removed unn

src/GraphLoop/graph_loops_base.cpp

@@ -6,14 +6,12 @@
 #include <cstdint>
 
 #include <map>
-#include <unordered_map>
 #include <vector>
 #include <set>
 #include <string>
 
 using std::vector;
 using std::map;
-using std::unordered_map;
 using std::tuple;
 using std::set;
 using std::string;