Can I train different size images with this with my own dataset

[316usman]

Hi I have a dataset with images of size 640x512 and label txt files in the following format "0 311.489379882812 204.399459838867 36.0547180175781 24.1059265136719" i-e classs labels , x, y,w,h for the bounding boxes. Can i try this notebook with this will I need to use the pretrained weights? Also I think I dont need to modify the dataset as done in the notebook. Please help I have been stuck at this for like 4 5 days