<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _stop(self):
 """ Stop the GNS3 VM """

        engine = self.current_engine()
        if "vm" in self._controller.computes:
            yield from self._controller.delete_compute("vm")
        if engine.running:
            log.info("Stop the GNS3 VM")
            yield from engine.stop()