[7/N] Nnapi backend delegation preprocess: compile_spec sanity check (#62213)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62213
Added sanity checks in preprocess function for Android NNAPI delegate.
`preprocess()` requires some input metadata passed through its `method_compile_spec` function argument.
`preprocess()` now throws specific error messages, if it cannot find the correct input arguments.
Example error message:
```
RuntimeError: method_compile_spec does not contain the "forward" key.
method_compile_spec should contain a Tensor or Tensor List which bundles input parameters: shape, dtype, quantization, and dimorder.
For input shapes, use 0 for run/load time flexible input.
method_compile_spec must use the following format: {"forward": {"inputs": at::Tensor}} OR {"forward": {"inputs": c10::List<at::Tensor>}}
```
nnapi_backend_preprocess.cpp: contains sanity check implementation
test_backend_nnapi.py: sanity check unit tests
Test: Ran `python test/test_jit.py TestNnapiBackend` in OSS successfully.
TODO: Using Tensors to pass input parameters is a temporary hack. When a dedicated object is implemented, update the sanity check error message.
ghstack-source-id: 134339282
Test Plan: Ran `python test/test_jit.py TestNnapiBackend` in OSS successfully.
Reviewed By: raziel, iseeyuan
Differential Revision: D29917004
fbshipit-source-id: 0d5c6b35889c556cda905ffc29c25c5422ae9ee4
