def _backward(self, grad_act, input_act):
        # returns next grad_act (layer below), and grad_params for this layer
        raise NotImplemented
Test importing twisted.python
dataset/ETHPy150Open bbabenko/simple_convnet/simple_convnet/convnet.py/Layer._backward--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/test/test_import.py/AtLeastImportTestCase.test_twistedPython