diff --git a/examples/tsm/kinetics_dataset.py b/examples/tsm/kinetics_dataset.py
index c8570018cfbcf808917f28806ab841da874782d3..123d89814a8c631569cd0503750cafac631cca22 100644
--- a/examples/tsm/kinetics_dataset.py
+++ b/examples/tsm/kinetics_dataset.py
@@ -100,19 +100,12 @@ class KineticsDataset(Dataset):
     def __getitem__(self, idx):
         pickle_path = os.path.join(self.pickle_dir, self.pickle_paths[idx])
 
-        try:
-            if six.PY2:
-                data = pickle.load(open(pickle_path, 'rb'))
-            else:
-                data = pickle.load(open(pickle_path, 'rb'), encoding='bytes')
-
-            vid, label, frames = data
-            if len(frames) < 1:
-                logger.error("{} contains no frame".format(pickle_path))
-                sys.exit(-1)
-        except Exception as e:
-            logger.error("Load {} failed: {}".format(pickle_path, e))
-            sys.exit(-1)
+        if six.PY2:
+            data = pickle.load(open(pickle_path, 'rb'))
+        else:
+            data = pickle.load(open(pickle_path, 'rb'), encoding='bytes')
+
+        vid, label, frames = data
 
         if self.label_list is not None:
             label = self.label_list.index(label)
diff --git a/hapi/datasets/coco.py b/hapi/datasets/coco.py
index f1ab97281a6e0e20834c33f1e6663903f25349a0..50d31cff06692e30fb153983023d4c8ed7476f2c 100644
--- a/hapi/datasets/coco.py
+++ b/hapi/datasets/coco.py
@@ -18,7 +18,6 @@ from __future__ import print_function
 import os
 import cv2
 import numpy as np
-from pycocotools.coco import COCO
 
 from paddle.io import Dataset
 
@@ -91,6 +90,7 @@ class COCODataset(Dataset):
         self._load_roidb_and_cname2cid()
 
     def _load_roidb_and_cname2cid(self):
+        from pycocotools.coco import COCO
         assert self._anno_path.endswith('.json'), \
             'invalid coco annotation file: ' + anno_path
         coco = COCO(self._anno_path)
diff --git a/hapi/model.py b/hapi/model.py
index f4e6744df5107d345c873f6fa45269f704615708..ed891f58a95f399d02475bfec16c53d9c82e8422 100644
--- a/hapi/model.py
+++ b/hapi/model.py
@@ -798,12 +798,12 @@ class Model(fluid.dygraph.Layer):
                     "{} receives a shape {}, but the expected shape is {}.".
                     format(key, list(state.shape), list(param.shape)))
             return param, state
-
-	def _strip_postfix(path):
-	    path, ext = os.path.splitext(path)
-	    assert ext in ['', '.pdparams', '.pdopt', '.pdmodel'], \
-		    "Unknown postfix {} from weights".format(ext)
-	    return path
+        
+        def _strip_postfix(path):
+            path, ext = os.path.splitext(path)
+            assert ext in ['', '.pdparams', '.pdopt', '.pdmodel'], \
+                    "Unknown postfix {} from weights".format(ext)
+            return path
 
         path = _strip_postfix(path)
         param_state = _load_state_from_path(path + ".pdparams")