Concatenate directly into shared memory when constructing batches for numpy (#14534)
Summary:
Since #1323 tensors are shared with shared memory, but this feature is not active for numpy.
This PR fix this.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/14534
Differential Revision: D13561649
Pulled By: soumith
fbshipit-source-id: b6bc9e99fb91e8b675c2ef131fba9fa11c1647c0
