ss="sd">    :math:`\\nabla J(\\theta, x, y)`, where :math:`\\theta` represents the model parameters,</span>
<span class="sd">    x is the model input, and y is the label of x, the adversarial sample is generated</span>
<span class="sd">    iteratively as,</span>
<span class="sd">    </span>
<span class="sd">    .. math::</span>
<span class="sd">        \\begin{eqnarray}</span>
<span class="sd">            x^*_0 &amp; = &amp;x,</span>
<span class="sd">            x^*_i &amp; = &amp; clip_{x,e} (x^*_{i