diff --git a/egs/librispeech/ASR/pruned_transducer_stateless7/export-onnx.py b/egs/librispeech/ASR/pruned_transducer_stateless7/export-onnx.py
index f799f67f6..eee548976 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless7/export-onnx.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless7/export-onnx.py
@@ -50,7 +50,6 @@ import argparse
 import logging
 from pathlib import Path
 from typing import Dict, Tuple
-import re
 
 import k2
 import onnx
@@ -68,7 +67,7 @@ from icefall.checkpoint import (
     find_checkpoints,
     load_checkpoint,
 )
-from icefall.utils import setup_logger, str2bool, num_tokens
+from icefall.utils import num_tokens, setup_logger, str2bool
 
 
 def get_parser():
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless7/export.py b/egs/librispeech/ASR/pruned_transducer_stateless7/export.py
index d186441fd..eb4c4d282 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless7/export.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless7/export.py
@@ -86,7 +86,6 @@ with the following commands:
 import argparse
 import logging
 from pathlib import Path
-import re
 
 import k2
 import torch
@@ -100,7 +99,7 @@ from icefall.checkpoint import (
     find_checkpoints,
     load_checkpoint,
 )
-from icefall.utils import str2bool, num_tokens
+from icefall.utils import num_tokens, str2bool
 
 
 def get_parser():
diff --git a/egs/librispeech/ASR/zipformer/export-onnx-streaming.py b/egs/librispeech/ASR/zipformer/export-onnx-streaming.py
index ff3e46433..8d4e003d4 100755
--- a/egs/librispeech/ASR/zipformer/export-onnx-streaming.py
+++ b/egs/librispeech/ASR/zipformer/export-onnx-streaming.py
@@ -74,7 +74,6 @@ import onnx
 import torch
 import torch.nn as nn
 from decoder import Decoder
-from export import num_tokens
 from onnxruntime.quantization import QuantType, quantize_dynamic
 from scaling_converter import convert_scaled_to_non_scaled
 from train import add_model_arguments, get_model, get_params
@@ -86,7 +85,7 @@ from icefall.checkpoint import (
     find_checkpoints,
     load_checkpoint,
 )
-from icefall.utils import str2bool
+from icefall.utils import num_tokens, str2bool
 
 
 def get_parser():
diff --git a/egs/librispeech/ASR/zipformer/export-onnx.py b/egs/librispeech/ASR/zipformer/export-onnx.py
index 1bc10c896..cb7f8f0df 100755
--- a/egs/librispeech/ASR/zipformer/export-onnx.py
+++ b/egs/librispeech/ASR/zipformer/export-onnx.py
@@ -71,7 +71,6 @@ import onnx
 import torch
 import torch.nn as nn
 from decoder import Decoder
-from export import num_tokens
 from onnxruntime.quantization import QuantType, quantize_dynamic
 from scaling_converter import convert_scaled_to_non_scaled
 from train import add_model_arguments, get_model, get_params
@@ -83,7 +82,7 @@ from icefall.checkpoint import (
     find_checkpoints,
     load_checkpoint,
 )
-from icefall.utils import make_pad_mask, str2bool
+from icefall.utils import make_pad_mask, num_tokens, str2bool
 
 
 def get_parser():
diff --git a/egs/librispeech/ASR/zipformer/export.py b/egs/librispeech/ASR/zipformer/export.py
index dd1d21ef4..dcd074852 100755
--- a/egs/librispeech/ASR/zipformer/export.py
+++ b/egs/librispeech/ASR/zipformer/export.py
@@ -160,7 +160,6 @@ with the following commands:
 
 import argparse
 import logging
-import re
 from pathlib import Path
 from typing import List, Tuple
 
@@ -176,7 +175,7 @@ from icefall.checkpoint import (
     find_checkpoints,
     load_checkpoint,
 )
-from icefall.utils import make_pad_mask, str2bool, num_tokens
+from icefall.utils import make_pad_mask, num_tokens, str2bool
 
 
 def get_parser():