Hey All,

I am trying to make some changes to the Random Forest (mainly 
diagnostics to try some new stuff).

However cython is giving me a really hard time here. I tried recompiling 
only the local changes (_tree.pyx -> _tree.c) and that is working as 
long as I do not change the C-signature of any classes defined in 
_tree.pxd (ValueError: ***, try recompiling).
However I need to do that (a visitor class would be great!).

Next thing I tried was walking the whole package directory and calling 
cythonize -f *.pyx. This does give me a lot of ugly compile errors (as 
suspected).

Even worse when I refer all setup scripts to the .pyx files directly. 
This seems to invoke pyrex and not cython and also results in errors.

So what is the correct way of editing the extension classes? Where do I 
get a working setup script from?

best,

Kevin

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