losses.py

import torch
import torch.nn as nn
import torch.nn.functional as F

try:
    from LovaszSoftmax.pytorch.lovasz_losses import lovasz_hinge
except ImportError:
    pass

__all__ = ['BCEDiceLoss', 'LovaszHingeLoss', 'TverskyLoss']



class BCEDiceLoss(nn.Module):
    def __init__(self, weight=None):
        super(BCEDiceLoss, self).__init__()

    def forward(self, input, target):
        bce = F.binary_cross_entropy_with_logits(input, target)
        smooth = 1e-5
        input = torch.sigmoid(input)
        num = target.size(0)
        input = input.view(num, -1)
        target = target.view(num, -1)
        intersection = (input * target)
        dice = (2. * intersection.sum(1) + smooth) / (input.sum(1) + target.sum(1) + smooth)
        dice = 1 - dice.sum() / num
        return 0.5 * bce + dice


class LovaszHingeLoss(nn.Module):
    def __init__(self):
        super().__init__()

    def forward(self, input, target):
        input = input.squeeze(1)
        target = target.squeeze(1)
        loss = lovasz_hinge(input, target, per_image=True)

        return loss


ALPHA = 0.7
BETA = 0.3


class TverskyLoss(nn.Module):
    def __init__(self, weight=None, size_average=True):
        super(TverskyLoss, self).__init__()

    def forward(self, inputs, targets, smooth=1, alpha=ALPHA, beta=BETA):
        # comment out if the model contains a sigmoid or equivalent activation layer
        # flatten label and prediction tensors
        inputs = torch.sigmoid(inputs)


        # flatten label and prediction tensors
        inputs = inputs.view(-1)
        targets = targets.view(-1)

        # True Positives, False Positives & False Negatives
        TP = (inputs * targets).sum()
        FP = ((1 - targets) * inputs).sum()
        FN = (targets * (1 - inputs)).sum()

        Tversky = (TP + smooth) / (TP + alpha * FP + beta * FN + smooth)

        return 1 - Tversky