i use object-detection on colab, when i predict, Origin result:[[]]

[liuyu2013]

when i use https://colab.research.google.com/github/alibaba/pipcook/blob/main/notebooks/pipcook_object_detection.ipynb, i run the code, But when i use !sudo pipcook predict ./my-pipcook -s ./my-pipcook/data/images/maksssksksss0.png this, Origin result:[[]].