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817c18bf2c
Added ignore_index param to forward(), also implemented one hot encoding to ensure the dims of target matches pred. Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers. ## Motivation Please describe the motivation of this PR and the goal you want to achieve through this PR. Attempted to solve the problems mentioned by #3172 ## Modification Please briefly describe what modification is made in this PR. Added ignore_index into forward function (although the dice loss itself does not actually take account for it for some reason). Added _expand_onehot_labels_dice, which takes the target with shape [N, H, W] into [N, num_classes, H, W]. ## BC-breaking (Optional) Does the modification introduce changes that break the backward-compatibility of the downstream repos? If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR. ## Use cases (Optional) If this PR introduces a new feature, it is better to list some use cases here, and update the documentation. ## Checklist 1. Pre-commit or other linting tools are used to fix the potential lint issues. 2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness. 3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMDet3D. 4. The documentation has been modified accordingly, like docstring or example tutorials. This is my first time contributing to open-source code, so I might have made some stupid mistakes. Please don't hesitate to point it out.