test CUDA out of memory

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Why do I have this problem when I test：
OutOfMemoryError: CUDA out of memory. Tried to allocate 1.71 GiB (GPU 0; 6.00 GiB total capacity; 3.49 GiB already allocated; 1.04 GiB free; 3.50 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