fix latex (huggingface#928)

informer.md

@@ -60,7 +60,7 @@ $$
 \textrm{ProbSparseAttention}(Q, K, V) = \textrm{softmax}(\frac{Q_{reduce}K^T}{\sqrt{d_k}} )V
 $$
 
-where the \\(Q_{reduce}\\) matrix only selects the Top  \\(u)\\ "active" queries. Here, \\(u = c \cdot \log L_Q\\) and \\(c\\) called the _sampling factor_ hyperparameter for the ProbSparse attention. Since \\(Q_{reduce}\\) selects only the Top \\(u\\) queries, its size is \\(c\cdot \log L_Q \times d\\), so the multiplication \\(Q_{reduce}K^T\\) takes only \\(O(L_K \log L_Q) = O(T \log T)\\).
+where the \\(Q_{reduce}\\) matrix only selects the Top  \\(u\\) "active" queries. Here, \\(u = c \cdot \log L_Q\\) and \\(c\\) called the _sampling factor_ hyperparameter for the ProbSparse attention. Since \\(Q_{reduce}\\) selects only the Top \\(u\\) queries, its size is \\(c\cdot \log L_Q \times d\\), so the multiplication \\(Q_{reduce}K^T\\) takes only \\(O(L_K \log L_Q) = O(T \log T)\\).
 
 This is good! But how can we select the \\(u\\) "active" queries to create \\(Q_{reduce}\\)? Let's define the _Query Sparsity Measurement_.