tf.metrics.sensitivity_at_specificity

View source on GitHub

Computes the specificity at a given sensitivity.

tf.metrics.sensitivity_at_specificity(
    labels, predictions, specificity, weights=None, num_thresholds=200,
    metrics_collections=None, updates_collections=None, name=None
)

The sensitivity_at_specificity function creates four local variables, true_positives, true_negatives, false_positives and false_negatives that are used to compute the sensitivity at the given specificity value. The threshold for the given specificity value is computed and used to evaluate the corresponding sensitivity.

For estimation of the metric over a stream of data, the function creates an update_op operation that updates these variables and returns the sensitivity. update_op increments the true_positives, true_negatives, false_positives and false_negatives counts with the weight of each case found in the predictions and labels.

If weights is None, weights default to 1. Use weights of 0 to mask values.

For additional information about specificity and sensitivity, see the following: https://en.wikipedia.org/wiki/Sensitivity_and_specificity

labels The ground truth values, a Tensor whose dimensions must match predictions. Will be cast to bool.
predictions A floating point Tensor of arbitrary shape and whose values are in the range [0, 1].
specificity A scalar value in range [0, 1].
weights Optional Tensor whose rank is either 0, or the same rank as labels, and must be broadcastable to labels (i.e., all dimensions must be either 1, or the same as the corresponding labels dimension).
num_thresholds The number of thresholds to use for matching the given specificity.
metrics_collections An optional list of collections that sensitivity should be added to.
updates_collections An optional list of collections that update_op should be added to.
name An optional variable_scope name.

sensitivity A scalar Tensor representing the sensitivity at the given specificity value.
update_op An operation that increments the true_positives, true_negatives, false_positives and false_negatives variables appropriately and whose value matches sensitivity.

ValueError If predictions and labels have mismatched shapes, if weights is not None and its shape doesn't match predictions, or if specificity is not between 0 and 1, or if either metrics_collections or updates_collections are not a list or tuple.
RuntimeError If eager execution is enabled.