scalismo.sampling.evaluators.PairEvaluator.scala Maven / Gradle / Ivy
/*
* Copyright 2016 University of Basel, Graphics and Vision Research Group
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package scalismo.sampling.evaluators
import scalismo.sampling.DistributionEvaluator
/** probability density based on pairs, e.g. Gaussian centered on first evaluated at second */
trait PairEvaluator[A] {
self =>
/** probability/density value for a pair (log value) */
def logValue(first: A, second: A): Double
/** make a distribution evaluator, centered at first */
def toDistributionEvaluator(first: A): DistributionEvaluator[A] = new DistributionEvaluator[A] {
override def logValue(sample: A): Double = self.logValue(first, sample)
override def toString = self.toString
}
/** make a distribution evaluator for tuples to encode pairs */
def tupled = new DistributionEvaluator[(A, A)] {
override def logValue(sample: (A, A)): Double = self.logValue(sample._1, sample._2)
override def toString = self.toString
}
}