Cleaned up unused imports in experiment.py
Cleaned up unused imports in experiment.py

jamesrobertlloyd/gp-structure-search,jamesrobertlloyd/gp-structure-search,codeaudit/gp-structure-search,ekamioka/gp-structure-search,codeaudit/gp-structure-search,ekamioka/gp-structure-search,jamesrobertlloyd/gp-structure-search,ekamioka/gp-structure-search,codeaudit/gp-structure-search,ekamioka/gp-structure-search,jamesrobertlloyd/gp-structure-search,jamesrobertlloyd/gp-structure-search,ekamioka/gp-structure-search,codeaudit/gp-structure-search,codeaudit/gp-structure-search