imblearn.metrics
.sensitivity_score¶

imblearn.metrics.
sensitivity_score
(y_true, y_pred, labels=None, pos_label=1, average='binary', sample_weight=None)[source]¶ Compute the sensitivity
The sensitivity is the ratio
tp / (tp + fn)
wheretp
is the number of true positives andfn
the number of false negatives. The sensitivity quantifies the ability to avoid false negatives.The best value is 1 and the worst value is 0.
Read more in the User Guide.
Parameters:  y_true : ndarray, shape (n_samples, )
Ground truth (correct) target values.
 y_pred : ndarray, shape (n_samples, )
Estimated targets as returned by a classifier.
 labels : list, optional
The set of labels to include when
average != 'binary'
, and their order ifaverage is None
. Labels present in the data can be excluded, for example to calculate a multiclass average ignoring a majority negative class, while labels not present in the data will result in 0 components in a macro average. pos_label : str or int, optional (default=1)
The class to report if
average='binary'
and the data is binary. If the data are multiclass, this will be ignored; settinglabels=[pos_label]
andaverage != 'binary'
will report scores for that label only. average : str or None, optional (default=None)
If
None
, the scores for each class are returned. Otherwise, this determines the type of averaging performed on the data:'binary'
:Only report results for the class specified by
pos_label
. This is applicable only if targets (y_{true,pred}
) are binary.'micro'
:Calculate metrics globally by counting the total true positives, false negatives and false positives.
'macro'
:Calculate metrics for each label, and find their unweighted mean. This does not take label imbalance into account.
'weighted'
:Calculate metrics for each label, and find their average, weighted by support (the number of true instances for each label). This alters ‘macro’ to account for label imbalance; it can result in an Fscore that is not between precision and recall.
'samples'
:Calculate metrics for each instance, and find their average (only meaningful for multilabel classification where this differs from
accuracy_score
).
 warn_for : tuple or set, for internal use
This determines which warnings will be made in the case that this function is being used to return only one of its metrics.
 sample_weight : ndarray, shape (n_samples, )
Sample weights.
Returns:  specificity : float (if
average
= None) or ndarray, shape (n_unique_labels, )
Examples
>>> import numpy as np >>> from imblearn.metrics import sensitivity_score >>> y_true = [0, 1, 2, 0, 1, 2] >>> y_pred = [0, 2, 1, 0, 0, 1] >>> sensitivity_score(y_true, y_pred, average='macro') 0.33333333333333331 >>> sensitivity_score(y_true, y_pred, average='micro') 0.33333333333333331 >>> sensitivity_score(y_true, y_pred, average='weighted') 0.33333333333333331 >>> sensitivity_score(y_true, y_pred, average=None) array([ 1., 0., 0.])