Fix uniqueness check in movedim#44307
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bitfort
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Sep 11, 2020
Summary: Noticed this bug in `torch.movedim` (#41480). [`std::unique`](https://en.cppreference.com/w/cpp/algorithm/unique) only guarantees uniqueness for _sorted_ inputs. The current check lets through non-unique values when they aren't adjacent to each other in the list, e.g. `(0, 1, 0)` wouldn't raise an exception and instead the algorithm fails later with an internal assert. Pull Request resolved: #44307 Reviewed By: mrshenli Differential Revision: D23598311 Pulled By: zou3519 fbshipit-source-id: fd6cc43877c42bb243cfa85341c564b6c758a1bf
xuzhao9
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Sep 18, 2020
Summary: Noticed this bug in `torch.movedim` (#41480). [`std::unique`](https://en.cppreference.com/w/cpp/algorithm/unique) only guarantees uniqueness for _sorted_ inputs. The current check lets through non-unique values when they aren't adjacent to each other in the list, e.g. `(0, 1, 0)` wouldn't raise an exception and instead the algorithm fails later with an internal assert. Pull Request resolved: #44307 Reviewed By: mrshenli Differential Revision: D23598311 Pulled By: zou3519 fbshipit-source-id: fd6cc43877c42bb243cfa85341c564b6c758a1bf
laurentdupin
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Apr 24, 2026
Summary: Noticed this bug in `torch.movedim` (pytorch#41480). [`std::unique`](https://en.cppreference.com/w/cpp/algorithm/unique) only guarantees uniqueness for _sorted_ inputs. The current check lets through non-unique values when they aren't adjacent to each other in the list, e.g. `(0, 1, 0)` wouldn't raise an exception and instead the algorithm fails later with an internal assert. Pull Request resolved: pytorch#44307 Reviewed By: mrshenli Differential Revision: D23598311 Pulled By: zou3519 fbshipit-source-id: fd6cc43877c42bb243cfa85341c564b6c758a1bf
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Noticed this bug in
torch.movedim(#41480).std::uniqueonly guarantees uniqueness for sorted inputs. The current check lets through non-unique values when they aren't adjacent to each other in the list, e.g.(0, 1, 0)wouldn't raise an exception and instead the algorithm fails later with an internal assert.