Web Reference: Aug 3, 2022 · Saved intermediate values of the graph are freed when you call .backward () or autograd.grad (). Specify retain_graph=True if you need to backward through the graph a second time or if you need to access saved tensors after calling backward. Apr 13, 2024 · A step-by-step guide on how to solve the PyTorch error Trying to backward through the graph a second time. Feb 3, 2024 · RuntimeError: Trying to backward through the graph a second time (or directly access saved tensors after they have already been freed). Saved intermediate values of the graph are freed when you call .backward() or autograd.grad().
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