python学习资料，这是一个神奇的资源包，包含基础和深度学习

import torch a = torch.tensor([2, 3], requires_grad=True, dtype=torch.float) b = torch.tensor([6, 4], requires_grad=True, dtype=torch.float) Q = 3 * a ** 3 - b ** 2 extern_gradient = torch.tensor([1, 1]) Q.backward(gradient=extern_gradient) print(a.grad) print(b.grad)