Add unsloth eval CLI command#6824
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Redirect stdout/stderr at the file-descriptor level only; never reassign or close the Python stream objects, since lm-eval's logger keeps a reference and would write to a closed file (ValueError: I/O operation on closed file), which also broke suppression.
… stdio rich's console.status() backs onto Live with redirect_stdout/stderr=True, which on a real terminal swaps sys.stdout/stderr to proxies pointing at the console. lm-eval's tqdm(file=sys.stderr) created during the eval then wrote straight to the terminal, escaping the fd-level redirect (only visible on a TTY, not when piped). Drive the spinner with Live(redirect_stdout=False, redirect_stderr=False) so the streams stay on the redirected fds.
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Code Review
This pull request introduces a new evaluation command (unsloth eval) to the CLI, allowing users to evaluate checkpoints or LoRA adapters using lm-eval-harness. It adds the necessary dependencies, installation logic, CLI routing, evaluation implementation, and corresponding unit tests. The review feedback focuses on improving robustness, specifically by explicitly passing max_length to HFLM to avoid out-of-memory errors, and adding defensive checks and error handling when parsing JSON and YAML configuration files.
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Adds unsloth eval so users can benchmark a checkpoint or LoRA adapter with lm-eval-harness (https://github.com/EleutherAI/lm-evaluation-harness) from the CLI.