from?sklearn.feature_extraction.text?import?CountVectorizer
from?sklearn.feature_extraction.text?import?TfidfTransformer
from?sklearn.naive_bayes?import?MultinomialNB
from?sklearn.linear_model?import?SGDClassifier
from?sklearn.linear_model?import?LogisticRegression
from?sklearn.pipeline?import?Pipeline
from?yelp_utils?import?numLines?loadData
import?sys
import?time
import?numpy?as?np
from?sklearn?import?metrics


#?文本情感分類
def?classify（technique?posneg?percentData）:
????#?讀取數(shù)據(jù)（按比列分配測試集與訓(xùn)練集-可自行調(diào)節(jié)）
????filename?=?‘Phoenix_reviews_filtered.json‘
????num_lines?=?numLines（filename）
????linesToRead?=?int（num_lines*（float（percentData）/100.0））
????train_end?=?linesToRead*0.7

????train_data?train_labels?=?loadData（filename?0?train_end?posneg）
????test_data?test_labels?=?loadData（filename?train_end+1?linesToRead?posneg）
????#?選取分類方式（貝葉斯、svm、邏輯回歸）
????if?technique?==?‘nb‘:
????????clf_obj?=?MultinomialNB（）
????elif?technique?==?‘svm‘:
????????clf_obj?=?SGDClassifier（loss=‘hinge‘?penalty=‘l2‘?alpha=1e-3?n_iter=5?random_state=42）
????elif?technique?==?‘lr‘:
????????clf_obj?=?LogisticRegression（）

????start_time?=?time.time（）
????#?將原始評論數(shù)據(jù)進(jìn)行預(yù)處理（分詞）并用TF-IDF進(jìn)行文本向量化
????text_clf?=?Pipeline（[（‘vect‘?CountVectorizer（stop_words=‘english‘））
????????????????????????（‘tfidf‘?TfidfTransformer（））
????????????????????????（‘clf‘?clf_obj）
????]）
????#?用訓(xùn)練集進(jìn)行訓(xùn)練
????text_clf?=?text_clf.fit（train_data?train_labels）
????#?用測試集進(jìn)行預(yù)測
????predicted?=?text_clf.predict（test_data）
????print（“time:?%s?seconds“?%?（time.time（）?-?start_time））
????#?顯示預(yù)測評估結(jié)果
????get_metrics（true_labels=test_labels?predicted_labels=predicted）


def?get_metrics（true_labels?predicted_labels）:
????print（‘Accuracy:‘?np.round（
????????metrics.accuracy_score（true_labels
???????????????????????????????predicted_labels）
????????2））
????print（‘Precision:‘?np.round（
????????metrics.precision_score（true_labels
????????????????????????????????predicted_labels
????????????????????????????????average=‘weighted‘）
????????2））
????print（‘Recall:‘?np.round（
????????metrics.recall_score（true_labels
?????????????????????????????predicted_labels
?????????????????????????????average=‘weighted‘）
????????2））
????print（‘F1?Score:‘?np.round（
????????metrics.f1_score（true_labels
?????????????????????????predicted_labels
?????????????????????????average=‘weighted‘）
????????2））


def?print_usage（）:
????print（“Usage:?classify.py???“）
????print（“e.g.?classify.py?nb?True?85“）


def?valid_args（avail_techniques?technique?posneg?percentData）:
????return?technique?in?avail_techniques?and\
????????????（posneg?==?‘True‘?or?posneg?==?‘False‘）?and\
????????????（int（percentData）?>=?0?and?int（percentData）?<=?100）


if?__name__?==?‘__main__‘:
????techniques?=?{‘nb‘:?‘Naive?Bayes‘?‘svm‘:?‘Support?Vector?Machines‘?‘lr‘:?‘Logistic?Regression‘}
????
????try:
????????technique?=?sys.arg

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-12-15?11:54??Sentiment-Analysis-Logistic\
?????目錄???????????0??2018-12-15?11:56??Sentiment-Analysis-Logistic\.idea\
?????文件?????????600??2018-12-15?10:25??Sentiment-Analysis-Logistic\.idea\Sentiment-Analysis-Logistic.iml
?????目錄???????????0??2018-12-15?11:56??Sentiment-Analysis-Logistic\.idea\inspectionProfiles\
?????目錄???????????0??2018-12-15?10:25??Sentiment-Analysis-Logistic\.idea\libraries\
?????文件?????????128??2018-12-15?10:25??Sentiment-Analysis-Logistic\.idea\libraries\R_User_Library.xml
?????文件?????????306??2018-12-15?10:21??Sentiment-Analysis-Logistic\.idea\modules.xml
?????文件???????12842??2018-12-15?11:56??Sentiment-Analysis-Logistic\.idea\workspace.xml
?????文件????????1081??2016-01-03?07:56??Sentiment-Analysis-Logistic\MIT-LICENSE
?????文件????70445752??2018-12-06?23:54??Sentiment-Analysis-Logistic\Phoenix_reviews_filtered.json
?????文件????????2078??2016-01-03?07:56??Sentiment-Analysis-Logistic\README.md
?????目錄???????????0??2018-12-15?10:28??Sentiment-Analysis-Logistic\__pycache__\
?????文件?????????898??2018-12-15?10:28??Sentiment-Analysis-Logistic\__pycache__\yelp_utils.cpython-35.pyc
?????文件????????3855??2018-12-15?11:54??Sentiment-Analysis-Logistic\classify.py
?????文件?????????643??2018-12-15?10:28??Sentiment-Analysis-Logistic\yelp_utils.py