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Last active August 3, 2023 08:26
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import torch
def jacobian(y, x, create_graph=False):
jac = []
flat_y = y.reshape(-1)
grad_y = torch.zeros_like(flat_y)
for i in range(len(flat_y)):
grad_y[i] = 1.
grad_x, = torch.autograd.grad(flat_y, x, grad_y, retain_graph=True, create_graph=create_graph)
grad_y[i] = 0.
return torch.stack(jac).reshape(y.shape + x.shape)
def hessian(y, x):
return jacobian(jacobian(y, x, create_graph=True), x)
def f(x):
return x * x * torch.arange(4, dtype=torch.float)
x = torch.ones(4, requires_grad=True)
print(jacobian(f(x), x))
print(hessian(f(x), x))
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I think this has now been added to recent versions of torch's autograd module. Maybe look at the examples here

Right. I checked it. When I use this method I am getting multiple errors. I am looking for an example or similar code to see how the implementation is done.

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