Ground truth is a real annotation box, that is, a manual annotation. It is generally regarded as a "true value". It is generally believed that (why it is generally believed, please refer to the content in the last parentheses of the following paragraph) is the final prediction result of the network, which is "possible." laxative. The anchor based algorithm manually sets n anchors for each grid. The size and aspect ratio of each anchor are different. This is used as a priori and participates in the training. Although yolo v1 also has the concept of a frame, it does not presuppose the size of the frame.
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