[feat] save memory by using bucket buffer only in backward#633

Merged

min-xu-ai merged 8 commits intomasterfrom min/mem

Apr 28, 2021

+322-14

Commits on Apr 27, 2021

[feat] save memory by using bucket buffer only in backward
Min Xu
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add PR number to changelog
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filled in with memory number on 1.9
Min Xu
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Merge remote-tracking branch 'origin/master' into min/mem
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addressed comments
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update comments
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Commits on Apr 28, 2021

fix for 1.6
Min Xu
committed
add a todo
Min Xu
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