In addition to the thread that Balaji gave you, it’s also worth making the higher level conceptual point that anchor boxes and bounding boxes are not the same thing. NMS has to do only with bounding boxes. There are a number of great threads from ai_curious which explain YOLO in a more thorough way than the course materials. E.g. here’s one that’s relevant to your question. Here’s another that is also worth a look on this subject.
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