File "/n/home10/ywang123/anaconda3/envs/tensorflow/lib/python3.5/site-packages/h5py/_hl/group.py", line 323, in __iter__

    for x in self.id.__iter__():

  File "h5py/h5g.pyx", line 472, in h5py.h5g.GroupID.__iter__

  File "h5py/h5g.pyx", line 473, in h5py.h5g.GroupID.__iter__

  File "h5py/h5g.pyx", line 100, in h5py.h5g.GroupIter.__init__

  File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper

  File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper

  File "h5py/h5g.pyx", line 331, in h5py.h5g.GroupID.get_num_objs

ValueError: Not a location id (invalid object ID)