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# Author: Simon Blanke |
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# Email: [email protected] |
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# License: MIT License |
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import numpy as np |
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from scipy.stats import norm |
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from .smbo import SMBO |
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from .surrogate_models import ( |
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RandomForestRegressor, |
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ExtraTreesRegressor, |
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GradientBoostingRegressor, |
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) |
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from .acquisition_function import ExpectedImprovement |
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tree_regressor_dict = { |
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"random_forest": RandomForestRegressor, |
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"extra_tree": ExtraTreesRegressor, |
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"gradient_boost": GradientBoostingRegressor, |
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} |
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def normalize(array): |
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num = array - array.min() |
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den = array.max() - array.min() |
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if den == 0: |
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return np.random.random_sample(array.shape) |
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else: |
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return ((num / den) + 0) / 1 |
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View Code Duplication |
class ForestOptimizer(SMBO): |
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name = "Forest Optimization" |
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_name_ = "forest_optimization" |
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"""Based on the forest-optimizer in the scikit-optimize package""" |
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def __init__( |
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self, |
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*args, |
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tree_regressor="extra_tree", |
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tree_para={"n_estimators": 100}, |
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xi=0.03, |
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warm_start_smbo=None, |
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max_sample_size=10000000, |
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sampling={"random": 1000000}, |
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warnings=100000000, |
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**kwargs |
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): |
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super().__init__(*args, **kwargs) |
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self.tree_regressor = tree_regressor |
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self.tree_para = tree_para |
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self.regr = tree_regressor_dict[tree_regressor](**self.tree_para) |
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self.xi = xi |
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self.warm_start_smbo = warm_start_smbo |
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self.max_sample_size = max_sample_size |
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self.sampling = sampling |
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self.warnings = warnings |
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self.init_warm_start_smbo() |
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def _expected_improvement(self): |
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all_pos_comb = self._all_possible_pos() |
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self.pos_comb = self._sampling(all_pos_comb) |
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acqu_func = ExpectedImprovement(self.regr, self.pos_comb, self.xi) |
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return acqu_func.calculate(self.X_sample, self.Y_sample) |
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def _training(self): |
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X_sample = np.array(self.X_sample) |
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Y_sample = np.array(self.Y_sample) |
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if len(Y_sample) == 0: |
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return self.move_random() |
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Y_sample = normalize(Y_sample).reshape(-1, 1) |
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self.regr.fit(X_sample, Y_sample) |
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SimonBlanke /
Gradient-Free-Optimizers
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