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@@ -65,7 +65,7 @@ We generate views by perturbing examples with a viewmaker network $V$ , trained
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  Figure $\bigstar$ summarizes our method. The encoder and viewmaker are optimized in alternating steps to minimize and maximize $\mathcal { L }$ , respectively. We use an image-to-image neural network as our viewmaker network, with an architecture adapted from work on style transfer $\left( \mathrm { J o h n s o n e t a l . } \right) \left[ \mathrm { 2 0 1 6 } \right)$ See the Appendix for more details. This network ingests the input image and outputs a perturbation that is constrained to an $\ell _ { 1 }$ sphere. The sphere’s radius is determined by the volume of the input tensor times a hyperparameter $\epsilon$ , the distortion budget, which determines the strength of the applied perturbation. This perturbation is added to the input image and optionally clamped in the case of images to ensure all pixels are in $[ 0 , 1 ]$ . Algorithm 1 describes this process precisely.
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- Input: Viewmaker network $V$ , $C \times W \times H$ image X, $\ell _ { 1 }$ distortion budget ✏, noise
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  Output: Perturbed $C \times W \times H$ image $X$
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  $P V ( X , \delta ) \ / ,$ / generate perturbation
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  $\begin{array} { r } { P \gets \frac { \epsilon C W H } { | P | _ { 1 } } P \gets | / \langle } \end{array}$ project to $\ell _ { 1 }$ sphere
 
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  Figure $\bigstar$ summarizes our method. The encoder and viewmaker are optimized in alternating steps to minimize and maximize $\mathcal { L }$ , respectively. We use an image-to-image neural network as our viewmaker network, with an architecture adapted from work on style transfer $\left( \mathrm { J o h n s o n e t a l . } \right) \left[ \mathrm { 2 0 1 6 } \right)$ See the Appendix for more details. This network ingests the input image and outputs a perturbation that is constrained to an $\ell _ { 1 }$ sphere. The sphere’s radius is determined by the volume of the input tensor times a hyperparameter $\epsilon$ , the distortion budget, which determines the strength of the applied perturbation. This perturbation is added to the input image and optionally clamped in the case of images to ensure all pixels are in $[ 0 , 1 ]$ . Algorithm 1 describes this process precisely.
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+ Input: Viewmaker network $V$ , $C \times W \times H$ image X, $\ell _ { 1 }$ distortion budget ✏, noise
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  Output: Perturbed $C \times W \times H$ image $X$
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  $P V ( X , \delta ) \ / ,$ / generate perturbation
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  $\begin{array} { r } { P \gets \frac { \epsilon C W H } { | P | _ { 1 } } P \gets | / \langle } \end{array}$ project to $\ell _ { 1 }$ sphere