Python binding installation is giving warning.

[theshoonyam]

What am I trying to accomplish?

I was trying to get the python binding of mlpack by following the instructions given in README.MD .

What is the output?

On running make -j8 , I got the following output on command line.
I am pasting the small range of output(where the warning is) since there is character limit.

home/aditya/Desktop/mlpack/src/mlpack/bindings/python/print_wrapper_py.cpp: In function ‘void mlpack::bindings::python::PrintWrapperPY(const string&, const string&, const string&)’: /home/aditya/Desktop/mlpack/src/mlpack/bindings/python/print_wrapper_py.cpp:67:17: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<std::__cxx11::basic_string<char>, std::allocator<std::__cxx11::basic_string<char> > >::size_type’ {aka ‘long unsigned int’} [-Wsign-compare] 67 | for(int i=0; i<methods.size(); i++) | ~^~~~~~~~~~~~~~~ [ 88%] Linking CXX executable ../../../bin/generate_pyx_krann [ 88%] Built target generate_pyx_krann [ 88%] Building Cython binding decision_tree.so... /usr/lib/python3/dist-packages/pkg_resources/__init__.py:116: PkgResourcesDeprecationWarning: 0.1.43ubuntu1 is an invalid version and will not be supported in a future release warnings.warn( /usr/lib/python3/dist-packages/pkg_resources/__init__.py:116: PkgResourcesDeprecationWarning: 1.1build1 is an invalid version and will not be supported in a future release warnings.warn( /usr/lib/python3/dist-packages/setuptools/installer.py:27: SetuptoolsDeprecationWarning: setuptools.installer is deprecated. Requirements should be satisfied by a PEP 517 installer. warnings.warn( running build_ext cythoning mlpack/decision_tree.pyx to mlpack/decision_tree.cpp [ 88%] Linking CXX executable ../../../bin/generate_pyx_linear_regression_predict [ 88%] Built target generate_pyx_linear_regression_predict [ 88%] Building Cython binding det.so... /home/aditya/.local/lib/python3.10/site-packages/Cython/Compiler/Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: /home/aditya/Desktop/mlpack/build/src/mlpack/bindings/python/mlpack/decision_tree.pyx tree = Parsing.p_module(s, pxd, full_module_name)

Steps to reproduce:

• Ubuntu - 22.04
• Python-3.10.6
• Follow the instructions given in README.MD to install python bindings.

This issue is already reported in the following link:
Issue 1
Issue 2

[theshoonyam]

Please look into the matter as I am getting more warnings. I have followed the manual steps as described in mlpack README.
These are the steps that I followed:

• git clone the repository in local terminal
• install all the dependent packages.
• made a build folder inside source directory
• cmake -DBUILD_PYTHON_BINDINGS=ON ../
• sudo make -j12
• sudo make install

With few warnings, It shows that it has completely installed the python bindings.
But when I run import mlpack inside any .py file, it gives ModuleNotFoundError.

[AdarshSantoria]

Once I also had this particular problem, then I run the python script in build/src/mlpack/bindings/python which then worked for me. Please try it out, it may help you too.

[rcurtin]

Did you set PYTHONPATH correctly? Manually building the Python bindings often requires some amount of debugging along those lines. (This is why they are packaged in pip and conda.)

[theshoonyam]

Yeah, Now it is working fine. Thanks @rcurtin and @AdarshSantoria!