Remove more unused classes

Summary:
Removes three unused classes:

- `InferCPUGroupedEmbeddingsLookup`

Reviewed By: PaulZhang12

Differential Revision: D67153268

torchrec/distributed/embedding_lookup.py

@@ -1101,36 +1101,3 @@ def get_tbes_to_register(
         self,
     ) -> Dict[IntNBitTableBatchedEmbeddingBagsCodegen, GroupedEmbeddingConfig]:
         return get_tbes_to_register_from_iterable(self._embedding_lookups_per_rank)
-
-
-class InferCPUGroupedEmbeddingsLookup(
-    InferGroupedLookupMixin,
-    BaseEmbeddingLookup[InputDistOutputs, List[torch.Tensor]],
-    TBEToRegisterMixIn,
-):
-    def __init__(
-        self,
-        grouped_configs_per_rank: List[List[GroupedEmbeddingConfig]],
-        world_size: int,
-        fused_params: Optional[Dict[str, Any]] = None,
-        device: Optional[torch.device] = None,
-    ) -> None:
-        super().__init__()
-        self._embedding_lookups_per_rank: List[MetaInferGroupedEmbeddingsLookup] = []
-
-        device_type: str = "cpu" if device is None else device.type
-        for rank in range(world_size):
-            self._embedding_lookups_per_rank.append(
-                MetaInferGroupedEmbeddingsLookup(
-                    grouped_configs=grouped_configs_per_rank[rank],
-                    # syntax for torchscript
-                    # pyre-fixme[20]: Argument `index` expected.
-                    device=torch.device(type=device_type),
-                    fused_params=fused_params,
-                )
-            )
-
-    def get_tbes_to_register(
-        self,
-    ) -> Dict[IntNBitTableBatchedEmbeddingBagsCodegen, GroupedEmbeddingConfig]:
-        return get_tbes_to_register_from_iterable(self._embedding_lookups_per_rank)