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MultiFBeta

Multi-class F-Beta score with different betas per class.

The multiclass F-Beta score is the arithmetic average of the binary F-Beta scores of each class. The mean can be weighted by providing class weights.

Parameters

  • betas

    Weight of precision in the harmonic mean of each class.

  • weights

    Class weights. If not provided then uniform weights will be used.

  • cm

    Default → None

    This parameter allows sharing the same confusion matrix between multiple metrics. Sharing a confusion matrix reduces the amount of storage and computation time.

Attributes

  • bigger_is_better

    Indicate if a high value is better than a low one or not.

  • requires_labels

    Indicates if labels are required, rather than probabilities.

  • works_with_weights

    Indicate whether the model takes into consideration the effect of sample weights

Examples

from river import metrics

y_true = [0, 1, 2, 2, 2]
y_pred = [0, 0, 2, 2, 1]

metric = metrics.MultiFBeta(
    betas={0: 0.25, 1: 1, 2: 4},
    weights={0: 1, 1: 1, 2: 2}
)

for yt, yp in zip(y_true, y_pred):
    metric.update(yt, yp)
    print(metric)

MultiFBeta: 100.00%
MultiFBeta: 25.76%
MultiFBeta: 62.88%
MultiFBeta: 62.88%
MultiFBeta: 46.88%

Methods

get

Return the current value of the metric.

is_better_than

Indicate if the current metric is better than another one.

Parameters

  • other

revert

Revert the metric.

Parameters

  • y_true
  • y_pred
  • w — defaults to 1.0

update

Update the metric.

Parameters

  • y_true
  • y_pred
  • w — defaults to 1.0

works_with

Indicates whether or not a metric can work with a given model.

Parameters