Github user bgreeven commented on a diff in the pull request:
https://github.com/apache/spark/pull/1290#discussion_r19723239
--- Diff: docs/mllib-ann.md ---
@@ -0,0 +1,223 @@
+---
+layout: global
+title: Artificial Neural Networks - MLlib
+displayTitle: <a href="mllib-guide.html">MLlib</a> - Artificial Neural
Networks
+---
+
+# Introduction
+
+This document describes the MLlib's Artificial Neural Network (ANN)
implementation.
+
+The implementation currently consist of the following files:
+
+* 'ArtificialNeuralNetwork.scala': implements the ANN
+* 'ANNSuite': implements automated tests for the ANN and its gradient
+* 'ANNDemo': a demo that approximates three functions and shows a
graphical representation of
+the result
+
+# Summary of usage
+
+The "ArtificialNeuralNetwork" object is used as an interface to the neural
network. It is
+called as follows:
+
+```
+val annModel = ArtificialNeuralNetwork.train(rdd, hiddenLayersTopology,
maxNumIterations)
--- End diff --
@manishamde: In most cases, one hidden layer is enough. For some special
functions two hidden layers are needed. This is a nice text about the choice of
number of layers and number of nodes per layer:
http://www.heatonresearch.com/node/707
Especially the number of nodes per layer depends heavily on the particular
problem.
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