matrix_factorization.SVD.sgd()

AttributeError: 'DatasetAutoFolds' object has no attribute 'global_mean'

DatasetAutoFolds를 이용한 전체 데이터를 TrainSet클래스 변환

from surprise.dataset import DatasetAutoFolds

reader = Reader(line_format='user item rating timestamp', sep=',', rating_scale=(0.5, 5))
# DatasetAutoFolds 클래스를 ratings_noh.csv 파일 기반으로 생성. 
data_folds = DatasetAutoFolds(ratings_file='./ml-latest-small/ratings_noh.csv', reader=reader)

#전체 데이터를 학습데이터로 생성함. 
trainset = data_folds.build_full_trainset()

SVD로 학습

algo = SVD(n_epochs=20, n_factors=50, random_state=0)
algo.fit(trainset)

# 영화에 대한 상세 속성 정보 DataFrame로딩
movies = pd.read_csv('./ml-latest-small/movies.csv')

# userId=9 의 movieId 데이터 추출하여 movieId=42 데이터가 있는지 확인. 
movieIds = ratings[ratings['userId']==9]['movieId']
if movieIds[movieIds==42].count() == 0:
    print('사용자 아이디 9는 영화 아이디 42의 평점 없음')

print(movies[movies['movieId']==42])


사용자 아이디 9는 영화 아이디 42의 평점 없음
    movieId                   title              genres
38       42  Dead Presidents (1995)  Action|Crime|Drama

uid = str(9)
iid = str(42)

pred = algo.predict(uid, iid, verbose=True)


# user: 9          item: 42         r_ui = None   est = 3.13   {'was_impossible': False}

def get_unseen_surprise(ratings, movies, userId):
    #입력값으로 들어온 userId에 해당하는 사용자가 평점을 매긴 모든 영화를 리스트로 생성
    seen_movies = ratings[ratings['userId']== userId]['movieId'].tolist()
    
    # 모든 영화들의 movieId를 리스트로 생성. 
    total_movies = movies['movieId'].tolist()
    
    # 모든 영화들의 movieId중 이미 평점을 매긴 영화의 movieId를 제외하여 리스트로 생성
    unseen_movies= [movie for movie in total_movies if movie not in seen_movies]
    print('평점 매긴 영화수:',len(seen_movies), '추천대상 영화수:',len(unseen_movies), \
          '전체 영화수:',len(total_movies))
    
    return unseen_movies

unseen_movies = get_unseen_surprise(ratings, movies, 9)


평점 매긴 영화수: 46 추천대상 영화수: 9696 전체 영화수: 9742

def recomm_movie_by_surprise(algo, userId, unseen_movies, top_n=10):
    # 알고리즘 객체의 predict() 메서드를 평점이 없는 영화에 반복 수행한 후 결과를 list 객체로 저장
    predictions = [algo.predict(str(userId), str(movieId)) for movieId in unseen_movies]
    
    # predictions list 객체는 surprise의 Predictions 객체를 원소로 가지고 있음.
    # [Prediction(uid='9', iid='1', est=3.69), Prediction(uid='9', iid='2', est=2.98),,,,]
    # 이를 est 값으로 정렬하기 위해서 아래의 sortkey_est 함수를 정의함.
    # sortkey_est 함수는 list 객체의 sort() 함수의 키 값으로 사용되어 정렬 수행.
    def sortkey_est(pred):
        return pred.est
    
    # sortkey_est( ) 반환값의 내림 차순으로 정렬 수행하고 top_n개의 최상위 값 추출.
    predictions.sort(key=sortkey_est, reverse=True)
    top_predictions= predictions[:top_n]
    
    # top_n으로 추출된 영화의 정보 추출. 영화 아이디, 추천 예상 평점, 제목 추출
    top_movie_ids = [ int(pred.iid) for pred in top_predictions]
    top_movie_rating = [ pred.est for pred in top_predictions]
    top_movie_titles = movies[movies.movieId.isin(top_movie_ids)]['title']
    top_movie_preds = [ (id, title, rating) for id, title, rating in zip(top_movie_ids, top_movie_titles, top_movie_rating)]
    
    return top_movie_preds

unseen_movies = get_unseen_surprise(ratings, movies, 9)
top_movie_preds = recomm_movie_by_surprise(algo, 9, unseen_movies, top_n=10)
print('##### Top-10 추천 영화 리스트 #####')

for top_movie in top_movie_preds:
    print(top_movie[1], ":", top_movie[2])
    
    
    
평점 매긴 영화수: 46 추천대상 영화수: 9696 전체 영화수: 9742
##### Top-10 추천 영화 리스트 #####
Usual Suspects, The (1995) : 4.306302135700814
Star Wars: Episode IV - A New Hope (1977) : 4.281663842987387
Pulp Fiction (1994) : 4.278152632122759
Silence of the Lambs, The (1991) : 4.226073566460876
Godfather, The (1972) : 4.1918097904381995
Streetcar Named Desire, A (1951) : 4.154746591122658
Star Wars: Episode V - The Empire Strikes Back (1980) : 4.122016128534504
Star Wars: Episode VI - Return of the Jedi (1983) : 4.108009609093436
Goodfellas (1990) : 4.083464936588478
Glory (1989) : 4.07887165526957

import numpy as np

# 원본 행렬 R 생성, 분해 행렬 P와 Q 초기화, 잠재요인 차원 K는 3 설정. 
R = np.array([[4, np.NaN, np.NaN, 2, np.NaN ],
              [np.NaN, 5, np.NaN, 3, 1 ],
              [np.NaN, np.NaN, 3, 4, 4 ],
              [5, 2, 1, 2, np.NaN ]])

num_users, num_items = R.shape
K=3

# P와 Q 매트릭스의 크기를 지정하고 정규분포를 가진 random한 값으로 입력합니다. 
np.random.seed(1)
P = np.random.normal(scale=1./K, size=(num_users, K))
Q = np.random.normal(scale=1./K, size=(num_items, K))
print("P:",P)
print("Q:",Q)


P: [[ 0.54144845 -0.2039188  -0.17605725]
 [-0.35765621  0.28846921 -0.76717957]
 [ 0.58160392 -0.25373563  0.10634637]
 [-0.08312346  0.48736931 -0.68671357]]
Q: [[-0.1074724  -0.12801812  0.37792315]
 [-0.36663042 -0.05747607 -0.29261947]
 [ 0.01407125  0.19427174 -0.36687306]
 [ 0.38157457  0.30053024  0.16749811]
 [ 0.30028532 -0.22790929 -0.04096341]]

비용계산 함수를 생성. 분해된 행렬 P와 Q.T를 내적하여 예측 행렬 생성하고

실제 행렬에서 널이 아닌 값의 위치에 있는 값만 예측 행렬의 값과 비교하여 RMSE값을 계산하고 반환

from sklearn.metrics import mean_squared_error

def get_rmse(R, P, Q, non_zeros):
    error = 0
    # 두개의 분해된 행렬 P와 Q.T의 내적으로 예측 R 행렬 생성
    full_pred_matrix = np.dot(P, Q.T)
    
    # 실제 R 행렬에서 널이 아닌 값의 위치 인덱스 추출하여 실제 R 행렬과 예측 행렬의 RMSE 추출
    x_non_zero_ind = [non_zero[0] for non_zero in non_zeros]
    y_non_zero_ind = [non_zero[1] for non_zero in non_zeros]
    R_non_zeros = R[x_non_zero_ind, y_non_zero_ind]
    full_pred_matrix_non_zeros = full_pred_matrix[x_non_zero_ind, y_non_zero_ind]
      
    mse = mean_squared_error(R_non_zeros, full_pred_matrix_non_zeros)
    rmse = np.sqrt(mse)
    
    return rmse

경사하강법에 기반하여 P와 Q의 원소들을 업데이트 수행

# R > 0 인 행 위치, 열 위치, 값을 non_zeros 리스트에 저장. 
non_zeros = [ (i, j, R[i,j]) for i in range(num_users) for j in range(num_items) if R[i,j] > 0 ]
# 아래 식과 똑같은 식임
# non_zeroes=[]
# for j in range(num_items) :
#     for i in range(num_users):
#         if R[i, j] > 0:
#             non_zeros
    
steps=1000
learning_rate=0.01
r_lambda=0.01

# SGD 기법으로 P와 Q 매트릭스를 계속 업데이트. 
for step in range(steps):
    for i, j, r in non_zeros:
        # 실제 값과 예측 값의 차이인 오류 값 구함
        eij = r - np.dot(P[i, :], Q[j, :].T)
        # Regularization을 반영한 SGD 업데이트 공식 적용
        P[i,:] = P[i,:] + learning_rate*(eij * Q[j, :] - r_lambda*P[i,:])
        Q[j,:] = Q[j,:] + learning_rate*(eij * P[i, :] - r_lambda*Q[j,:])

    rmse = get_rmse(R, P, Q, non_zeros)
    if (step % 50) == 0 :
        print("### iteration step : ", step," rmse : ", rmse)
# rnse가 계속 줄어드는 결과가 나옴



### iteration step :  0  rmse :  3.2388050277987723
### iteration step :  50  rmse :  0.4876723101369648
### iteration step :  100  rmse :  0.1564340384819247
### iteration step :  150  rmse :  0.07455141311978046
### iteration step :  200  rmse :  0.04325226798579314
### iteration step :  250  rmse :  0.029248328780878973
### iteration step :  300  rmse :  0.022621116143829466
### iteration step :  350  rmse :  0.019493636196525135
### iteration step :  400  rmse :  0.018022719092132704
### iteration step :  450  rmse :  0.01731968595344266
### iteration step :  500  rmse :  0.016973657887570753
### iteration step :  550  rmse :  0.016796804595895633
### iteration step :  600  rmse :  0.01670132290188466
### iteration step :  650  rmse :  0.01664473691247669
### iteration step :  700  rmse :  0.016605910068210026
### iteration step :  750  rmse :  0.016574200475705
### iteration step :  800  rmse :  0.01654431582921597
### iteration step :  850  rmse :  0.01651375177473524
### iteration step :  900  rmse :  0.01648146573819501
### iteration step :  950  rmse :  0.016447171683479155

pred_matrix = np.dot(P, Q.T)
print('예측 행렬:\n', np.round(pred_matrix, 3))


예측 행렬:
 [[3.991 0.897 1.306 2.002 1.663]
 [6.696 4.978 0.979 2.981 1.003]
 [6.677 0.391 2.987 3.977 3.986]
 [4.968 2.005 1.006 2.017 1.14 ]]

R = np.array([[4, np.NaN, np.NaN, 2, np.NaN ],
              [np.NaN, 5, np.NaN, 3, 1 ],
              [np.NaN, np.NaN, 3, 4, 4 ],
              [5, 2, 1, 2, np.NaN ]])

행렬 분해 기반의 잠재 요인 협업 필터링 실습

사용자아이템평점 행렬 속 잠재요인 추출 .. svd 6장참고 경사하강법 기반의 행렬 분해 함수 생성

def matrix_factorization(R, K, steps=200, learning_rate=0.01, r_lambda = 0.01):
    num_users, num_items = R.shape
    # P와 Q 매트릭스의 크기를 지정하고 정규분포를 가진 랜덤한 값으로 입력합니다. 
    np.random.seed(1)
    P = np.random.normal(scale=1./K, size=(num_users, K))
    Q = np.random.normal(scale=1./K, size=(num_items, K))

    break_count = 0
    
    # R > 0 인 행 위치, 열 위치, 값을 non_zeros 리스트 객체에 저장. 
    non_zeros = [ (i, j, R[i,j]) for i in range(num_users) for j in range(num_items) if R[i,j] > 0 ]
   
    # SGD기법으로 P와 Q 매트릭스를 계속 업데이트. 
    for step in range(steps):
        for i, j, r in non_zeros:
            # 실제 값과 예측 값의 차이인 오류 값 구함
            eij = r - np.dot(P[i, :], Q[j, :].T)
            # Regularization을 반영한 SGD 업데이트 공식 적용
            P[i,:] = P[i,:] + learning_rate*(eij * Q[j, :] - r_lambda*P[i,:])
            Q[j,:] = Q[j,:] + learning_rate*(eij * P[i, :] - r_lambda*Q[j,:])
       
        rmse = get_rmse(R, P, Q, non_zeros)
        if (step % 10) == 0 :
            print("### iteration step : ", step," rmse : ", rmse)
            
    return P, Q

import pandas as pd
import numpy as np

movies = pd.read_csv('./ml-latest-small/movies.csv')
ratings = pd.read_csv('./ml-lat est-small/ratings.csv')
ratings = ratings[['userId', 'movieId', 'rating']]
ratings_matrix = ratings.pivot_table('rating', index='userId', columns='movieId')

# title 컬럼을 얻기 이해 movies 와 조인 수행
rating_movies = pd.merge(ratings, movies, on='movieId')

# columns='title' 로 title 컬럼으로 pivot 수행. 
ratings_matrix = rating_movies.pivot_table('rating', index='userId', columns='title')

P, Q = matrix_factorization(ratings_matrix.values, K=50, steps=200, learning_rate=0.01, r_lambda = 0.01)
pred_matrix = np.dot(P, Q.T)


