pytorch

8c04593c - [PyTorch Edge] Add backport to export old bytecode models (#56802)

[PyTorch Edge] Add backport to export old bytecode models (#56802) Summary: Add an api to backport a model vn to model vi. It accept an input model (file or buffer) and output a model (file or buffer) with an expected bytecode version. In this change, the input is a model and it can come from a file or buffer. The output is a model and can be either file path or buffer. When backport fails, function return false with a warning message : ``` /Users/chenlai/pytorch/cmake-build-debug/bin/test_jit --gtest_filter=LiteInterpreterTest.BackPortByteCodeModelV4:LiteInterpreterTest/*.BackPortByteCodeModelV4:*/LiteInterpreterTest.BackPortByteCodeModelV4/*:*/LiteInterpreterTest/*.BackPortByteCodeModelV4 --gtest_color=no Testing started at 2:32 PM ... CUDA not available. Disabling CUDA and MultiCUDA tests [W backport.cpp:419] Warning: Backport doesn't support backport to version3 (function _backport_for_mobile_impl) Process finished with exit code 0 ``` ## Test 1. Run both `caffe2/test/cpp/jit/test_lite_interpreter.cpp` and `caffe2/test/mobile/test_bytecode.py`. 2. Run all prod models with backport api. Pull Request resolved: https://github.com/pytorch/pytorch/pull/56802 ghstack-source-id: 128425510 Test Plan: CI Reviewed By: raziel, iseeyuan Differential Revision: D27844651 fbshipit-source-id: 8a803cf6c76433ee0a3049b1a5570585d569f8d6