Links or load problem about qt

[russellfei]

Qt based console offers such a easy to display convolutional kernels
(--> what I realized several days ago 0_0, thanks @culurciello 's video on youtube)

torch configuration

• soumith/torch-distro
• manually installed deps according to torch/ezinstall
• platform: OS X 10.9
• python with pip installed ipython

installation overview:

• build success
• Path manually revised to .bash_profile (equivalent in .bashrc)
• Qt installed with brew

test code

require 'image'
image.display(image.lena())

test output

Success binary tool:

• qlua
• macqlua

Error binary tool:

• th
• itorch ( cmd/notebook/qtconsole)

Error info:

th> require 'image'
true    
                                                                      [0.0054s]
th> image.display(image.lena())
...ltorch/torch-distro/install/share/lua/5.1/trepl/init.lua:319: module 'qt' not found:No LuaRocks module found for qt
    no field package.preload['qt']
    no file '/Users/russellfei/.luarocks/share/lua/5.1/qt.lua'
    no file '/Users/russellfei/.luarocks/share/lua/5.1/qt/init.lua'
    no file '/usr/local/mltorch/torch-distro/install/share/lua/5.1/qt.lua'
    no file '/usr/local/mltorch/torch-distro/install/share/lua/5.1/qt/init.lua'
    no file './qt.lua'
    no file '/usr/local/mltorch/torch-distro/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 '/Users/russellfei/.luarocks/lib/lua/5.1/qt.so'
    no file '/usr/local/mltorch/torch-distro/install/lib/lua/5.1/qt.so'
    no file './qt.so'
    no file '/usr/local/lib/lua/5.1/qt.so'
    no file '/usr/local/lib/lua/5.1/loadall.so'
stack traceback:
    [C]: in function 'error'
    ...ltorch/torch-distro/install/share/lua/5.1/trepl/init.lua:319: in function 'require'
    ...ltorch/torch-distro/install/share/lua/5.1/image/init.lua:945: in function 'display'
    [string "image.display(image.lena())"]:1: in main chunk
    [C]: in function 'xpcall'
    ...ltorch/torch-distro/install/share/lua/5.1/trepl/init.lua:588: in function 'repl'
    ...rch-distro/install/lib/luarocks/rocks/trepl/scm-1/bin/th:185: in main chunk
    [C]: at 0x01094eb610    

Summary

• the success two binary tools show that this issue lies in the preload way of qt, I guess.
• According to previous posts on Google Groups, this issue results from Qt4

Questions

• What about Qt5? brew version has Qt5, or torch is only designed with Qt4?
• brew install qt gives apps like QtDesigner, however, torch just connects to qt for visualization,
  which part of qt source/module does torch use? Can we link that path to th or so to directly use qt?

[culurciello]

;-)

[alexbw]

The above steps, with small differences, works for me using your steps in qlua.
The differences are, I install dependencies before installing torch, and I use torch/distro (this repo) and not soumith/torch-distro. There aren't any changes between them that should affect this, though.

[russellfei]

@alexbw but the soumith/torch-distro is directed to torch/distro (soumith authored that before torch/distro is released, so I kept typing that url to find it ;-)
qlua and macqlua works fine for me.
However, the other tools don't, that's quite strange.

[soumith]

@russellfei Qt interface only works in qlua! this is not at all an issue.
We have nothing in the works for Qt5. Lots of time and effort have to be invested, for something that might not be much of an addition.

[russellfei]

@soumith Well, in culuricello's video, there's some interface like torch qtconsole, but I didn't find identical one.

Question

according to what you said, how iTorch and th using image.display function?
Dependening on gfx.js?

So the image.display is overrided in different binary tools, isn't it?

[russellfei]

Tested.
itorch use itorch.image(image.lena()) to display images.

[psabouri]

@russellfei I have same problem and I am unable to solve it. how did you overcome this problem? did you install another package to run itorch?

[russellfei]

@psabouri sorry for late reply.
If you checked my note above, you should keep in mind that iTorch is based on both torch and ipython (actually penlight package should also be included, but it's installed by default).
You need to have ipython toolset installed first, and torch (Be patient to add your torch path to environment variables -- it is essential to make torch work)

If you still have any questions about torch, just reply here, ;-)

[jiangfeng15]

when I use (require 'qt')，it remind me that module 'qt' not found, but how to install qt, my system is ubuntu 14

[russellfei]

try qlua if you followed scripts on torch/ezinstall (the easiest way to deploy torch ecosystem).
Otherwise, search ask ubuntu for how to install qt 4, there are plenty of helpful web pages.

[eriche2016]

qlua is the solution indeed

[Schrodinger1926]

I got that solution is to use qlua to execute my file but why doesn't qt work with 'th' interpreter ?? How do i display images with th interpreter??

[russellfei]

@Mindboggler
If you want to display images with th, you should use other display utilities such as gfx.go
Or, you can use qlua.
th is just a cmd utility without display function.

[Schrodinger1926]

peace

[vrama91]

@russellfei I have the same problem. I am using I Torch notebook, and trying out image.display(image.lena())
I get an error which says that "module 'qt' not found”. I verified that my itorch was using luajit and not the qt console. Is something wrong with my itorch setup? I am using anaconda python.

[soumith]

@ramakrishnavedantam928 read the itorch documentation. I dont see why you expect image.display to work in itorch?

[svkerr]

@Mindboggler Thanks - but how do i use qlua from within a torch script (filename.lua) that calls:
image.display(some_image)?

[Schrodinger1926]

If you want image.display to work in torch, you simply don't use $th filename.lua. You execute $qlua filename.lua . filename.lua will still be a torch script.

[svkerr]

Thanks @Mindboggler.

[christopher5106]

Thanks @russellfei

[yiran-THU]

Thanks @eriche2016