### iteration step :  0  rmse :  2.9023619751336867
### iteration step :  10  rmse :  0.7335768591017927
### iteration step :  20  rmse :  0.5115539026853442
### iteration step :  30  rmse :  0.37261628282537446
### iteration step :  40  rmse :  0.2960818299181014
### iteration step :  50  rmse :  0.2520353192341642
### iteration step :  60  rmse :  0.22487503275269854
### iteration step :  70  rmse :  0.20685455302331537
### iteration step :  80  rmse :  0.19413418783028685
### iteration step :  90  rmse :  0.18470082002720403
### iteration step :  100  rmse :  0.17742927527209104
### iteration step :  110  rmse :  0.17165226964707486
### iteration step :  120  rmse :  0.1669518194687172
### iteration step :  130  rmse :  0.16305292191997542
### iteration step :  140  rmse :  0.15976691929679643
### iteration step :  150  rmse :  0.1569598699945732
### iteration step :  160  rmse :  0.15453398186715428
### iteration step :  170  rmse :  0.15241618551077643
### iteration step :  180  rmse :  0.15055080739628307
### iteration step :  190  rmse :  0.1488947091323209

ratings_pred_matrix = pd.DataFrame(data=pred_matrix, index= ratings_matrix.index,
                                   columns = ratings_matrix.columns)

ratings_pred_matrix.head(3)

title	'71 (2014)	'Hellboy': The Seeds of Creation (2004)	'Round Midnight (1986)	'Salem's Lot (2004)	'Til There Was You (1997)	'Tis the Season for Love (2015)	'burbs, The (1989)	'night Mother (1986)	(500) Days of Summer (2009)	*batteries not included (1987)	...	Zulu (2013)	[REC] (2007)	[REC]² (2009)	[REC]³ 3 Génesis (2012)	anohana: The Flower We Saw That Day - The Movie (2013)	eXistenZ (1999)	xXx (2002)	xXx: State of the Union (2005)	¡Three Amigos! (1986)	À nous la liberté (Freedom for Us) (1931)
userId																					
1	3.055084	4.092018	3.564130	4.502167	3.981215	1.271694	3.603274	2.333266	5.091749	3.972454	...	1.402608	4.208382	3.705957	2.720514	2.787331	3.475076	3.253458	2.161087	4.010495	0.859474
2	3.170119	3.657992	3.308707	4.166521	4.311890	1.275469	4.237972	1.900366	3.392859	3.647421	...	0.973811	3.528264	3.361532	2.672535	2.404456	4.232789	2.911602	1.634576	4.135735	0.725684
3	2.307073	1.658853	1.443538	2.208859	2.229486	0.780760	1.997043	0.924908	2.970700	2.551446	...	0.520354	1.709494	2.281596	1.782833	1.635173	1.323276	2.887580	1.042618	2.293890	0.396941
3 rows × 9719 columns

def get_unseen_movies(ratings_matrix, userId):
    # userId로 입력받은 사용자의 모든 영화정보 추출하여 Series로 반환함. 
    # 반환된 user_rating 은 영화명(title)을 index로 가지는 Series 객체임. 
    user_rating = ratings_matrix.loc[userId,:]
    
    # user_rating이 0보다 크면 기존에 관람한 영화임. 대상 index를 추출하여 list 객체로 만듬
    already_seen = user_rating[ user_rating > 0].index.tolist()
    
    # 모든 영화명을 list 객체로 만듬. 
    movies_list = ratings_matrix.columns.tolist()
    
    # list comprehension으로 already_seen에 해당하는 movie는 movies_list에서 제외함. 
    unseen_list = [ movie for movie in movies_list if movie not in already_seen]
    
    return unseen_list

def recomm_movie_by_userid(pred_df, userId, unseen_list, top_n=10):
    # 예측 평점 DataFrame에서 사용자id index와 unseen_list로 들어온 영화명 컬럼을 추출하여
    # 가장 예측 평점이 높은 순으로 정렬함. 
    recomm_movies = pred_df.loc[userId, unseen_list].sort_values(ascending=False)[:top_n]
    return recomm_movies

# 사용자가 관람하지 않는 영화명 추출   
unseen_list = get_unseen_movies(ratings_matrix, 9)

# 잠재요인 기반 협업 필터링으로 영화 추천 
recomm_movies = recomm_movie_by_userid(ratings_pred_matrix, 9, unseen_list, top_n=10)

# 평점 데이타를 DataFrame으로 생성. 
recomm_movies = pd.DataFrame(data=recomm_movies.values,index=recomm_movies.index,columns=['pred_score'])
recomm_movies



	pred_score
title	
Rear Window (1954)	5.704612
South Park: Bigger, Longer and Uncut (1999)	5.451100
Rounders (1998)	5.298393
Blade Runner (1982)	5.244951
Roger & Me (1989)	5.191962
Gattaca (1997)	5.183179
Ben-Hur (1959)	5.130463
Rosencrantz and Guildenstern Are Dead (1990)	5.087375
Big Lebowski, The (1998)	5.038690
Star Wars: Episode V - The Empire Strikes Back (1980)	4.989601

데이터 로드

import pandas as pd
import numpy as np

movies = pd.read_csv('./ml-latest-small/movies.csv')
ratings = pd.read_csv('./ml-latest-small/ratings.csv')
print(movies.shape)
print(ratings.shape)



(9742, 3)
(100836, 4)

movies.head()

	movieId	title	genres
0	1	Toy Story (1995)	Adventure|Animation|Children|Comedy|Fantasy
1	2	Jumanji (1995)	Adventure|Children|Fantasy
2	3	Grumpier Old Men (1995)	Comedy|Romance
3	4	Waiting to Exhale (1995)	Comedy|Drama|Romance
4	5	Father of the Bride Part II (1995)	Comedy

ratings.head()

	userId	movieId	rating	timestamp
0	1	1	4.0	964982703
1	1	3	4.0	964981247
2	1	6	4.0	964982224
3	1	47	5.0	964983815
4	1	50	5.0	964982931

로우레벨 사용자 평점 데이터를 사용자-아이템 평점 행렬로 변환

ratings = ratings[['userId', 'movieId', 'rating']]
ratings_matrix = ratings.pivot_table('rating', index='userId', columns='movieId')
ratings_matrix.head(3)


movieId	1	2	3	4	5	6	7	8	9	10	...	193565	193567	193571	193573	193579	193581	193583	193585	193587	193609
userId																					
1	4.0	NaN	4.0	NaN	NaN	4.0	NaN	NaN	NaN	NaN	...	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN
2	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	...	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN
3	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	...	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN	NaN
3 rows × 9724 columns

# title 컬럼을 얻기 이해 movies 와 조인 수행
rating_movies = pd.merge(ratings, movies, on='movieId')

# columns='title' 로 title 컬럼으로 pivot 수행. 
ratings_matrix = rating_movies.pivot_table('rating', index='userId', columns='title')

# NaN 값을 모두 0 으로 변환 // null 이니깐 ... 희소행렬로 처리
ratings_matrix = ratings_matrix.fillna(0)
ratings_matrix.head(3)



itle	'71 (2014)	'Hellboy': The Seeds of Creation (2004)	'Round Midnight (1986)	'Salem's Lot (2004)	'Til There Was You (1997)	'Tis the Season for Love (2015)	'burbs, The (1989)	'night Mother (1986)	(500) Days of Summer (2009)	*batteries not included (1987)	...	Zulu (2013)	[REC] (2007)	[REC]² (2009)	[REC]³ 3 Génesis (2012)	anohana: The Flower We Saw That Day - The Movie (2013)	eXistenZ (1999)	xXx (2002)	xXx: State of the Union (2005)	¡Three Amigos! (1986)	À nous la liberté (Freedom for Us) (1931)
userId																					
1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	...	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	4.0	0.0
2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	...	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
3	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	...	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
3 rows × 9719 columns

영화와 영화들 간 유사도 산출

ratings_matrix_T = ratings_matrix.transpose() #행, 렬을 바꿔줌
ratings_matrix_T.head(3)



userId	1	2	3	4	5	6	7	8	9	10	...	601	602	603	604	605	606	607	608	609	610
title																					
'71 (2014)	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	...	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	4.0
'Hellboy': The Seeds of Creation (2004)	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	...	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
'Round Midnight (1986)	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	...	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
3 rows × 610 columns

ratings_matrix_T.shape


# (9719, 610)

from sklearn.metrics.pairwise import cosine_similarity

item_sim = cosine_similarity(ratings_matrix_T, ratings_matrix_T)

# cosine_similarity() 로 반환된 넘파이 행렬을 영화명을 매핑하여 DataFrame으로 변환
item_sim_df = pd.DataFrame(data=item_sim, index=ratings_matrix.columns,
                          columns=ratings_matrix.columns)
print(item_sim_df.shape)
item_sim_df.head(3)


(9719, 9719)
title	'71 (2014)	'Hellboy': The Seeds of Creation (2004)	'Round Midnight (1986)	'Salem's Lot (2004)	'Til There Was You (1997)	'Tis the Season for Love (2015)	'burbs, The (1989)	'night Mother (1986)	(500) Days of Summer (2009)	*batteries not included (1987)	...	Zulu (2013)	[REC] (2007)	[REC]² (2009)	[REC]³ 3 Génesis (2012)	anohana: The Flower We Saw That Day - The Movie (2013)	eXistenZ (1999)	xXx (2002)	xXx: State of the Union (2005)	¡Three Amigos! (1986)	À nous la liberté (Freedom for Us) (1931)
title																					
'71 (2014)	1.0	0.000000	0.000000	0.0	0.0	0.0	0.000000	0.0	0.141653	0.0	...	0.0	0.342055	0.543305	0.707107	0.0	0.0	0.139431	0.327327	0.0	0.0
'Hellboy': The Seeds of Creation (2004)	0.0	1.000000	0.707107	0.0	0.0	0.0	0.000000	0.0	0.000000	0.0	...	0.0	0.000000	0.000000	0.000000	0.0	0.0	0.000000	0.000000	0.0	0.0
'Round Midnight (1986)	0.0	0.707107	1.000000	0.0	0.0	0.0	0.176777	0.0	0.000000	0.0	...	0.0	0.000000	0.000000	0.000000	0.0	0.0	0.000000	0.000000	0.0	0.0
3 rows × 9719 columns

item_sim_df["Godfather, The (1972)"].sort_values(ascending=False)[:6]


title
Godfather, The (1972)                        1.000000
Godfather: Part II, The (1974)               0.821773
Goodfellas (1990)                            0.664841
One Flew Over the Cuckoo's Nest (1975)       0.620536
Star Wars: Episode IV - A New Hope (1977)    0.595317
Fargo (1996)                                 0.588614
Name: Godfather, The (1972), dtype: float64

item_sim_df["Inception (2010)"].sort_values(ascending=False)[1:6] # 자기자신 빼고


title
Dark Knight, The (2008)          0.727263
Inglourious Basterds (2009)      0.646103
Shutter Island (2010)            0.617736
Dark Knight Rises, The (2012)    0.617504
Fight Club (1999)                0.615417
Name: Inception (2010), dtype: float64

아이템 기반 인접 이웃 협업 필터링으로 개인화된 영화 추천

def predict_rating(ratings_arr, item_sim_arr ):
    ratings_pred = ratings_arr.dot(item_sim_arr)/ np.array([np.abs(item_sim_arr).sum(axis=1)])
    return ratings_pred

ratings_matrix.head(3)

title	'71 (2014)	'Hellboy': The Seeds of Creation (2004)	'Round Midnight (1986)	'Salem's Lot (2004)	'Til There Was You (1997)	'Tis the Season for Love (2015)	'burbs, The (1989)	'night Mother (1986)	(500) Days of Summer (2009)	*batteries not included (1987)	...	Zulu (2013)	[REC] (2007)	[REC]² (2009)	[REC]³ 3 Génesis (2012)	anohana: The Flower We Saw That Day - The Movie (2013)	eXistenZ (1999)	xXx (2002)	xXx: State of the Union (2005)	¡Three Amigos! (1986)	À nous la liberté (Freedom for Us) (1931)
userId																					
1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	...	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	4.0	0.0
2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	...	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
3	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	...	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
3 rows × 9719 columns

ratings_pred = predict_rating(ratings_matrix.values , item_sim_df.values)
ratings_pred_matrix = pd.DataFrame(data=ratings_pred, index= ratings_matrix.index,
                                   columns = ratings_matrix.columns)
print(ratings_pred_matrix.shape)
ratings_pred_matrix.head(3)


(610, 9719)
title	'71 (2014)	'Hellboy': The Seeds of Creation (2004)	'Round Midnight (1986)	'Salem's Lot (2004)	'Til There Was You (1997)	'Tis the Season for Love (2015)	'burbs, The (1989)	'night Mother (1986)	(500) Days of Summer (2009)	*batteries not included (1987)	...	Zulu (2013)	[REC] (2007)	[REC]² (2009)	[REC]³ 3 Génesis (2012)	anohana: The Flower We Saw That Day - The Movie (2013)	eXistenZ (1999)	xXx (2002)	xXx: State of the Union (2005)	¡Three Amigos! (1986)	À nous la liberté (Freedom for Us) (1931)
userId																					
1	0.070345	0.577855	0.321696	0.227055	0.206958	0.194615	0.249883	0.102542	0.157084	0.178197	...	0.113608	0.181738	0.133962	0.128574	0.006179	0.212070	0.192921	0.136024	0.292955	0.720347
2	0.018260	0.042744	0.018861	0.000000	0.000000	0.035995	0.013413	0.002314	0.032213	0.014863	...	0.015640	0.020855	0.020119	0.015745	0.049983	0.014876	0.021616	0.024528	0.017563	0.000000
3	0.011884	0.030279	0.064437	0.003762	0.003749	0.002722	0.014625	0.002085	0.005666	0.006272	...	0.006923	0.011665	0.011800	0.012225	0.000000	0.008194	0.007017	0.009229	0.010420	0.084501
3 rows × 9719 columns

