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Neural Sentiment Classification

Neural Sentiment Classification aims to classify the sentiment in a document with neural models, which has been the state-of-the-art methods for sentiment classification. In this project, we provide our implementations of NSC, NSC+LA and NSC+UPA [Chen et al., 2016] in which user and product information is considered via attentions over different semantic levels.

Evaluation Results

Evaluation results on document-level sentiment classification. Acc.(Accuracy) and RMSE are the evaluation metrics.

In the above table, baseline models including Majority, Trigram, TextFeature, UPF, AvgWordvec, SSWE, RNTN + RNN, Paragraph Vector, JMARS and UPNN are reported in [Tang et al., 2015].

Data

We provide IMDB, Yelp13 and Yelp14 datasets we used for sentiment classification in [Download]. The dataset should be decompressed and put in the folder NSC/, NSC+LA/ or NSC+UPA/.

We prepocess the original data to make it satisfy the input format of our codes. The original datasets are released by the paper [Tang et al., 2015]. [Download]

Pre-trained word vectors are learned on each dataset (IMDB, Yelp13, Yelp14) separately.

The dataset in each domain contains seven files, using the following format:

• train.txt: training file, format (userid productid class document), split by '\t'.
• dev.txt: dev file, same format as train.txt.
• test.txt: test file, same format as train.txt.
• wordlist.txt: corresponding words with same sequence in pre-trained word vectors, one per line.
• usrlist.txt: user ids in each dataset, per one line.
• prdlist.txt: product ids in each dataset, per one line.
• embinit.save: the pre-trained word embedding file, which is saved as pickle and can be loaded from pickle to numpy arrays.

The trained model can be found at this link.

Codes

The source codes of various models are put in the folders NSC/src, NSC+LA/src, NSC+UPA/src.

Train

For training, you need to type the following command in the folder src/ of each model:

THEANO_FLAGS="floatX=float32,device=gpu" python train.py $dataset $class

where dataset is the corresponding dataset folder, class is the number of corresponding domain.

For example, we use the following command when classfing the IMDB document:

THEANO_FLAGS="floatX=float32,device=gpu" python train.py IMDB 10

The training model file will be saved in the folder model/bestmodel/ of each model.

Test

For testing, you need to type the following command in the folder src/ of each model:

THEANO_FLAGS="floatX=float32,device=gpu" python test.py $dataset $class

where dataset is the corresponding dataset folder, class is the number of corresponding domain.

For example, we use the following command when classfing the IMDB document:

THEANO_FLAGS="floatX=float32,device=gpu" python test.py IMDB 10

The testing result which reports the Accuracy and RMSE will be shown in screen.

Cite

If you use the code, please cite the following paper:

[Chen et al., 2016] Huimin Chen, Maosong Sun, Cunchao Tu, Yankai Lin and Zhiyuan Liu. Neural Sentiment Classification with User and Product Attention. In proceedings of EMNLP.[pdf]

Reference

[Chen et al., 2016] Huimin Chen, Maosong Sun, Cunchao Tu, Yankai Lin and Zhiyuan Liu. Neural Sentiment Classification with User and Product Attention. In proceedings of EMNLP.[pdf]

[Tang et al., 2015] Duyu Tang, Bing Qin, Ting Liu. Learning Semantic Representations of Users and Products for Document Level Sentiment Classification. In Proceedings of EMNLP.