sklearn.metrics.det_curve(y_true, y_score, pos_label=None, sample_weight=None)[source]

Compute error rates for different probability thresholds.


This metric is used for evaluation of ranking and error tradeoffs of a binary classification task.

Read more in the User Guide.

New in version 0.24.

y_truendarray of shape (n_samples,)

True binary labels. If labels are not either {-1, 1} or {0, 1}, then pos_label should be explicitly given.

y_scorendarray of shape of (n_samples,)

Target scores, can either be probability estimates of the positive class, confidence values, or non-thresholded measure of decisions (as returned by “decision_function” on some classifiers).

pos_labelint, float, bool or str, default=None

The label of the positive class. When pos_label=None, if y_true is in {-1, 1} or {0, 1}, pos_label is set to 1, otherwise an error will be raised.

sample_weightarray-like of shape (n_samples,), default=None

Sample weights.

fprndarray of shape (n_thresholds,)

False positive rate (FPR) such that element i is the false positive rate of predictions with score >= thresholds[i]. This is occasionally referred to as false acceptance propability or fall-out.

fnrndarray of shape (n_thresholds,)

False negative rate (FNR) such that element i is the false negative rate of predictions with score >= thresholds[i]. This is occasionally referred to as false rejection or miss rate.

thresholdsndarray of shape (n_thresholds,)

Decreasing score values.

See also


Plot DET curve given an estimator and some data.


Plot DET curve given the true and predicted labels.


DET curve visualization.


Compute Receiver operating characteristic (ROC) curve.


Compute precision-recall curve.


>>> import numpy as np
>>> from sklearn.metrics import det_curve
>>> y_true = np.array([0, 0, 1, 1])
>>> y_scores = np.array([0.1, 0.4, 0.35, 0.8])
>>> fpr, fnr, thresholds = det_curve(y_true, y_scores)
>>> fpr
array([0.5, 0.5, 0. ])
>>> fnr
array([0. , 0.5, 0.5])
>>> thresholds
array([0.35, 0.4 , 0.8 ])

Examples using sklearn.metrics.det_curve

Detection error tradeoff (DET) curve

Detection error tradeoff (DET) curve