fix unit test

tests/unit/asr/deepspeech2_online_model_test.py

@@ -191,7 +191,8 @@ class TestDeepSpeech2StaticModelOnline(unittest.TestCase):
     
     def setUp(self):
         export_prefix = "exp/deepspeech2_online/checkpoints/test_export"
-        os.makedirs( os.path.dirname(export_prefix), mode=0o755)
+        if not os.path.exists(os.path.dirname(export_prefix)):
+            os.makedirs(os.path.dirname(export_prefix), mode=0o755)
         infer_model =  DeepSpeech2InferModelOnline(
             feat_size=161,
             dict_size=4233,

tests/unit/asr/deepspeech2_online_model_test.sh

+mkdir -p test_data
+wget -P test_data https://paddlespeech.bj.bcebos.com/datasets/unit_test/asr/static_ds2online_inputs.pickle
+python deepspeech2_online_model_test.py