Torch does not see qtlua.

[mszlazak]

On Ubuntu 14.04 32-bit a couple issues come up with

luarocks install qtlua

First is looks for "anaconda1anaconda2anaconda3" which doesn't exist so the build fails. I did a symbolic link to Anaconda from 'anaconda1anaconda2anaconda3" and then the build worked.

However, whenever i do: require 'qtlua', th does not see it but qtlua is in the package table??

[soumith]

for using qtlua, start torch in your terminal with:

$ qlua

instead of

$ th

[mszlazak]

Thx. The issue with work around came up here before:

https://github.com/torch/nngraph/issues/35

[johnmellor]

Is there any way to use qtlua without qlua?

I'm trying to add a file picker button to an iTorch notebook, and the obvious way to do this (since HTML <input type="file"> lets you read a file but doesn't give you the path) would be to use IPython.notebook.kernel.execute to launch a QFileDialog (only works if iTorch kernel is on same machine as client of course), but like th, iTorch's Lua repl fails to e.g. require 'qtgui':

/home/john/torch/install/share/lua/5.1/qtgui/init.lua:2: module 'qt' not found:
    no field package.preload['qt']
    no file './qt.lua'
    no file '/home/john/torch/install/share/luajit-2.1.0-alpha/qt.lua'
    no file '/usr/local/share/lua/5.1/qt.lua'
    no file '/usr/local/share/lua/5.1/qt/init.lua'
    no file '/home/john/torch/install/share/lua/5.1/qt.lua'
    no file '/home/john/torch/install/share/lua/5.1/qt/init.lua'
    no file './qt.so'
    no file '/usr/local/lib/lua/5.1/qt.so'
    no file '/home/john/torch/install/lib/lua/5.1/qt.so'
    no file '/usr/local/lib/lua/5.1/loadall.so'
stack traceback:
    [C]: in function 'require'
    /home/john/torch/install/share/lua/5.1/qtgui/init.lua:2: in main chunk

[soumith]

you cannot use the qt interface without qlua. You can hack the itorch launcher script to launch using qlua (instead of luajit).

https://github.com/facebook/iTorch/blob/master/itorch_launcher#L17

Change lines 17,18 from "luajit" to "qlua"

[johnmellor]

Thanks, that works. Perhaps it should be the default?: https://github.com/facebook/iTorch/pull/47