[GitHub] flink pull request #1849: [FLINK-2157] [ml] Create evaluation framework for ...

[skonto <gi...@git.apache.org>]

Github user skonto commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1849#discussion_r96403197
  
    --- Diff: flink-libraries/flink-ml/src/main/scala/org/apache/flink/ml/evaluation/Score.scala ---
    @@ -0,0 +1,145 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you 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 org.apache.flink.ml.evaluation
    +
    +import org.apache.flink.api.common.typeinfo.TypeInformation
    +import org.apache.flink.api.scala._
    +import org.apache.flink.ml._
    +
    +import scala.reflect.ClassTag
    +
    +/**
    + * Evaluation score
    + *
    + * Can be used to calculate a performance score for an algorithm, when provided with a DataSet
    + * of (truth, prediction) tuples
    + *
    + * @tparam PredictionType output type
    + */
    +trait Score[PredictionType] {
    --- End diff --
    
    What is the benefit of having the scores independent of the models. For example each model could implement it's own score function within its implementation class. I may miss something here...


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