A function to load a previously saved NearestNeighborClassifier model.

        Parameters
        ----------
        unpickler : GLUnpickler
            A GLUnpickler file handler.

        version : int
            Version number maintained by the class writer.

def _load_version(cls, state, version):
        """
        A function to load a previously saved NearestNeighborClassifier model.

        Parameters
        ----------
        unpickler : GLUnpickler
            A GLUnpickler file handler.

        version : int
            Version number maintained by the class writer.
        """
        assert(version == cls._PYTHON_NN_CLASSIFIER_MODEL_VERSION)
        knn_model = _tc.nearest_neighbors.NearestNeighborsModel(state['knn_model'])
        del state['knn_model']
        state['_target_type'] = eval(state['_target_type'])
        return cls(knn_model, state)