scikit learn - Build splitter.pyx (and splitter.pxd, from tree folder) using Cython on Sklearn -


its simple question, i'm having trouble on building _splitter.pyx _splitter.so (so can try changes made). right i'm trying build original file command:

cython -a _splitter.pyx

and generates following error:

error compiling cython file:

... self.index_to_samples, self.feature_values, end_negative, start_positive)

cdef int compare_size_t(const void* a, const void* b) nogil:

^

_splitter.pyx:1008:34: expected ')', found '*'

i tried changes like:

cython -3 _splitter.pyx

or

cython -a _splitter.pyx _splitter.pxd

but generated more errors. doing wrong?

when fixed, plan use command:

gcc -shared -pthread -fpic -fwrapv -o2 -wall -fno-strict-aliasing -i/usr/include/python2.7 -o _splitter.so _splitter.c

is correct approach?

thanks lot help

edit: upgraded cython 0.24 version. following error in several lines:

error compiling cython file:

... features[f_i], features[f_j] = features[f_j], features[f_i]

# draw random threshold current.threshold = rand_uniform(min_feature_value, max_feature_value, random_state)

^

_splitter.pyx:1547:65: converting python object not allowed without gil

try upgrading cython installation. old versions (< 0.18) not support const keyword.

see how use const

answer: since cython 0.18, can use in code , in declarations.

earlier versions of cython did not support const directly , required following hack compile c source code:


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