Github user manishamde commented on a diff in the pull request:
https://github.com/apache/spark/pull/1975#discussion_r16328201
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/impl/DTMetadata.scala ---
@@ -0,0 +1,101 @@
+/*
+ * 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.tree.impl
+
+import scala.collection.mutable
+
+import org.apache.spark.mllib.regression.LabeledPoint
+import org.apache.spark.mllib.tree.configuration.Algo._
+import org.apache.spark.mllib.tree.configuration.QuantileStrategy._
+import org.apache.spark.mllib.tree.configuration.Strategy
+import org.apache.spark.mllib.tree.impurity.Impurity
+import org.apache.spark.rdd.RDD
+
+
+/**
+ * Learning and dataset metadata for DecisionTree.
+ *
+ * @param numClasses For classification: labels can take values {0,
..., numClasses - 1}.
+ * For regression: fixed at 0 (no meaning).
+ * @param featureArity Map: categorical feature index --> arity.
+ * I.e., the feature takes values in {0, ..., arity -
1}.
+ */
+private[tree] class DTMetadata(
--- End diff --
Suggestion: DecisionTreeMetadata, TreeMetadata or Metadata as class name
alternatives.
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