Extend prefix as represented by `prefix_states` by one more step. This function is expected to be called during fast decoding of Transformer models. Args: theta: A `.NestedMap` object containing weights' values of this layer and its children layers. encoder_outputs:
(self,
theta,
encoder_outputs,
new_ids,
time_step,
prefix_states,
use_short_seq_opt=False)
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