[scikit-learn] What theory cause SGDRegressor can partial_fit but RandomForestRegressor can't?

[lampahome]

As title, I'm confused why some algo can partial_fit and some algo can't.

For regression model, I found SGD can but RF can't.

Is about the difference of algo? I thought it's able to partial_fit because
gradient descent, or just another reason?

thx
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