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Make dict update fx compatible #2766

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Summary:
Dict's update method cannot be supported by fx:

NotImplementedError: 'immutable_dict' object does not support mutation. If you are attempting to modify the kwargs or args of a torch.fx.Node object,

It needs to be handled for every key-value pair.

Not 100% sure why this issue was not surfaced before. But likely it is because we have never published a model with more than one MPZCH-powered embedding table, so the code path was not hit before.

Differential Revision: D70227971

Summary:
Dict's `update` method cannot be supported by *fx*:
```
NotImplementedError: 'immutable_dict' object does not support mutation. If you are attempting to modify the kwargs or args of a torch.fx.Node object,
```

It needs to be handled for every key-value pair.

Not 100% sure why this issue was not surfaced before. But likely it is because we have never published a model with more than one MPZCH-powered embedding table, so the code path was not hit before.

Differential Revision: D70227971
@facebook-github-bot facebook-github-bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Feb 26, 2025
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This pull request was exported from Phabricator. Differential Revision: D70227971

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