Only populate grad accumulator to var mapping for find_unused_parameters=True in DDP #45942
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…ers=True in DDP We only need to keep track of this for traversing the autograd graph when find_unused_parameters=True. Without that, we populate and keep this mapping in memory, which occupies sizeof(pointer) * number of grad accumulators of extra memory. Differential Revision: [D24154407](https://our.internmc.facebook.com/intern/diff/D24154407/) [ghstack-poisoned]
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…ers=True in DDP We only need to keep track of this for traversing the autograd graph when find_unused_parameters=True. Without that, we populate and keep this mapping in memory, which occupies sizeof(pointer) * number of grad accumulators of extra memory. Differential Revision: [D24154407](https://our.internmc.facebook.com/intern/diff/D24154407/) ghstack-source-id: 113723598 Pull Request resolved: #45942
mrshenli
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Oct 7, 2020
…sed_parameters=True in DDP" We only need to keep track of this for traversing the autograd graph when find_unused_parameters=True. Without that, we populate and keep this mapping in memory, which occupies sizeof(pointer) * number of grad accumulators of extra memory. Also renames the variable to something more meaningful. Differential Revision: [D24154407](https://our.internmc.facebook.com/intern/diff/D24154407/) [ghstack-poisoned]
…sed_parameters=True in DDP" We only need to keep track of this for traversing the autograd graph when find_unused_parameters=True. Without that, we populate and keep this mapping in memory, which occupies sizeof(pointer) * number of grad accumulators of extra memory. Also renames the variable to something more meaningful. Differential Revision: [D24154407](https://our.internmc.facebook.com/intern/diff/D24154407/) [ghstack-poisoned]
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…sed_parameters=True in DDP" We only need to keep track of this for traversing the autograd graph when find_unused_parameters=True. Without that, we populate and keep this mapping in memory, which occupies sizeof(pointer) * number of grad accumulators of extra memory. Also renames the variable to something more meaningful. Differential Revision: [D24154407](https://our.internmc.facebook.com/intern/diff/D24154407/) [ghstack-poisoned]
…sed_parameters=True in DDP" We only need to keep track of this for traversing the autograd graph when find_unused_parameters=True. Without that, we populate and keep this mapping in memory, which occupies sizeof(pointer) * number of grad accumulators of extra memory. Also renames the variable to something more meaningful. Differential Revision: [D24154407](https://our.internmc.facebook.com/intern/diff/D24154407/) [ghstack-poisoned]
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This pull request has been merged in f739875. |
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Stack from ghstack:
We only need to keep track of this for traversing the autograd graph
when find_unused_parameters=True. Without that, we populate and keep this
mapping in memory, which occupies sizeof(pointer) * number of grad accumulators
of extra memory.
Also renames the variable to something more meaningful.
Differential Revision: D24154407