AvaisP/Neural_Conversation_Models

Tensorflow based Neural Conversation Models

Neural_Conversation_Models

================================= This implementation contains an extension of seq2seq tutorial for conversation models in Tensorflow:

1. Option to use Beam Search and Beam Size for decoding

2. Currently, it supports

   • Simple seq2seq models
   • Attention based seq2seq models

3. To get better results use beam search during decoding / inference

Examples of basic model can be found in this paper.

https://arxiv.org/abs/1702.05512

Usage

$ CUDA_VISIBLE_DEVICES=3 python neural_conversation_model.py --en_vocab_size=40000 --size=256 --data_path=/home/data/ljc/film_caption/corpus_ncm/film_data --vocab_path=/home/data/ljc/film_caption/corpus_ncm/film_vocab_most --dev_data=/home/data/ljc/film_caption/corpus_ncm/film_data --attention

$ CUDA_VISIBLE_DEVICES=3 python neural_conversation_model.py --train_dir ubuntu/ --en_vocab_size 1699 --size 512 --data_path ubuntu/my_train_2 --dev_data ubuntu/my_train_2  --vocab_path ubuntu/my_train_2_vocab --attention
$ CUDA_VISIBLE_DEVICES=3 python neural_conversation_model.py --train_dir ubuntu/ --en_vocab_size 1699 --size 512 --data_path ubuntu/my_train_2 --dev_data ubuntu/my_train_2  --vocab_path ubuntu/my_train_2_vocab --attention --decode --beam_search --beam_size 25

File list

• read_chat_data_test.py: test the format of text data red in.

Convert to tf 1.0

• my_seq2seq.py: from tensorflow.python.ops import rnn --> from tensorflow.contrib.rnn.python.ops import core_rnn

• my_seq2seq.py: rnn.rnn --> core_rnn.static_rnn

• my_seq2seq.py: from tensorflow.python.ops.rnn_cell import _linear as linear --> from tensorflow.contrib.rnn.python.ops.core_rnn_cell_impl import _linear as linear

• my_seq2seq.py: from tensorflow.python.ops import rnn_cell --> from tensorflow.contrib.rnn.python.ops import core_rnn_cell as rnn_cell

• my_seq2seq.py: op_scope --> name_scope

• my_seq2seq.py: attention_states = array_ops.concat(1, top_states) --> attention_states = array_ops.concat(axis=1, values=top_states)

• my_seq2seq.py: array_ops.pack --> array_ops.stack

• my_seq2seq.py: def embedding_attention_seq2seq(encoder_inputs, decoder_inputs, cell, ... --> def embedding_attention_seq2seq(encoder_inputs, decoder_inputs, cell_1,cell_2, ...

• seq2seq_model.py: tf.nn.rnn_cell --> tf.contrib.rnn

• seq2seq_model.py: 在tf.nn.sampled_softmax_loss中inputs,labels-->labels, inputs,

• seq2seq_model.py:

single_cell = tf.nn.rnn_cell.GRUCell(size)
if use_lstm:
  single_cell = tf.nn.rnn_cell.BasicLSTMCell(size)
cell = single_cell
if num_layers > 1:
  cell = tf.nn.rnn_cell.MultiRNNCell([single_cell] * num_layers, state_is_tuple=False)

-------->

def gru_cell():
  return tf.contrib.rnn.core_rnn_cell.GRUCell(size, reuse=tf.get_variable_scope().reuse)#tf.get_variable_scope().reuse
def lstm_cell():
  return tf.contrib.rnn.core_rnn_cell.BasicLSTMCell(size, reuse=tf.get_variable_scope().reuse)#tf.get_variable_scope().reuse
single_cell = gru_cell
if use_lstm:
  single_cell = lstm_cell
cell = single_cell()
if num_layers > 1:
  cell_1 = tf.contrib.rnn.core_rnn_cell.MultiRNNCell([single_cell() for _ in range(num_layers)], state_is_tuple=False)
  cell_2 = tf.contrib.rnn.core_rnn_cell.MultiRNNCell([single_cell() for _ in range(num_layers)], state_is_tuple=False)

• neural_conversation_model.py: curr = range(beam_size) --> curr = list(range(beam_size))
• neural_conversation_model.py: sentence_to_token_ids(tf.compat.as_bytes(sentence), vocab) --> sentence_to_token_ids(sentence, vocab)
• neural_conversation_model.py: entities = line.lower().split("\t") --> entities = line.lower().split("|")

Prerequisites

• Python Python 3.3+ --> Python 3.6
• NLTK
• TensorFlow 0.12.1 --> TensorFlow 1.1.0

Installations

• Mac

virtualenv --no-site-packages -p /usr/local/bin/python3.6 ~/venv-py3
source ~/venv-py3/bin/activate
pip3 install --upgrade \
 https://storage.googleapis.com/tensorflow/mac/cpu/tensorflow-0.12.1-py3-none-any.whl # for CPU Usage

• Linux with GPU Driver

virtualenv --no-site-packages -p /usr/local/bin/python3.6 ~/venv-py3
source ~/venv-py3/bin/activate
pip3 install --upgrade \ https://storage.googleapis.com/tensorflow/linux/gpu/tensorflow_gpu-0.12.1-cp34-cp34m-linux_x86_64.whl

Data

Data accepted is in the tsv format where first component is the context and second is the reply

TSV format Ubuntu Dialog Data can be found here or Git repo.

example :-

1. What are you doing ? \t Writing seq2seq model .

Usage

To train a model with Ubuntu dataset:

$ python neural_conversation_model.py --train_dir ubuntu/ --en_vocab_size 60000 --size 512 --data_path ubuntu/train.tsv --dev_data ubuntu/valid.tsv  --vocab_path ubuntu/60k_vocan.en --attention

To test an existing model:

$ python neural_conversation_model.py --train_dir ubuntu/ --en_vocab_size 60000 --size 512 --data_path ubuntu/train.tsv --dev_data ubuntu/valid.tsv  --vocab_path ubuntu/60k_vocan.en --attention --decode --beam_search --beam_size 25

Todo

1. Add other state of art neural models.
2. Adding layer normalization( in progress )

https://github.com/pbhatia243/tf-layer-norm

Contact

Parminder Bhatia, parminder.bhatia243@gmail.com