utils.load stacktrace excerpt

  File "/home/mwchase/comparison/pyro_getter.py", line 26, in getfile
    return pyro.utils.load(self.dir.format(**kwargs))
  File "/home/mwchase/.local/lib/python2.6/site-packages/pyro/utils.py", line 61, in load
    return HDFStruct(filename)
  File "/home/mwchase/.local/lib/python2.6/site-packages/pyro/utils.py", line 55, in __init__
    data = h5py.File(filename)
  File "/usr/lib/python2.6/dist-packages/h5py/highlevel.py", line 636, in __init__
    self.fid = h5f.create(name, h5f.ACC_EXCL, fapl=plist)
  File "/usr/lib/python2.6/dist-packages/h5py/_sync.py", line 88, in wrap
    return func(*args, **kwds)
  File "h5f.pyx", line 96, in h5py.h5f.create (h5py/h5f.c:1394)
h5py._stub.IOError: File exists (Internal error (too specific to document in detail): System error message)