MR

MR Movie Reviews is a dataset for use in sentiment-analysis experiments. Available are collections of movie-review documents labeled with respect to their overall sentiment polarity (positive or negative) or subjective rating (e.g., "two and a half stars") and sentences labeled with respect to their subjectivity status (subjective or objective) or polarity.

Source: http://www.cs.cornell.edu/people/pabo/movie-review-data/ Image Source: https://storage.googleapis.com/kaggle-competitions/kaggle/3810/media/treebank.png