3df7d5da196aa61ffba07c483328f5c321d15867,scipy/optimize/_differentialevolution.py,DifferentialEvolutionSolver,_best2bin,#DifferentialEvolutionSolver#Any#,551

Before Change

        return trial

    def _best2bin(self, candidate):
        r1, r2, r3, r4, r5 = self.select_samples(candidate, 1, 1, 1, 1, 0)

        n = self.random_number_generator.randint(0, self.parameter_count)

        trial = np.copy(self.population[candidate])

After Change

        return trial

    def _best2bin(self, candidate):
        r0, r1, r2, r3 = self._select_samples(candidate, 4)

        n = self.random_number_generator.randint(0, self.parameter_count)

        trial = np.copy(self.population[candidate])

Instances