[Bug] cut/paste typo in python/ray/tune/schedulers/__init__.py on line 58

[amholler]

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Ray Component

Ray Tune

What happened + What you expected to happen

When calling RayTune from Ludwig, I had incorrectly specified scheduler type as skopt and search_alg type
as fifo, so the error message from RayTune was really confusing (see below).

{   'executor': {   'cpu_resources_per_trial': 1,
                    'gpu_resources_per_trial': 1,
                    'type': 'ray'},
    'goal': 'minimize',
    'metric': 'loss',
    'output_feature': 'combined',
    'parameters': {   'training.batch_size': {   'categories': [512, 1024],
                                                 'space': 'choice'}},
    'sampler': {   'num_samples': 2,
                   'scheduler': {'max_t': 1, 'type': 'skopt'},
                   'search_alg': {'type': 'fifo'},
                   'type': 'ray'},
    'split': 'validation'}
ValueError: Search alg must be one of ['fifo', 'async_hyperband', 'asynchyperband', 'median_stopping_rule', 'medianstopping', 'hyperband', 'hb_bohb', 'pbt', 'pbt_replay', 'pb2', 'resource_changing']. Got: skopt

So eventually I figured out the error message from RayTune was incorrect & I needed to swap the type values for scheduler and search_alg. Filing this issue so others won't be confused.

Versions / Dependencies

Observed with current top of master commit 19e3280

Reproduction script

Swap the type parameters to RayTune as shown.

Anything else

Always happens on incorrect input

Are you willing to submit a PR?

• Yes I am willing to submit a PR!