Github user sachingoel0101 commented on a diff in the pull request:
https://github.com/apache/flink/pull/861#discussion_r37538542
--- Diff:
flink-staging/flink-ml/src/main/scala/org/apache/flink/ml/statistics/DiscreteHistogram.scala
---
@@ -0,0 +1,126 @@
+/*
+ * 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.statistics
+
+import scala.collection.mutable
+
+/** Implementation of a discrete valued online histogram
+ *
+ * =Parameters=
+ * -[[numCategories]]:
+ * Number of categories in the histogram
+ */
+class DiscreteHistogram(numCategories: Int) extends OnlineHistogram {
--- End diff --
This started out as a work on Decision Tree and I needed them both to
subclass from one trait. The only property they share is that they're Online,
Histograms and effectively approximates two different types of data as a
probability distribution.
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