update readme

Author: lyu

CMakeLists.txt

@@ -44,7 +44,7 @@
 |Model   |Description       |mAP   |NDS    |Infer time|
 |---     |---               |---   |---    |---       |
 |Pytorch |                  |0.3972|0.5074|96.052|
-|Pytorch |LSS accelerate$^1$   |0.3787|0.4941|86.236|
+|Pytorch |LSS accelerate^1^   |0.3787|0.4941|86.236|
 |Trt FP32|Python Preprocess$^2$|0.3776|0.4936|25.534|
 |Trt FP32|Bicubic sampler$^3$  |0.3723|0.3895|33.960|
 |Trt FP32|Nearest sampler$^4$  |0.3703|0.4884|25.534|