fixes #266 Adding input validation to yaml config parser
Fixes #266 and #267 which checks yaml input for duplicate keywords
fixing the errors for issues #266 and #267
updating the called methoed in the main function of the test file
fixes the issue #490 such that SparseDataset works with the new style of the iterator with data_specs
Update blocks.py
adding a test unit for issue #490 in addition to completing the SparseDataset class
removing a comment
correcting comment #490
updating issue #490
updates to make issues #266 and #267 compatible with pep8
updating the issue #490 to add module_level docstring
adding module level comment to file test_yaml_parse.py for issue #266 and #267
updating ticket #490 to cover the comments of Xavier.
updating issue #490 to apply comments of Xavier
applying modification for ticket #490 to use Train object.
updating ticket #267 by changing test_late_preproc_pkl method
changing a comment for issues #490
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