成功编译之后，基本上所有问题都可能是文件路径引起的。

官方github文档中没有说清楚，他只说了改model的路径和Vocabulary的路径。

DS_SLAM_TUM.launch中的所有文件的路径都要改成绝对路径，从根目录写起，像这样

<launch>  

	<!-- orb slam  -->
	<node pkg="ORB_SLAM2_PointMap_SegNetM" name="TUM" type="TUM" args="
	/home/cs/catkin_ws/src/DS-SLAM/Examples/ROS/ORB_SLAM2_PointMap_SegNetM/Vocabulary/ORBvoc.bin 
	$(find ORB_SLAM2_PointMap_SegNetM)/TUM3.yaml /home/cs/CS/dataset/rgbd_dataset_freiburg3_walking_xyz 
	/home/cs/CS/dataset/rgbd_dataset_freiburg3_walking_xyz/associate.txt /home/cs/catkin_ws/src/DS-SLAM/Examples/ROS/ORB_SLAM2_PointMap_SegNetM/prototxts/segnet_pascal.prototxt 
	/home/cs/catkin_ws/src/DS-SLAM/Examples/ROS/ORB_SLAM2_PointMap_SegNetM/models/segnet_pascal.caffemodel /home/cs/catkin_ws/src/DS-SLAM/Examples/ROS/ORB_SLAM2_PointMap_SegNetM/tools/pascal.png" output="screen" />

	<!-- Run other launch file -->
    <include file="$(find ORB_SLAM2_PointMap_SegNetM)/launch/Octomap.launch" />
	<include file="$(find ORB_SLAM2_PointMap_SegNetM)/launch/transform.launch" />
	<node pkg="rviz" name="rviz" type="rviz" /> 
	
</launch>