allow modules to run code after parameters initialization
allow modules to run code after parameters initialization

cservan/OpenNMT_scores_0.2.0,jsenellart-systran/OpenNMT,jungikim/OpenNMT,OpenNMT/OpenNMT,srush/OpenNMT,jsenellart-systran/OpenNMT,OpenNMT/OpenNMT,da03/OpenNMT,da03/OpenNMT,jsenellart/OpenNMT,da03/OpenNMT,jungikim/OpenNMT,OpenNMT/OpenNMT,jsenellart/OpenNMT,jsenellart/OpenNMT,monsieurzhang/OpenNMT,jungikim/OpenNMT,jsenellart-systran/OpenNMT,monsieurzhang/OpenNMT,monsieurzhang/OpenNMT