Improve documentation and warning message for creation of a tensor with from_numpy() (#49516)
Summary:
Implements very simple changes suggested in the short discussion of the issue. Updated documentation to inform user that creation of tensor with memory mapped read only numpy arrays will probably cause a crash of the program. The displayed warning message was also updated to contain the information about issues concerning the use of a memory mapped read only numpy array. Closes https://github.com/pytorch/pytorch/issues/46741.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49516
Reviewed By: mrshenli
Differential Revision: D25746115
Pulled By: mruberry
fbshipit-source-id: 3e534a8f2bc1f083a2835440d324bd6f30798ad4
