remove unecessary precondition check
remove unecessary precondition check

hhexiy/vowpal_wabbit,hhexiy/vowpal_wabbit,hhexiy/vowpal_wabbit,hhexiy/vowpal_wabbit,hhexiy/vowpal_wabbit,hhexiy/vowpal_wabbit,hhexiy/vowpal_wabbit,hhexiy/vowpal_wabbit,hhexiy/vowpal_wabbit,hhexiy/vowpal_wabbit