python - build sklearn error cythonize failed - 


 $ sudo python setup.py build

gives me following:

partial import of sklearn during build process. generating cython files cythonizing sources sklearn processing sklearn/_isotonic.pyx traceback (most recent call last):   file "/home/scikit-learn/build_tools/cythonize.py", line 198, in <module>     main(root_dir_arg)   file "/home/ascikit-learn/build_tools/cythonize.py", line 190, in main     check_and_cythonize(root_dir)   file "/home/scikit-learn/build_tools/cythonize.py", line 182, in check_and_cythonize     cythonize_if_unchanged(cur_dir, cython_file, gen_file, hashes)   file "/home/scikit-learn/build_tools/cythonize.py", line 156, in cythonize_if_unchanged     cythonize(full_cython_path, full_gen_file_path)   file "/home/scikit-learn/build_tools/cythonize.py", line 61, in cythonize     raise exception('building scikit-learn requires cython >= 0.21') exception: building scikit-learn requires cython >= 0.21 traceback (most recent call last):   file "setup.py", line 297, in <module>     setup_package()   file "setup.py", line 280, in setup_package     generate_cython()   file "setup.py", line 185, in generate_cython     raise runtimeerror("running cythonize failed!") runtimeerror: running cythonize failed!

while cython installed:

processing ./cython-0.24-cp27-cp27mu-manylinux1_x86_64.whl installing collected packages: cython   found existing installation: cython 0.24     uninstalling cython-0.24:       uninstalled cython-0.24 installed cython-0.24


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