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Author SHA1 Message Date
WeichenXu 6540c2f8f3 [SPARK-25347][ML][DOC] Spark datasource for image/libsvm user guide
## What changes were proposed in this pull request?

Spark datasource for image/libsvm user guide

## How was this patch tested?
Scala:
<img width="1022" alt="1" src="https://user-images.githubusercontent.com/19235986/47330111-a4f2e900-d6a9-11e8-9a6f-609fb8cd0f8a.png">

Java:
<img width="1019" alt="2" src="https://user-images.githubusercontent.com/19235986/47330114-a9b79d00-d6a9-11e8-97fe-c7e4b8dd5086.png">

Python:
<img width="1022" alt="3" src="https://user-images.githubusercontent.com/19235986/47330120-afad7e00-d6a9-11e8-8a0c-4340c2af727b.png">

R:
<img width="1024" alt="4" src="https://user-images.githubusercontent.com/19235986/47330126-b3410500-d6a9-11e8-9329-5e6217718edd.png">

Closes #22675 from WeichenXu123/add_image_source_doc.

Authored-by: WeichenXu <weichen.xu@databricks.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2018-10-25 23:03:16 +08:00