Create tfidf.py

tfidf.py

@@ -0,0 +1,6 @@
+```python
+from sklearn.feature_extraction.text import TfidfVectorizer
+tfidf = TfidfVectorizer(max_features=5000, ngram_range=(1, 2), stop_words='english')
+X_train_tfidf = tfidf.fit_transform(X_train)
+X_test_tfidf = tfidf.transform(X_test)
+```