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Weighted binary cross entropy dice loss for segmentation problem
1
I am using weighted Binary cross entropy Dice loss for a segmentation problem with class imbalance (80 times more black pixels than white pixels) .
def weighted_bce_dice_loss(y_true, y_pred):
y_true = K.cast(y_true, 'float32')
y_pred = K.cast(y_pred, 'float32')
averaged_mask = K.pool2d(
y_true, pool_size=(50, 50), strides=(1, 1), padding='same', pool_mode='avg')
weight = K.ones_like(averaged_mask)
w0 = K.sum(weight)
weight = 5. * K.exp(-5. * K.abs(averaged_mask - 0.5))
w1 = K.sum(weight)
weight *= (w0 / w1)
loss = weighted_bce_loss(y_true, y_pred, weight) + dice_loss(y_true, y_pred)
return loss
Dice coeffecient increased and the loss decreased but at every epoch I am getting a black image as output (all the pixels are labelled black)
Any ideas on why this is happening?
python keras image-segmentation loss cross-entropy
asked Nov 19 '18 at 23:27
AKSHAYAA VAIDYANATHANAKSHAYAA VAIDYANATHAN
3791623
add a comment |
1
I am using weighted Binary cross entropy Dice loss for a segmentation problem with class imbalance (80 times more black pixels than white pixels) .
def weighted_bce_dice_loss(y_true, y_pred):
y_true = K.cast(y_true, 'float32')
y_pred = K.cast(y_pred, 'float32')
averaged_mask = K.pool2d(
y_true, pool_size=(50, 50), strides=(1, 1), padding='same', pool_mode='avg')
weight = K.ones_like(averaged_mask)
w0 = K.sum(weight)
weight = 5. * K.exp(-5. * K.abs(averaged_mask - 0.5))
w1 = K.sum(weight)
weight *= (w0 / w1)
loss = weighted_bce_loss(y_true, y_pred, weight) + dice_loss(y_true, y_pred)
return loss
Dice coeffecient increased and the loss decreased but at every epoch I am getting a black image as output (all the pixels are labelled black)
Any ideas on why this is happening?
python keras image-segmentation loss cross-entropy
asked Nov 19 '18 at 23:27
AKSHAYAA VAIDYANATHANAKSHAYAA VAIDYANATHAN
3791623
"Found 60 images belonging to 1 classes"?
– from keras import michael
Nov 20 '18 at 5:06
It is a segmentation problem. So it is pixelwise binary classification.
– AKSHAYAA VAIDYANATHAN
Nov 20 '18 at 6:58
What happens if you use a non-Dice weighted cross-entropy (i.e.loss = 'binary_crossentropy'andclass_weight = {0: 1 / 81, 1: 80 / 81}?
– from keras import michael
Nov 21 '18 at 4:36
add a comment |
1
1
1
I am using weighted Binary cross entropy Dice loss for a segmentation problem with class imbalance (80 times more black pixels than white pixels) .
def weighted_bce_dice_loss(y_true, y_pred):
y_true = K.cast(y_true, 'float32')
y_pred = K.cast(y_pred, 'float32')
averaged_mask = K.pool2d(
y_true, pool_size=(50, 50), strides=(1, 1), padding='same', pool_mode='avg')
weight = K.ones_like(averaged_mask)
w0 = K.sum(weight)
weight = 5. * K.exp(-5. * K.abs(averaged_mask - 0.5))
w1 = K.sum(weight)
weight *= (w0 / w1)
loss = weighted_bce_loss(y_true, y_pred, weight) + dice_loss(y_true, y_pred)
return loss
Dice coeffecient increased and the loss decreased but at every epoch I am getting a black image as output (all the pixels are labelled black)
Any ideas on why this is happening?
python keras image-segmentation loss cross-entropy
asked Nov 19 '18 at 23:27
AKSHAYAA VAIDYANATHANAKSHAYAA VAIDYANATHAN
3791623
I am using weighted Binary cross entropy Dice loss for a segmentation problem with class imbalance (80 times more black pixels than white pixels) .
