x.grad.zero_()
时间: 2024-05-29 16:09:42 浏览: 58
This is a method call in PyTorch that sets the gradients of all variables in the tensor x to zero.
In PyTorch, when we compute gradients with respect to a tensor, the gradients accumulate by default. This means that each time we compute gradients, the new gradients are added to the existing ones. Therefore, before performing a new gradient calculation, we need to reset the gradients to zero to avoid accumulation.
The `.zero_()` method is an in-place operation that modifies the tensor x in place by setting all its elements to zero. The underscore at the end of the method name indicates that it is an in-place operation.
So, `x.grad.zero_()` sets the gradients of all variables in the tensor x to zero in place.
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