MAINT Remove stale import of internals.
MAINT Remove stale import of internals.

dursk/pyfolio,dursk/pyfolio,ChinaQuants/pyfolio,yanheven/pyfolio,r0k3/pyfolio,ChinaQuants/pyfolio,chayapan/pyfolio,femtotrader/pyfolio,quantopian/pyfolio,sketchytechky/pyfolio,sketchytechky/pyfolio,r0k3/pyfolio,YihaoLu/pyfolio,raybuhr/pyfolio,yanheven/pyfolio,femtotrader/pyfolio,YihaoLu/pyfolio,quantopian/pyfolio,raybuhr/pyfolio