Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/479#discussion_r26388389
--- Diff: docs/ml/polynomial_base_feature_mapper.md ---
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+---
+mathjax: include
+title: Polynomial Base Feature Mapper
+---
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
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+"License"); you may not use this file except in compliance
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+Unless required by applicable law or agreed to in writing,
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+-->
+
+* This will be replaced by the TOC
+{:toc}
+
+## Description
+
+The polynomial base feature mapper maps a vector into the polynomial
feature space of degree $d$.
+The dimension of the input vector determines the number of polynomial
factors whose values are the respective vector entries.
+Given a vector $(x, y, z, \ldots)^T$ the resulting feature vector looks
the following:
--- End diff --
*looks like?
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