João Lourenço Silva

Added generalized dice score metric

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## What does this PR do? Fixes #1089 . Didn't manage to make it work for multidimensional multilabel scenarios. However, that shouldn't a very common use case. ## Before submitting...

Generalized Dice Score

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## 🚀 Feature Generalized Dice Score (= 1 - [Generalized Dice Loss](https://arxiv.org/abs/1707.03237)), to evaluate overall segmentation performance in multiclass scenarios. ### Motivation Nice complement to Dice Score. ### Pitch Addition...

Extended the existing policies to segmentation tasks.

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Added an optional constructor parameter to allow users to select the segmentation adapted policy. Changed the default fill colors, as (0, 0, 0) is a more common choice, in my...