read_vector_history_from_file function (io module) - pybind failed to convert function return value to Python type

[vieroedo]

Hi all!

As the title says, I encountered this issue when trying to use the function read_vector_history_from_file (io module). Precisely, pycharm returns a TypeError saying the return value of the function (in c++ I assume) is an unregistered type. So basically from what Dominic said it should be an issue of pybind that is unable to convert std::map containers with Eigen types in them. I indeed get the error:
TypeError: Unable to convert function return value to a Python type! The signature was (vector_size: int, file_name: str) -> Dict[float, Eigen::Matrix<double,-1,1,0,-1,1>]

I am not very experienced in opening GitHub issues, so please let me know if I should add something to it or present it differently, thanks!