Fix: Attach _linear_extra_repr to quantized linear layers

[Mirza-Samad-Ahmed-Baig]

I've made changes to resolve the AttributeError: 'Linear' object has no attribute '_linear_extra_repr' during quantization by adding necessary imports—import types and from torchao.quantization.quant_api import _linear_extra_repr—to torchchat/utils/quantize.py, enabling dynamic method attachment and access to _linear_extra_repr. Additionally, I modified the quantize_model function by introducing a recursive helper function _attach_extra_repr within the same file. This function traverses all modules in the model and, for each nn.Linear module missing the extra_repr attribute, dynamically attaches _linear_extra_repr using types.MethodType. The helper is invoked at the beginning of quantize_model to ensure all nn.Linear modules have the extra_repr method before quantization begins.

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❌ 13 New Failures, 3 Cancelled Jobs

As of commit 8e14b2c with merge base 71552fd ():

NEW FAILURES - The following jobs have failed:

• pull / runner-aoti (16-core-ubuntu) (gh)
  Process completed with exit code 1.
• pull / runner-et (16-core-ubuntu) (gh)
  Process completed with exit code 1.
• pull / test-build-runner-et-android / linux-job (gh)
  RuntimeError: Command docker exec -t 2d803c514529adbb648c8b7260f5e5b905924c9825209b873d1cbd724be5bee1 /exec failed with exit code 1
• pull / test-gpu-aoti-bfloat16 (cuda, stories15M) / linux-job (gh)
  RuntimeError: Command docker exec -t 63f59a4d0cb39ce44ce4e2bb4b39fe1367e148c48f04fc70af6ca83f4d27e1f1 /exec failed with exit code 1
• pull / test-gpu-aoti-float16 (cuda, stories15M) / linux-job (gh)
  RuntimeError: Command docker exec -t 6253882fc3fecaced5a77340d18757bc40480358b3bc1d2d99aabb4ce2a72129 /exec failed with exit code 1
• pull / test-gpu-aoti-float32 (cuda, stories15M) / linux-job (gh)
  RuntimeError: Command docker exec -t 53575089c9f4ebade2f3a717dde106ccd72bc6e43796d894259ae84e8068fff0 /exec failed with exit code 1
• pull / test-gpu-compile (cuda, stories15M) / linux-job (gh)
  RuntimeError: Command docker exec -t 0a5852fc92b290666f5a4cd79268560fe17d084ac4526349c3fec409411356a9 /exec failed with exit code 1
• pull / test-gpu-eval-sanity-check (cuda, stories15M) / linux-job (gh)
  RuntimeError: Command docker exec -t 95ce01bab4b2d479d6cd0c315558ee602e198f1aaecfee087c795b8b0e1b524f /exec failed with exit code 1
• pull / test-tinystories-executorch (16-core-ubuntu) (gh)
  Process completed with exit code 1.
• pull / test-torchao-experimental-et (macos-14-xlarge) (gh)
  ninja: build stopped: subcommand failed
• Run parallel prefill / test-cuda / linux-job (gh)
  RuntimeError: Command docker exec -t 51c55426160bda85e138fd9a78e2e09303100f2e009a9b1b9a2d96931c978d40 /exec failed with exit code 1
• Run parallel prefill / test-sdpa-backends-export / linux-job (gh)
  RuntimeError: Command docker exec -t 0712617c90971fc287e270a98c6e34614ea88823b514d06f502df5f5e1dd19e5 /exec failed with exit code 1
• Run the aoti runner with CUDA using stories / test-runner-aot-cuda / linux-job (gh)
  RuntimeError: Command docker exec -t 49168ae702e2d065cf8dfbcc3f7c7bff3adca4ebf184ec373648ea8e27b36619 /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / runner-aoti (macos-14-xlarge) (gh)
  ##[error]The operation was canceled.
• pull / runner-et (macos-14-xlarge) (gh)
  ##[error]The operation was canceled.
• pull / test-tinystories-executorch (macos-14-xlarge) (gh)
  ##[error]The operation was canceled.

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