가중치 평점 부여뒤에 예측 성능 평가 MSE를 구함

from sklearn.metrics import mean_squared_error

# 사용자가 평점을 부여한 영화에 대해서만 예측 성능 평가 MSE 를 구함. 
def get_mse(pred, actual):
    # Ignore nonzero terms.
    pred = pred[actual.nonzero()].flatten()
    actual = actual[actual.nonzero()].flatten()
    return mean_squared_error(pred, actual)

print('아이템 기반 모든 인접 이웃 MSE: ', get_mse(ratings_pred, ratings_matrix.values ))



# 아이템 기반 모든 인접 이웃 MSE:  9.895354759094706

top-n 유사도를 가진 데이터들에 대해서만 예측 평점 계산

def predict_rating_topsim(ratings_arr, item_sim_arr, n=20):
    # 사용자-아이템 평점 행렬 크기만큼 0으로 채운 예측 행렬 초기화
    pred = np.zeros(ratings_arr.shape)

    # 사용자-아이템 평점 행렬의 열 크기만큼 Loop 수행. 
    for col in range(ratings_arr.shape[1]):
        # 유사도 행렬에서 유사도가 큰 순으로 n개 데이터 행렬의 index 반환
        top_n_items = [np.argsort(item_sim_arr[:, col])[:-n-1:-1]]
        # 개인화된 예측 평점을 계산
        for row in range(ratings_arr.shape[0]):
            pred[row, col] = item_sim_arr[col, :][top_n_items].dot(ratings_arr[row, :][top_n_items].T) 
            pred[row, col] /= np.sum(np.abs(item_sim_arr[col, :][top_n_items]))        
    return pred

top-n 유사도 기반의 예측 평점 및 MSE 계산

ratings_pred = predict_rating_topsim(ratings_matrix.values , item_sim_df.values, n=20)
print('아이템 기반 인접 TOP-20 이웃 MSE: ', get_mse(ratings_pred, ratings_matrix.values ))


# 계산된 예측 평점 데이터는 DataFrame으로 재생성
ratings_pred_matrix = pd.DataFrame(data=ratings_pred, index= ratings_matrix.index,
                                   columns = ratings_matrix.columns)
                                   
                                   
                                   
# 아이템 기반 인접 TOP-20 이웃 MSE:  3.69501623729494

user_rating_id = ratings_matrix.loc[9, :]
user_rating_id[ user_rating_id > 0].sort_values(ascending=False)[:10]

title
Adaptation (2002)                                                                 5.0
Austin Powers in Goldmember (2002)                                                5.0
Lord of the Rings: The Fellowship of the Ring, The (2001)                         5.0
Lord of the Rings: The Two Towers, The (2002)                                     5.0
Producers, The (1968)                                                             5.0
Citizen Kane (1941)                                                               5.0
Raiders of the Lost Ark (Indiana Jones and the Raiders of the Lost Ark) (1981)    5.0
Back to the Future (1985)                                                         5.0
Glengarry Glen Ross (1992)                                                        4.0
Sunset Blvd. (a.k.a. Sunset Boulevard) (1950)                                     4.0
Name: 9, dtype: float64

사용자가 관람하지 않은 영화 중에서 아이템 기반의 인접 이웃 협업 필터링으로 영화 추천

def get_unseen_movies(ratings_matrix, userId):
    # userId로 입력받은 사용자의 모든 영화정보 추출하여 Series로 반환함. 
    # 반환된 user_rating 은 영화명(title)을 index로 가지는 Series 객체임. 
    user_rating = ratings_matrix.loc[userId,:]
    
    # user_rating이 0보다 크면 기존에 관람한 영화임. 대상 index를 추출하여 list 객체로 만듬
    already_seen = user_rating[ user_rating > 0].index.tolist()
    
    # 모든 영화명을 list 객체로 만듬. 
    movies_list = ratings_matrix.columns.tolist()
    
    # list comprehension으로 already_seen에 해당하는 movie는 movies_list에서 제외함. 
    unseen_list = [ movie for movie in movies_list if movie not in already_seen]
    
    return unseen_list

아이템 기반 유사도로 평점이 부여된 데이터 세트에서 해당 사용자가 관람하지 않은 영화들의 예측 평점이 가장 높은 영화를 추천

def recomm_movie_by_userid(pred_df, userId, unseen_list, top_n=10):
    # 예측 평점 DataFrame에서 사용자id index와 unseen_list로 들어온 영화명 컬럼을 추출하여
    # 가장 예측 평점이 높은 순으로 정렬함. 
    recomm_movies = pred_df.loc[userId, unseen_list].sort_values(ascending=False)[:top_n]
    return recomm_movies
    
# 사용자가 관람하지 않는 영화명 추출   
unseen_list = get_unseen_movies(ratings_matrix, 9)

# 아이템 기반의 인접 이웃 협업 필터링으로 영화 추천 
recomm_movies = recomm_movie_by_userid(ratings_pred_matrix, 9, unseen_list, top_n=10)

# 평점 데이타를 DataFrame으로 생성. 
recomm_movies = pd.DataFrame(data=recomm_movies.values,index=recomm_movies.index,columns=['pred_score'])
recomm_movies



	pred_score
title	
Shrek (2001)	0.866202
Spider-Man (2002)	0.857854
Last Samurai, The (2003)	0.817473
Indiana Jones and the Temple of Doom (1984)	0.816626
Matrix Reloaded, The (2003)	0.800990
Harry Potter and the Sorcerer's Stone (a.k.a. Harry Potter and the Philosopher's Stone) (2001)	0.765159
Gladiator (2000)	0.740956
Matrix, The (1999)	0.732693
Pirates of the Caribbean: The Curse of the Black Pearl (2003)	0.689591
Lord of the Rings: The Return of the King, The (2003)	0.676711

컨텐츠 기반 필터링 실습 – TMDB 5000 Movie Dataset

import pandas as pd
import numpy as np
import warnings; warnings.filterwarnings('ignore')

movies =pd.read_csv('./tmdb-5000-movie-dataset/tmdb_5000_movies.csv')
print(movies.shape)
movies.head(1)


(4803, 20)
budget	genres	homepage	id	keywords	original_language	original_title	overview	popularity	production_companies	production_countries	release_date	revenue	runtime	spoken_languages	status	tagline	title	vote_average	vote_count
0	237000000	[{"id": 28, "name": "Action"}, {"id": 12, "nam...	http://www.avatarmovie.com/	19995	[{"id": 1463, "name": "culture clash"}, {"id":...	en	Avatar	In the 22nd century, a paraplegic Marine is di...	150.437577	[{"name": "Ingenious Film Partners", "id": 289...	[{"iso_3166_1": "US", "name": "United States o...	2009-12-10	2787965087	162.0	[{"iso_639_1": "en", "name": "English"}, {"iso...	Released	Enter the World of Pandora.	Avatar	7.2	11800

movies_df = movies[['id','title', 'genres', 'vote_average', 'vote_count',
                 'popularity', 'keywords', 'overview']]

pd.set_option('max_colwidth', 100)
movies_df[['genres','keywords']][:1]



genres	keywords
0	[{"id": 28, "name": "Action"}, {"id": 12, "name": "Adventure"}, {"id": 14, "name": "Fantasy"}, {...	[{"id": 1463, "name": "culture clash"}, {"id": 2964, "name": "future"}, {"id": 3386, "name": "sp...

movies_df.info()

<class 'pandas.core.frame.DataFrame'>
RangeIndex: 4803 entries, 0 to 4802
Data columns (total 8 columns):
 #   Column        Non-Null Count  Dtype  
---  ------        --------------  -----  
 0   id            4803 non-null   int64  
 1   title         4803 non-null   object 
 2   genres        4803 non-null   object 
 3   vote_average  4803 non-null   float64
 4   vote_count    4803 non-null   int64  
 5   popularity    4803 non-null   float64
 6   keywords      4803 non-null   object 
 7   overview      4800 non-null   object 
dtypes: float64(2), int64(2), object(4)
memory usage: 300.3+ KB

텍스트 문자 1차 가공. 파이썬 딕셔너리 변환 후 리스트 형태로 변환

from ast import literal_eval # 문자 가공해서 파이썬 객체생성해줌 // 문자그대로 평가

movies_df['genres'] = movies_df['genres'].apply(literal_eval)
movies_df['keywords'] = movies_df['keywords'].apply(literal_eval)

movies_df['genres'].head(1)


0    [{'id': 28, 'name': 'Action'}, {'id': 12, 'name': 'Adventure'}, {'id': 14, 'name': 'Fantasy'}, {...
Name: genres, dtype: object

movies_df['genres'] = movies_df['genres'].apply(lambda x : [ y['name'] for y in x])
movies_df['keywords'] = movies_df['keywords'].apply(lambda x : [ y['name'] for y in x])
movies_df[['genres', 'keywords']][:1]


genres	keywords
0	[Action, Adventure, Fantasy, Science Fiction]	[culture clash, future, space war, space colony, society, space travel, futuristic, romance, spa...

type(('*').join(['test', 'test2']))


str

from sklearn.feature_extraction.text import CountVectorizer

# CountVectorizer를 적용하기 위해 공백문자로 word 단위가 구분되는 문자열로 변환. 
movies_df['genres_literal'] = movies_df['genres'].apply(lambda x : (' ').join(x))
count_vect = CountVectorizer(min_df=0, ngram_range=(1,2))
genre_mat = count_vect.fit_transform(movies_df['genres_literal'])
print(genre_mat.shape)
#개별장르가 276개


# (4803, 276)

장르에 따른 영화별 코사인 유사도 추출

from sklearn.metrics.pairwise import cosine_similarity

genre_sim = cosine_similarity(genre_mat, genre_mat)
print(genre_sim.shape)
print(genre_sim[:2])



(4803, 4803)
[[1.         0.59628479 0.4472136  ... 0.         0.         0.        ]
 [0.59628479 1.         0.4        ... 0.         0.         0.        ]]

# 반환값은 np이지만 추출은 df을 써야하는 경우 => argsort
genre_sim_sorted_ind = genre_sim.argsort()[:, ::-1]
print(genre_sim_sorted_ind[:1])


# [[   0 3494  813 ... 3038 3037 2401]]

특정 영화와 장르별 유사도가 높은 영화를 반환하는 함수 생성

def find_sim_movie(df, sorted_ind, title_name, top_n=10):
    # df, 기준인덱스, 기준영화, 10개 추천영화, 10개 추천
    
    # 인자로 입력된 movies_df DataFrame에서 'title' 컬럼이 입력된 title_name 값인 DataFrame추출
    title_movie = df[df['title'] == title_name]
    
    # title_named을 가진 DataFrame의 index 객체를 ndarray로 반환하고 
    # sorted_ind 인자로 입력된 genre_sim_sorted_ind 객체에서 유사도 순으로 top_n 개의 index 추출
    title_index = title_movie.index.values
    similar_indexes = sorted_ind[title_index, :(top_n)]
    
    # 추출된 top_n index들 출력. top_n index는 2차원 데이터 임. 
    #dataframe에서 index로 사용하기 위해서 1차원 array로 변경
    print(similar_indexes) # 코사인유사도가 가장 높은 
    similar_indexes = similar_indexes.reshape(-1)
    
    return df.iloc[similar_indexes]

similar_movies = find_sim_movie(movies_df, genre_sim_sorted_ind, 'The Godfather',10)
similar_movies[['title', 'vote_average']]
# 장르만 같으니 goodfellas같은 영화가 뒤로 밀려남 


[[2731 1243 3636 1946 2640 4065 1847 4217  883 3866]]

title	vote_average
2731	The Godfather: Part II	8.3
1243	Mean Streets	7.2
3636	Light Sleeper	5.7
1946	The Bad Lieutenant: Port of Call - New Orleans	6.0
2640	Things to Do in Denver When You're Dead	6.7
4065	Mi America	0.0
1847	GoodFellas	8.2
4217	Kids	6.8
883	Catch Me If You Can	7.7
3866	City of God	8.1

평점이 높은 영화 정보 확인

movies_df[['title','vote_average','vote_count']].sort_values('vote_average', ascending=False)[:10]
# 평점수(votecount)가 낮으면 신뢰도가 떨어짐, vs shawshank redemption은 카운트도 높고 평점도 높고


title	vote_average	vote_count
3519	Stiff Upper Lips	10.0	1
4247	Me You and Five Bucks	10.0	2
4045	Dancer, Texas Pop. 81	10.0	1
4662	Little Big Top	10.0	1
3992	Sardaarji	9.5	2
2386	One Man's Hero	9.3	2
2970	There Goes My Baby	8.5	2
1881	The Shawshank Redemption	8.5	8205
2796	The Prisoner of Zenda	8.4	11
3337	The Godfather	8.4	5893

