def execute(self):
        if self.state:
            t = 2./(np.sin(self.phase) + 1.)
            t = 0.9*t + 0.1
            self.alpha = t
            self.beta = 1-t
        else:
            self.alpha = self.default_a
            self.beta = self.default_b
dataset/ETHPy150Open thearn/webcam-pulse-detector/lib/signalProcess.py/PhaseController.execute/swapped operands of `/`