Update describe_rr_node.cpp

Author: Wang-Yuanqi-source

libs/librrgraph/src/utils/describe_rr_node.cpp

@@ -37,6 +37,11 @@ std::string describe_rr_node(const RRGraphView& rr_graph,
         msg += vtr::string_fmt(" pin: %d pin_name: %s",
                                rr_graph.node_pin_num(inode),
                                pin_name.c_str());
+    } else if (rr_graph.node_type(inode) == MEDIUM) {
+        auto index = rr_graph.node_ptc_num(inode);
+        
+        msg += vtr::string_fmt(" medium index: %d",
+                               index);
     } else {
         VTR_ASSERT(rr_graph.node_type(inode) == SOURCE || rr_graph.node_type(inode) == SINK);
 
@@ -50,4 +55,4 @@ std::string describe_rr_node(const RRGraphView& rr_graph,
     msg += " " + rr_graph.node_coordinate_to_string(inode);
 
     return msg;
-}
+}