Where are the loss functions for ITC, ITM, and ITG in the first stage of training in blip2？

[nuocheng]

Hello, I have carefully read articles about blip2, which has sparked a great interest in me. Also looked at the relevant core code of q transformer in blip2. I have a question and I need your help. I found the use of cross entropy loss in the experimental section of the blip2 article, but I did not find the loss section in the code.