list index out of range

W Genreate input meta fail, please check model.
W External input meta file "/tmp/tmpf7vzo6y8/traced_fastspeech_model_inputmeta.yml" is not exists.
Traceback (most recent call last):
  File "test.py", line 44, in <module>
    ret = rknn.build(do_quantization=False, dataset='./dataset.txt')
  File "/home/lix/.local/lib/python3.6/site-packages/rknn/api/rknn.py", line 238, in build
    ret = self.rknn_base.build(do_quantization=do_quantization, dataset=dataset, pack_vdata=pre_compile, batch_size=rknn_batch_size)
  File "rknn/api/rknn_base.py", line 719, in rknn.api.rknn_base.RKNNBase.build
  File "rknn/api/rknn_base.py", line 2249, in rknn.api.rknn_base.RKNNBase._generate_inputmeta
IndexError: list index out of range

rknn 能load，为什么build会出问题