tree f9892f6d55c79e65b40ba1da909779f355fb60f7
parent 148e90ba2aea9b30654fe8a6967d29958090310f
author Brian Vaughan <bvaughan@fb.com> 1557500266 -0700
committer Facebook Github Bot <facebook-github-bot@users.noreply.github.com> 1557500455 -0700

Sparse half embeddings on cuda (#19695)

Summary:
```
import torch
a = torch.nn.Embedding(3, 4, sparse=True).half().cuda()
a(torch.LongTensor([1, 0]).cuda()).sum().backward()

```
gave: `RuntimeError: torch.cuda.sparse.HalfTensor is not enabled`

This PR enables sparse.HalfTensor on cuda. Still won't work for CPU.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19695

Differential Revision: D15281162

Pulled By: nairbv

fbshipit-source-id: 0d83d946a059393bd53d8b8102e2daa9b4c02588