Quantize（）将数据转换为二进制格式
您必须加载文件的前缀量化 当您想加载时，“量化：//”前缀告诉catboost期望二进制数据
# Load from Drive
pool2 = cb.Pool(f"quantized://path_to_dir/{'cbpool'}")
# You can verify the loaded pool
print("Number of features:", pool2.num_col())
print("Number of samples:", pool2.num_row())