So many conflict of module.

I got an error below.
`from net.lib.utils.bbox import bbox_overlaps as box_overlaps
  File "__init__.pxd", line 872, in init utils.bbox
ValueError: numpy.ufunc has the wrong size, try recompiling. Expected 192, got 216`

so many conflict of numpy opencv and others.

Can you tell me pre-requisite module before `train.py`

Thanks.