Error - Segmentation Fault

Question

I am trying to run DQN, which is some AI for Atari.

Upon launching the program (sudo bash run_cpu < the_name_of_the_game >), I get the following error: run_cpu: line 46: 9377 Segmentation fault ../torch/bin/luajit train_agent.lua $args

From Running application ends with "Segmentation Fault", the error seems to be coming from the program, but many other people have used it without any problem ...

How can I solve this?

I'm quite new to Linux, and I'm on Elementary OS (+-latest stable version)

I took the program here : https://sites.google.com/a/deepmind.com/dqn/

Which game are you training DQN on? Could you try without `sudo`? — Stephen Kitt, Mar 04 '15 at 23:10
@StephenKitt I have tried breakout and a 3D tic-tac-toe game. I have tried without sudo, it gives me the same error (just the number changes, it's still around 10000, that should be the process's ID (?)) — Hippalectryon, Mar 04 '15 at 23:14
@HackSaw Do you mean the roms or the DQN ? I have tried several ROMs so they should be ok, and the DQN has been run successfully by other people. — Hippalectryon, Mar 04 '15 at 23:55
I mean the game itself. If the game works outside of the learning framework, this suggests it's not the problem. — Hack Saw, Mar 05 '15 at 00:01

score 1 · Answer 1 · answered Mar 07 '15 at 20:39

1

Is the ROM name capitalized? If so, make it lower case. For example:

    Breakout.bin ==> breakout.bin

Also make sure that you have 6GB of RAM!

answered Mar 07 '15 at 20:39

Rahul

11
1

Why do I need 6 GB or RAM ? (I only have 4) – Hippalectryon Mar 08 '15 at 14:14
Because the network is large and all the training happens in memory. – Rahul Mar 09 '15 at 10:18

Hack Saw · Answer 2 · 2015-03-04T23:55:59.537

0

The instructions are possibly misleading for a newbie. Let's say you have a game called "happy". The command line you type would be:

./run_cpu happy

That is, don't include the < or >.

In any case, you generally don't need to use sudo unless you get a permissions error.

edited Mar 04 '15 at 23:55

answered Mar 04 '15 at 23:48

Hack Saw

1,004
7
14

I didn't include them, I just ran (for example) sudo bash run_cpu breakdown. – Hippalectryon Mar 04 '15 at 23:50
I use sudo because otherwise I get a 'Permission Denied' error. (sorry for being unclear in my question) – Hippalectryon Mar 04 '15 at 23:57
That's odd. At the top level of the Human_Level_Control_through_Deep_Reinforcement_Learning directory, try this command: "sudo chown -R $your_user_name ." This will ensure everything in the directory is owned by you. – Hack Saw Mar 05 '15 at 00:06
My concern is that something else has the wrong permissions, and a program is getting an error message instead of the expected output, which might cause a seg fault. – Hack Saw Mar 05 '15 at 00:10
"sudo chown -R $hippa" gives me a 'chown: missing operand' error – Hippalectryon Mar 05 '15 at 00:14
The '.' at the end isn't punctuation. It's Unix-speak for "the current directory". Unix-speak for "the current directory's parent" is ".." If you run "ls -a" you'll see them. – Hack Saw Mar 05 '15 at 00:17
So: sudo chown -R $hippa . – Hack Saw Mar 05 '15 at 00:18
Let us [continue this discussion in chat](http://chat.stackexchange.com/rooms/21657/discussion-between--and-hack-saw). – Hippalectryon Mar 05 '15 at 00:18

Error - Segmentation Fault

2 Answers2