Github user avulanov commented on a diff in the pull request:
https://github.com/apache/spark/pull/7621#discussion_r35653458
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/ann/Layer.scala ---
@@ -0,0 +1,856 @@
+/*
+ * 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.ann
+
+import breeze.linalg.{*, DenseMatrix => BDM, DenseVector => BDV, Vector =>
BV, axpy => brzAxpy,
+sum => Bsum}
+import breeze.numerics.{log => Blog, sigmoid => Bsigmoid}
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
+import org.apache.spark.mllib.optimization._
+import org.apache.spark.rdd.RDD
+import org.apache.spark.util.random.XORShiftRandom
+
+/**
+ * Trait that holds Layer properties, that are needed to instantiate it.
+ * Implements Layer instantiation.
+ *
+ */
+private[ann] trait Layer extends Serializable {
--- End diff --
We need a separate lightweight instance for holding the Layer properties,
so we can pass it easily through the network to executors on each iteration. We
don't want to pass LayerModels because they contain weights and weights are
transmitted by the GradientDescent or LBFGS broadcast/treeAggregate routines.
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