sklearn.metrics
.label_ranking_average_precision_score¶

sklearn.metrics.
label_ranking_average_precision_score
(y_true, y_score, *, sample_weight=None)[source]¶ Compute rankingbased average precision.
Label ranking average precision (LRAP) is the average over each ground truth label assigned to each sample, of the ratio of true vs. total labels with lower score.
This metric is used in multilabel ranking problem, where the goal is to give better rank to the labels associated to each sample.
The obtained score is always strictly greater than 0 and the best value is 1.
Read more in the User Guide.
 Parameters
 y_true{ndarray, sparse matrix} of shape (n_samples, n_labels)
True binary labels in binary indicator format.
 y_scorendarray of shape (n_samples, n_labels)
Target scores, can either be probability estimates of the positive class, confidence values, or nonthresholded measure of decisions (as returned by “decision_function” on some classifiers).
 sample_weightarraylike of shape (n_samples,), default=None
Sample weights.
New in version 0.20.
 Returns
 scorefloat
Examples
>>> import numpy as np >>> from sklearn.metrics import label_ranking_average_precision_score >>> y_true = np.array([[1, 0, 0], [0, 0, 1]]) >>> y_score = np.array([[0.75, 0.5, 1], [1, 0.2, 0.1]]) >>> label_ranking_average_precision_score(y_true, y_score) 0.416...