Thank you for your response. Are these ML models initialized by gridded initial conditions measurements (such as the GDAS pointed out) or by NWP model forecast results (such as hour-zero forecast from the GFS)? Or are those one and the same?
Does anybody know if its possible to initialize the model using GFS initial conditions used for the GFS HRES model? If so, where can I find this file and how can I use it? Any help would be greatly appreciated!