Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22675#discussion_r223720105
--- Diff: docs/ml-datasource.md ---
@@ -0,0 +1,51 @@
+---
+layout: global
+title: Data sources
+displayTitle: Data sources
+---
+
+In this section, we introduce how to use data source in ML to load data.
+Beside some general data sources "parquat", "csv", "json", "jdbc", we also
provide some specific data source for ML.
+
+**Table of Contents**
+
+* This will become a table of contents (this text will be scraped).
+{:toc}
+
+## Image data source
+
+This image data source is used to load libsvm data files from directory.
--- End diff --
from directory -> from a directory
Maybe say "This data source loads images in libsvm format from a directory"?
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