fix a ut bug

tests/trainers/test_ofa_trainer.py

@@ -79,7 +79,7 @@ class TestOfaTrainer(unittest.TestCase):
         with open(config_file, 'w') as writer:
             json.dump(self.finetune_cfg, writer)
 
-        pretrained_model = 'damo/ofa_image-caption_coco_large_en'
+        pretrained_model = 'damo/ofa_image-caption_coco_distilled_en'
         args = dict(
             model=pretrained_model,
             work_dir=WORKSPACE,
@@ -97,8 +97,8 @@ class TestOfaTrainer(unittest.TestCase):
         trainer.train()
 
         self.assertIn(ModelFile.TORCH_MODEL_BIN_FILE,
-                      os.path.join(WORKSPACE, 'output'))
-        shutil.rmtree(WORKSPACE)
+                      os.listdir(os.path.join(WORKSPACE, 'output')))
+        # shutil.rmtree(WORKSPACE)
 
 
 if __name__ == '__main__':