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support zero collision tables in ssd operator #4033

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Summary:
X-link: pytorch/torchrec#2919

change list

  1. add bucket concept into ssd tbe
  2. update split_embedding_weights to make it return a tuple of 3 tensors(weight, weight_id, id_cnt_per_bucket)
  3. add new ut for the key value embedding cases

Differential Revision: D73274786

Summary:
X-link: pytorch/torchrec#2919

change list
1. add bucket concept into ssd tbe
2. update split_embedding_weights to make it return a tuple of 3 tensors(weight, weight_id, id_cnt_per_bucket)
3. add new ut for the key value embedding cases

Differential Revision: D73274786
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This pull request was exported from Phabricator. Differential Revision: D73274786

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