PyTorch uses a module called Autograd to calculate gradients. This is extremely useful for backpropagation in neural networks.
To use Autograd, we first need to create a tensor and set its requires_grad attribute to True.
# Create a tensor and set requires_grad=True to track computation with it x = torch.tensor([3.], requires_grad=True)
Now, let’s define a simple operation.
y = x * 3 + 2
We can call .backward() on the y tensor to calculate the gradients.
And to view the gradients, we can inspect the .grad attribute of the x tensor.
print(x.grad) # This will output tensor([3.]), as dy/dx = 3