sort execution order by PRIORITY

execution.py

@@ -367,6 +367,11 @@ class PromptExecutor:
             while len(to_execute) > 0:
                 #always execute the output that depends on the least amount of unexecuted nodes first
                 to_execute = sorted(list(map(lambda a: (len(recursive_will_execute(prompt, self.outputs, a[-1])), a[-1]), to_execute)))
+                #except that we execute nodes with higher PRIOIRTY first
+                def priority(prompt, item):
+                    class_ = nodes.NODE_CLASS_MAPPINGS[prompt[item]['class_type']]
+                    return class_.PRIORITY if hasattr(class_, 'PRIORITY') else 0
+                to_execute = sorted( to_execute, key = lambda a : priority(prompt, a[-1]), reverse=True )
                 output_node_id = to_execute.pop(0)[-1]
 
                 # This call shouldn't raise anything if there's an error deep in