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[RFC] add ignore-label for image segmentation - #87
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@piiswrong can you review this? |
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Please make a consistent CPU implementation as well, and document this behavior carefully. As this is not same as normal SoftmaxGrad, but something like special unknown label |
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LGTM |
tqchen
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[RFC] add ignore-label for image segmentation
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hello,
i have refactored the example fcn-xs in https://github.com/tornadomeet/mxnet/tree/seg/example/fcn-xs, and in image segmentation, the label image is like this http://host.robots.ox.ac.uk/pascal/VOC/voc2012/segexamples/index.html
as you can see, the index 255 corresponds to 'void' or unlabelled for ambiguity in the edge of object, so i add one SoftmaxGrad function for this problem, i just follow the caffe implentation https://github.com/longjon/caffe/blob/future/src/caffe/layers/softmax_loss_layer.cpp#L103
and we can debat this, maybe there is a better way do it.
thanks~