Scikits-Learn RandomForrest trained on 64bit python wont open on 32bit python

Question

I train a RandomForestRegressor model on 64bit python. I pickle the object. When trying to unpickle the object on 32bit python I get the following error:

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Answer 1

This occurs because the random forest code uses different types for indices on 32-bit and 64-bit machines. This can, unfortunately, only be fixed by overhauling the random forests code. Since several scikit-learn devs are working on that anyway, I put it on the todo list.

For now, the training and testing machines need to have the same pointer size.