refine callback (#223)
refine callback (#223)


microsoft/LightGBM,olofer/LightGBM,olofer/LightGBM,huanzhang12/lightgbm-gpu,Allardvm/LightGBM,microsoft/LightGBM,sightmachine/LightGBM,henry0312/LightGBM,Laurae2/LightGBM,olofer/LightGBM,henry0312/LightGBM,huanzhang12/LightGBM,huanzhang12/lightgbm-gpu,Laurae2/LightGBM,henry0312/LightGBM,cbecker/LightGBM,cbecker/LightGBM,cbecker/LightGBM,olofer/LightGBM,Allardvm/LightGBM,huanzhang12/LightGBM,huanzhang12/lightgbm-gpu,fstonezst/LightGBM,wxchan/LightGBM,fstonezst/LightGBM,fstonezst/LightGBM,huanzhang12/LightGBM,cbecker/LightGBM,huanzhang12/lightgbm-gpu,wxchan/LightGBM,fstonezst/LightGBM,wxchan/LightGBM,Allardvm/LightGBM,fstonezst/LightGBM,huanzhang12/LightGBM,Allardvm/LightGBM,henry0312/LightGBM,Laurae2/LightGBM,Allardvm/LightGBM,wxchan/LightGBM,sightmachine/LightGBM,Laurae2/LightGBM,microsoft/LightGBM,microsoft/LightGBM,sightmachine/LightGBM,olofer/LightGBM,microsoft/LightGBM,henry0312/LightGBM,wxchan/LightGBM,sightmachine/LightGBM,huanzhang12/lightgbm-gpu,huanzhang12/LightGBM,Laurae2/LightGBM