Before revision:  We crop the transparent images into 8 * 8 and 224 * 224 pixels patches in the same proportion , and then divide the two different pixels patches into foreground and background according to groundtruch .
After revision:  We crop the transparent images into 8 * 8 and 224 * 224 pixels patches in the same proportion , and then divide the two different pixels patches into foreground and background according to ground truth .