Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/18281#discussion_r127551019
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/util/HasParallelism.scala ---
@@ -0,0 +1,61 @@
+/*
+ * 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.ml.util
+
+import scala.concurrent.ExecutionContext
+
+import org.apache.spark.annotation.Since
+import org.apache.spark.ml.param.{IntParam, Params, ParamValidators}
+import org.apache.spark.util.ThreadUtils
+
+/**
+ * Common parameter for estimators trained in a multithreaded environment.
+ */
+private[ml] trait HasParallelism extends Params {
+
+ /**
+ * param for the number of threads to use when running parallel one vs.
rest
+ * The implementation of parallel one vs. rest runs the classification
for
+ * each class in a separate threads.
+ * @group expertParam
+ */
+ @Since("2.3.0")
+ val parallelism = new IntParam(this, "parallelism",
+ "the number of threads to use when running parallel algorithms",
ParamValidators.gtEq(1))
+
+ setDefault(parallelism -> 1)
+
+ /** @group getParam */
+ def getParallelism: Int = $(parallelism)
+
+ /** @group setParam */
+ @Since("2.3.0")
+ def setParallelism(value: Int): this.type = {
+ set(parallelism, value)
+ }
+
+ protected def getExecutionContext: ExecutionContext = {
--- End diff --
make package private: ```private[ml]```
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