madgraph-lhapdf python인터페이스 문제

[jhgoh]

아래와 같은 메시지가 출력되면서 lhapdf 에서 reweighting이 실패함. generation자체에는 문제가 없음.

Failed to access python version of LHAPDF: If the python interface to LHAPDF is available on your system, try adding its location to the PYTHONPATH environment variable and theLHAPDF library location to LD_LIBRARY_PATH (linux) or DYLD_LIBRARY_PATH (mac os x).The required LD_LIBRARY_PATH is /sw/MG5_aMC_v2_9_9/HEPTools/lhapdf6_py3//lib
WARNING: Failed to access python version of LHAPDF: cannot compute PDF uncertainty from the weights in the events. The weights in the LHE event files will still cover all PDF set members, but there will be no PDF uncertainty printed in the run summary. 
 If the python interface to LHAPDF is available on your system, try adding its location to the PYTHONPATH environment variable and theLHAPDF library location to LD_LIBRARY_PATH (linux) or DYLD_LIBRARY_PATH (mac os x). 

[jhgoh]

이와 같이 lhapdf를 제대로 로딩하지 못하는 경우 alpha_s 값을 제대로 적용하지 못하는 등 문제가 있었음. (gridpack를 이용한 study중 알게 됨)
#36 에 따라 gridpack을 사용하여 검증된 환경을 사용하는 편이 바람직해 보임.