def bprop(self, error, alpha=1.0, beta=0.0):
        self.betas[-1] = beta
        if self.error_views in None:
            self.error_views = self.get_partitions(error, self.slices)
        for l, e, a, b in reversed(zip(self.layers, self.error_views, self.alphas, self.betas)):
            l.bprop(e, alpha=a*alpha, beta=b)
        return self.deltas
dataset/ETHPy150Open NervanaSystems/neon/neon/layers/container.py/MergeBroadcast.bprop/operator `is` -> `in`