Annoying Warning: to-Python converter already registered [sf#1] about pagmo

[darioizzo]

Originally posted by darioizzo on 2012-08-27 13:11:37.

This has to do with a strange behaviour that in some system is showed by the boost::python query register. The following code:

boost::python::type_info info = boost::python::type_id();
const boost::python::converter::registration* reg = boost::python::converter::registry::query(info);

fails if one tries to register both std::vector and std::vectorstd::vector in the same boost::python module

[darioizzo]

Originally posted by darioizzo on 2012-08-29 18:12:17.

• status: open --> accepted
• assigned_to: Dario Izzo

[darioizzo]

Originally posted by darioizzo on 2012-10-22 17:23:53.

• status: accepted --> closed

[darioizzo]

Originally posted by darioizzo on 2012-10-22 17:23:53.

I think this is a bug in boost python. In some operating systems the default constructor is called for an object registration even when the relative type conversion has not been registered. This makes the call to query return the wrong result. As a workaround, I propose to check, in case an already registered converter is found, that the found registartion makes sense having a non NULL pointer to a to-python converter (NULL is assigned by the default constructor of the registration object).

The code below has been produced and commited in core.cpp to fix the problem

#define REGISTER_CONVERTER(T,policy) \
{\
   boost::python::type_info info = boost::python::type_id<T >(); \
   const boost::python::converter::registration* reg = boost::python::converter::registry::query(info); \
   if (reg == NULL)  \
   {\
    to_tuple_mapping<T >();\
    from_python_sequence<T,policy>();\
   }\
   else if ((*reg).m_to_python == NULL)\
   {\
    to_tuple_mapping<T >();\
    from_python_sequence<T,policy>();\
   }\
}

[AmandaYingYiWu24]

I open IPython to test that PyCaffe is working. I input "ipython" command, and enter into the ipython page. Then, I input  the command "import caffe", but I got below warnings:

/root/code/caffe-master/python/caffe/pycaffe.py:13: RuntimeWarning: to-Python converter for boost::shared_ptrcaffe::Net already registered; second conversion method ignored.
from ._caffe import Net, SGDSolver, NesterovSolver, AdaGradSolver, \

/root/code/caffe-master/python/caffe/pycaffe.py:13: RuntimeWarning: to-Python converter for boost::shared_ptrcaffe::Blob already registered; second conversion method ignored.
from ._caffe import Net, SGDSolver, NesterovSolver, AdaGradSolver, \

/root/code/caffe-master/python/caffe/pycaffe.py:13: RuntimeWarning: to-Python converter for boost::shared_ptrcaffe::Solver already registered; second conversion method ignored.
from ._caffe import Net, SGDSolver, NesterovSolver, AdaGradSolver, \

Would you pls help to give me some suggestions to resolve it?

[darioizzo]

This is not an issue with pagmo, maybe you may want to bring it to the attention of the pycaffe developers.