gsittyz/rnn-classifier

Minimal RNN classifier with self-attention in Pytorch

Recurrent neural network classifier with self-attention

A minimal RNN-based classification model (many-to-one) with self-attention. Tested on master branches of both torch (commit 5edf6b2) and torchtext (commit c839a79). The volatile warnings that might be printed are due to using pytorch version 4 with torchtext.

Inspired by @Keon's barebone seq2seq implementation, this repository aims to provide a minimal implementation of an RNN classifier with self-attention.

Model description:

• LSTM or GRU encoder for the embedded input sequence
• Scaled dot-product self-attention with the encoder outputs as keys and values and the hidden state as the query
• Logistic regression classifier on top of attention outputs

Arguments:

  --data DATA        Corpus: [SST, TREC, IMDB]
  --model MODEL      type of recurrent net [LSTM, GRU]
  --emsize EMSIZE    size of word embeddings [Uses pretrained on 50, 100, 200, 300]
  --hidden HIDDEN    number of hidden units for the RNN encoder
  --nlayers NLAYERS  number of layers of the RNN encoder
  --lr LR            initial learning rate
  --clip CLIP        gradient clipping
  --epochs EPOCHS    upper epoch limit
  --batch_size N     batch size
  --drop DROP        dropout
  --bi               bidirectional encoder
  --cuda             [DONT] use CUDA
  --fine             use fine grained labels in SST # currently unused

A sample set of arguments can be viewed in run.sh.

Results

Accuracy on test set after 5 epochs of the model with sample params:

	SST	TREC	IMDB
run.sh	80.340%	87.000%	86.240%