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TensorFlow (Keras) Attention Layer for RNN based models

Build Status (CircleCI)

Version (s)

  • TensorFlow: 2.9.1 (Tested)
  • TensorFlow: 1.15.0 (Soon to be deprecated)

Introduction

This is an implementation of Attention (only supports Bahdanau Attention right now)

Project structure

data (Download data and place it here)
 |--- small_vocab_en.txt
 |--- small_vocab_fr.txt
src
 |--- layers
       |--- attention.py (Attention implementation)
 |--- examples
       |--- nmt
             |--- model.py (NMT model defined with Attention)
             |--- train.py ( Code for training/inferring/plotting attention with NMT model)
       |--- nmt_bidirectional
             |--- model.py (NMT birectional model defined with Attention)
             |--- train.py ( Code for training/inferring/plotting attention with NMT model)

How to use

Just like you would use any other tensoflow.python.keras.layers object.

from attention_keras.src.layers.attention import AttentionLayer

attn_layer = AttentionLayer(name='attention_layer')
attn_out, attn_states = attn_layer([encoder_outputs, decoder_outputs])

Here,

  • encoder_outputs - Sequence of encoder ouptputs returned by the RNN/LSTM/GRU (i.e. with return_sequences=True)
  • decoder_outputs - The above for the decoder
  • attn_out - Output context vector sequence for the decoder. This is to be concat with the output of decoder (refer model/nmt.py for more details)
  • attn_states - Energy values if you like to generate the heat map of attention (refer model.train_nmt.py for usage)

Visualizing Attention weights

An example of attention weights can be seen in model.train_nmt.py

After the model trained attention result should look like below.

Attention heatmap

Running the NMT example

Prerequisites

  • In order to run the example you need to download small_vocab_en.txt and small_vocab_fr.txt from Udacity deep learning repository and place them in the data folder.

Using the docker image

  • If you would like to run this in the docker environment, simply running run.sh will take you inside the docker container.
  • E.g. usage run.sh -v <TF_VERSION> [-g]
    • -v specifies the TensorFlow version (defaults to latest)
    • -g if specified use the GPU compatible Docker image

Using a virtual environment

  • If you would like to use a virtual environment, first create and activate the virtual environment.
  • Then, use either
    • pip install -r requirements.txt -r requirements_tf_cpu.txt (For CPU)
    • pip install -r requirements.txt -r requirements_tf_gpu.txt (For GPU)

Running the code

  • Go to the . Any example you run, you should run from the folder (the main folder). Otherwise, you will run into problems with finding/writing data.
  • Run python3 src/examples/nmt/train.py. Set degug=True if you need to run simple and faster.
  • If run successfully, you should have models saved in the model dir and attention.png in the results dir.

If you would like to show support

If you'd like to show your appreciation you can buy me a coffee. No stress! It's totally optional. The support I recieved would definitely an added benefit to maintain the repository and continue on my other contributions.

If you have improvements (e.g. other attention mechanisms), contributions are welcome!