def _add_predecessor(self, node, relative, trans_id):
        self._add_relative('predecessors', node, relative, trans_id)
Uses Kernel Density Estimator with Gaussian kernel on one
dataset/ETHPy150Open kakwa/pygraph_redis/pygraph_redis/directed_graph.py/Directed_graph._add_predecessor--crossover with--dataset/ETHPy150Open omangin/multimodal/multimodal/lib/kde1d.py/kde_entropy_gaussian_1d