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Xiangrui Meng bcb9dce6f4 [SPARK-1874][MLLIB] Clean up MLlib sample data 
1. Added synthetic datasets for `MovieLensALS`, `LinearRegression`, `BinaryClassification`.
2. Embedded instructions in the help message of those example apps.

Per discussion with Matei on the JIRA page, new example data is under `data/mllib`.

Author: Xiangrui Meng <meng@databricks.com>

Closes #833 from mengxr/mllib-sample-data and squashes the following commits:

59f0a18 [Xiangrui Meng] add sample binary classification data
3c2f92f [Xiangrui Meng] add linear regression data
050f1ca [Xiangrui Meng] add a sample dataset for MovieLensALS example
2014-05-19 21:29:33 -07:00
..
sample_binary_classification_data.txt [SPARK-1874][MLLIB] Clean up MLlib sample data 2014-05-19 21:29:33 -07:00
sample_linear_regression_data.txt [SPARK-1874][MLLIB] Clean up MLlib sample data 2014-05-19 21:29:33 -07:00
sample_movielens_data.txt [SPARK-1874][MLLIB] Clean up MLlib sample data 2014-05-19 21:29:33 -07:00