deeppavlov/core/layers/tf_layers.py
def cudnn_lstm(units, n_hidden, n_layers=1, trainable_initial_states=None, seq_lengths=None, initial_h=None,
               initial_c=None, name='cudnn_lstm', reuse=False):
    """ Fast CuDNN LSTM implementation

        Args:
            units: tf.Tensor with dimensions [B x T x F], where
                B - batch size
                T - number of tokens
                F - features
            n_hidden: dimensionality of hidden state
            n_layers: number of layers
            trainable_initial_states: whether to create a special trainable variable
                to initialize the hidden states of the network or use just zeros
            seq_lengths: tensor of sequence lengths with dimension [B]
            initial_h: optional initial hidden state, masks trainable_initial_states
                if provided
            initial_c: optional initial cell state, masks trainable_initial_states
                if provided
            name: name of the variable scope to use
            reuse:whether to reuse already initialized variable


        Returns:
            h - all hidden states along T dimension,
                tf.Tensor with dimensionality [B x T x F]
            h_last - last hidden state, tf.Tensor with dimensionality [B x H]
                where H - number of hidden units
            c_last - last cell state, tf.Tensor with dimensionality [B x H]
                where H - number of hidden units
        """
    with tf.variable_scope(name, reuse=reuse):
        lstm = tf.contrib.cudnn_rnn.CudnnLSTM(num_layers=n_layers,
                                              num_units=n_hidden)
        if trainable_initial_states:
            init_h = tf.get_variable('init_h', [n_layers, 1, n_hidden])
            init_h = tf.tile(init_h, (1, tf.shape(units)[0], 1))
            init_c = tf.get_variable('init_c', [n_layers, 1, n_hidden])
            init_c = tf.tile(init_c, (1, tf.shape(units)[0], 1))
        else:
            init_h = init_c = tf.zeros([n_layers, tf.shape(units)[0], n_hidden])

        initial_h = initial_h or init_h
        initial_c = initial_c or init_c

        h, (h_last, c_last) = lstm(tf.transpose(units, (1, 0, 2)), (initial_h, initial_c))
        h = tf.transpose(h, (1, 0, 2))
        h_last = h_last[-1]
        c_last = c_last[-1]

        # Extract last states if they are provided
        if seq_lengths is not None:
            indices = tf.stack([tf.range(tf.shape(h)[0]), seq_lengths-1], axis=1)
            h_last = tf.gather_nd(h, indices)

        return h, (h_last, c_last)
def cudnn_lstm(units, n_hidden, n_layers=1, trainable_initial_states=None, seq_lengths=None, initial_h=None,
               initial_c=None, name='cudnn_lstm', reuse=False):
    with tf.variable_scope(name, reuse=reuse):
        lstm = tf.contrib.cudnn_rnn.CudnnLSTM(num_layers=n_layers,
                                              num_units=n_hidden)
        if trainable_initial_states:
            init_h = tf.get_variable('init_h', [n_layers, 1, n_hidden])
            init_h = tf.tile(init_h, (1, tf.shape(units)[0], 1))
            init_c = tf.get_variable('init_c', [n_layers, 1, n_hidden])
            init_c = tf.tile(init_c, (1, tf.shape(units)[0], 1))
        else:
            init_h = init_c = tf.zeros([n_layers, tf.shape(units)[0], n_hidden])

        initial_h = initial_h or init_h
        initial_c = initial_c or init_c

        h, (h_last, c_last) = lstm(tf.transpose(units, (1, 0, 2)), (initial_h, initial_c))
        h = tf.transpose(h, (1, 0, 2))
        h_last = h_last[-1]
        c_last = c_last[-1]

        # Extract last states if they are provided
        if seq_lengths is not None:
            indices = tf.stack([tf.range(tf.shape(h)[0]), seq_lengths-1], axis=1)
            h_last = tf.gather_nd(h, indices)

        return h, (h_last, c_last)
def cudnn_lstm ( units , n_hidden , n_layers = 1 , trainable_initial_states = None , seq_lengths = None , initial_h = None , initial_c = None , name = 'cudnn_lstm' , reuse = False ) : with tf . variable_scope ( name , reuse = reuse ) : lstm = tf . contrib . cudnn_rnn . CudnnLSTM ( num_layers = n_layers , num_units = n_hidden ) if trainable_initial_states : init_h = tf . get_variable ( 'init_h' , [ n_layers , 1 , n_hidden ] ) init_h = tf . tile ( init_h , ( 1 , tf . shape ( units ) [ 0 ] , 1 ) ) init_c = tf . get_variable ( 'init_c' , [ n_layers , 1 , n_hidden ] ) init_c = tf . tile ( init_c , ( 1 , tf . shape ( units ) [ 0 ] , 1 ) ) else : init_h = init_c = tf . zeros ( [ n_layers , tf . shape ( units ) [ 0 ] , n_hidden ] ) initial_h = initial_h or init_h initial_c = initial_c or init_c h , ( h_last , c_last ) = lstm ( tf . transpose ( units , ( 1 , 0 , 2 ) ) , ( initial_h , initial_c ) ) h = tf . transpose ( h , ( 1 , 0 , 2 ) ) h_last = h_last [ - 1 ] c_last = c_last [ - 1 ] # Extract last states if they are provided if seq_lengths is not None : indices = tf . stack ( [ tf . range ( tf . shape ( h ) [ 0 ] ) , seq_lengths - 1 ] , axis = 1 ) h_last = tf . gather_nd ( h , indices ) return h , ( h_last , c_last )
Fast CuDNN LSTM implementation

        Args:
            units: tf.Tensor with dimensions [B x T x F], where
                B - batch size
                T - number of tokens
                F - features
            n_hidden: dimensionality of hidden state
            n_layers: number of layers
            trainable_initial_states: whether to create a special trainable variable
                to initialize the hidden states of the network or use just zeros
            seq_lengths: tensor of sequence lengths with dimension [B]
            initial_h: optional initial hidden state, masks trainable_initial_states
                if provided
            initial_c: optional initial cell state, masks trainable_initial_states
                if provided
            name: name of the variable scope to use
            reuse:whether to reuse already initialized variable


        Returns:
            h - all hidden states along T dimension,
                tf.Tensor with dimensionality [B x T x F]
            h_last - last hidden state, tf.Tensor with dimensionality [B x H]
                where H - number of hidden units
            c_last - last cell state, tf.Tensor with dimensionality [B x H]
                where H - number of hidden units
Fast CuDNN LSTM implementation