TypeError: object of type 'SingleCutSampler' has no len()

[cdxie]

hi，I run the decode steps of tdnn-lstm-ctc, I meet the following error:
-> def decode_dataset(
(Pdb) n

icefall/egs/librispeech/ASR/tdnn_lstm_ctc/decode.py(300)decode_dataset()
-> results = []
(Pdb)
icefall/egs/librispeech/ASR/tdnn_lstm_ctc/decode.py(302)decode_dataset()
-> num_cuts = 0
(Pdb)
icefall/egs/librispeech/ASR/tdnn_lstm_ctc/decode.py(304)decode_dataset()
-> try:
(Pdb)
icefall/egs/librispeech/ASR/tdnn_lstm_ctc/decode.py(305)decode_dataset()
-> num_batches = len(dl)
(Pdb)
TypeError: object of type 'SingleCutSampler' has no len()

Is this a problem with the version I used?

k2 version: 1.8

[csukuangfj]

Please update your icefall