float getSegmentationScore() {
        if (segments == 0) return 0;
        return getAbsoluteProximity() * getExactness() / (segments * segments);
    }
<p>The metric use to select the best segments during execution of the string match metric algorithm.</p>

<p>This metric, and any metric it depends on, must be correct each time a segment is completed,
not only when the metrics are complete, because this metric is used to choose segments during calculation.</p>
searchlib/src/main/java/com/yahoo/searchlib/ranking/features/fieldmatch/FieldMatchMetrics.java