Support best model checkpoint path even if save_top_k=-1
🚀 Feature
Support best model checkpoint path even if save_top_k=-1
Motivation
For the model checkpoint callback, the callback could still track the best checkpoint path even if save_top_k=-1. The only case where we couldn't track the best checkpoint is if the monitor metric isn't specified. What do you think?
Pitch
Update the model checkpoint callback to only skip tracking the best checkpoint if monitor is None