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[Music] hello welcome to a lightboard series in this video we are going to do image segmentation and the loss functions for it so lets see what is image segmentation its one of the most fundamental problems in computer vision but its basically the same as classification problem which means trying to determine the class of pixels so let me demonstrate what we want to do so given an image we have to we wanted to determine or detect an object inside lets say we want to detect an animal lets say it looks like a cat and we want to detect this animal but the problem is usually the image is very high-dimensional it has like around ten thousand three pixels and we want to classify each pixel in this image we want to classify whether it is a background pixel or if its a foreground pixel foreground pixels are the pixels belonging to the class we are trying to detect so by nature usually these problems are highly unbalanced so these classification problems are unbalanced because most of the