diff --git a/egs/aishell/ASR/conformer_mmi/decode.py b/egs/aishell/ASR/conformer_mmi/decode.py
index a80717b75..164d86c4c 100755
--- a/egs/aishell/ASR/conformer_mmi/decode.py
+++ b/egs/aishell/ASR/conformer_mmi/decode.py
@@ -28,7 +28,6 @@ import torch.nn as nn
 from asr_datamodule import AishellAsrDataModule
 from conformer import Conformer
 
-from icefall.bpe_graph_compiler import BpeCtcTrainingGraphCompiler
 from icefall.checkpoint import average_checkpoints, load_checkpoint
 from icefall.decode import (
     get_lattice,
diff --git a/egs/aishell/ASR/conformer_mmi/train.py b/egs/aishell/ASR/conformer_mmi/train.py
index 8ecac7863..1ff3e2c3b 100755
--- a/egs/aishell/ASR/conformer_mmi/train.py
+++ b/egs/aishell/ASR/conformer_mmi/train.py
@@ -21,7 +21,7 @@ import argparse
 import logging
 from pathlib import Path
 from shutil import copyfile
-from typing import Dict, Optional, Tuple
+from typing import Optional, Tuple
 
 import k2
 import torch