IndexError: index 0 is out of bounds for axis 1 with size 0

[alberaja]

I receive this same error trying launching master with:
swarm fireflies 14 --function michalewicz --alpha 0.5 --beta 0.2 --gamma 1.0
swarm whales 14 -f michalewicz -n 10
swarm wolves 10 -f=michalewicz

(...)
2023-04-16 17:58:14,875 [INFO ] Current best value: -0.9966775719782092, Overall best value: -1.7399912676909937
2023-04-16 17:58:14,877 [INFO ] Current best value: -1.0013626000092621, Overall best value: -1.7399912676909937
Traceback (most recent call last):
File "", line 198, in run_module_as_main
File "", line 88, in run_code
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\Scripts\swarm.exe_main.py", line 7, in
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\swarmlib_main.py", line 86, in run_swarm
algorithm(args)
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\swarmlib\gwo\main.py", line 19, in _run_gwo
problem.replay()
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\swarmlib\util\problem_base.py", line 25, in replay
self._visualizer.replay()
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\swarmlib\util\base_visualizer.py", line 85, in replay
_ = animation.FuncAnimation(self._fig, self._animate, frames=frames, interval=self.__frame_interval,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\matplotlib\animation.py", line 1694, in init
super().init(fig, **kwargs)
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\matplotlib\animation.py", line 1416, in init
super().init(fig, event_source=event_source, *args, **kwargs)
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\matplotlib\animation.py", line 880, in init
self._setup_blit()
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\matplotlib\animation.py", line 1214, in _setup_blit
self._init_draw()
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\matplotlib\animation.py", line 1750, in _init_draw
self._drawn_artists = self._init_func()
^^^^^^^^^^^^^^^^^
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\swarmlib\util\base_visualizer.py", line 94, in _init
self.__particles.set_offsets([[]])
File "C:\Users\Alberto\AppData\Roaming\Python\Python311\site-packages\matplotlib\collections.py", line 551, in set_offsets
(np.asanyarray(self.convert_xunits(offsets[:, 0]), float),
~~~~~~~^^^^^^
IndexError: index 0 is out of bounds for axis 1 with size 0

(...)
AttributeError: 'FuncAnimation' object has no attribute '_resize_id'

[HaaLeo]

Hi @alberaja, thx for your contribution. I've never tested the package with python 3.11. Can you pls try to setup a virtual environment with python 3.9 and install the package there as described in the README.md?

[ivanmilevtues]

Hey, we've encountered similar problem on Python 3.7. We've worked around the problem by editing line 94 in base_visualiser from:
self.__particles.set_offset([[]]) to self.__particles.set_offset(np.random.rand(5, 2) * 4.
Seems to fix the problem as it is related to offset being empty 2d array.

Best Regards

[HaaLeo]

Hi @ivanmilevtues thx for reporting this possible fix. I hope I find time the next few days to test it and maybe release the fix :)