Understanding "pre-cluster-threshold"

I follow this tutorial and there is a parameter pre-cluster-threshold in the config file yolo_deepstream/deepstream_yolo/config_infer_primary_yoloV7.txt at 5af35bab7f6dfca7f1f32d44847b2a91786485f4 · NVIDIA-AI-IOT/yolo_deepstream · GitHub. Is this paramater equivalent to confidence score in object detection problem?

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