BoW Naive Bayes क्लासिफ़ायर बनाना

Python में NLP के लिए Feature Engineering

Rounak Banik

Data Scientist

स्पैम फ़िल्टरिंग

message	label
WINNER!! As a valued network customer you have been selected to receive a $900 prize reward! To claim call 09061701461	spam
Ah, work. I vaguely remember that. What does it feel like?	ham

कदम

टेक्स्ट प्रीप्रोसेसिंग
बैग-ऑफ-वर्ड्स मॉडल (या रिप्रेज़ेंटेशन) बनाना
Machine Learning

CountVectorizer से टेक्स्ट प्रीप्रोसेसिंग

CountVectorizer के आर्ग्यूमेंट्स

lowercase: False, True
strip_accents: 'unciode', 'ascii', None
stop_words: 'english', list, None
token_pattern: regex
tokenizer: function

BoW मॉडल बनाना

# Import CountVectorizer
from sklearn.feature_extraction.text import CountVectorizer


# Create CountVectorizer object
vectorizer = CountVectorizer(strip_accents='ascii', stop_words='english', lowercase=False)


# Import train_test_split
from sklearn.model_selection import train_test_split

# Split into training and test sets
X_train, X_test, y_train, y_test = train_test_split(df['message'], df['label'], test_size=0.25)

BoW मॉडल बनाना

...
...
# Generate training Bow vectors
X_train_bow = vectorizer.fit_transform(X_train)


# Generate test BoW vectors
X_test_bow = vectorizer.transform(X_test)

Naive Bayes क्लासिफ़ायर का प्रशिक्षण

# Import MultinomialNB
from sklearn.naive_bayes import MultinomialNB


# Create MultinomialNB object
clf = MultinomialNB()


# Train clf
clf.fit(X_train_bow, y_train)


# Compute accuracy on test set
accuracy = clf.score(X_test_bow, y_test)
print(accuracy)

0.760051

अभ्यास करते हैं!

Python में NLP के लिए Feature Engineering