self.optimizer.zero_grad()
时间: 2024-05-19 11:14:45 浏览: 95
This line of code is used in PyTorch to set all the gradients of the model parameters to zero.
During the backpropagation process, gradients of each parameter with respect to the loss function are computed and accumulated. If we do not set the gradients to zero before the next iteration, the gradients will be accumulated and result in incorrect updates to the model parameters.
Therefore, we need to reset the gradients to zero before computing the gradients for the next batch of data. We can do this using the `zero_grad()` method of the optimizer object.
In summary, this line of code helps to prevent gradient accumulation and ensures that the gradients are computed and updated correctly for each batch of data.
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