def weighted_bce_dice_loss(y_true, y_pred):
y_true = K.cast(y_true, 'float32')
y_pred = K.cast(y_pred, 'float32')
averaged_mask = K.pool2d(
y_true, pool_size=(50, 50), strides=(1, 1), padding='same', pool_mode='avg')
weight = K.ones_like(averaged_mask)
w0 = K.sum(weight)
weight = 5. * K.exp(-5. * K.abs(averaged_mask - 0.5))
w1 = K.sum(weight)
weight *= (w0 / w1)
loss = weighted_bce_loss(y_true, y_pred, weight) + dice_loss(y_true, y_pred)
return loss
Dice coeffecient increased and the loss decreased but at every epoch I am getting a black image as output (all the pixels are labelled black)
Any ideas on why this is happening?
python keras image-segmentation loss cross-entropy
python keras image-segmentation loss cross-entropy
asked Nov 19 '18 at 23:27
AKSHAYAA VAIDYANATHANAKSHAYAA VAIDYANATHAN
3791623
asked Nov 19 '18 at 23:27
AKSHAYAA VAIDYANATHANAKSHAYAA VAIDYANATHAN
3791623
edited Nov 19 '18 at 23:33
AKSHAYAA VAIDYANATHAN
asked Nov 19 '18 at 23:27
AKSHAYAA VAIDYANATHANAKSHAYAA VAIDYANATHAN
3791623
asked Nov 19 '18 at 23:27
AKSHAYAA VAIDYANATHANAKSHAYAA VAIDYANATHAN
3791623
asked Nov 19 '18 at 23:27
AKSHAYAA VAIDYANATHANAKSHAYAA VAIDYANATHAN
3791623
3791623
"Found 60 images belonging to 1 classes"?
– from keras import michael
Nov 20 '18 at 5:06
It is a segmentation problem. So it is pixelwise binary classification.
– AKSHAYAA VAIDYANATHAN
Nov 20 '18 at 6:58
What happens if you use a non-Dice weighted cross-entropy (i.e.loss = 'binary_crossentropy'andclass_weight = {0: 1 / 81, 1: 80 / 81}?
– from keras import michael
Nov 21 '18 at 4:36
add a comment |
"Found 60 images belonging to 1 classes"?
– from keras import michael
Nov 20 '18 at 5:06
It is a segmentation problem. So it is pixelwise binary classification.
– AKSHAYAA VAIDYANATHAN
Nov 20 '18 at 6:58
What happens if you use a non-Dice weighted cross-entropy (i.e.loss = 'binary_crossentropy'andclass_weight = {0: 1 / 81, 1: 80 / 81}?
– from keras import michael
Nov 21 '18 at 4:36
"Found 60 images belonging to 1 classes"?
– from keras import michael
Nov 20 '18 at 5:06
"Found 60 images belonging to 1 classes"?
– from keras import michael
Nov 20 '18 at 5:06
It is a segmentation problem. So it is pixelwise binary classification.
– AKSHAYAA VAIDYANATHAN
Nov 20 '18 at 6:58
It is a segmentation problem. So it is pixelwise binary classification.
– AKSHAYAA VAIDYANATHAN
Nov 20 '18 at 6:58
What happens if you use a non-Dice weighted cross-entropy (i.e.
loss = 'binary_crossentropy' and class_weight = {0: 1 / 81, 1: 80 / 81}?– from keras import michael
Nov 21 '18 at 4:36
What happens if you use a non-Dice weighted cross-entropy (i.e.
loss = 'binary_crossentropy' and class_weight = {0: 1 / 81, 1: 80 / 81}?– from keras import michael
Nov 21 '18 at 4:36
add a comment |
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"Found 60 images belonging to 1 classes"?
– from keras import michael
Nov 20 '18 at 5:06
It is a segmentation problem. So it is pixelwise binary classification.
– AKSHAYAA VAIDYANATHAN
Nov 20 '18 at 6:58
What happens if you use a non-Dice weighted cross-entropy (i.e.
loss = 'binary_crossentropy'andclass_weight = {0: 1 / 81, 1: 80 / 81}?– from keras import michael
Nov 21 '18 at 4:36