[Feature]: Enable setting `leave=False` in `tqdm` progress bars

[saattrupdan]

🚀 The feature, motivation and pitch

In my use case I'm running many offline evaluations of models, so the terminal quickly gets cluttered with vLLM progress bars. This is due to the progress bar in the LLM._run_engine method as well as the newer "Adding requests" progress bar in the LLM._add_requests_with_fixed_progress_bars method.

I propose adding a new Boolean argument, tqdm_leave_pbar, defaulting to True, consistent with the current behaviour, to all functions with the use_tqdm argument.

Alternatives

I'm currently dealing with this myself in a hacky way by replacing the above-mentioned methods of LLM with copied ones where I have set leave=False manually. This is of course not sustainable, as I don't get any updates to these methods.

Additional context

No response

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[22quinn]

tqdm allows environment variable overrides. Simple use TQDM_LEAVE=0 to clear the bar or TQDM_DISABLE=1 to turn it off completely

[saattrupdan]

tqdm allows environment variable overrides. Simple use TQDM_LEAVE=0 to clear the bar or TQDM_DISABLE=1 to turn it off completely

I'm afraid I need it for only some progress bars, so the env vars do not really cut it I'm afraid. I only want leave=True set for vLLM progress bars.