평가 횟수에 대한 가중치가 부여된 평점(Weighted Rating) 계산
가중 평점(Weighted Rating) = (v/(v+m)) * R + (m/(v+m)) * C

■ v: 개별 영화에 평점을 투표한 횟수 ■ m: 평점을 부여하기 위한 최소 투표 횟수 ■ R: 개별 영화에 대한 평균 평점. ■ C: 전체 영화에 대한 평균 평점

C = movies_df['vote_average'].mean()
m = movies_df['vote_count'].quantile(0.6)
print('C:',round(C,3), 'm:',round(m,3))


# C: 6.092 m: 370.2

percentile = 0.6
m = movies_df['vote_count'].quantile(percentile)
C = movies_df['vote_average'].mean()

def weighted_vote_average(record):
    v = record['vote_count']
    R = record['vote_average']
    
    return ( (v/(v+m)) * R ) + ( (m/(m+v)) * C )   

movies_df['weighted_vote'] = movies_df.apply(weighted_vote_average, axis=1)

movies_df[['title','vote_average','weighted_vote','vote_count']].sort_values('weighted_vote',
                                                                          ascending=False)[:10]
                                                                          
                                                                          
title	vote_average	weighted_vote	vote_count
1881	The Shawshank Redemption	8.5	8.396052	8205
3337	The Godfather	8.4	8.263591	5893
662	Fight Club	8.3	8.216455	9413
3232	Pulp Fiction	8.3	8.207102	8428
65	The Dark Knight	8.2	8.136930	12002
1818	Schindler's List	8.3	8.126069	4329
3865	Whiplash	8.3	8.123248	4254
809	Forrest Gump	8.2	8.105954	7927
2294	Spirited Away	8.3	8.105867	3840
2731	The Godfather: Part II	8.3	8.079586	3338

def find_sim_movie(df, sorted_ind, title_name, top_n=10):
    title_movie = df[df['title'] == title_name]
    title_index = title_movie.index.values
    
    # top_n의 2배에 해당하는 쟝르 유사성이 높은 index 추출 
    similar_indexes = sorted_ind[title_index, :(top_n*2)] # 20개
    similar_indexes = similar_indexes.reshape(-1)
    # 기준 영화 index는 제외
    similar_indexes = similar_indexes[similar_indexes != title_index]
    
    # top_n의 2배에 해당하는 후보군에서 weighted_vote 높은 순으로 top_n 만큼 추출 
    return df.iloc[similar_indexes].sort_values('weighted_vote', ascending=False)[:top_n]

similar_movies = find_sim_movie(movies_df, genre_sim_sorted_ind, 'The Godfather',10)
similar_movies[['title', 'vote_average', 'weighted_vote']]


	title	vote_average	weighted_vote
2731	The Godfather: Part II	8.3	8.079586
1847	GoodFellas	8.2	7.976937
3866	City of God	8.1	7.759693
1663	Once Upon a Time in America	8.2	7.657811
883	Catch Me If You Can	7.7	7.557097
281	American Gangster	7.4	7.141396
4041	This Is England	7.4	6.739664
1149	American Hustle	6.8	6.717525
1243	Mean Streets	7.2	6.626569
2839	Rounders	6.9	6.530427

데이터 전처리

from sklearn.linear_model import Ridge , LogisticRegression
from sklearn.model_selection import train_test_split , cross_val_score
from sklearn.feature_extraction.text import CountVectorizer , TfidfVectorizer
import pandas as pd

mercari_df= pd.read_csv('mercari_train.tsv',sep='\t')
print(mercari_df.shape)
mercari_df.head(3)



(1482535, 8)
train_id	name	item_condition_id	category_name	brand_name	price	shipping	item_description
0	0	MLB Cincinnati Reds T Shirt Size XL	3	Men/Tops/T-shirts	NaN	10.0	1	No description yet
1	1	Razer BlackWidow Chroma Keyboard	3	Electronics/Computers & Tablets/Components & P...	Razer	52.0	0	This keyboard is in great condition and works ...
2	2	AVA-VIV Blouse	1	Women/Tops & Blouses/Blouse	Target	10.0	1	Adorable top with a hint of lace and a key hol...

• train_id: 데이터 id
• name: 제품명
• item_condition_id: 판매자가 제공하는 제품 상태
• category_name: 카테고리 명
• brand_name: 브랜드 이름
• price: 제품 가격. 예측을 위한 타깃 속성
• shipping: 배송비 무료 여부. 1이면 무료(판매자가 지불), 0이면 유료(구매자 지불)
• item_description: 제품에 대한 설명

print(mercari_df.info())




<class 'pandas.core.frame.DataFrame'>
RangeIndex: 1482535 entries, 0 to 1482534
Data columns (total 8 columns):
 #   Column             Non-Null Count    Dtype  
---  ------             --------------    -----  
 0   train_id           1482535 non-null  int64  
 1   name               1482535 non-null  object 
 2   item_condition_id  1482535 non-null  int64  
 3   category_name      1476208 non-null  object 
 4   brand_name         849853 non-null   object 
 5   price              1482535 non-null  float64
 6   shipping           1482535 non-null  int64  
 7   item_description   1482531 non-null  object 
dtypes: float64(1), int64(3), object(4)
memory usage: 90.5+ MB
None

타겟값의 분포도 확인

import matplotlib.pyplot as plt
import seaborn as sns
%matplotlib inline

y_train_df = mercari_df['price']
plt.figure(figsize=(6,4))
sns.distplot(y_train_df,kde=False)

타겟값 로그 변환 후 분포도 확인

import numpy as np

y_train_df = np.log1p(y_train_df)
sns.distplot(y_train_df,kde=False)

mercari_df['price'] = np.log1p(mercari_df['price'])
mercari_df['price'].head(3)


0    2.397895
1    3.970292
2    2.397895
Name: price, dtype: float64

각 피처들의 유형 살펴보기

print('Shipping 값 유형:\n',mercari_df['shipping'].value_counts())
print('item_condition_id 값 유형:\n',mercari_df['item_condition_id'].value_counts())



Shipping 값 유형:
 0    819435
1    663100
Name: shipping, dtype: int64
item_condition_id 값 유형:
 1    640549
3    432161
2    375479
4     31962
5      2384
Name: item_condition_id, dtype: int64

boolean_cond= mercari_df['item_description']=='No description yet'
mercari_df[boolean_cond]['item_description'].count()


# 82489

category name이 대/중/소 와 같이 '/' 문자열 기반으로 되어 있음. 이를 개별 컬럼들로 재 생성

# apply lambda에서 호출되는 대,중,소 분할 함수 생성, 대,중,소 값을 리스트 반환
def split_cat(category_name):
    try:
        return category_name.split('/')
    except:
        return ['Other_Null' , 'Other_Null' , 'Other_Null']

# 위의 split_cat( )을 apply lambda에서 호출하여 대,중,소 컬럼을 mercari_df에 생성. 
mercari_df['cat_dae'], mercari_df['cat_jung'], mercari_df['cat_so'] = \
                        zip(*mercari_df['category_name'].apply(lambda x : split_cat(x)))

# 대분류만 값의 유형과 건수를 살펴보고, 중분류, 소분류는 값의 유형이 많으므로 분류 갯수만 추출
print('대분류 유형 :\n', mercari_df['cat_dae'].value_counts())
print('중분류 갯수 :', mercari_df['cat_jung'].nunique())
print('소분류 갯수 :', mercari_df['cat_so'].nunique())




대분류 유형 :
 Women                     664385
Beauty                    207828
Kids                      171689
Electronics               122690
Men                        93680
Home                       67871
Vintage & Collectibles     46530
Other                      45351
Handmade                   30842
Sports & Outdoors          25342
Other_Null                  6327
Name: cat_dae, dtype: int64
중분류 갯수 : 114
소분류 갯수 : 871

'test1/test2/test3'.split('/')


# ['test1', 'test2', 'test3']

# apply lambda에서 호출되는 대,중,소 분할 함수 생성, 대,중,소 값을 리스트 반환
def split_cat(category_name):
    try:
        return category_name.split('/')
    except:
        return ['Other_Null' , 'Other_Null' , 'Other_Null']

# 위의 split_cat( )을 apply lambda에서 호출하여 대,중,소 컬럼을 mercari_df에 생성. 
mercari_df['category_list'] = mercari_df['category_name'].apply(lambda x : split_cat(x))
mercari_df['category_list'].head()


0                                [Men, Tops, T-shirts]
1    [Electronics, Computers & Tablets, Components ...
2                      [Women, Tops & Blouses, Blouse]
3               [Home, Home Décor, Home Décor Accents]
4                          [Women, Jewelry, Necklaces]
Name: category_list, dtype: object

mercari_df['cat_dae'] = mercari_df['category_list'].apply(lambda x:x[0])
mercari_df['cat_jung'] = mercari_df['category_list'].apply(lambda x:x[1])
mercari_df['cat_so'] = mercari_df['category_list'].apply(lambda x:x[2])

mercari_df.drop('category_list', axis=1, inplace=True)

mercari_df[['cat_dae','cat_jung','cat_so']].head()


	cat_dae	cat_jung	cat_so
0	Men	Tops	T-shirts
1	Electronics	Computers & Tablets	Components & Parts
2	Women	Tops & Blouses	Blouse
3	Home	Home Décor	Home Décor Accents
4	Women	Jewelry	Necklaces

Null값 일괄 처리

mercari_df['brand_name'] = mercari_df['brand_name'].fillna(value='Other_Null')
mercari_df['category_name'] = mercari_df['category_name'].fillna(value='Other_Null')
mercari_df['item_description'] = mercari_df['item_description'].fillna(value='Other_Null')

# 각 컬럼별로 Null값 건수 확인. 모두 0가 나와야 합니다.
mercari_df.isnull().sum()



train_id             0
name                 0
item_condition_id    0
category_name        0
brand_name           0
price                0
shipping             0
item_description     0
cat_dae              0
cat_jung             0
cat_so               0
dtype: int64

mercari_df.info()


<class 'pandas.core.frame.DataFrame'>
RangeIndex: 1482535 entries, 0 to 1482534
Data columns (total 11 columns):
 #   Column             Non-Null Count    Dtype  
---  ------             --------------    -----  
 0   train_id           1482535 non-null  int64  
 1   name               1482535 non-null  object 
 2   item_condition_id  1482535 non-null  int64  
 3   category_name      1482535 non-null  object 
 4   brand_name         1482535 non-null  object 
 5   price              1482535 non-null  float64
 6   shipping           1482535 non-null  int64  
 7   item_description   1482535 non-null  object 
 8   cat_dae            1482535 non-null  object 
 9   cat_jung           1482535 non-null  object 
 10  cat_so             1482535 non-null  object 
dtypes: float64(1), int64(3), object(7)
memory usage: 124.4+ MB

print('brand name 의 유형 건수 :', mercari_df['brand_name'].nunique())
print('brand name sample 5건 : \n', mercari_df['brand_name'].value_counts()[:5])


brand name 의 유형 건수 : 4810
brand name sample 5건 : 
 Other_Null           632682
PINK                  54088
Nike                  54043
Victoria's Secret     48036
LuLaRoe               31024
Name: brand_name, dtype: int64

print('name 의 종류 갯수 :', mercari_df['name'].nunique())
print('name sample 7건 : \n', mercari_df['name'][:7])


name 의 종류 갯수 : 1225273
name sample 7건 : 
 0    MLB Cincinnati Reds T Shirt Size XL
1       Razer BlackWidow Chroma Keyboard
2                         AVA-VIV Blouse
3                  Leather Horse Statues
4                   24K GOLD plated rose
5       Bundled items requested for Ruie
6     Acacia pacific tides santorini top
Name: name, dtype: object

item_description의 문자열 개수 확인

pd.set_option('max_colwidth', 200)

# item_description의 평균 문자열 개수
print('item_description 평균 문자열 개수:',mercari_df['item_description'].str.len().mean())

mercari_df['item_description'][:2]



item_description 평균 문자열 개수: 145.7113889385411
0                                                                                                                                                                              No description yet
1    This keyboard is in great condition and works like it came out of the box. All of the ports are tested and work perfectly. The lights are customizable via the Razer Synapse app on your PC.
Name: item_description, dtype: object

import gc
gc.collect()



# 120

name은 Count로, item_description은 TF-IDF로 피처 벡터화

# name 속성에 대한 feature vectorization 변환
cnt_vec = CountVectorizer(max_features=30000)
X_name = cnt_vec.fit_transform(mercari_df.name)

# item_description 에 대한 feature vectorization 변환 
tfidf_descp = TfidfVectorizer(max_features = 50000, ngram_range= (1,3) , stop_words='english')
X_descp = tfidf_descp.fit_transform(mercari_df['item_description'])

print('name vectorization shape:',X_name.shape)
print('item_description vectorization shape:',X_descp.shape)



name vectorization shape: (1482535, 30000)
item_description vectorization shape: (1482535, 50000)

