[Tune] How to turn off checkpointing for testing

[max_ronda]

Thank you @kai and @Lars_Simon_Zehnder for clarifying terms and the insightful messages! I tested all the suggested settings and these are the results I got:

Running same experiment:

ray.init(num_cpus=5)
num_samples=1000
trainable_func=problem_rosenbrock()

Test 1 (fastest)

Setting session.report({"mean_loss": z, "done": True}) within trainable

os.environ["TUNE_DISABLE_AUTO_CALLBACK_LOGGERS"] = "1"
reuse_actors=True
log_to_file=False

Time : 22 secs

Test 2

Re-using actors and setting env var

os.environ["TUNE_DISABLE_AUTO_CALLBACK_LOGGERS"] = "1"
reuse_actors=True
log_to_file=False

Time : 28 seconds

Test 3

Logging to file stdout and stderr

os.environ["TUNE_DISABLE_AUTO_CALLBACK_LOGGERS"] = "1"
reuse_actors=True
log_to_file=True

Time : 32 seconds

Test 4

Not setting env var but re-using actors

reuse_actors=True
log_to_file=False

Time : 42 secs

Test 5 (slowest)

Not re-using actors but setting env var

os.environ["TUNE_DISABLE_AUTO_CALLBACK_LOGGERS"] = "1"
reuse_actors=False
log_to_file=False

Time : ~10 mins

I realize I would not get the same speed as running native Optuna but happy to see there are settings I can tweak to improve performance.

Questions

1. @kai , is there a way to disable logging all completely ? Similar to what this user asked.
2. Is there a way to customize the trial name and dirname? I see there is a trial_dirname_creator parameter that seems to work within tune.run() call but have not seen an example within tune.Tuner api . Are there some examples on how to pass trial_name_creator and trial_dirname_creator for current Tuner api?

Again, thanks for all the responses ! This has been very helpful