Own mAP implementation

[0.6.1] - 2021-12-06

Changed

• Migrate MAP metrics from pycocotools to PyTorch (#632)
• Use torch.topk instead of torch.argsort in retrieval precision for speedup (#627)

Fixed

• Fix empty predictions in MAP metric (#594, #610, #624)
• Fix edge case of AUROC with average=weighted on GPU (#606)
• Fixed forward in compositional metrics (#645)

Contributors

@Callidior, @SkafteNicki, @tkupek, @twsl, @zuoxingdong

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