diff --git a/HeartbeatClassification/Task1 赛题理解.md b/HeartbeatClassification/Task1 赛题理解.md
index 8380fcd..242b106 100644
--- a/HeartbeatClassification/Task1 赛题理解.md	
+++ b/HeartbeatClassification/Task1 赛题理解.md	
@@ -57,7 +57,6 @@ testA.csv
 $$
 {abs-sum={\mathop{ \sum }\limits_{{j=1}}^{{n}}{{\mathop{ \sum }\limits_{{i=1}}^{{4}}{{ \left| {y\mathop{{}}\nolimits_{{i}}-a\mathop{{}}\nolimits_{{i}}} \right| }}}}}}
 $$
-![](http://latex.codecogs.com/gif.latex?\abs-sum={\mathop{ \sum }\limits_{{j=1}}^{{n}}{{\mathop{ \sum }\limits_{{i=1}}^{{4}}{{ \left| {y\mathop{{}}\nolimits_{{i}}-a\mathop{{}}\nolimits_{{i}}} \right| }}}}})
 例如，某心跳信号类别为1，通过编码转成[0,1,0,0]，预测不同心跳信号概率为[0.1,0.7,0.1,0.1]，那么这个信号预测结果的abs-sum为
 $$
 {abs-sum={ \left| {0.1-0} \right| }+{ \left| {0.7-1} \right| }+{ \left| {0.1-0} \right| }+{ \left| {0.1-0} \right| }=0.6}