[package] Add an intern keyword (#57341)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57341
Require that users be explicit about what they are going to be
interning. There are a lot of changes that are enabled by this. The new
overall scheme is:
PackageExporter maintains a dependency graph. Users can add to it,
either explicitly (by issuing a `save_*` call) or explicitly (through
dependency resolution). Users can also specify what action to take when
PackageExporter encounters a module (deny, intern, mock, extern).
Nothing (except pickles, tho that can be changed with a small amount
of work) is written to the zip archive until we are finalizing the
package. At that point, we consult the dependency graph and write out
the package exactly as it tells us to.
This accomplishes two things:
1. We can gather up *all* packaging errors instead of showing them one at a time.
2. We require that users be explicit about what's going in packages, which is a common request.
Differential Revision: D28114185
Test Plan: Imported from OSS
Reviewed By: SplitInfinity
Pulled By: suo
fbshipit-source-id: fa1abf1c26be42b14c7e7cf3403ecf336ad4fc12
