Fix beam search output_log_prob index error#732
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beam_width), but id_offset assumes that the shape of tensor is ((max_input_length + gen_legnth), batch_size * beam_width).
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output_log_probs's shape should be
(gen_length, batch_size*beam_width),but id_offset assumes that the shape of tensor is
(max_input_length+gen_legnth, batch_size*beam_width).So, I define new index
gen_offsetwhich assumes that the shape of tensor is(gen_length, batch_size*beam_width).