In demo_realsense.m,the problem "module 'nn' not found" occurs. How should I solve this problem? Thanks a lot!

[fuxiao567]

module 'nn' not found:
no field package.preload['nn']
no file './nn.lua'
no file '/usr/share/luajit-2.1.0-beta3/nn.lua'
no file '/usr/local/share/lua/5.1/nn.lua'
no file '/usr/local/share/lua/5.1/nn/init.lua'
no file '/usr/share/lua/5.1/nn.lua'
no file '/usr/share/lua/5.1/nn/init.lua'
no file './nn.so'
no file '/usr/local/lib/lua/5.1/nn.so'
no file '/usr/lib/x86_64-linux-gnu/lua/5.1/nn.so'
no file '/usr/local/lib/lua/5.1/loadall.so'

[chenjiale5]

hello, have you fix this problem?