how to create an network in network?

Hi, I need to create an inception module, which is an NIN structure.

so how to fulfill it in deep leaning toolbox? ( not with Deep Network Designer but with codes)

[Kevin Chng]

Will this help you?

https://www.mathworks.com/help/deeplearning/ref/nnet.cnn.layergraph.html

[Jack Xiao]

Thank you. But i need a more clear demo. I wonder that how is the in-line googlenet or inception v3 created using codes?