# -*- coding: ascii -*-
"""Single-run false positive count metric."""
__author__ = "Danil Totmyanin"
__copyright__ = "Copyright (c) 2026 PySATL project"
__license__ = "SPDX-License-Identifier: MIT"
from pysatl_cpd.analysis.metrics.single_run.classification.base import ClassificationPrimitive
from pysatl_cpd.core.detection_trace import DetectionTrace
from pysatl_cpd.core.single_run import SingleRun
from pysatl_cpd.data.providers.labeled.labeled_data import LabeledData as LabeledData
[docs]
class FalsePositiveCount[TraceT: DetectionTrace, ProviderT: LabeledData](ClassificationPrimitive[TraceT, ProviderT]):
"""Count detections that are not matched to any true change point."""
[docs]
def evaluate(self, run: SingleRun[TraceT, ProviderT]) -> int:
"""Count detections that are not matched to any true change point.
Parameters
----------
run
A single detection run with trace and labeled provider.
Returns
-------
int
The false positive count.
"""
matching = self.match(run.trace.detected_change_points, run.provider.change_points)
return len(run.trace.detected_change_points) - sum(len(matches) for matches in matching.values())