add embedding bag skeleton take 2 (#61126)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61126
adding skeleton implementations of quantized embedding tables with zeroes
Test Plan:
compilation, farm test, and ran test_find_dangling_impls and passed
did a manual negative test and verified the message is printed properly
```
======================================================================
FAIL: test_find_dangling_impls (test_dispatch.TestPythonDispatcher)
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Traceback (most recent call last):
File "/data/users/hyz/fbsource/fbcode/buck-out/opt/gen/caffe2/test/others#binary,link-tree/test_dispatch.py", line 892, in test_find_dangling_impls
self.assertEqual(
File "/data/users/hyz/fbsource/fbcode/buck-out/opt/gen/caffe2/test/others#binary,link-tree/torch/testing/_internal/common_utils.py", line 1498, in assertEqual
super().assertTrue(result, msg=self._get_assert_msg(msg, debug_msg=debug_msg))
AssertionError: False is not true : Scalars failed to compare as equal! 0 != 1
Expect zero dangling impls, but found: ['name: quantized::qembedding_bag_4bit_unpack\nschema: (none)\nCUDA: registered at caffe2/aten/src/ATen/native/quantized/cuda/embedding_bag.cu:394 :: (Tensor _0) -> (Tensor _0) [ boxed unboxed ]\n']
Reviewed By: walterddr
Differential Revision: D29518274
fbshipit-source-id: d0cb81c8bf51cdc4b83038758131ccf61e4360f5
