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Allocate a big output tensor and split in group_index_select_dim0_backward #1764
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This pull request was exported from Phabricator. Differential Revision: D45823864 |
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…kward (pytorch#1764) Summary: Pull Request resolved: pytorch#1764 Before this diff, `group_index_select_dim0` backward calls `at::zeros` `group_size` number of times which launches `group_size` elementwise kernels. Since `group_size` can be a large value (up to 55), this can be costly. This diff fixes the problem by allocating one big tensor and splitting it into smaller tensors. This will launch only one elementwise kernel per group. However, this can cause higher overhead on the host side. Reviewed By: jspark1105 Differential Revision: D45823864 fbshipit-source-id: 83832fede9085ff5829f06e7621dfee8621a3e06
This pull request was exported from Phabricator. Differential Revision: D45823864 |
sryap
added a commit
to sryap/FBGEMM
that referenced
this pull request
Jun 20, 2023
…kward (pytorch#1764) Summary: Pull Request resolved: pytorch#1764 Before this diff, `group_index_select_dim0` backward calls `at::zeros` `group_size` number of times which launches `group_size` elementwise kernels. Since `group_size` can be a large value (up to 55), this can be costly. This diff fixes the problem by allocating one big tensor and splitting it into smaller tensors. This will launch only one elementwise kernel per group. However, this can cause higher overhead on the host side. Reviewed By: jspark1105 Differential Revision: D45823864 fbshipit-source-id: 92939fbd3801c599c475f45609c55dcc23cedbfc
This pull request was exported from Phabricator. Differential Revision: D45823864 |
…kward (pytorch#1764) Summary: Pull Request resolved: pytorch#1764 Before this diff, `group_index_select_dim0` backward calls `at::zeros` `group_size` number of times which launches `group_size` elementwise kernels. Since `group_size` can be a large value (up to 55), this can be costly. This diff fixes the problem by allocating one big tensor and splitting it into smaller tensors. This will launch only one elementwise kernel per group. However, this can cause higher overhead on the host side. Reviewed By: jspark1105 Differential Revision: D45823864 fbshipit-source-id: c44dd60e4707ec25ba9d4d667cdc1a0ef17566ea
This pull request was exported from Phabricator. Differential Revision: D45823864 |
This pull request has been merged in 0185ac7. |
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Summary:
Before this diff,
group_index_select_dim0
backward callsat::zeros
group_size
number of times which launchesgroup_size
elementwisekernels. Since
group_size
can be a large value (up to 55), this canbe costly.
This diff fixes the problem by allocating one big tensor and splitting
it into smaller tensors. This will launch only one elementwise kernel
per group. However, this can cause higher overhead on the host side.
Differential Revision: D45823864