# ignite.contrib.metrics#

## Contrib module metrics#

 AveragePrecision Computes Average Precision accumulating predictions and the ground-truth during an epoch and applying sklearn.metrics.average_precision_score . CohenKappa Compute different types of Cohen's Kappa: Non-Wieghted, Linear, Quadratic. GpuInfo Provides GPU information: a) used memory percentage, b) gpu utilization percentage values as Metric on each iterations. PrecisionRecallCurve Compute precision-recall pairs for different probability thresholds for binary classification task by accumulating predictions and the ground-truth during an epoch and applying sklearn.metrics.precision_recall_curve . ROC_AUC Computes Area Under the Receiver Operating Characteristic Curve (ROC AUC) accumulating predictions and the ground-truth during an epoch and applying sklearn.metrics.roc_auc_score . RocCurve Compute Receiver operating characteristic (ROC) for binary classification task by accumulating predictions and the ground-truth during an epoch and applying sklearn.metrics.roc_curve .

## Regression metrics#

Module ignite.contrib.metrics.regression provides implementations of metrics useful for regression tasks. Definitions of metrics are based on Botchkarev 2018, page 30 “Appendix 2. Metrics mathematical definitions”.

Complete list of metrics:

 CanberraMetric Calculates the Canberra Metric. FractionalAbsoluteError Calculates the Fractional Absolute Error. FractionalBias Calculates the Fractional Bias. GeometricMeanAbsoluteError Calculates the Geometric Mean Absolute Error. GeometricMeanRelativeAbsoluteError Calculates the Geometric Mean Relative Absolute Error. ManhattanDistance Calculates the Manhattan Distance. MaximumAbsoluteError Calculates the Maximum Absolute Error. MeanAbsoluteRelativeError Calculate Mean Absolute Relative Error. MeanError Calculates the Mean Error. MeanNormalizedBias Calculates the Mean Normalized Bias. MedianAbsoluteError Calculates the Median Absolute Error. MedianAbsolutePercentageError Calculates the Median Absolute Percentage Error. MedianRelativeAbsoluteError Calculates the Median Relative Absolute Error. R2Score Calculates the R-Squared, the coefficient of determination. WaveHedgesDistance Calculates the Wave Hedges Distance.