Function _rnn_step

Calculate one step of a dynamic RNN minibatch. Returns an (output, state) pair conditioned on the sequence_lengths. When skip_conditionals=False, the pseudocode is something like: if t >= max_sequence_length: return (zero_output, state) if t < min_sequence_length: return call_cell(

(
    time, sequence_length, min_sequence_length, max_sequence_length,
    zero_output, state, call_cell, state_size, skip_conditionals=False)