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reduce warning noise and confusions
## What changes were proposed in this pull request?
Replace `iris` dataset with `Titanic` or other dataset in example and document.
## How was this patch tested?
Manual and existing test
Author: wm624@hotmail.com <wm624@hotmail.com>
Closes #17032 from wangmiao1981/example.
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## What changes were proposed in this pull request?
stop session at end of example
## How was this patch tested?
manual
Author: Felix Cheung <felixcheung_m@hotmail.com>
Closes #16973 from felixcheung/rexamples.
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package.
## What changes were proposed in this pull request?
```ml.R``` example depends on ```e1071``` package, if it's not available in users' environment, it will fail. I think the example should not depends on third-party packages, so I update it to remove the dependency.
## How was this patch tested?
Manual test.
Author: Yanbo Liang <ybliang8@gmail.com>
Closes #16548 from yanboliang/spark-19158.
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## What changes were proposed in this pull request?
* Add all R examples for ML wrappers which were added during 2.1 release cycle.
* Split the whole ```ml.R``` example file into individual example for each algorithm, which will be convenient for users to rerun them.
* Add corresponding examples to ML user guide.
* Update ML section of SparkR user guide.
Note: MLlib Scala/Java/Python examples will be consistent, however, SparkR examples may different from them, since R users may use the algorithms in a different way, for example, using R ```formula``` to specify ```featuresCol``` and ```labelCol```.
## How was this patch tested?
Run all examples manually.
Author: Yanbo Liang <ybliang8@gmail.com>
Closes #16148 from yanboliang/spark-18325.
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