Fix style checking

.flake8

@@ -5,6 +5,7 @@ max-line-length = 80
 per-file-ignores =
     # line too long
     egs/librispeech/ASR/conformer_ctc/conformer.py: E501,
+    egs/librispeech/ASR/conformer_ctc/decode.py: E501,
 
 exclude =
   .git,

egs/librispeech/ASR/tdnn_lstm_ctc/decode.py

@@ -43,6 +43,7 @@ from icefall.utils import (
     setup_logger,
     store_transcripts,
     write_error_stats,
+    str2bool,
 )
 
 

egs/librispeech/ASR/tdnn_lstm_ctc/pretrained.py

@@ -219,7 +219,7 @@ def main():
         features, batch_first=True, padding_value=math.log(1e-10)
     )
     features = features.permute(0, 2, 1)  # now features is [N, C, T]
-    
+
     with torch.no_grad():
         nnet_output = model(features)
         # nnet_output is [N, T, C]