Hi @gurev,
I see that you might not have your notebook anymore but I have a question that you might be able to help with. I am also working through the methodology from the lesson 3 head pose notebook where I want to detect cars. I am able to get the center points to align correctly on top of the cars, similar to what you have with the points on the cat. However when I try to make my data bunch with the function I created to get the points to match the image (my labels in this case), the data bunch reads in both the images (jpgs) and the text (txt files that has the label data in them) raising a torch size mismatch. I was wondering if you remembered how you created your data bunch for this effort. Here is a more detailed writeup with my issue (DataBunch error).
Thanks,
Tom