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<p>Get the parameter names for the search space.</p>
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<p><strong>Returns:</strong>
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- <code>list[str] | None</code>: Parameter names. If <code>None</code>, any parameter keys are accepted.</p>
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<p>Notes:
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- When <code>paramnames()</code> returns a list, <code>params</code> passed to <code>evaluate/score</code> must be a subset of that list; otherwise a <code>ValueError</code> is raised.
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- <code>list[str] | None</code>: Parameter names. If <code>None</code>, any parameter keys are accepted.
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- <code>__call__(params)</code> is provided as shorthand for <code>score(params)</code> and returns only the score (float).
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- Score sign follows the tag <code>property:higher_or_lower_is_better</code>:
<li>Parallelism via optimizer backends (<code>backend</code>, <code>backend_params</code>)</li>
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<li>Results exposed on the optimizer (<code>best_params_</code>, <code>best_score_</code>, etc.)</li>
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</ul>
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<p>Note: These are not thin wrappers over <code>GridSearchCV</code> / <code>RandomizedSearchCV</code>. Cross‑validation is handled by the experiment (<code>SklearnCvExperiment</code>), and parallelization is controlled by Hyperactive’s backends.</p>
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