사이킷런의 LabelBinarizer를 이용하여 원-핫 인코딩 변환 후 희소행렬 최적화 형태로 저장

from sklearn.preprocessing import LabelBinarizer

# brand_name, item_condition_id, shipping 각 피처들을 희소 행렬 원-핫 인코딩 변환
lb_brand_name= LabelBinarizer(sparse_output=True)
X_brand = lb_brand_name.fit_transform(mercari_df['brand_name'])

lb_item_cond_id = LabelBinarizer(sparse_output=True)
X_item_cond_id = lb_item_cond_id.fit_transform(mercari_df['item_condition_id'])

lb_shipping= LabelBinarizer(sparse_output=True)
X_shipping = lb_shipping.fit_transform(mercari_df['shipping'])

# cat_dae, cat_jung, cat_so 각 피처들을 희소 행렬 원-핫 인코딩 변환
lb_cat_dae = LabelBinarizer(sparse_output=True)
X_cat_dae= lb_cat_dae.fit_transform(mercari_df['cat_dae'])

lb_cat_jung = LabelBinarizer(sparse_output=True)
X_cat_jung = lb_cat_jung.fit_transform(mercari_df['cat_jung'])

lb_cat_so = LabelBinarizer(sparse_output=True)
X_cat_so = lb_cat_so.fit_transform(mercari_df['cat_so'])

print(type(X_brand), type(X_item_cond_id), type(X_shipping))
print('X_brand_shape:{0}, X_item_cond_id shape:{1}'.format(X_brand.shape, X_item_cond_id.shape))
print('X_shipping shape:{0}, X_cat_dae shape:{1}'.format(X_shipping.shape, X_cat_dae.shape))
print('X_cat_jung shape:{0}, X_cat_so shape:{1}'.format(X_cat_jung.shape, X_cat_so.shape))



<class 'scipy.sparse.csr.csr_matrix'> <class 'scipy.sparse.csr.csr_matrix'> <class 'scipy.sparse.csr.csr_matrix'>
X_brand_shape:(1482535, 4810), X_item_cond_id shape:(1482535, 5)
X_shipping shape:(1482535, 1), X_cat_dae shape:(1482535, 11)
X_cat_jung shape:(1482535, 114), X_cat_so shape:(1482535, 871)

import gc
gc.collect()


# 60

피처 벡터화된 희소 행렬과 원-핫 인코딩된 희소 행렬을 모두 scipy 패키지의 hstack()함수를 이용하여 결합

from  scipy.sparse import hstack
import gc

sparse_matrix_list = (X_name, X_descp, X_brand, X_item_cond_id,
            X_shipping, X_cat_dae, X_cat_jung, X_cat_so)

# 사이파이 sparse 모듈의 hstack 함수를 이용하여 앞에서 인코딩과 Vectorization을 수행한 데이터 셋을 모두 결합. 
X_features_sparse= hstack(sparse_matrix_list).tocsr()
print(type(X_features_sparse), X_features_sparse.shape)

# 데이터 셋이 메모리를 많이 차지하므로 사용 용도가 끝났으면 바로 메모리에서 삭제. 
del X_features_sparse
gc.collect()



<class 'scipy.sparse.csr.csr_matrix'> (1482535, 85812)
20

def rmsle(y , y_pred):
    # underflow, overflow를 막기 위해 log가 아닌 log1p로 rmsle 계산 
    return np.sqrt(np.mean(np.power(np.log1p(y) - np.log1p(y_pred), 2)))

def evaluate_org_price(y_test , preds): 
    
    # 원본 데이터는 log1p로 변환되었으므로 exmpm1으로 원복 필요. 
    preds_exmpm = np.expm1(preds)
    y_test_exmpm = np.expm1(y_test)
    
    # rmsle로 RMSLE 값 추출
    rmsle_result = rmsle(y_test_exmpm, preds_exmpm)
    return rmsle_result

여러 모델에 대한 학습/예측을 수행하기 위해 별도의 함수인 model_train_predict()생성.

해당 함수는 여러 희소 행렬을 hstack()으로 결합한 뒤 학습과 테스트 데이터 세트로 분할 후 모델 학습 및 예측을 수행

import gc 
from  scipy.sparse import hstack

def model_train_predict(model,matrix_list):
    # scipy.sparse 모듈의 hstack 을 이용하여 sparse matrix 결합
    X= hstack(matrix_list).tocsr()     
    
    X_train, X_test, y_train, y_test=train_test_split(X, mercari_df['price'], 
                                                      test_size=0.2, random_state=156)
    
    # 모델 학습 및 예측
    model.fit(X_train , y_train)
    preds = model.predict(X_test)
    
    del X , X_train , X_test , y_train 
    gc.collect()
    
    return preds , y_test

릿지 선형 회귀로 학습/예측/평가. Item Description 피처의 영향도를 알아보기 위한 테스트 함께 수행

linear_model = Ridge(solver = "lsqr", fit_intercept=False)

sparse_matrix_list = (X_name, X_brand, X_item_cond_id,
                      X_shipping, X_cat_dae, X_cat_jung, X_cat_so)
linear_preds , y_test = model_train_predict(model=linear_model ,matrix_list=sparse_matrix_list)
print('Item Description을 제외했을 때 rmsle 값:', evaluate_org_price(y_test , linear_preds))

sparse_matrix_list = (X_descp, X_name, X_brand, X_item_cond_id,
                      X_shipping, X_cat_dae, X_cat_jung, X_cat_so)
linear_preds , y_test = model_train_predict(model=linear_model , matrix_list=sparse_matrix_list)
print('Item Description을 포함한 rmsle 값:',  evaluate_org_price(y_test ,linear_preds))




Item Description을 제외했을 때 rmsle 값: 0.5033966209740147
Item Description을 포함한 rmsle 값: 0.4711962436444673

import gc
gc.collect()


# 20

LightGBM 회귀 모델 구축과 앙상블을 이용한 최종 예측 평가

from lightgbm import LGBMRegressor

sparse_matrix_list = (X_descp, X_name, X_brand, X_item_cond_id,
                      X_shipping, X_cat_dae, X_cat_jung, X_cat_so)

lgbm_model = LGBMRegressor(n_estimators=200, learning_rate=0.5, num_leaves=125, random_state=156)
lgbm_preds , y_test = model_train_predict(model = lgbm_model , matrix_list=sparse_matrix_list)
print('LightGBM rmsle 값:',  evaluate_org_price(y_test , lgbm_preds))

LightGBM rmsle 값: 0.45730550903834194

preds = lgbm_preds * 0.45 + linear_preds * 0.55
print('LightGBM과 Ridge를 ensemble한 최종 rmsle 값:',  evaluate_org_price(y_test , preds))



LightGBM과 Ridge를 ensemble한 최종 rmsle 값: 0.4509289243473559

한글 텍스트 처리 _ 네이버 영화 평점 감성 분석

import pandas as pd

train_df = pd.read_csv('ratings_train.txt', sep='\t')
train_df.head(3)



	id	document	label
0	9976970	아 더빙.. 진짜 짜증나네요 목소리	0
1	3819312	흠...포스터보고 초딩영화줄....오버연기조차 가볍지 않구나	1
2	10265843	너무재밓었다그래서보는것을추천한다	0

train_df['label'].value_counts( )

0    75173
1    74827
Name: label, dtype: int64

train_df.info()



<class 'pandas.core.frame.DataFrame'>
RangeIndex: 150000 entries, 0 to 149999
Data columns (total 3 columns):
id          150000 non-null int64
document    149995 non-null object
label       150000 non-null int64
dtypes: int64(2), object(1)
memory usage: 3.4+ MB

import re

train_df = train_df.fillna(' ')
# 정규 표현식을 이용하여 숫자를 공백으로 변경(정규 표현식으로 \d 는 숫자를 의미함.) 
train_df['document'] = train_df['document'].apply( lambda x : re.sub(r"\d+", " ", x) )
train_df.drop('id', axis=1, inplace=True)

# 테스트 데이터 셋을 로딩하고 동일하게 Null 및 숫자를 공백으로 변환
test_df = pd.read_csv('ratings_test.txt', sep='\t')
test_df = test_df.fillna(' ')
test_df['document'] = test_df['document'].apply( lambda x : re.sub(r"\d+", " ", x) )
test_df.drop('id', axis=1, inplace=True)

from konlpy.tag import Twitter

twitter = Twitter()
def tw_tokenizer(text):
    # 입력 인자로 들어온 text 를 형태소 단어로 토큰화 하여 list 객체 반환
    tokens_ko = twitter.morphs(text)
    return tokens_ko

tw_tokenizer('첫째')




# ['첫째']

from sklearn.feature_extraction.text import TfidfVectorizer
from sklearn.linear_model import LogisticRegression
from sklearn.model_selection import GridSearchCV

# Twitter 객체의 morphs( ) 객체를 이용한 tokenizer를 사용. ngram_range는 (1,2) 
tfidf_vect = TfidfVectorizer(tokenizer=tw_tokenizer, ngram_range=(1,2), min_df=3, max_df=0.9)
tfidf_vect.fit(train_df['document'])
tfidf_matrix_train = tfidf_vect.transform(train_df['document'])

# Logistic Regression 을 이용하여 감성 분석 Classification 수행. 
lg_clf = LogisticRegression(random_state=0)

# Parameter C 최적화를 위해 GridSearchCV 를 이용. 
params = { 'C': [1 ,3.5, 4.5, 5.5, 10 ] }
grid_cv = GridSearchCV(lg_clf , param_grid=params , cv=3 ,scoring='accuracy', verbose=1 )
grid_cv.fit(tfidf_matrix_train , train_df['label'] )
print(grid_cv.best_params_ , round(grid_cv.best_score_,4))


# {'C': 3.5} 0.8593

from sklearn.metrics import accuracy_score

# 학습 데이터를 적용한 TfidfVectorizer를 이용하여 테스트 데이터를 TF-IDF 값으로 Feature 변환함. 
tfidf_matrix_test = tfidf_vect.transform(test_df['document'])

# classifier 는 GridSearchCV에서 최적 파라미터로 학습된 classifier를 그대로 이용
best_estimator = grid_cv.best_estimator_
preds = best_estimator.predict(tfidf_matrix_test)

print('Logistic Regression 정확도: ',accuracy_score(test_df['label'],preds))


# Logistic Regression 정확도:  0.86172

Opinion Review 데이터 세트를 이용한 문서 군집화 수행하기

데이터 로딩

import pandas as pd
import glob ,os

# 아래는 제 컴퓨터에서 압축 파일을 풀어 놓은 디렉토리이니, 여러분의 디렉토리를 설정해 주십시요  
path = r'C:\Users\pc\Machine Learning P Guide\data\OpinosisDataset1.0\OpinosisDataset1.0\topics'                     
# path로 지정한 디렉토리 밑에 있는 모든 .data 파일들의 파일명을 리스트로 취합
all_files = glob.glob(os.path.join(path, "*.data"))    
filename_list = []
opinion_text = []

# 개별 파일들의 파일명은 filename_list 리스트로 취합, 
# 개별 파일들의 파일내용은 DataFrame로딩 후 다시 string으로 변환하여 opinion_text 리스트로 취합 
for file_ in all_files:
    # 개별 파일을 읽어서 DataFrame으로 생성 
    df = pd.read_table(file_,index_col=None, header=0,encoding='latin1')
    
    # 절대경로로 주어진 file 명을 가공. 만일 Linux에서 수행시에는 아래 \\를 / 변경. 맨 마지막 .data 확장자도 제거
    filename_ = file_.split('\\')[-1]
    filename = filename_.split('.')[0]

    #파일명 리스트와 파일내용 리스트에 파일명과 파일 내용을 추가. 
    filename_list.append(filename)
    opinion_text.append(df.to_string())

# 파일명 리스트와 파일내용 리스트를  DataFrame으로 생성
document_df = pd.DataFrame({'filename':filename_list, 'opinion_text':opinion_text})
document_df.head()


filename	opinion_text
0	accuracy_garmin_nuvi_255W_gps	, and is very, very acc...
1	bathroom_bestwestern_hotel_sfo	The room was not overly big, but clean and...
2	battery-life_amazon_kindle	After I plugged it in to my USB hub on my ...
3	battery-life_ipod_nano_8gb	short battery life I moved up from a...
4	battery-life_netbook_1005ha	6GHz 533FSB cpu, glossy display, 3, Cell 2...

