Added bigram 1M results

Author: piyushghai

bigram_results.txt

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+MODEL: Bigram Multinomial Naive Bayes
+
+Precision: 0.613057622984
+Recall: 0.635938220885
+F1: 0.610315416972
+Accuracy: 0.635938220885
+
+Classification Report:
+             precision    recall  f1-score   support
+
+     1 star       0.71      0.74      0.72     25392
+     2 star       0.51      0.14      0.22     20208
+     3 star       0.46      0.26      0.34     30929
+     4 star       0.49      0.50      0.50     74610
+     5 star       0.72      0.87      0.79    121963
+
+avg / total       0.61      0.64      0.61    273102
+
+
+Precision variance: 0.063552
+
+Recall variance: 0.383092