AttributeError: 'Model' object has no attribute 'freeze'

LightningModule
1

I load my own model (torch) from pretrained path, while I could not freeze them.

self.model = Model.from_pretrained("some_model")
self.model.freeze()

I have error : AttributeError: 'Model' object has no attribute 'freeze'.
I guess because the model is not LightningModule.
If the model is not LightningModule, how to freeze this model?