fix codestyle

paddlespeech/__init__.py

@@ -13,4 +13,3 @@
 # limitations under the License.
 import _locale
 _locale._getdefaultlocale = (lambda *args: ['en_US', 'utf8'])
-

paddlespeech/audiotools/core/util.py

@@ -231,6 +231,7 @@ def ensure_tensor(
 
 def _get_value(other):
     # 
+    from .audio_signal import AudioSignal
     if isinstance(other, AudioSignal):
         return other.audio_data
     return other
@@ -781,6 +782,8 @@ def collate(list_of_dicts: list, n_splits: int=None):
         Dictionary containing batched data.
     """
 
+    from .audio_signal import AudioSignal
+
     batches = []
     list_len = len(list_of_dicts)
 
@@ -870,6 +873,7 @@ def generate_chord_dataset(
 
     """
     import librosa
+    from .audio_signal import AudioSignal
     from ..data.preprocess import create_csv
 
     min_midi = librosa.note_to_midi(min_note)