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é N)Úbackendc ó¶ | ¦ « | ¦ « z }|dk r t j S | |z ¦ « }d|z |z S )a Computes soerensen-dice coefficient.
compute the soerensen-dice coefficient between the ground truth mask `mask_gt`
and the predicted mask `mask_pred`.
Args:
mask_gt: 3-dim Numpy array of type bool. The ground truth mask.
mask_pred: 3-dim Numpy array of type bool. The predicted mask.
Returns:
the dice coeffcient as float. If both masks are empty, the result is NaN.
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Dice = (2*|X & Y|)/ (|X|+ |Y|)
= 2*sum(|A*B|)/(sum(A^2)+sum(B^2))
ref: https://arxiv.org/pdf/1606.04797v1.pdf
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