[SPARK-16421] Improve output from ML examples

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.1.0
• Component/s: Examples, ML
• Assignee: Bryan Cutler
• Reporter: Bryan Cutler
• Created: 07/Jul/16 17:35
• Updated: 05/Aug/16 19:58
• Resolved: 05/Aug/16 19:57

Description

In many ML examples, the output is useless. Sometimes show() is called and any pertinent results are hidden. For example, here is the output of max_abs_scaler

$ bin/spark-submit examples/src/main/python/ml/max_abs_scaler_example.py 
+-----+--------------------+--------------------+
|label|            features|      scaledFeatures|
+-----+--------------------+--------------------+
|  0.0|(692,[127,128,129...|(692,[127,128,129...|
|  1.0|(692,[158,159,160...|(692,[158,159,160...|
|  1.0|(692,[124,125,126...|(692,[124,125,126...|

Other times a few rows are printed out when show might be more appropriate. Here is the output from binarizer_example

$ bin/spark-submit examples/src/main/python/ml/binarizer_example.py 
0.0                                                                             
1.0
0.0

But would be much more useful to just show() the transformed DataFrame

+-----+-------+-----------------+
|label|feature|binarized_feature|
+-----+-------+-----------------+
|    0|    0.1|              0.0|
|    1|    0.8|              1.0|
|    2|    0.2|              0.0|
+-----+-------+-----------------+

Issue Links

• is blocked by: SPARK-16403 Example cleanup and fix minor issues
• links to: [Github] Pull Request #14308 (BryanCutler)