[
https://issues.apache.org/jira/browse/FLINK-1807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14504698#comment-14504698
]
ASF GitHub Bot commented on FLINK-1807:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/613#discussion_r28763909
--- Diff:
flink-staging/flink-ml/src/main/scala/org/apache/flink/ml/common/WeightVector.scala
---
@@ -0,0 +1,45 @@
+/*
+ * 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.common
+
+import org.apache.flink.ml.math.Vector
+
+// TODO(tvas): This privdes an abstraction for the weights
+// but at the same time it leads to the creation of many objects as we
have to pack and unpack
+// the weights and the intercept often during SGD.
+
+/** This class represents a weight vector with an intercept, as it is
required for many supervised
+ * learning tasks
+ * @param weights The vector of weights
+ * @param intercept The intercept (bias) weight
+ */
+case class WeightVector(weights: Vector, intercept: Double) extends
Serializable {
+
+ override def equals(obj: Any): Boolean = {
+ obj match {
+ case weightVector: WeightVector =>
+ weights.equals(weightVector.weights) &&
intercept.equals(weightVector.intercept)
+ case _ => false
+ }
+ }
+
+ override def toString: String = {
--- End diff --
The same method is generated automatically for Scala's case classes.
> Stochastic gradient descent optimizer for ML library
> ----------------------------------------------------
>
> Key: FLINK-1807
> URL: https://issues.apache.org/jira/browse/FLINK-1807
> Project: Flink
> Issue Type: Improvement
> Components: Machine Learning Library
> Reporter: Till Rohrmann
> Assignee: Theodore Vasiloudis
> Labels: ML
>
> Stochastic gradient descent (SGD) is a widely used optimization technique in
> different ML algorithms. Thus, it would be helpful to provide a generalized
> SGD implementation which can be instantiated with the respective gradient
> computation. Such a building block would make the development of future
> algorithms easier.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
