beam_size: 10
decode_batch_size: 128
error_rate_type: cer 
decoding_method: attention # 'attention', 'ctc_greedy_search', 'ctc_prefix_beam_search', 'attention_rescoring'
ctc_weight: 0.5 # ctc weight for attention rescoring decode mode.
decoding_chunk_size: 16 # decoding chunk size. Defaults to -1.
    # <0: for decoding, use full chunk.
    # >0: for decoding, use fixed chunk size as set.
    # 0: used for training, it's prohibited here. 
num_decoding_left_chunks: -1  # number of left chunks for decoding. Defaults to -1.
simulate_streaming: True  # simulate streaming inference. Defaults to False.
