Update index.html

index.html

@@ -154,7 +154,17 @@ gradient norm and then apply soft removal on them to mitigate the potential jail
   \end{aligned}
     $$
   </span>
-  <span id="Gradient-Estimation" class="formula" style="display: none;">$$\displaystyle g_\theta(x)=\sum_{i=1}^P \frac{f_\theta(x\oplus \mu u_i)-f_\theta(x)}{\mu} u_i $$</span>
+  <span id="Gradient-Estimation" class="formula" style="display: none;">
+    $$
+    \displaystyle 
+    \begin{aligned}
+    x^\prime_i=\begin{cases}
+        \beta \times \mathtt{embed}(q_i), \text{~if~$q_i$ in~$\mathcal{Q}$}\\
+        \mathtt{embed}(q_i), \text{~otherwise}
+    \end{cases}
+    \end{aligned}
+    $$
+  </span>
 </div>
 </div>