cuda 11 compilation error

[Solonets]

It looks like methods that Cuda functions that are used in the projects are deprecated in Cuda 11.

    src/math_functions.cu(76): error: identifier "cusparseScsrmv" is undefined                              
                       
    src/math_functions.cu(87): error: identifier "cusparseDcsrmv" is undefined
                                                                                                            
    src/math_functions.cu(99): error: identifier "cusparseScsrmm2" is undefined
                                            
    src/math_functions.cu(111): error: identifier "cusparseDcsrmm2" is undefined                            
                     
    4 errors detected in the compilation of "src/math_functions.cu".

That prevents it to compile.

[Solonets]

I would propose to add cuda < 11 to requirements as for now.

[chrischoy]

Ah, thanks for the issue. I'll try to fix this in the next version.