--- a
+++ b/Demo/Preprocess_Data.m
@@ -0,0 +1,16 @@
+function [data,label,task_index,ins_num]=PreprocessMTData(data,label)
+    m=length(data);
+    newdata=[];
+    newlabel=[];
+    task_index=[];
+    ins_num=zeros(1,m);
+    for i=1:m
+        newdata=[newdata;data{i}];
+        newlabel=[newlabel,label{i}];
+        task_index=[task_index,i*ones(1,size(data{i},1))];
+        ins_num(i)=size(data{i},1);
+    end
+    clear data label;
+    data=newdata;
+    label=newlabel;
+    clear newdata newlabel;
\ No newline at end of file