correct pickle loading

examples/pybullet/gym/pybullet_envs/deep_mimic/mocap/h36m_dataset.py

@@ -282,9 +282,18 @@ class Human36mDataset(MocapDataset):
         cam['intrinsic'] = np.concatenate((cam['focal_length'], cam['center'],
                                            cam['radial_distortion'], cam['tangential_distortion']))
 
+    # save np.load
+    np_load_old = np.load
+
+    # modify the default parameters of np.load
+    np.load = lambda *a,**k: np_load_old(*a, allow_pickle=True, **k)
+
     # Load serialized dataset
     data = np.load(path)['positions_3d'].item()
 
+    # restore np.load for future normal usage
+    np.load = np_load_old
+
     self._data = {}
     for subject, actions in data.items():
       self._data[subject] = {}