undefined references to `DisplayScreen::display_screen(MediaSource const&)

[onlytailei]

When I use

CMakeFiles/dqn.dir/dqn_main.cpp.o: In function `PlayOneEpisode(ALEInterface&, dqn::DQN&, double, bool)':
dqn_main.cpp:(.text+0xd14): undefined reference to `DisplayScreen::display_screen(MediaSource const&)'
dqn_main.cpp:(.text+0x1124): undefined reference to `DisplayScreen::display_screen(MediaSource const&)'
CMakeFiles/dqn.dir/dqn_main.cpp.o: In function `PlayOneEpisode(ALEInterface&, dqn::DQN&, double, bool) [clone .constprop.106]':
dqn_main.cpp:(.text+0x2414): undefined reference to `DisplayScreen::display_screen(MediaSource const&)'
dqn_main.cpp:(.text+0x283c): undefined reference to `DisplayScreen::display_screen(MediaSource const&)'
CMakeFiles/dqn.dir/dqn_main.cpp.o: In function `main':
dqn_main.cpp:(.text.startup+0xc20): undefined reference to `DisplayScreen::display_screen(MediaSource const&)'
CMakeFiles/dqn.dir/dqn_main.cpp.o:dqn_main.cpp:(.text.startup+0x10a8): more undefined references to `DisplayScreen::display_screen(MediaSource const&)' follow
collect2: error: ld returned 1 exit status
make[2]: *** [dqn] Error 1
make[1]: *** [CMakeFiles/dqn.dir/all] Error 2
make: *** [all] Error 2

[mgbellemare]

It looks like __USE_SDL is defined, but you aren't linking/compiling display_screen.cpp. Did you compile the ALE using cmake -DUSE_SDL=ON ?

[onlytailei]

Thank you very much.
After that, when I use ALE from command line, I always suffer the unsupport roms problem
By the way, could you kindly tell me where can I get the instructions to set the stell?

[mgbellemare]

Can you clarify what you mean by "setting the stell"?

You need to make sure that the filename of the rom you are using matches one of the supported games in src/games/supported.

[onlytailei]

When I use DQN to simulate ALE environment. It said if cannot find the stellarc. It seemed that this is another simulation tool? Where Can I got it?
https://github.com/muupan/dqn-in-the-caffe