[WIP][dynamo] simplify module_key creation logic (#94945)
After some thoughts, I find it difficult to come up with a robust naming convention that satisfies the following constraints at the same time: 1. the new name should be a valid nn.Moule attribute (as required by minifier and it's a good thing to have in general) 2. it can cover various cases such as GetItemSource, GetAttrSource 3. it's easy to recover the original path 4. robust to users' naming scheme.
Thanks to @yanboliang for pointing out the original access path is preserved in Source, now we just need to add an additonal value source.name() to node.meta["nn_module_stack"] to get the access path in original module.
We also address some TODO in quantization, which relies on the original naming convention in nn_module_stack.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/94945
Approved by: https://github.com/jansel, https://github.com/yanboliang
