Algorithm 1: Simplified single-pass copy.

Input: $f_{\mathcal{O}}$, $f_{\mathcal{C}}\left(\theta \right)$     Output: ${\theta }^{*}$ 1 Draw N samples: $${\mathbf{Z}}^{*}={\left\{{\mathbf{z}}_j\right\}}_{j=1}^N,{\mathbf{z}}_j\sim P_Z$$ 2 Label ${\mathbf{Z}}^{*}$: $$\mathcal{Z}={\left\{({\mathbf{z}}_j,f_{\mathcal{O}}\left({\mathbf{z}}_j\right))\right\}}_{j=1}^N$$ 3 with $(z_i,y_i)\in \mathcal{Z}$: $${\theta }^{*}=arg\underset{\theta }{min}\frac{1}{N}\sum _{j=1}^N{\gamma }_1{\ell }_1(f_{\mathcal{C}}({\mathbf{z}}_j,\theta ),y_j)$$