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Perform dynamic decoding with decoder.

Calls initialize() once and step() repeatedly on the Decoder object.

decoder A Decoder instance.
output_time_major Python boolean. Default: False (batch major). If True, outputs are returned as time major tensors (this mode is faster). Otherwise, outputs are returned as batch major tensors (this adds extra time to the computation).
impute_finished Python boolean. If True, then states for batch entries which are marked as finished get copied through and the corresponding outputs get zeroed out. This causes some slowdown at each time step, but ensures that the final state and outputs have the correct values and that backprop ignores time steps that were marked as finished.
maximum_iterations int32 scalar, maximum allowed number of decoding steps. Default is None (decode until the decoder is fully done).
parallel_iterations Argument passed to tf.while_loop.
swap_memory Argument passed to tf.while_loop.
scope Optional variable scope to use.
**kwargs dict, other keyword arguments for dynamic_decode. It might contain arguments for BaseDecoder to initialize, which takes all tensor inputs during call().

(final_outputs, final_state, final_sequence_lengths).

TypeError if decoder is not an instance of Decoder.
ValueError if maximum_iterations is provided but is not a scalar.