如何使用Julia画AUC曲线

AUC(area under the curve)是一个用于模型评估的工具，也就是ROC曲线下的面积大小。

安装方法：

] add https://github.com/diegozea/ROC.jl

using AUC

LoadError: ArgumentError: Package AUC not found in current path.
- Run `import Pkg; Pkg.add("AUC")` to install the AUC package.

function noisy(label; λ=0.0)
           if label
               return 1 - λ*rand()
           else
               return λ*rand()
           end
       end

noisy (generic function with 1 method)

labels = rand(Bool, 200);

scores(λ) = map(labels) do label
           noisy(label, λ=λ)
       end

scores (generic function with 1 method)

roc_good = roc(scores(0.6), labels, true);
roc_bad = roc(scores(1.0), labels, true);

LoadError: UndefVarError: roc not defined