ray.tune.search.dragonfly.DragonflySearch#

class ray.tune.search.dragonfly.DragonflySearch(optimizer: Optional[str] = None, domain: Optional[str] = None, space: Optional[Union[Dict, List[Dict]]] = None, metric: Optional[str] = None, mode: Optional[str] = None, points_to_evaluate: Optional[List[Dict]] = None, evaluated_rewards: Optional[List] = None, random_state_seed: Optional[int] = None, **kwargs)[source]#

Bases: ray.tune.search.searcher.Searcher

Uses Dragonfly to optimize hyperparameters.

Dragonfly provides an array of tools to scale up Bayesian optimisation to expensive large scale problems, including high dimensional optimisation. parallel evaluations in synchronous or asynchronous settings, multi-fidelity optimisation (using cheap approximations to speed up the optimisation process), and multi-objective optimisation. For more info:

Dragonfly Website: https://github.com/dragonfly/dragonfly
Dragonfly Documentation: https://dragonfly-opt.readthedocs.io/

To use this search algorithm, install Dragonfly:

$ pip install dragonfly-opt

This interface requires using FunctionCallers and optimizers provided by Dragonfly.

This searcher will automatically filter out any NaN, inf or -inf results.

Parameters

optimizer – Optimizer provided from dragonfly. Choose an optimiser that extends BlackboxOptimiser. If this is a string, domain must be set and optimizer must be one of [random, bandit, genetic].
domain – Optional domain. Should only be set if you don’t pass an optimizer as the optimizer argument. Has to be one of [cartesian, euclidean].
space – Search space. Should only be set if you don’t pass an optimizer as the optimizer argument. Defines the search space and requires a domain to be set. Can be automatically converted from the param_space dict passed to tune.Tuner().
metric – The training result objective value attribute. If None but a mode was passed, the anonymous metric _metric will be used per default.
mode – One of {min, max}. Determines whether objective is minimizing or maximizing the metric attribute.
points_to_evaluate – Initial parameter suggestions to be run first. This is for when you already have some good parameters you want to run first to help the algorithm make better suggestions for future parameters. Needs to be a list of dicts containing the configurations.
evaluated_rewards – If you have previously evaluated the parameters passed in as points_to_evaluate you can avoid re-running those trials by passing in the reward attributes as a list so the optimiser can be told the results without needing to re-compute the trial. Must be the same length as points_to_evaluate.
random_state_seed – Seed for reproducible results. Defaults to None. Please note that setting this to a value will change global random state for numpy on initalization and loading from checkpoint.

Tune automatically converts search spaces to Dragonfly’s format:

from ray import tune

config = {
    "LiNO3_vol": tune.uniform(0, 7),
    "Li2SO4_vol": tune.uniform(0, 7),
    "NaClO4_vol": tune.uniform(0, 7)
}

df_search = DragonflySearch(
    optimizer="bandit",
    domain="euclidean",
    metric="objective",
    mode="max")

tuner = tune.Tuner(
    my_func,
    tune_config=tune.TuneConfig(
        search_alg=df_search
    ),
    param_space=config
)
tuner.fit()

If you would like to pass the search space/optimizer manually, the code would look like this:

from ray import tune

space = [{
    "name": "LiNO3_vol",
    "type": "float",
    "min": 0,
    "max": 7
}, {
    "name": "Li2SO4_vol",
    "type": "float",
    "min": 0,
    "max": 7
}, {
    "name": "NaClO4_vol",
    "type": "float",
    "min": 0,
    "max": 7
}]

df_search = DragonflySearch(
    optimizer="bandit",
    domain="euclidean",
    space=space,
    metric="objective",
    mode="max")

tuner = tune.Tuner(
    my_func,
    tune_config=tune.TuneConfig(
        search_alg=df_search
    ),
)
tuner.fit()

add_evaluated_point(parameters: Dict, value: float, error: bool = False, pruned: bool = False, intermediate_values: Optional[List[float]] = None)[source]#

Pass results from a point that has been evaluated separately.

This method allows for information from outside the suggest - on_trial_complete loop to be passed to the search algorithm. This functionality depends on the underlying search algorithm and may not be always available.

Parameters

parameters – Parameters used for the trial.
value – Metric value obtained in the trial.
error – True if the training process raised an error.
pruned – True if trial was pruned.
intermediate_values – List of metric values for intermediate iterations of the result. None if not applicable.

set_search_properties(metric: Optional[str], mode: Optional[str], config: Dict, **spec) → bool[source]#

Pass search properties to searcher.

This method acts as an alternative to instantiating search algorithms with their own specific search spaces. Instead they can accept a Tune config through this method. A searcher should return True if setting the config was successful, or False if it was unsuccessful, e.g. when the search space has already been set.

Parameters

metric – Metric to optimize
mode – One of [“min”, “max”]. Direction to optimize.
config – Tune config dict.
**spec – Any kwargs for forward compatiblity. Info like Experiment.PUBLIC_KEYS is provided through here.

suggest(trial_id: str) → Optional[Dict][source]#

Queries the algorithm to retrieve the next set of parameters.

Parameters

trial_id – Trial ID used for subsequent notifications.

Returns

Configuration for a trial, if possible.: If FINISHED is returned, Tune will be notified that no more suggestions/configurations will be provided. If None is returned, Tune will skip the querying of the searcher for this step.

Return type

dict | FINISHED | None

on_trial_complete(trial_id: str, result: Optional[Dict] = None, error: bool = False)[source]#: Passes result to Dragonfly unless early terminated or errored.

save(checkpoint_path: str)[source]#

Save state to path for this search algorithm.

Parameters: checkpoint_path – File where the search algorithm state is saved. This path should be used later when restoring from file.

Example:

search_alg = Searcher(...)

tuner = tune.Tuner(
    cost,
    tune_config=tune.TuneConfig(
        search_alg=search_alg,
        num_samples=5
    ),
    param_space=config
)
results = tuner.fit()

search_alg.save("./my_favorite_path.pkl")

Changed in version 0.8.7: Save is automatically called by Tuner().fit(). You can use Tuner().restore() to restore from an experiment directory such as /ray_results/trainable.

restore(checkpoint_path: str)[source]#

Restore state for this search algorithm

Parameters: checkpoint_path – File where the search algorithm state is saved. This path should be the same as the one provided to “save”.

Example:

search_alg.save("./my_favorite_path.pkl")

search_alg2 = Searcher(...)
search_alg2 = ConcurrencyLimiter(search_alg2, 1)
search_alg2.restore(checkpoint_path)
tuner = tune.Tuner(
    cost,
    tune_config=tune.TuneConfig(
        search_alg=search_alg2,
        num_samples=5
    ),
)
tuner.fit()

Ray 2.3.0

ray.tune.search.dragonfly.DragonflySearch

ray.tune.search.dragonfly.DragonflySearch#