How many computing sticks can we use

As we plan to do some intensive tasks on the Stretch, could we plug multiple computing sticks on it? (Ex. 4)

Yes @lihongyu0807, it is possible to plug multiple Movidius neural compute sticks (NCS) into Stretch’s trunk hub to parallelize inference on image/video data. The NCS team has made a tutorial on the subject, demonstrating how to use their API to speed up inference. I would recommend trying out their “app zoo”, called ncappzoo, to run sample code and understand how using multiple sticks would work. In particular, the classifier_grip app is a good demonstration on using multiple sticks.