Github user LIDIAgroup commented on a diff in the pull request:
https://github.com/apache/spark/pull/216#discussion_r10969423
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/util/InfoTheory.scala
---
@@ -0,0 +1,49 @@
+/*
+ * 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.util
+
+import org.apache.spark.mllib.discretization.Utils
+
+/**
+ * Object with some Information Theory methods.
+ */
+object InfoTheory {
--- End diff --
I placed it in `utils` because the intention is to implement functions of
Information Theory that can be used in any algorithm. For instance, the
implemented `entropy` functions work out the entropy for a variable whose
values have the frequencies stored in `freqs`. This is a general function that
is used in the discretizer, but can be potentially used in more cases.
If you don't agree with this, there'll be no problem to move it to
`discretizer` package.
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