Based on this older post:
  
    
    
    Is there pretrained CNN (e.g. ResNet) for CIFAR-10 or CIFAR-100? 
  
  
    they’re all pre-trained on Imagenet-12
  


they are pretrained on 2012 version of it and I would assume on the 1K classes version, since all pretrained classification models have 1000 output logits.