compare-llama-bench.py: add missing basicConfig

[mofosyne]

Source Issue: #6511

@csaben

This has broken compare-llama-bench.py.

I believe it's due to missing this line logging.basicConfig(level=logging.DEBUG if known_args.verbose else logging.INFO). See if this fixes the issue for you.

[JohannesGaessler]

The logging still messes up the table formatting:

INFO:compare-llama-bench:| GPU      | Model         | Test   |   t/s 60325fa5 |   t/s b49f134f |   Speedup |
|:---------|:--------------|:-------|---------------:|---------------:|----------:|
| RTX 3090 | llama 7B Q4_0 | pp4096 |         125.14 |         119.56 |      0.96 |

Also please re-add the line-breaks between error messages and print_help().

[JohannesGaessler]

More generally, unless I'm missing something the --verbose flag doesn't actually do anything. So my suggestion would be to just use regular prints for the table which would then also fix the need for the flag in the first place.

[mofosyne]

Okay added both suggestions. Regarding the --verbose flag, it shall be kept to give future developers an option of using log_debug() without worrying about the output getting too polluted with debug messages.