code: def start(self):
          
          try:
              self._depth_align = False
              if self._registration_mode == RealSenseRegistrationMode.DEPTH_TO_COLOR:
                  self._depth_align = True
  
              self._config_pipe()
              self._profile = self._pipe.start(self._cfg)
  
              # store intrinsics and depth scale
              self._set_depth_scale()
              self._set_intrinsics()
  
              # skip few frames to give auto-exposure a chance to settle
              for _ in range(5):
                  self._pipe.wait_for_frames()
  
              self._running = True
          except RuntimeError as e:
              print(e)
docs: Start the sensor.