diff --git a/paddlespeech/__init__.py b/paddlespeech/__init__.py
index 969d189f5..12e763e99 100644
--- a/paddlespeech/__init__.py
+++ b/paddlespeech/__init__.py
@@ -14,6 +14,4 @@
 import _locale
 _locale._getdefaultlocale = (lambda *args: ['en_US', 'utf8'])
 
-__version__ = '0.0.0'
 
-__commit__ = '9cf8c1985a98bb380c183116123672976bdfe5c9'
diff --git a/paddlespeech/audiotools/core/util.py b/paddlespeech/audiotools/core/util.py
index fefc03f7a..f53321489 100644
--- a/paddlespeech/audiotools/core/util.py
+++ b/paddlespeech/audiotools/core/util.py
@@ -801,6 +801,7 @@ def collate(list_of_dicts: list, n_splits: int=None):
         batch = {}
         for k, v in dict_of_lists.items():
             if isinstance(v, list):
+                from .audio_signal import AudioSignal
                 if all(isinstance(s, AudioSignal) for s in v):
                     batch[k] = AudioSignal.batch(v, pad_signals=True)
                 else:
diff --git a/tests/unit/audiotools/core/test_util.py b/tests/unit/audiotools/core/test_util.py
index 155686acd..16e5d5e92 100644
--- a/tests/unit/audiotools/core/test_util.py
+++ b/tests/unit/audiotools/core/test_util.py
@@ -13,7 +13,6 @@ import pytest
 
 from paddlespeech.audiotools import util
 from paddlespeech.audiotools.core.audio_signal import AudioSignal
-from paddlespeech.vector.training.seeding import seed_everything
 
 
 def test_check_random_state():
@@ -36,12 +35,12 @@ def test_check_random_state():
 
 
 def test_seed():
-    seed_everything(0)
+    util.seed_everything(0)
     paddle_result_a = paddle.randn([1])
     np_result_a = np.random.randn(1)
     py_result_a = random.random()
 
-    seed_everything(0)
+    util.seed_everything(0)
     paddle_result_b = paddle.randn([1])
     np_result_b = np.random.randn(1)
     py_result_b = random.random()