Make the exception raised from "numpy.dtype(numpy.void, (INT,))" less cryptic (#16809)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16809
https://fb.facebook.com/groups/582508038765902/permalink/736710343345670/?comment_id=824042307945806&reply_comment_id=824318864584817
numpy.dtype(numpy.void, (<INT>, )) raises a cryptic message "invalid itemsize in generic type tuple" that is hard to debug.
This diff adds the message to ask the user to investigate the error causing blob.
Reviewed By: kennyhorror
Differential Revision: D13973359
fbshipit-source-id: 43a0c492ffafbabdfd7f7541c08a258e5ac0280f
