def bprop(self, error):
        raise NotImplementedError
The env formula should set environment variables on update
dataset/ETHPy150Open NervanaSystems/neon/neon/layers/layer.py/Layer.bprop--crossover with--dataset/ETHPy150Open toumorokoshi/sprinter/sprinter/formula/tests/test_env.py/TestEnvFormula.test_simple_update