minor change

description1.md

@@ -7,10 +7,10 @@ From our findings, we need approximately 1/3 memory under ideal conditions (F, B
 Check out our paper at [Arxiv](https://arxiv.org/abs/2405.15362).
 
 
-| Comparison assuming T_F=T_B=T_W                       | 1F1B  | V-Min  | V-Half     | V-ZB |
-| ----------------------------------------------------- |-------|------- | ---------- | ---- |
-| Bubble Rate                                           | ~ p/m |  ~ 2p/3m     |  ~ p/ 2m    |   0  |
-| Activation Memory <br> (Compared to 1F1B)             |   p   |  (p+4)/3 | (p+2)/2 |   p  |
+| Method                                   | 1F1B  | V-Min    | V-Half   | V-ZB |
+|------------------------------------------|-------|----------|----------| ---- |
+| Bubble Rate <br> (assuming T_F=T_B=T_W)  | ~ p/m | ~ 2p/3m  | ~ p/ 2m  |   0  |
+| Activation Memory <br> (by #micro-batch) |   p   | (p+4)//3 | (p+2)//2 |   p  |
 
 
-Bubble Rate here is calculated as `1 - (F+B+W)*m / longest_stage_time`.
+Bubble Rate here is calculated as `1 - (F+B+W)*m / longest_stage_time`.