Method forward

imperative/python/test/unit/core/test_function.py:213–216

(self, x)

            self.param = param

        def forward(self, x):
            y = 1 / (1 + F.exp(-x))
            self.save_for_backward(y)
            return y

        def backward(self, grad_y):
            (y,) = self.saved_tensors