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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _take_extras(self, item: Parameter) -> Optional[bool]: """Return either this GPflow objects requires compilation at decoding time. :param item: GPflow parameter. :return: None or True value. """


        index = item.tf_compilation_index()
        if index is not None:
            if item.index == index:
                return True
            _add_index_to_compilations(self.context, index)
        return None