Lemmatization을 위한 함수 생성

from nltk.stem import WordNetLemmatizer
import nltk
import string

# nltk는 
remove_punct_dict = dict((ord(punct), None) for punct in string.punctuation)
lemmar = WordNetLemmatizer()

def LemTokens(tokens):
    return [lemmar.lemmatize(token) for token in tokens]

def LemNormalize(text):
    return LemTokens(nltk.word_tokenize(text.lower().translate(remove_punct_dict)))

TF-IDF 피처 벡터화, TfidfVectorizer에서 피처 벡터화 수행 시 Lemmatization을 적용하여 토큰화

from sklearn.feature_extraction.text import TfidfVectorizer

tfidf_vect = TfidfVectorizer(tokenizer=LemNormalize, stop_words='english' , \
                             ngram_range=(1,2), min_df=0.05, max_df=0.85 )

#opinion_text 컬럼값으로 feature vectorization 수행
feature_vect = tfidf_vect.fit_transform(document_df['opinion_text'])

5개의 군집으로 K-Means군집화

from sklearn.cluster import KMeans

# 5개 집합으로 군집화 수행. 예제를 위해 동일한 클러스터링 결과 도출용 random_state=0 
km_cluster = KMeans(n_clusters=5, max_iter=10000, random_state=0)
km_cluster.fit(feature_vect)
cluster_label = km_cluster.labels_
cluster_centers = km_cluster.cluster_centers_

군집화된 그룹별로 데이터 확인

document_df['cluster_label'] = cluster_label
document_df.head()


filename	opinion_text	cluster_label
0	accuracy_garmin_nuvi_255W_gps	, and is very, very acc...	2
1	bathroom_bestwestern_hotel_sfo	The room was not overly big, but clean and...	0
2	battery-life_amazon_kindle	After I plugged it in to my USB hub on my ...	1
3	battery-life_ipod_nano_8gb	short battery life I moved up from a...	1
4	battery-life_netbook_1005ha	6GHz 533FSB cpu, glossy display, 3, Cell 2...	1

document_df[document_df['cluster_label']==0].sort_values(by='filename')

filename	opinion_text	cluster_label
1	bathroom_bestwestern_hotel_sfo	The room was not overly big, but clean and...	0
32	room_holiday_inn_london	We arrived at 23,30 hours and they could n...	0
30	rooms_bestwestern_hotel_sfo	Great Location , Nice Rooms , Helpless...	0
31	rooms_swissotel_chicago	The Swissotel is one of our favorite hotel...	0

document_df[document_df['cluster_label']==1].sort_values(by='filename')


filename	opinion_text	cluster_label
2	battery-life_amazon_kindle	After I plugged it in to my USB hub on my ...	1
3	battery-life_ipod_nano_8gb	short battery life I moved up from a...	1
4	battery-life_netbook_1005ha	6GHz 533FSB cpu, glossy display, 3, Cell 2...	1
19	keyboard_netbook_1005ha	, I think the new keyboard rivals the gre...	1
26	performance_netbook_1005ha	The Eee Super Hybrid Engine utility lets u...	1
42	sound_ipod_nano_8gb	headphone jack i got a clear case for it a...	1
44	speed_windows7	Windows 7 is quite simply faster, more sta...	1

document_df[document_df['cluster_label']==2].sort_values(by='filename')

filename	opinion_text	cluster_label
0	accuracy_garmin_nuvi_255W_gps	, and is very, very acc...	2
5	buttons_amazon_kindle	I thought it would be fitting to christen ...	2
8	directions_garmin_nuvi_255W_gps	You also get upscale features like spoken ...	2
9	display_garmin_nuvi_255W_gps	3 quot widescreen display was a ...	2
10	eyesight-issues_amazon_kindle	It feels as easy to read as the K1 but doe...	2
11	features_windows7	I had to uninstall anti, virus and selecte...	2
12	fonts_amazon_kindle	Being able to change the font sizes is aw...	2
23	navigation_amazon_kindle	In fact, the entire navigation structure h...	2
33	satellite_garmin_nuvi_255W_gps	It's fast to acquire satel...	2
34	screen_garmin_nuvi_255W_gps	It is easy to read and when touching the...	2
35	screen_ipod_nano_8gb	As always, the video screen is sharp and b...	2
36	screen_netbook_1005ha	Keep in mind that once you get in a room ...	2
41	size_asus_netbook_1005ha	A few other things I'd like to point out i...	2
43	speed_garmin_nuvi_255W_gps	Another feature on the 255w is a display of...	2
48	updates_garmin_nuvi_255W_gps	Another thing to consider was that I paid $...	2
49	video_ipod_nano_8gb	I bought the 8, gig Ipod Nano that has the...	2
50	voice_garmin_nuvi_255W_gps	The voice prompts and maps are wonderful ...	2

document_df[document_df['cluster_label']==3].sort_values(by='filename')

filename	opinion_text	cluster_label
13	food_holiday_inn_london	The room was packed to capacity with queu...	3
14	food_swissotel_chicago	The food for our event was deli...	3
15	free_bestwestern_hotel_sfo	The wine reception is a great idea as it i...	3
20	location_bestwestern_hotel_sfo	Good Value good location , ideal ...	3
21	location_holiday_inn_london	Great location for tube and we crammed in...	3
24	parking_bestwestern_hotel_sfo	Parking was expensive but I think this is ...	3
27	price_amazon_kindle	If a case was included, as with the Kindle...	3
28	price_holiday_inn_london	All in all, a normal chain hotel on a nice...	3
38	service_bestwestern_hotel_sfo	Both of us having worked in tourism for o...	3
39	service_holiday_inn_london	not customer, oriented hotelvery low servi...	3
40	service_swissotel_hotel_chicago	Mediocre room and service for a very extr...	3
45	staff_bestwestern_hotel_sfo	Staff are friendly and hel...	3
46	staff_swissotel_chicago	The staff at Swissotel were not particula...	3

document_df[document_df['cluster_label']==4].sort_values(by='filename')


filename	opinion_text	cluster_label
6	comfort_honda_accord_2008	Drivers seat not comfortable, the car its...	4
7	comfort_toyota_camry_2007	Ride seems comfortable and gas mileage fa...	4
16	gas_mileage_toyota_camry_2007	Ride seems comfortable and gas mileage fa...	4
17	interior_honda_accord_2008	I love the new body style and the interior...	4
18	interior_toyota_camry_2007	First of all, the interior has way too ma...	4
22	mileage_honda_accord_2008	It's quiet, get good gas mileage and look...	4
25	performance_honda_accord_2008	Very happy with my 08 Accord, performance i...	4
29	quality_toyota_camry_2007	I previously owned a Toyota 4Runner which ...	4
37	seats_honda_accord_2008	Front seats are very uncomfor...	4
47	transmission_toyota_camry_2007	After slowing down, transmission has to b...	4

from sklearn.cluster import KMeans

# 3개의 집합으로 군집화 
km_cluster = KMeans(n_clusters=3, max_iter=10000, random_state=0)
km_cluster.fit(feature_vect)
cluster_label = km_cluster.labels_


# 소속 클러스터를 cluster_label 컬럼으로 할당하고 cluster_label 값으로 정렬
document_df['cluster_label'] = cluster_label
document_df.sort_values(by='cluster_label')

filename	opinion_text	cluster_label
0	accuracy_garmin_nuvi_255W_gps	, and is very, very acc...	0
48	updates_garmin_nuvi_255W_gps	Another thing to consider was that I paid $...	0
44	speed_windows7	Windows 7 is quite simply faster, more sta...	0
43	speed_garmin_nuvi_255W_gps	Another feature on the 255w is a display of...	0
42	sound_ipod_nano_8gb	headphone jack i got a clear case for it a...	0
41	size_asus_netbook_1005ha	A few other things I'd like to point out i...	0
36	screen_netbook_1005ha	Keep in mind that once you get in a room ...	0
35	screen_ipod_nano_8gb	As always, the video screen is sharp and b...	0
34	screen_garmin_nuvi_255W_gps	It is easy to read and when touching the...	0
33	satellite_garmin_nuvi_255W_gps	It's fast to acquire satel...	0
27	price_amazon_kindle	If a case was included, as with the Kindle...	0
26	performance_netbook_1005ha	The Eee Super Hybrid Engine utility lets u...	0
49	video_ipod_nano_8gb	I bought the 8, gig Ipod Nano that has the...	0
23	navigation_amazon_kindle	In fact, the entire navigation structure h...	0
19	keyboard_netbook_1005ha	, I think the new keyboard rivals the gre...	0
50	voice_garmin_nuvi_255W_gps	The voice prompts and maps are wonderful ...	0
9	display_garmin_nuvi_255W_gps	3 quot widescreen display was a ...	0
4	battery-life_netbook_1005ha	6GHz 533FSB cpu, glossy display, 3, Cell 2...	0
3	battery-life_ipod_nano_8gb	short battery life I moved up from a...	0
2	battery-life_amazon_kindle	After I plugged it in to my USB hub on my ...	0
8	directions_garmin_nuvi_255W_gps	You also get upscale features like spoken ...	0
10	eyesight-issues_amazon_kindle	It feels as easy to read as the K1 but doe...	0
11	features_windows7	I had to uninstall anti, virus and selecte...	0
12	fonts_amazon_kindle	Being able to change the font sizes is aw...	0
5	buttons_amazon_kindle	I thought it would be fitting to christen ...	0
13	food_holiday_inn_london	The room was packed to capacity with queu...	1
39	service_holiday_inn_london	not customer, oriented hotelvery low servi...	1
38	service_bestwestern_hotel_sfo	Both of us having worked in tourism for o...	1
1	bathroom_bestwestern_hotel_sfo	The room was not overly big, but clean and...	1
14	food_swissotel_chicago	The food for our event was deli...	1
20	location_bestwestern_hotel_sfo	Good Value good location , ideal ...	1
24	parking_bestwestern_hotel_sfo	Parking was expensive but I think this is ...	1
15	free_bestwestern_hotel_sfo	The wine reception is a great idea as it i...	1
31	rooms_swissotel_chicago	The Swissotel is one of our favorite hotel...	1
30	rooms_bestwestern_hotel_sfo	Great Location , Nice Rooms , Helpless...	1
45	staff_bestwestern_hotel_sfo	Staff are friendly and hel...	1
40	service_swissotel_hotel_chicago	Mediocre room and service for a very extr...	1
21	location_holiday_inn_london	Great location for tube and we crammed in...	1
46	staff_swissotel_chicago	The staff at Swissotel were not particula...	1
32	room_holiday_inn_london	We arrived at 23,30 hours and they could n...	1
28	price_holiday_inn_london	All in all, a normal chain hotel on a nice...	1
47	transmission_toyota_camry_2007	After slowing down, transmission has to b...	2
16	gas_mileage_toyota_camry_2007	Ride seems comfortable and gas mileage fa...	2
6	comfort_honda_accord_2008	Drivers seat not comfortable, the car its...	2
7	comfort_toyota_camry_2007	Ride seems comfortable and gas mileage fa...	2
29	quality_toyota_camry_2007	I previously owned a Toyota 4Runner which ...	2
22	mileage_honda_accord_2008	It's quiet, get good gas mileage and look...	2
18	interior_toyota_camry_2007	First of all, the interior has way too ma...	2
17	interior_honda_accord_2008	I love the new body style and the interior...	2
37	seats_honda_accord_2008	Front seats are very uncomfor...	2
25	performance_honda_accord_2008	Very happy with my 08 Accord, performance i...	2

군집(Cluster)별 핵심 단어 추출하기

feature_vect.shape

KMeans객체의 cluster_centers_ 속성은 개별 피처들의 클러스터 중심과의 상대 위치를 정규화된 숫자값으로 표시

0~1까지의 값으로 표현되며 1에 가까울 수록 중심에 더 가깝다는 의미

cluster_centers = km_cluster.cluster_centers_
print('cluster_centers shape :',cluster_centers.shape)
print(cluster_centers)

cluster_centers shape : (3, 2409)
[[0.01819865 0.         0.         ... 0.         0.         0.00471073]
 [0.         0.00170335 0.0025537  ... 0.0032582  0.00349413 0.        ]
 [0.         0.00137309 0.         ... 0.         0.         0.        ]]

군집별 top n 핵심단어, 그 단어의 중심 위치 상대값, 대상 파일명들을 반환하는 함수 생성

# 군집별 top n 핵심단어, 그 단어의 중심 위치 상대값, 대상 파일명들을 반환함. 
def get_cluster_details(cluster_model, cluster_data, feature_names, clusters_num, top_n_features=10):
    cluster_details = {}
    
    # cluster_centers array 의 값이 큰 순으로 정렬된 index 값을 반환
    # 군집 중심점(centroid)별 할당된 word 피처들의 거리값이 큰 순으로 값을 구하기 위함.  
    centroid_feature_ordered_ind = cluster_model.cluster_centers_.argsort()[:,::-1]
    
    #개별 군집별로 iteration하면서 핵심단어, 그 단어의 중심 위치 상대값, 대상 파일명 입력
    for cluster_num in range(clusters_num):
        # 개별 군집별 정보를 담을 데이터 초기화. 
        cluster_details[cluster_num] = {}
        cluster_details[cluster_num]['cluster'] = cluster_num
        
        # cluster_centers_.argsort()[:,::-1] 로 구한 index 를 이용하여 top n 피처 단어를 구함. 
        top_feature_indexes = centroid_feature_ordered_ind[cluster_num, :top_n_features]
        top_features = [ feature_names[ind] for ind in top_feature_indexes ]
        
        # top_feature_indexes를 이용해 해당 피처 단어의 중심 위치 상댓값 구함 
        top_feature_values = cluster_model.cluster_centers_[cluster_num, top_feature_indexes].tolist()
        
