[torch.compile] transparent compilation with more logging

[youkaichao]

In preparation for torch.compile documentation, I added the following logging information:

• which function we are compiling:
  • INFO 01-20 22:10:00 decorators.py:201] Start compiling function <code object forward at 0x7f6ea4f85580, file "/data/youkaichao/vllm/vllm/model_executor/models/llama.py", line 343>
• how Dynamo transforms the function:
  • INFO 01-20 21:59:30 wrapper.py:101] Dynamo transformed code saved to /home/eecs/youkaichao/.cache/vllm/torch_compile_cache/bef6c83c36/rank_0/transformed_code.py
• The computation graph (after potential splitting)
  • INFO 01-20 22:04:08 backends.py:628] Computation graph saved to /home/eecs/youkaichao/.cache/vllm/torch_compile_cache/bef6c83c36/rank_0/computation_graph.py

The following information is already available after #12182

• Inductor compiled Python callable function
  • /home/eecs/youkaichao/.cache/vllm/torch_compile_cache/bef6c83c36/rank_0/inductor_hash_cache.py

[github-actions]

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[heheda12345]

LGTM. But I think we do not need to use logger.info for the internal steps of torch.compile.

[heheda12345]

I think we do not need logger.info here, as most users do not need to be aware of this step. The file structure in local_cache_dir can be explained in the document.

[youkaichao]

thanks for the suggestion! moved to debug instead.

[heheda12345]

The same as above.

[youkaichao]

fixed in fd753d1

[heheda12345]

Great job!

[youkaichao]

failing tests are not related (amd machine issue), merging