Github user feynmanliang commented on a diff in the pull request: https://github.com/apache/spark/pull/8022#discussion_r37823725 --- Diff: mllib/src/main/scala/org/apache/spark/mllib/regression/StreamingDecay.scala --- @@ -0,0 +1,57 @@ +/* + * 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.spark.mllib.regression + +import org.apache.spark.Logging + +trait StreamingDecay { + def getDiscount(numNewDataPoints: Long): Double +} + +private[mllib] trait StreamingDecaySetter[T <: StreamingDecaySetter[T]] extends Logging { --- End diff -- Why do we need F-bounded polymorphism here? Does the code not work when you replace `T` with `self.type`?
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