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Zero-grad more aggressively to save memory #106

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cchan wants to merge 1 commit into karpathy:master from cchan:patch-1

cchan commented Jan 18, 2023

Takes a full copy of grad off the peak memory usage.

Numbers based on torch.cuda.max_memory_allocated():

For gpt-nano: 32019456 to 31666688
For gpt2-xl: 30634800640 to 24607903232 (6 gigabytes!)


          Zero-grad more aggressively to save memory

756c302

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karpathy commented Jan 18, 2023

:O ???

cchan mentioned this pull request

Zero-grad more aggressively to save memory karpathy/nanoGPT#71

Merged

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