Fix definition of positive/negative

README.md

@@ -120,7 +120,7 @@ for Text Classification. Advances in Neural Information Processing Systems 28
 DESCRIPTION
 
 The Yelp reviews polarity dataset is constructed by considering stars 1 and 2
-negative, and 3 and 4 positive. For each polarity 280,000 training samples and
+negative, and 4 and 5 positive. For each polarity 280,000 training samples and
 19,000 testing samples are take randomly. In total there are 560,000 trainig
 samples and 38,000 testing samples. Negative polarity is class 1,
 and positive class 2.