Source code for autosklearn.pipeline.components.classification

__author__ = 'feurerm'

from collections import OrderedDict
import copy
import os

from ..base import AutoSklearnClassificationAlgorithm, find_components, \
    ThirdPartyComponents, AutoSklearnChoice
from ConfigSpace.configuration_space import ConfigurationSpace
from ConfigSpace.hyperparameters import CategoricalHyperparameter
from ConfigSpace.conditions import EqualsCondition

classifier_directory = os.path.split(__file__)[0]
_classifiers = find_components(__package__,
_addons = ThirdPartyComponents(AutoSklearnClassificationAlgorithm)

[docs]def add_classifier(classifier): _addons.add_component(classifier)
class ClassifierChoice(AutoSklearnChoice): def get_components(cls): components = OrderedDict() components.update(_classifiers) components.update(_addons.components) return components def get_available_components(cls, dataset_properties=None, include=None, exclude=None): if dataset_properties is None: dataset_properties = {} available_comp = cls.get_components() components_dict = OrderedDict() if include is not None and exclude is not None: raise ValueError("The argument include and exclude cannot be used together.") if include is not None: for incl in include: if incl not in available_comp: raise ValueError("Trying to include unknown component: " "%s" % incl) for name in available_comp: if include is not None and name not in include: continue elif exclude is not None and name in exclude: continue entry = available_comp[name] # Avoid infinite loop if entry == ClassifierChoice: continue if entry.get_properties()['handles_classification'] is False: continue if dataset_properties.get('multiclass') is True and entry.get_properties()[ 'handles_multiclass'] is False: continue if dataset_properties.get('multilabel') is True and available_comp[name]. \ get_properties()['handles_multilabel'] is False: continue components_dict[name] = entry return components_dict def get_hyperparameter_search_space(self, dataset_properties=None, default=None, include=None, exclude=None): if dataset_properties is None: dataset_properties = {} if include is not None and exclude is not None: raise ValueError("The arguments include_estimators and " "exclude_estimators cannot be used together.") cs = ConfigurationSpace() # Compile a list of all estimator objects for this problem available_estimators = self.get_available_components( dataset_properties=dataset_properties, include=include, exclude=exclude) if len(available_estimators) == 0: raise ValueError("No classifiers found") if default is None: defaults = ['random_forest', 'liblinear_svc', 'sgd', 'libsvm_svc'] + list(available_estimators.keys()) for default_ in defaults: if default_ in available_estimators: if include is not None and default_ not in include: continue if exclude is not None and default_ in exclude: continue default = default_ break estimator = CategoricalHyperparameter('__choice__', list(available_estimators.keys()), default_value=default) cs.add_hyperparameter(estimator) for estimator_name in available_estimators.keys(): estimator_configuration_space = available_estimators[estimator_name].\ get_hyperparameter_search_space(dataset_properties) parent_hyperparameter = {'parent': estimator, 'value': estimator_name} cs.add_configuration_space(estimator_name, estimator_configuration_space, parent_hyperparameter=parent_hyperparameter) self.configuration_space_ = cs self.dataset_properties_ = dataset_properties return cs def predict_proba(self, X): return self.choice.predict_proba(X) def estimator_supports_iterative_fit(self): return hasattr(self.choice, 'iterative_fit') def iterative_fit(self, X, y, n_iter=1, **fit_params): if fit_params is None: fit_params = {} return self.choice.iterative_fit(X, y, n_iter=n_iter, **fit_params) def configuration_fully_fitted(self): return self.choice.configuration_fully_fitted()