Fix style issues.

.flake8

@@ -4,7 +4,7 @@ statistics=true
 max-line-length = 80
 per-file-ignores =
     # line too long
-    egs/librispeech/ASR/conformer_ctc/conformer.py: E501,
+    egs/librispeech/ASR/*/conformer.py: E501,
 
 exclude =
   .git,

egs/librispeech/ASR/conformer_mmi_phone/train.py

@@ -161,7 +161,7 @@ def get_params() -> AttributeDict:
             "att_rate": 0,
             "attention_dim": 512,
             "nhead": 8,
-            "num_decoder_layers": 6,
+            "num_decoder_layers": 0,
             "is_espnet_structure": True,
             "use_feat_batchnorm": True,
             "lr_factor": 5.0,

egs/librispeech/ASR/local/convert_transcript_to_corpus.py

@@ -32,10 +32,9 @@ Then the output is
     SPN z o o w o r l d SPN
 """
 
-from pathlib import Path
-from typing import Dict
-
 import argparse
+from pathlib import Path
+from typing import Dict, List
 
 from icefall.lexicon import read_lexicon
 

icefall/mmi.py

@@ -1,4 +1,4 @@
-from typing import List, Union
+from typing import List
 
 import k2
 import torch