        # cluster_details 딕셔너리 객체에 개별 군집별 핵심 단어와 중심위치 상대값, 그리고 해당 파일명 입력
        cluster_details[cluster_num]['top_features'] = top_features
        cluster_details[cluster_num]['top_features_value'] = top_feature_values
        filenames = cluster_data[cluster_data['cluster_label'] == cluster_num]['filename']
        filenames = filenames.values.tolist()
        cluster_details[cluster_num]['filenames'] = filenames
        
    return cluster_details

클러스터별 top feature들의 단어와 파일명 출력``

def print_cluster_details(cluster_details):
    for cluster_num, cluster_detail in cluster_details.items():
        print('####### Cluster {0}'.format(cluster_num))
        print('Top features:', cluster_detail['top_features'])
        print('Reviews 파일명 :',cluster_detail['filenames'][:7])
        print('==================================================')

feature_names = tfidf_vect.get_feature_names()

cluster_details = get_cluster_details(cluster_model=km_cluster, cluster_data=document_df,\
                                  feature_names=feature_names, clusters_num=3, top_n_features=10 )
print_cluster_details(cluster_details)


####### Cluster 0
Top features: ['screen', 'battery', 'life', 'battery life', 'keyboard', 'kindle', 'size', 'button', 'easy', 'voice']
Reviews 파일명 : ['accuracy_garmin_nuvi_255W_gps', 'battery-life_amazon_kindle', 'battery-life_ipod_nano_8gb', 'battery-life_netbook_1005ha', 'buttons_amazon_kindle', 'directions_garmin_nuvi_255W_gps', 'display_garmin_nuvi_255W_gps']
==================================================
####### Cluster 1
Top features: ['room', 'hotel', 'service', 'location', 'staff', 'food', 'clean', 'bathroom', 'parking', 'room wa']
Reviews 파일명 : ['bathroom_bestwestern_hotel_sfo', 'food_holiday_inn_london', 'food_swissotel_chicago', 'free_bestwestern_hotel_sfo', 'location_bestwestern_hotel_sfo', 'location_holiday_inn_london', 'parking_bestwestern_hotel_sfo']
==================================================
####### Cluster 2
Top features: ['interior', 'seat', 'mileage', 'comfortable', 'car', 'gas', 'transmission', 'gas mileage', 'ride', 'comfort']
Reviews 파일명 : ['comfort_honda_accord_2008', 'comfort_toyota_camry_2007', 'gas_mileage_toyota_camry_2007', 'interior_honda_accord_2008', 'interior_toyota_camry_2007', 'mileage_honda_accord_2008', 'performance_honda_accord_2008']
==================================================

20 Newsgroup 토픽 모델링

20개 중 8개의 주제 데이터 로드 및 Count기반 피처 벡터화. LDA는 Count기반 Vectorizer만 적용합니다

from sklearn.datasets import fetch_20newsgroups
from sklearn.feature_extraction.text import CountVectorizer
from sklearn.decomposition import LatentDirichletAllocation

# 모토사이클, 야구, 그래픽스, 윈도우즈, 중동, 기독교, 전자공학, 의학 등 8개 주제를 추출. 
cats = ['rec.motorcycles', 'rec.sport.baseball', 'comp.graphics', 'comp.windows.x',
        'talk.politics.mideast', 'soc.religion.christian', 'sci.electronics', 'sci.med'  ]

# 위에서 cats 변수로 기재된 category만 추출. featch_20newsgroups( )의 categories에 cats 입력
news_df= fetch_20newsgroups(subset='all',remove=('headers', 'footers', 'quotes'), 
                            categories=cats, random_state=0)

#LDA 는 Count기반의 Vectorizer만 적용합니다.  
count_vect = CountVectorizer(max_df=0.95, max_features=1000, min_df=2, stop_words='english', ngram_range=(1,2))
feat_vect = count_vect.fit_transform(news_df.data)
print('CountVectorizer Shape:', feat_vect.shape)




# CountVectorizer Shape: (7862, 1000)

LDA 객체 생성 후 Count 피처 벡터화 객체로 LDA수행

lda = LatentDirichletAllocation(n_components=8, random_state=0)
lda.fit(feat_vect)

# LatentDirichletAllocation(n_components=8, random_state=0)

각 토픽 모델링 주제별 단어들의 연관도 확인
lda객체의 components_ 속성은 주제별로 개별 단어들의 연관도 정규화 숫자가 들어있음

shape는 주제 개수 X 피처 단어 개수

components_ 에 들어 있는 숫자값은 각 주제별로 단어가 나타난 횟수를 정규화 하여 나타냄.

숫자가 클 수록 토픽에서 단어가 차지하는 비중이 높음

print(lda.components_.shape)
lda.components_

(8, 1000)
array([[3.60992018e+01, 1.35626798e+02, 2.15751867e+01, ...,
        3.02911688e+01, 8.66830093e+01, 6.79285199e+01],
       [1.25199920e-01, 1.44401815e+01, 1.25045596e-01, ...,
        1.81506995e+02, 1.25097844e-01, 9.39593286e+01],
       [3.34762663e+02, 1.25176265e-01, 1.46743299e+02, ...,
        1.25105772e-01, 3.63689741e+01, 1.25025218e-01],
       ...,
       [3.60204965e+01, 2.08640688e+01, 4.29606813e+00, ...,
        1.45056650e+01, 8.33854413e+00, 1.55690009e+01],
       [1.25128711e-01, 1.25247756e-01, 1.25005143e-01, ...,
        9.17278769e+01, 1.25177668e-01, 3.74575887e+01],
       [5.49258690e+01, 4.47009532e+00, 9.88524814e+00, ...,
        4.87048440e+01, 1.25034678e-01, 1.25074632e-01]])

각 토픽별 중심 단어 확인

def display_topic_words(model, feature_names, no_top_words):
    for topic_index, topic in enumerate(model.components_):
        print('\nTopic #',topic_index)

        # components_ array에서 가장 값이 큰 순으로 정렬했을 때, 그 값의 array index를 반환. 
        topic_word_indexes = topic.argsort()[::-1]
        top_indexes=topic_word_indexes[:no_top_words]
        
        # top_indexes대상인 index별로 feature_names에 해당하는 word feature 추출 후 join으로 concat
        feature_concat = ' + '.join([str(feature_names[i])+'*'+str(round(topic[i],1)) for i in top_indexes])                
        print(feature_concat)

# CountVectorizer객체내의 전체 word들의 명칭을 get_features_names( )를 통해 추출
feature_names = count_vect.get_feature_names()

# Topic별 가장 연관도가 높은 word를 15개만 추출
display_topic_words(lda, feature_names, 15)

# 모토사이클, 야구, 그래픽스, 윈도우즈, 중동, 기독교, 전자공학, 의학 등 8개 주제를 추출. 


Topic # 0
year*703.2 + 10*563.6 + game*476.3 + medical*413.2 + health*377.4 + team*346.8 + 12*343.9 + 20*340.9 + disease*332.1 + cancer*319.9 + 1993*318.3 + games*317.0 + years*306.5 + patients*299.8 + good*286.3

Topic # 1
don*1454.3 + just*1392.8 + like*1190.8 + know*1178.1 + people*836.9 + said*802.5 + think*799.7 + time*754.2 + ve*676.3 + didn*675.9 + right*636.3 + going*625.4 + say*620.7 + ll*583.9 + way*570.3

Topic # 2
image*1047.7 + file*999.1 + jpeg*799.1 + program*495.6 + gif*466.0 + images*443.7 + output*442.3 + format*442.3 + files*438.5 + color*406.3 + entry*387.6 + 00*334.8 + use*308.5 + bit*308.4 + 03*258.7

Topic # 3
like*620.7 + know*591.7 + don*543.7 + think*528.4 + use*514.3 + does*510.2 + just*509.1 + good*425.8 + time*417.4 + book*410.7 + read*402.9 + information*395.2 + people*393.5 + used*388.2 + post*368.4

Topic # 4
armenian*960.6 + israel*815.9 + armenians*699.7 + jews*690.9 + turkish*686.1 + people*653.0 + israeli*476.1 + jewish*467.0 + government*464.4 + war*417.8 + dos dos*401.1 + turkey*393.5 + arab*386.1 + armenia*346.3 + 000*345.2

Topic # 5
edu*1613.5 + com*841.4 + available*761.5 + graphics*708.0 + ftp*668.1 + data*517.9 + pub*508.2 + motif*460.4 + mail*453.3 + widget*447.4 + software*427.6 + mit*421.5 + information*417.3 + version*413.7 + sun*402.4

Topic # 6
god*2013.0 + people*721.0 + jesus*688.7 + church*663.0 + believe*563.0 + christ*553.1 + does*500.1 + christian*474.8 + say*468.6 + think*446.0 + christians*443.5 + bible*422.9 + faith*420.1 + sin*396.5 + life*371.2

Topic # 7
use*685.8 + dos*635.0 + thanks*596.0 + windows*548.7 + using*486.5 + window*483.1 + does*456.2 + display*389.1 + help*385.2 + like*382.8 + problem*375.7 + server*370.2 + need*366.3 + know*355.5 + run*315.3

개별 문서별 토픽 분포 확인

lda객체의 transform()을 수행하면 개별 문서별 토픽 분포를 반환함.

doc_topics = lda.transform(feat_vect)
print(doc_topics.shape)
print(doc_topics[:3])


(7862, 8)
[[0.01389701 0.01394362 0.01389104 0.48221844 0.01397882 0.01389205
  0.01393501 0.43424401]
 [0.27750436 0.18151826 0.0021208  0.53037189 0.00212129 0.00212102
  0.00212113 0.00212125]
 [0.00544459 0.22166575 0.00544539 0.00544528 0.00544039 0.00544168
  0.00544182 0.74567512]]

개별 문서별 토픽 분포도를 출력

20newsgroup으로 만들어진 문서명을 출력.

fetch_20newsgroups()으로 만들어진 데이터의 filename속성은 모든 문서의 문서명을 가지고 있음.

filename속성은 절대 디렉토리를 가지는 문서명을 가지고 있으므로 '\'로 분할하여 맨 마지막 두번째 부터 파일명으로 가져옴

def get_filename_list(newsdata):
    filename_list=[]

    for file in newsdata.filenames:
            #print(file)
            filename_temp = file.split('\\')[-2:]
            filename = '.'.join(filename_temp)
            filename_list.append(filename)
    
    return filename_list

filename_list = get_filename_list(news_df)
print("filename 개수:",len(filename_list), "filename list 10개만:",filename_list[:10])


filename 개수: 7862 filename list 10개만: ['soc.religion.christian.20630', 'sci.med.59422', 'comp.graphics.38765', 'comp.graphics.38810', 'sci.med.59449', 'comp.graphics.38461', 'comp.windows.x.66959', 'rec.motorcycles.104487', 'sci.electronics.53875', 'sci.electronics.53617']

DataFrame으로 생성하여 문서별 토픽 분포도 확인

import pandas as pd 

topic_names = ['Topic #'+ str(i) for i in range(0, 8)]
doc_topic_df = pd.DataFrame(data=doc_topics, columns=topic_names, index=filename_list)
doc_topic_df.head(20)


	Topic #0	Topic #1	Topic #2	Topic #3	Topic #4	Topic #5	Topic #6	Topic #7
soc.religion.christian.20630	0.013897	0.013944	0.013891	0.482218	0.013979	0.013892	0.013935	0.434244
sci.med.59422	0.277504	0.181518	0.002121	0.530372	0.002121	0.002121	0.002121	0.002121
comp.graphics.38765	0.005445	0.221666	0.005445	0.005445	0.005440	0.005442	0.005442	0.745675
comp.graphics.38810	0.005439	0.005441	0.005449	0.578959	0.005440	0.388387	0.005442	0.005442
sci.med.59449	0.006584	0.552000	0.006587	0.408485	0.006585	0.006585	0.006588	0.006585
comp.graphics.38461	0.008342	0.008352	0.182622	0.767314	0.008335	0.008341	0.008343	0.008351
comp.windows.x.66959	0.372861	0.041667	0.377020	0.041668	0.041703	0.041703	0.041667	0.041711
rec.motorcycles.104487	0.225351	0.674669	0.004814	0.075920	0.004812	0.004812	0.004812	0.004810
sci.electronics.53875	0.008944	0.836686	0.008932	0.008941	0.008935	0.109691	0.008932	0.008938
sci.electronics.53617	0.041733	0.041720	0.708081	0.041742	0.041671	0.041669	0.041699	0.041686
sci.electronics.54089	0.001647	0.512634	0.001647	0.152375	0.001645	0.001649	0.001647	0.326757
rec.sport.baseball.102713	0.982653	0.000649	0.013455	0.000649	0.000648	0.000648	0.000649	0.000649
rec.sport.baseball.104711	0.288554	0.007358	0.007364	0.596561	0.078082	0.007363	0.007360	0.007358
comp.graphics.38232	0.044939	0.138461	0.375098	0.003914	0.003909	0.003911	0.003912	0.425856
sci.electronics.52732	0.017944	0.874782	0.017869	0.017904	0.017867	0.017866	0.017884	0.017885
talk.politics.mideast.76440	0.003381	0.003385	0.003381	0.843991	0.135716	0.003380	0.003384	0.003382
sci.med.59243	0.491684	0.486865	0.003574	0.003577	0.003578	0.003574	0.003574	0.003574
talk.politics.mideast.75888	0.015639	0.499140	0.015641	0.015683	0.015640	0.406977	0.015644	0.015636
soc.religion.christian.21526	0.002455	0.164735	0.002455	0.002456	0.208655	0.002454	0.614333	0.002458
comp.windows.x.66408	0.000080	0.000080	0.809449	0.163054	0.000080	0.027097	0.000080	0.000080

