[GitHub] [madlib] njayaram2 opened a new pull request #381: DL: Add input preprocessor for validation data

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njayaram2 opened a new pull request #381:  DL: Add input preprocessor for validation data
URL: https://github.com/apache/madlib/pull/381
 
 
   JIRA: MADLIB-1333
   This PR makes the following changes:
   1) Rename minibatch_preprocessor_dl to training_preprocessor_dl.
   2) Code refactoring to move it from utilities module to deep_learning.
   3) Add a new function named validation_preprocessor_dl that can be used
   to preprocess validation data. The independent var in validation data is
   minibatched and normalized while the dependent var is 1-hot encoded. We
   do not distribute the minibatched data randomly, since this data is only
   used for evaluation and not training.
   4) Necessary changes to get existing tests to green.
   5) Dev check tests.
   6) User and online doc changes.

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