configs/_base_/recog_models/nrtr_modality_transform.py

label_convertor = dict(
    type='AttnConvertor', dict_type='DICT36', with_unknown=True, lower=True)

model = dict(
    type='NRTR',
    backbone=dict(type='NRTRModalityTransform'),
    encoder=dict(type='NRTREncoder', n_layers=12),
    decoder=dict(type='NRTRDecoder'),
    loss=dict(type='TFLoss'),
    label_convertor=label_convertor,
    max_seq_len=40)