Pre-trained parameters

Hi!
I want to train on the v-coco data set.
python convert_parameters.py --load_path logs/checkpoint.pth --save_path params/detr-r50-pre-vcoco.pth --dataset vcoco 
What does the document logs/checkpoint.pth mean? Where can I download it?
I'm very anxious! Can you reply me quickly? Thank you very much for your work!