Make EmbeddingLookup APIs take offsets rather than lengths to match the PyTorch's EmbeddingBag (#24944)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/24944
As Title says, we would like to make the EmbeddingLookup APIs take offsets rather than lengths to match the PyTorch's EmbeddingBag.
ghstack-source-id: 88883902
Test Plan:
python hp_emblookup_codegen.py --use-offsets
Check the benchmark in D16990830.
Reviewed By: jspark1105
Differential Revision: D16924271
fbshipit-source-id: 7fac640c8587db59fd2304bb8e8d63c413f27cb8
