AttributeError: 'FigureCanvasMac' object has no attribute 'renderer'

[brunoaibanez]

I am trying to use it in Mac Catalina 10.15.7. I followed the steps to execute demo.py, after installing FF by the Mac link provided.

I did the make, and exported Environment variable to FF/ff path. However, when executing demo.py it shows the following error:

  File "hellopddlgym.py", line 6, in <module>
    img = env.render()
  File "/Users/bruno/Documents/pddlgym/pddlgym/core.py", line 446, in render
    return self._render(self._state.literals, *args, **kwargs)
  File "/Users/bruno/Documents/pddlgym/pddlgym/rendering/sokoban.py", line 167, in render
    return render_from_layout(layout, get_token_images)
  File "/Users/bruno/Documents/pddlgym/pddlgym/rendering/utils.py", line 64, in render_from_layout
    im = fig2data(fig, dpi=dpi)
  File "/Users/bruno/Documents/pddlgym/pddlgym/rendering/utils.py", line 19, in fig2data
    data = np.fromstring(fig.canvas.tostring_argb(), dtype=np.uint8, sep='')
  File "/Users/bruno/Library/Python/3.7/lib/python/site-packages/matplotlib/backends/backend_agg.py", line 440, in tostring_argb
    return self.renderer.tostring_argb()
AttributeError: 'FigureCanvasMac' object has no attribute 'renderer'

[tomsilver]

Hi, thanks for checking out pddlgym and for filing the issue! It looks like this issue may be related to matplotlib's backend. Would you mind trying adding this line to the very top of your script (make sure it's the first thing) and see if that resolves the issue?

import matplotlib; matplotlib.use('agg')

[brunoaibanez]

Hello Tom, Thanks for replying that quickly. I can now execute the file, but there is no plot at all shown or any other output of the program. Is that okay? Thanks, Bruno

…

On Fri, Dec 18, 2020 at 6:52 PM Tom Silver ***@***.***> wrote: Hi, thanks for checking out pddlgym and for filing the issue! It looks like this issue may be related to matplotlib's backend. Would you mind trying adding this line to the very top of your script (make sure it's the first thing) and see if that resolves the issue? import matplotlib; matplotlib.use('agg') — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#47 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGK55NCVGZEG3NOY422NBATSVOJFNANCNFSM4VBO4GZA> .

[tomsilver]

Hi Bruno, glad to hear that resolved the error! Yes, that sounds like expected behavior. If you'd like to see the images that are produced, you could try out the "hello world" example from the README:

import pddlgym
import imageio

env = pddlgym.make("PDDLEnvSokoban-v0")
obs, debug_info = env.reset()
img = env.render()
imageio.imsave("frame1.png", img)
action = env.action_space.sample(obs)
obs, reward, done, debug_info = env.step(action)
img = env.render()
imageio.imsave("frame2.png", img)

That example should save two images in your current directory (frame1.png and frame2.png).

Thanks again for raising the issue. We'll update the README with a note on matplotlib. Feel free to reopen if anything else arises.