비지도학습 기반 감성 분석

SentiWordNet을 이용한 Sentiment Analysis

• WordNet Synset과 SentiWordNet SentiSynset 클래스의 이해

import nltk
nltk.download('all')



[nltk_data] Downloading collection 'all'
[nltk_data]    | 
[nltk_data]    | Downloading package abc to
[nltk_data]    |     C:\Users\pc\AppData\Roaming\nltk_data...
[nltk_data]    |   Unzipping corpora\abc.zip.
[nltk_data]    | Downloading package alpino to
[nltk_data]    |     C:\Users\pc\AppData\Roaming\nltk_data...
[nltk_data]    |   Unzipping corpora\alpino.zip.
[nltk_data]    | Downloading package biocreative_ppi to
[nltk_data]    |     C:\Users\pc\AppData\Roaming\nltk_data...
[nltk_data]    |   Unzipping corpora\biocreative_ppi.zip.
[nltk_data]    | Downloading package brown to
[nltk_data]    |     C:\Users\pc\AppData\Roaming\nltk_data...
[nltk_data]    |   Unzipping corpora\brown.zip.
[nltk_data]    | Downloading package brown_tei to
[nltk_data]    |     C:\Users\pc\AppData\Roaming\nltk_data...
[nltk_data]    |   Unzipping corpora\brown_tei.zip.
[nltk_data]    | Downloading package cess_cat to
[nltk_data]    |     C:\Users\pc\AppData\Roaming\nltk_data...
[nltk_data]    |   Unzipping corpora\cess_cat.zip.
[nltk_data]    | Downloading package cess_esp to
[nltk_data]    |     C:\Users\pc\AppData\Roaming\nltk_data...
[nltk_data]    |   Unzipping corpora\cess_esp.zip.
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True

from nltk.corpus import wordnet as wn

term = 'present'

# 'present'라는 단어로 wordnet의 synsets 생성. 
synsets = wn.synsets(term)
print('synsets() 반환 type :', type(synsets))
print('synsets() 반환 값 갯수:', len(synsets))
print('synsets() 반환 값 :', synsets)


synsets() 반환 type : <class 'list'>
synsets() 반환 값 갯수: 18
synsets() 반환 값 : [Synset('present.n.01'), Synset('present.n.02'), Synset('present.n.03'), Synset('show.v.01'), Synset('present.v.02'), Synset('stage.v.01'), Synset('present.v.04'), Synset('present.v.05'), Synset('award.v.01'), Synset('give.v.08'), Synset('deliver.v.01'), Synset('introduce.v.01'), Synset('portray.v.04'), Synset('confront.v.03'), Synset('present.v.12'), Synset('salute.v.06'), Synset('present.a.01'), Synset('present.a.02')]

for synset in synsets :
    print('##### Synset name : ', synset.name(),'#####')
    print('POS :',synset.lexname())
    print('Definition:',synset.definition())
    print('Lemmas:',synset.lemma_names())
    
    
##### Synset name :  present.n.01 #####
POS : noun.time
Definition: the period of time that is happening now; any continuous stretch of time including the moment of speech
Lemmas: ['present', 'nowadays']
##### Synset name :  present.n.02 #####
POS : noun.possession
Definition: something presented as a gift
Lemmas: ['present']
##### Synset name :  present.n.03 #####
POS : noun.communication
Definition: a verb tense that expresses actions or states at the time of speaking
Lemmas: ['present', 'present_tense']
##### Synset name :  show.v.01 #####
POS : verb.perception
Definition: give an exhibition of to an interested audience
Lemmas: ['show', 'demo', 'exhibit', 'present', 'demonstrate']
##### Synset name :  present.v.02 #####
POS : verb.communication
Definition: bring forward and present to the mind
Lemmas: ['present', 'represent', 'lay_out']
##### Synset name :  stage.v.01 #####
POS : verb.creation
Definition: perform (a play), especially on a stage
Lemmas: ['stage', 'present', 'represent']
##### Synset name :  present.v.04 #####
POS : verb.possession
Definition: hand over formally
Lemmas: ['present', 'submit']
##### Synset name :  present.v.05 #####
POS : verb.stative
Definition: introduce
Lemmas: ['present', 'pose']
##### Synset name :  award.v.01 #####
POS : verb.possession
Definition: give, especially as an honor or reward
Lemmas: ['award', 'present']
##### Synset name :  give.v.08 #####
POS : verb.possession
Definition: give as a present; make a gift of
Lemmas: ['give', 'gift', 'present']
##### Synset name :  deliver.v.01 #####
POS : verb.communication
Definition: deliver (a speech, oration, or idea)
Lemmas: ['deliver', 'present']
##### Synset name :  introduce.v.01 #####
POS : verb.communication
Definition: cause to come to know personally
Lemmas: ['introduce', 'present', 'acquaint']
##### Synset name :  portray.v.04 #####
POS : verb.creation
Definition: represent abstractly, for example in a painting, drawing, or sculpture
Lemmas: ['portray', 'present']
##### Synset name :  confront.v.03 #####
POS : verb.communication
Definition: present somebody with something, usually to accuse or criticize
Lemmas: ['confront', 'face', 'present']
##### Synset name :  present.v.12 #####
POS : verb.communication
Definition: formally present a debutante, a representative of a country, etc.
Lemmas: ['present']
##### Synset name :  salute.v.06 #####
POS : verb.communication
Definition: recognize with a gesture prescribed by a military regulation; assume a prescribed position
Lemmas: ['salute', 'present']
##### Synset name :  present.a.01 #####
POS : adj.all
Definition: temporal sense; intermediate between past and future; now existing or happening or in consideration
Lemmas: ['present']
##### Synset name :  present.a.02 #####
POS : adj.all
Definition: being or existing in a specified place
Lemmas: ['present']

# synset 객체를 단어별로 생성합니다. 
tree = wn.synset('tree.n.01')
lion = wn.synset('lion.n.01')
tiger = wn.synset('tiger.n.02')
cat = wn.synset('cat.n.01')
dog = wn.synset('dog.n.01')

entities = [tree , lion , tiger , cat , dog]
similarities = []
entity_names = [ entity.name().split('.')[0] for entity in entities]

# 단어별 synset 들을 iteration 하면서 다른 단어들의 synset과 유사도를 측정합니다. 
for entity in entities:
    similarity = [ round(entity.path_similarity(compared_entity), 2)  for compared_entity in entities ]
    similarities.append(similarity)
    
# 개별 단어별 synset과 다른 단어의 synset과의 유사도를 DataFrame형태로 저장합니다.  
similarity_df = pd.DataFrame(similarities , columns=entity_names,index=entity_names)
similarity_df


	tree	lion	tiger	cat	dog
tree	1.00	0.07	0.07	0.08	0.12
lion	0.07	1.00	0.33	0.25	0.17
tiger	0.07	0.33	1.00	0.25	0.17
cat	0.08	0.25	0.25	1.00	0.20
dog	0.12	0.17	0.17	0.20	1.00

import nltk
from nltk.corpus import sentiwordnet as swn

senti_synsets = list(swn.senti_synsets('slow'))
print('senti_synsets() 반환 type :', type(senti_synsets))
print('senti_synsets() 반환 값 갯수:', len(senti_synsets))
print('senti_synsets() 반환 값 :', senti_synsets)



senti_synsets() 반환 type : <class 'list'>
senti_synsets() 반환 값 갯수: 11
senti_synsets() 반환 값 : [SentiSynset('decelerate.v.01'), SentiSynset('slow.v.02'), SentiSynset('slow.v.03'), SentiSynset('slow.a.01'), SentiSynset('slow.a.02'), SentiSynset('dense.s.04'), SentiSynset('slow.a.04'), SentiSynset('boring.s.01'), SentiSynset('dull.s.08'), SentiSynset('slowly.r.01'), SentiSynset('behind.r.03')]

import nltk
from nltk.corpus import sentiwordnet as swn

father = swn.senti_synset('father.n.01')
print('father 긍정감성 지수: ', father.pos_score())
print('father 부정감성 지수: ', father.neg_score())
print('father 객관성 지수: ', father.obj_score())
print('\n')
fabulous = swn.senti_synset('fabulous.a.01')
print('fabulous 긍정감성 지수: ',fabulous .pos_score())
print('fabulous 부정감성 지수: ',fabulous .neg_score())


father 긍정감성 지수:  0.0
father 부정감성 지수:  0.0
father 객관성 지수:  1.0


fabulous 긍정감성 지수:  0.875
fabulous 부정감성 지수:  0.125

from nltk.corpus import wordnet as wn

# 간단한 NTLK PennTreebank Tag를 기반으로 WordNet기반의 품사 Tag로 변환
def penn_to_wn(tag):
    if tag.startswith('J'):
        return wn.ADJ
    elif tag.startswith('N'):
        return wn.NOUN
    elif tag.startswith('R'):
        return wn.ADV
    elif tag.startswith('V'):
        return wn.VERB
    return

from nltk.stem import WordNetLemmatizer
from nltk.corpus import sentiwordnet as swn
from nltk import sent_tokenize, word_tokenize, pos_tag

def swn_polarity(text):
    # 감성 지수 초기화 
    sentiment = 0.0
    tokens_count = 0
    
    lemmatizer = WordNetLemmatizer()
    raw_sentences = sent_tokenize(text)
    # 분해된 문장별로 단어 토큰 -> 품사 태깅 후에 SentiSynset 생성 -> 감성 지수 합산 
    for raw_sentence in raw_sentences:
        # NTLK 기반의 품사 태깅 문장 추출  
        tagged_sentence = pos_tag(word_tokenize(raw_sentence))
        for word , tag in tagged_sentence:
            
            # WordNet 기반 품사 태깅과 어근 추출
            wn_tag = penn_to_wn(tag)
            if wn_tag not in (wn.NOUN , wn.ADJ, wn.ADV):
                continue                   
            lemma = lemmatizer.lemmatize(word, pos=wn_tag)
            if not lemma:
                continue
            # 어근을 추출한 단어와 WordNet 기반 품사 태깅을 입력해 Synset 객체를 생성. 
            synsets = wn.synsets(lemma , pos=wn_tag)
            if not synsets:
                continue
            # sentiwordnet의 감성 단어 분석으로 감성 synset 추출
            # 모든 단어에 대해 긍정 감성 지수는 +로 부정 감성 지수는 -로 합산해 감성 지수 계산. 
            synset = synsets[0]
            swn_synset = swn.senti_synset(synset.name())
            sentiment += (swn_synset.pos_score() - swn_synset.neg_score())           
            tokens_count += 1
    
    if not tokens_count:
        return 0
    
    # 총 score가 0 이상일 경우 긍정(Positive) 1, 그렇지 않을 경우 부정(Negative) 0 반환
    if sentiment >= 0 :
        return 1
    
    return 0

review_df['preds'] = review_df['review'].apply( lambda x : swn_polarity(x) )
y_target = review_df['sentiment'].values
preds = review_df['preds'].values

from sklearn.metrics import accuracy_score, confusion_matrix, precision_score 
from sklearn.metrics import recall_score, f1_score, roc_auc_score

print(confusion_matrix( y_target, preds))
print("정확도:", accuracy_score(y_target , preds))
print("정밀도:", precision_score(y_target , preds))
print("재현율:", recall_score(y_target, preds))



[[7668 4832]
 [3636 8864]]
정확도: 0.66128
정밀도: 0.647196261682243
재현율: 0.70912

VADER lexicon을 이용한 Sentiment Analysis

from nltk.sentiment.vader import SentimentIntensityAnalyzer

senti_analyzer = SentimentIntensityAnalyzer()
senti_scores = senti_analyzer.polarity_scores(review_df['review'][0])
print(senti_scores)


# {'neg': 0.13, 'neu': 0.743, 'pos': 0.127, 'compound': -0.7943}

def vader_polarity(review,threshold=0.1):
    analyzer = SentimentIntensityAnalyzer()
    scores = analyzer.polarity_scores(review)
    
    # compound 값에 기반하여 threshold 입력값보다 크면 1, 그렇지 않으면 0을 반환 
    agg_score = scores['compound']
    final_sentiment = 1 if agg_score >= threshold else 0
    return final_sentiment

# apply lambda 식을 이용하여 레코드별로 vader_polarity( )를 수행하고 결과를 'vader_preds'에 저장
review_df['vader_preds'] = review_df['review'].apply( lambda x : vader_polarity(x, 0.1) )
y_target = review_df['sentiment'].values
vader_preds = review_df['vader_preds'].values

print('#### VADER 예측 성능 평가 ####')
from sklearn.metrics import accuracy_score, confusion_matrix, precision_score 
from sklearn.metrics import recall_score, f1_score, roc_auc_score

print(confusion_matrix( y_target, vader_preds))
print("정확도:", accuracy_score(y_target , vader_preds))
print("정밀도:", precision_score(y_target , vader_preds))
print("재현율:", recall_score(y_target, vader_preds))


#### VADER 예측 성능 평가 ####
[[ 6736  5764]
 [ 1867 10633]]
정확도: 0.69476
정밀도: 0.6484722815149113
재현율: 0.85064