• Install tensorflow (see https://www.tensorflow.org/versions/r0.9/get_started/os_setup.html)
• Install ROS (see http://wiki.ros.org)
• Install cv-bridge, and camera driver (for example, cv_camera)

$ sudo apt-get install ros-indigo-cv-bridge ros-indigo-cv-camera

• publish: /result (std_msgs/String)
• subscribe: /image (sensor_msgs/Image)

How to try

$ roslaunch rostensorflow rostensorflow.launch
open other terminal ,and run 
$ rostopic echo /result