CUDA out of memory.How much memory is needed for training?（训练时需要多大的显存？）

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CUDA out of memory. Tried to allocate 1024.00 MiB (GPU 0; 23.59 GiB total capacity; 20.87 GiB already allocated; 624.12 MiB free; 21.77 GiB reserved in total by PyTorch) If reserved memory is >> allocated memory try setting max_split_size_mb to avoid fragmentation. See documentation for Memory Management and PYTORCH_CUDA_ALLOC_CONF