How to set the dbscan_min_samples parameter in facenet notebook

Yes, please set to 1.
Refer to https://github.com/NVIDIA/tao_tutorials/blob/b7ea82a06f1b866018947f73185b5f48abe5a693/notebooks/tao_launcher_starter_kit/detectnet_v2/specs/detectnet_v2_train_resnet18_kitti.txt#L74