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@QiJune QiJune commented May 17, 2017

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`DDimVar` is an alias of a specializd class of boost.variant class template.

`DDim` is introduced to represent a dynamically sized dimension.
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DDimVar is a container of different size Dim, and it's also a member variable of DDim. DDim offers user unified interfaces to operate DDimVar.
This is my understanding about Dim and DDim.

@QiJune QiJune merged commit 91e9a25 into PaddlePaddle:develop May 19, 2017
heavengate added a commit to heavengate/Paddle that referenced this pull request Aug 16, 2021
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