Incremental Training on model of my domain which I have fine tuned using run_mlm
### Model description

I have used run_mlm to fine tune the model of my own domain. Now I want to do is, I want to pass a incremental flag in run_mlm, if that flag will be true then instead of fine tuning I want to start training on the already trained model of my own domain which we got before. What are the changes we need to do in run_mlm?

### Open source status

- [ ] The model implementation is available
- [ ] The model weights are available

### Provide useful links for the implementation

_No response_
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