remove a warning
remove a warning

microsoft/LightGBM,henry0312/LightGBM,Laurae2/LightGBM,microsoft/LightGBM,henry0312/LightGBM,Laurae2/LightGBM,henry0312/LightGBM,microsoft/LightGBM,henry0312/LightGBM,Allardvm/LightGBM,Allardvm/LightGBM,microsoft/LightGBM,Laurae2/LightGBM,Laurae2/LightGBM,Allardvm/LightGBM,Laurae2/LightGBM,Allardvm/LightGBM,microsoft/LightGBM,Allardvm/LightGBM,henry0312/LightGBM