invalid parent class name nn.Decorator

[Iacopo Poli]

Hi, I'm getting this error when requiring dpnn:

/home/lighton/torch/install/share/lua/5.1/trepl/init.lua:389: 

/home/lighton/torch/install/share/lua/5.1/trepl/init.lua:389: 

/home/lighton/torch/install/share/lua/5.1/torch/init.lua:102: 

bad argument #2 (invalid parent class name nn.Decorator)
stack traceback:
	[C]: in function 'error'
	/home/lighton/torch/install/share/lua/5.1/trepl/init.lua:389: in function 'require'
	[string "_RESULT={require 'dpnn'}"]:1: in main chunk
	[C]: in function 'xpcall'
	/home/lighton/torch/install/share/lua/5.1/trepl/init.lua:661: in function 'repl'
	...hton/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:204: in main chunk
	[C]: at 0x00405d50

I tried

luarocks remove dpnn
luarocks install dpnn

But I still get it. May be related to this?

[Pranas Kiziela]

Yeah, we are seeing the same problem. It must be related to #90 since our builds started failing just after it was merged. It seems nn update should solve the problem, looking into it.

[Iacopo Poli]

Problem still present if installing torch following instructions at torch.ch and then installing dpnn. Solved by doing after that:

luarocks install torch
luarocks install nn
luarocks install dpnn

[Pranas Kiziela]

Our solution was to force install previous version of dpnn like so:

git clone https://github.com/Element-Research/dpnn.git && \
  cd dpnn && \
  git reset --hard ca0e99fa6d0dfd971f0f284520562765ae0865fd && \
  luarocks make rocks/dpnn-scm-1.rockspec

I think we will stick with this until official Torch install starts using newer version of nn.

[Hongfei Xu]

require "nn.Decorator" before require "dpnn" then it can work, but I do not know where is wrong.