Read max context length from the correct ModelArgs field

[sxu]

Summary: We should read from max_context_len for RoPE, max_seq_len represents input sequence length.

Differential Revision: D84182698

[pytorch-bot]

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❌ 2 New Failures, 6 Cancelled Jobs

As of commit 4000264 with merge base c62cbfe ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2c7c064963feadd6b0f9c9f4b4bd09be6466858843dd5922542b1e844f62ec48 /exec failed with exit code 1
• Test CUDA Builds / test-voxtral-cuda-e2e / linux-job (gh)
  RuntimeError: Command docker exec -t e234a7db5641d4c501652dc542f037981e74bb35bd6ae95dcce5729f9ba98f8b /exec failed with exit code 2

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

• periodic / test-models-linux (buck2, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, vit, portable, linux.2xlarge, 90) / linux-job (gh)
• periodic / test-models-linux (cmake, vit, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)

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[meta-codesync]

@sxu has exported this pull request. If you are a Meta employee, you can view the originating Diff in D84182698.