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Error in dyn.mv.animate_fates

See original GitHub issue

Hi, I am interested in animate fate transition, but I get an error when run the codes:

progenitor = adata.obs_names[adata.obs.celltype.isin(['Mono'])]
dyn.pd.fate(adata, basis='umap', init_cells=progenitor, interpolation_num=100,  direction='forward',
   inverse_transform=False, average=False, cores=3)
fig, ax = plt.subplots()
ax = dyn.pl.topography(adata, color='celltype', ax=ax, save_show_or_return='return')
dyn.mv.animate_fates(adata, color='celltype', basis='umap', n_steps=100, fig=fig, ax=ax,
                     save_show_or_return='save', logspace=True, max_time=None)

|-----? the number of cell states with fate prediction is more than 50. You may want to lower the max number of cell states to draw via cell_states argument.
MovieWriter stderr:
convert: unexpected end-of-file `-': No such file or directory @ error/rgb.c/ReadRGBImage/243.
convert: no images defined `fate_ani.gif' @ error/convert.c/ConvertImageCommand/3235.
Traceback (most recent call last):
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/matplotlib/animation.py", line 236, in saving
    yield self
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/matplotlib/animation.py", line 1091, in save
    anim._draw_next_frame(d, blit=False)
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/matplotlib/animation.py", line 1126, in _draw_next_frame
    self._draw_frame(framedata)
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/matplotlib/animation.py", line 1720, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/dynamo/movie/fate.py", line 222, in update
    self.ax.lines = []
AttributeError: can't set attribute

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/dynamo/movie/fate.py", line 363, in animate_fates
    anim.save(**save_kwargs_)  # save as gif file.
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/matplotlib/animation.py", line 1095, in save
    writer.grab_frame(**savefig_kwargs)
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/contextlib.py", line 131, in __exit__
    self.gen.throw(type, value, traceback)
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/matplotlib/animation.py", line 238, in saving
    self.finish()
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/matplotlib/animation.py", line 344, in finish
    self._cleanup()  # Inline _cleanup() once cleanup() is removed.
  File "/NAS/lh/software/miniconda3/envs/dynamonew/lib/python3.8/site-packages/matplotlib/animation.py", line 375, in _cleanup
    raise subprocess.CalledProcessError(
subprocess.CalledProcessError: Command '['convert', '-size', '640x480', '-depth', '8', '-delay', '10.0', '-loop', '0', 'rgba:-', 'fate_ani.gif']' returned non-zero exit status 1.