<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_running(self):
 """ If a node is started or paused return True """

        for node in self._nodes.values():
            # Some node type are always running we ignore them
            if node.status != "stopped" and not node.is_always_running():
                return True
        return False