pytorch

b3317523 - [Quant] Implemented 4 bit embedding op support; added corresponding test case (#69768)

[Quant] Implemented 4 bit embedding op support; added corresponding test case (#69768) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/69768 Support for the 4 embedding operator has been added. The support is analogous to the preexisting support for byte/8bit embedding. A corresponding test case was added to test_quantized_embedding_op.py Test Plan: In pytorch main dir, execute ``` python test/test_quantization.py TestStaticQuantizedModule.test_embedding_api ``` to run the series of tests, including the newly added test_embedding_4bit function Imported from OSS Reviewed By: jbschlosser Differential Revision: D33152673 fbshipit-source-id: bdcc2eb2e37de38fda3461ff3ebf1d2fb5e58071