[FSDP][Easy] Allow ModuleWrapPolicy to take Iterable
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/104999
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ghstack-source-id: 6e56f5c32da86336e4a943a49f237d448c532cad Pull Request resolved: pytorch#104999
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…104969) This does some code organization improvement. - It renames `_FSDPPolicy` to `_Policy` to show that it is not only for FSDP but for any module-level API. - It formalizes the contract that such a policy should return something like `target_module_to_kwargs: Dict[nn.Module, Dict[str, Any]]` that maps each module to wrap to its kwargs. It does so by requiring a `_run_policy` abstract method (this time private since users do not need to care about it). Then, our auto wrapping can just call `_run_policy()` to generate the dict and do any validation or post-processing. This PR is technically BC-breaking because it removes the public `ModuleWrapPolicy.policy`. However, I do not think anyone was using that anyway, so this is a pretty safe breakage. Pull Request resolved: #104969 Approved by: https://github.com/rohan-varma ghstack dependencies: #104427, #104967, #104999
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This PR adds a new `CustomPolicy` that acts like the existing `lambda_auto_wrap_policy` except it (1) leverages the new auto wrapping infrastructure and (2) allows overriding FSDP kwargs for particular instances. (1) gives it access to the validation checks (like for frozen parameters), and (2) makes it as expressive as manual wrapping. This should allow us to effectively deprecate manual wrapping if desired.
The API is as follows:
```
def lambda_fn(module: nn.Module) -> Union[bool, Dict[str, Any]]:
...
policy = CustomPolicy(lambda_fn)
```
The `lambda_fn` can return:
- `False` or `{}` to indicate no wrapping
- `True` to indicate wrapping while inheriting the root's FSDP kwargs
- Non-empty `dict` to indicate wrapping while overriding the specified FSDP kwargs and inheriting the rest from the root
---
After this PR, the follow-up work items for auto wrapping are:
1. Add shared parameter validation
2. (Longer-term / exploratory) Add a policy that provides a reasonable auto wrapping with "minimal" user input
Pull Request resolved: #104986
Approved by: https://github.com/ezyang
ghstack dependencies: #104427, #104967, #104999, #104969
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Stack from ghstack (oldest at bottom):
CustomPolicy#104986_FSDPPolicy.policywith_Policy._run_policy#104969ModuleWrapPolicyto takeIterable#104999ModuleWrapPolicy#104427