pytorch

a0a23c6e - [bazel] make it possible to build the whole world, update CI (#78870)

[bazel] make it possible to build the whole world, update CI (#78870) Fixes https://github.com/pytorch/pytorch/issues/77509 This PR supersedes https://github.com/pytorch/pytorch/pull/77510. It allows both `bazel query //...` and `bazel build --config=gpu //...` to work. Concretely the changes are: 1. Add "GenerateAten" mnemonic -- this is a convenience thing, so anybody who uses [Remote Execution](https://bazel.build/docs/remote-execution) can add a ``` build:rbe --strategy=GenerateAten=sandboxed,local ``` line to the `~/.bazelrc` and build this action locally (it doesn't have hermetic dependencies at the moment). 2. Replaced few `http_archive` repos by the proper existing submodules to avoid code drift. 3. Updated `pybind11_bazel` and added `python_version="3"` to `python_configure`. This prevents hard-to-debug error that are caused by an attempt to build with python2 on the systems where it's a default python (Ubuntu 18.04 for example). 4. Added `unused_` repos, they purpose is to hide the unwanted submodules of submodules that often have bazel targets in them. 5. Updated CI to build //... -- this is a great step forward to prevent regressions in targets not only in the top-level BUILD.bazel file, but in other folders too. 6. Switch default bazel build to use gpu support. Pull Request resolved: https://github.com/pytorch/pytorch/pull/78870 Approved by: https://github.com/ezyang