You get this error message because when receiving the data in the thread, it does not know what are the objects you are sending him. You should require all necessary libraries inside the threads before using them. You can easily do this in the initialization function when creating the thread pool (see doc here).

Thanks for the help.
Could you please tell me how to require a local file in the initialization function?
I got the lua script called util.lua. Require ‘util.lua’ works at the beginning of my main code. But this does not work in the initialization function. I added its path in the front but it still does not work. Here is the error I have.

/Users/chenyu/torch/install/bin/luajit: ...s/chenyu/torch/install/share/lua/5.1/threads/threads.lua:183: [thread 2 callback] parallel-train.lua:454: module '/Desktop/seq2seq-attn/data.lua' not found:
no field package.preload['/Desktop/seq2seq-attn/data.lua']
no file './/Desktop/seq2seq-attn/data/lua.lua'
no file '/Users/chenyu/torch/install/share/luajit-2.1.0-beta1//Desktop/seq2seq-attn/data/lua.lua'
no file '/usr/local/share/lua/5.1//Desktop/seq2seq-attn/data/lua.lua'
no file '/usr/local/share/lua/5.1//Desktop/seq2seq-attn/data/lua/init.lua'
no file '/Users/chenyu/torch/install/share/lua/5.1//Desktop/seq2seq-attn/data/lua.lua'
no file '/Users/chenyu/torch/install/share/lua/5.1//Desktop/seq2seq-attn/data/lua/init.lua'
no file './/Desktop/seq2seq-attn/data/lua.so'
no file '/usr/local/lib/lua/5.1//Desktop/seq2seq-attn/data/lua.so'
no file '/Users/chenyu/torch/install/lib/lua/5.1//Desktop/seq2seq-attn/data/lua.so'
no file '/usr/local/lib/lua/5.1/loadall.so'
no file './/Desktop/seq2seq-attn/data.so'
no file '/usr/local/lib/lua/5.1//Desktop/seq2seq-attn/data.so'
no file '/Users/chenyu/torch/install/lib/lua/5.1//Desktop/seq2seq-attn/data.so'
no file '/usr/local/lib/lua/5.1/loadall.so'
stack traceback:
[C]: in function 'require'
parallel-train.lua:454: in function parallel-train.lua:451
[C]: in function 'xpcall'
...s/chenyu/torch/install/share/lua/5.1/threads/threads.lua:234: in function 'callback'
/Users/chenyu/torch/install/share/lua/5.1/threads/queue.lua:65: in function </Users/chenyu/torch/install/share/lua/5.1/threads/queue.lua:41>
[C]: in function 'pcall'
/Users/chenyu/torch/install/share/lua/5.1/threads/queue.lua:40: in function 'dojob'
[string " local Queue = require 'threads.queue'..."]:13: in main chunk
stack traceback:
[C]: in function 'error'
...s/chenyu/torch/install/share/lua/5.1/threads/threads.lua:183: in function 'dojob'
...s/chenyu/torch/install/share/lua/5.1/threads/threads.lua:264: in function 'synchronize'
...s/chenyu/torch/install/share/lua/5.1/threads/threads.lua:142: in function 'specific'
...s/chenyu/torch/install/share/lua/5.1/threads/threads.lua:125: in function 'Threads'
parallel-train.lua:450: in function 'train_batch'
parallel-train.lua:1132: in function 'train'
parallel-train.lua:1548: in function 'main'
parallel-train.lua:1554: in main chunk
[C]: in function ‘dofile'

Thanks,
Chenyu

On Aug 16, 2016, at 5:49 AM, albanD <notifications@github.commailto:notifications@github.com> wrote:

You get this error message because when receiving the data in the thread, it does not know what are the objects you are sending him. You should require all necessary libraries inside the threads before using them. You can easily do this in the initialization function when creating the thread pool (see doc herehttps://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_torch_threads-23threadsthreadsnf1f2&d=CwMFaQ&c=imBPVzF25OnBgGmVOlcsiEgHoG1i6YHLR0Sj_gZ4adc&r=17sDuGpCLWOErAUEqb2yxA&m=ptaKEGx-VitM-aOOgbASIdLfSvUvaF6zOmzGoj1iowE&s=YPIO1ZJp8uE55nH7qk8pLfIL1OyHffk5Js8hPeGhKkQ&e=).

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HI,

If the script is in the current directory, have you tried require('util') ? I think the .lua is appended automatically
Also when you provide a full path, you should not use ~/ but /home/username/.

That solved the problem perfectly.

Thanks for the help,
Chenyu

On Aug 16, 2016, at 10:52 AM, albanD <notifications@github.commailto:notifications@github.com> wrote:

HI,

If the script is in the current directory, have you tried require('util') ? I think the .lua is appended automatically
Also when you provide a full path, you should not use ~/ but /home/username/.

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