binary_classification_objective =========================================================== .. py:module:: evalml.objectives.binary_classification_objective .. autoapi-nested-parse:: Base class for all binary classification objectives. Module Contents --------------- Classes Summary ~~~~~~~~~~~~~~~ .. autoapisummary:: evalml.objectives.binary_classification_objective.BinaryClassificationObjective Contents ~~~~~~~~~~~~~~~~~~~ .. py:class:: BinaryClassificationObjective Base class for all binary classification objectives. **Attributes** .. list-table:: :widths: 15 85 :header-rows: 0 * - **problem_types** - [ProblemTypes.BINARY, ProblemTypes.TIME_SERIES_BINARY] **Methods** .. autoapisummary:: :nosignatures: evalml.objectives.binary_classification_objective.BinaryClassificationObjective.calculate_percent_difference evalml.objectives.binary_classification_objective.BinaryClassificationObjective.can_optimize_threshold evalml.objectives.binary_classification_objective.BinaryClassificationObjective.decision_function evalml.objectives.binary_classification_objective.BinaryClassificationObjective.expected_range evalml.objectives.binary_classification_objective.BinaryClassificationObjective.greater_is_better evalml.objectives.binary_classification_objective.BinaryClassificationObjective.is_bounded_like_percentage evalml.objectives.binary_classification_objective.BinaryClassificationObjective.is_defined_for_problem_type evalml.objectives.binary_classification_objective.BinaryClassificationObjective.name evalml.objectives.binary_classification_objective.BinaryClassificationObjective.objective_function evalml.objectives.binary_classification_objective.BinaryClassificationObjective.optimize_threshold evalml.objectives.binary_classification_objective.BinaryClassificationObjective.perfect_score evalml.objectives.binary_classification_objective.BinaryClassificationObjective.positive_only evalml.objectives.binary_classification_objective.BinaryClassificationObjective.score evalml.objectives.binary_classification_objective.BinaryClassificationObjective.score_needs_proba evalml.objectives.binary_classification_objective.BinaryClassificationObjective.validate_inputs .. py:method:: calculate_percent_difference(cls, score, baseline_score) :classmethod: Calculate the percent difference between scores. :param score: A score. Output of the score method of this objective. :type score: float :param baseline_score: A score. Output of the score method of this objective. In practice, this is the score achieved on this objective with a baseline estimator. :type baseline_score: float :returns: The percent difference between the scores. Note that for objectives that can be interpreted as percentages, this will be the difference between the reference score and score. For all other objectives, the difference will be normalized by the reference score. :rtype: float .. py:method:: can_optimize_threshold(cls) :property: Returns a boolean determining if we can optimize the binary classification objective threshold. This will be false for any objective that works directly with predicted probabilities, like log loss and AUC. Otherwise, it will be true. :returns: Whether or not an objective can be optimized. :rtype: bool .. py:method:: decision_function(self, ypred_proba, threshold=0.5, X=None) Apply a learned threshold to predicted probabilities to get predicted classes. :param ypred_proba: The classifier's predicted probabilities :type ypred_proba: pd.Series, np.ndarray :param threshold: Threshold used to make a prediction. Defaults to 0.5. :type threshold: float, optional :param X: Any extra columns that are needed from training data. :type X: pd.DataFrame, optional :returns: predictions .. py:method:: expected_range(cls) :property: Returns the expected range of the objective, which is not necessarily the possible ranges. For example, our expected R2 range is from [-1, 1], although the actual range is (-inf, 1]. .. py:method:: greater_is_better(cls) :property: Returns a boolean determining if a greater score indicates better model performance. .. py:method:: is_bounded_like_percentage(cls) :property: Returns whether this objective is bounded between 0 and 1, inclusive. .. py:method:: is_defined_for_problem_type(cls, problem_type) :classmethod: Returns whether or not an objective is defined for a problem type. .. py:method:: name(cls) :property: Returns a name describing the objective. .. py:method:: objective_function(cls, y_true, y_predicted, X=None, sample_weight=None) :classmethod: :abstractmethod: Computes the relative value of the provided predictions compared to the actual labels, according a specified metric. Args: y_predicted (pd.Series): Predicted values of length [n_samples] y_true (pd.Series): Actual class labels of length [n_samples] X (pd.DataFrame or np.ndarray): Extra data of shape [n_samples, n_features] necessary to calculate score sample_weight (pd.DataFrame or np.ndarray): Sample weights used in computing objective value result :returns: Numerical value used to calculate score .. py:method:: optimize_threshold(self, ypred_proba, y_true, X=None) Learn a binary classification threshold which optimizes the current objective. :param ypred_proba: The classifier's predicted probabilities :type ypred_proba: pd.Series :param y_true: The ground truth for the predictions. :type y_true: pd.Series :param X: Any extra columns that are needed from training data. :type X: pd.DataFrame, optional :returns: Optimal threshold for this objective. :raises RuntimeError: If objective cannot be optimized. .. py:method:: perfect_score(cls) :property: Returns the score obtained by evaluating this objective on a perfect model. .. py:method:: positive_only(cls) If True, this objective is only valid for positive data. Defaults to False. .. py:method:: score(self, y_true, y_predicted, X=None, sample_weight=None) Returns a numerical score indicating performance based on the differences between the predicted and actual values. :param y_predicted: Predicted values of length [n_samples] :type y_predicted: pd.Series :param y_true: Actual class labels of length [n_samples] :type y_true: pd.Series :param X: Extra data of shape [n_samples, n_features] necessary to calculate score :type X: pd.DataFrame or np.ndarray :param sample_weight: Sample weights used in computing objective value result :type sample_weight: pd.DataFrame or np.ndarray :returns: score .. py:method:: score_needs_proba(cls) :property: Returns a boolean determining if the score() method needs probability estimates. This should be true for objectives which work with predicted probabilities, like log loss or AUC, and false for objectives which compare predicted class labels to the actual labels, like F1 or correlation. .. py:method:: validate_inputs(self, y_true, y_predicted) Validate inputs for scoring.