move data to GPU in parallel
move data to GPU in parallel

huanzhang12/LightGBM,huanzhang12/lightgbm-gpu,huanzhang12/LightGBM,huanzhang12/lightgbm-gpu,huanzhang12/lightgbm-gpu,huanzhang12/LightGBM,huanzhang12/LightGBM,huanzhang12/lightgbm-gpu,huanzhang12/lightgbm-gpu,huanzhang12/LightGBM