Embedding RNN sequence-to-sequence model.
tf.contrib.legacy_seq2seq.embedding_rnn_seq2seq( encoder_inputs, decoder_inputs, cell, num_encoder_symbols, num_decoder_symbols, embedding_size, output_projection=None, feed_previous=False, dtype=None, scope=None )
This model first embeds encoder_inputs by a newly created embedding (of shape [num_encoder_symbols x input_size]). Then it runs an RNN to encode embedded encoder_inputs into a state vector. Next, it embeds decoder_inputs by another newly created embedding (of shape [num_decoder_symbols x input_size]). Then it runs RNN decoder, initialized with the last encoder state, on embedded decoder_inputs.
encoder_inputs: A list of 1D int32 Tensors of shape [batch_size].
decoder_inputs: A list of 1D int32 Tensors of shape [batch_size].
cell: tf.compat.v1.nn.rnn_cell.RNNCell defining the cell function and size.
num_encoder_symbols: Integer; number of symbols on the encoder side.
num_decoder_symbols: Integer; number of symbols on the decoder side.
embedding_size: Integer, the length of the embedding vector for each symbol.
output_projection: None or a pair (W, B) of output projection weights and biases; W has shape [output_size x num_decoder_symbols] and B has shape [num_decoder_symbols]; if provided and feed_previous=True, each fed previous output will first be multiplied by W and added B.
feed_previous: Boolean or scalar Boolean Tensor; if True, only the first of decoder_inputs will be used (the "GO" symbol), and all other decoder inputs will be taken from previous outputs (as in embedding_rnn_decoder). If False, decoder_inputs are used as given (the standard decoder case).
dtype: The dtype of the initial state for both the encoder and encoder rnn cells (default: tf.float32).
scope: VariableScope for the created subgraph; defaults to "embedding_rnn_seq2seq"
A tuple of the form (outputs, state), where: outputs: A list of the same length as decoder_inputs of 2D Tensors. The output is of shape [batch_size x cell.output_size] when output_projection is not None (and represents the dense representation of predicted tokens). It is of shape [batch_size x num_decoder_symbols] when output_projection is None. state: The state of each decoder cell in each time-step. This is a list with length len(decoder_inputs) -- one item for each time-step. It is a 2D Tensor of shape [batch_size x cell.state_size].