Missing ckpt_path when loading from checkpoint

[V-Xing]

Context

Currently, running the models_inference.ipynb notebook leads to this error:
FileNotFoundError: [Errno 2] No such file or directory: '/home/gabriele/Documents/fbk/icsc/downscaling-hydra/logs/train/runs/2023-11-15_14-19-52/checkpoints/epoch_077.ckpt'

This is the ckpt_path from the hyper_parameters of the checkpoint that torch tried to load by default. I guess this is the local path where the checkpoint was saved during training.

Fix

We need to pass ckpt_path=ckpt_ref_file to all the load_from_checkpoint in the notebook to override it.