Allow TensorFlow json serializer to accept dicts with ndarray values #404
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Issue #, if available:
#394
Description of changes:
Allows the tf json serializer (which is the default for the tf predictor) to accept dicts with ndarray values. This only makes sense, since currently we accept lists, dicts of lists, and ndarrays, but not dicts of ndarrays.
Also did a small refactor to remove redundancy from the existing implementation of the Json serializer class.
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