import tensorflow as tf

    with tf.variable_scope('decoder_{}'.format(decoder.name)):
        initial_context, _ = look(0, initial_output, initial_input, pos=initial_pos, prev_weights=initial_weights,
                                  context=zero_context)
    initial_data = tf.concat([initial_state, initial_context, tf.expand_dims(initial_pos, axis=1), initial_weights],
                             axis=1)
    context_size = initial_context.shape[1].value
