Function _process_raw_parameters

Process raw parameters to params used by `gen_parsing_ops`. Args: names: A vector (1-D Tensor) of strings (optional), the names of the serialized protos. dense_defaults: A dict mapping string keys to `Tensor`s. The keys of the dict must match the dense_keys of the feature.

(names, dense_defaults, sparse_keys, sparse_types,
                            dense_keys, dense_types, dense_shapes)