aky15

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The usage of left_chunk_size is different from num_left_chunks in k2. By definitions in [tutorial](https://github.com/espnet/espnet/blob/master/doc/espnet2_tutorial.md) and [encoder](https://github.com/espnet/espnet/blob/master/espnet2/asr_transducer/encoder/building.py), it's the number of frames in the left context, so left_chunk_size = num_left_chunks *...

ESPnet2
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