Regression Report matplotlib error - related to newest version

[Fabian Thiel]

Creation of Regression Performance Report causes matplotlib error on MacOSX, Ubuntu and Windows

Seems to be matplotlib version related, not OS related (as initially thought)

• Working: matplotlib 3.1.3
• Not Working: matplotlib 3.3.4

QGIS version: 3.16.3-Hannover
Qt version: 5.12.8
GDAL version: 3.0.4
GEOS version: 3.8.0-CAPI-1.13.1 
PROJ version: Rel. 6.3.1, February 10th, 2020
Processing algorithm…
Algorithm 'Regression Performance' starting…
Input parameters:
{ 'invertMask' : False, 'mask' : None, 'outReport' : './outReport.html', 'prediction' : '/mnt/c/Users/thielf54/Desktop/_temp/lenc/test1/TCD_cropped_scaled.tif', 'reference' : '/mnt/c/Users/thielf54/Desktop/_temp/lenc/test1/TCD_cropped_scaled.tif' }

{'invertMask': False, 'mask': None, 'outReport': './outReport.html', 'prediction': 'TCD_cropped_scaled_tif_ad7b8c2b_23de_4bb0_8e22_023a61ffd1dd', 'reference': 'TCD_cropped_scaled_tif_ad7b8c2b_23de_4bb0_8e22_023a61ffd1dd'}
Traceback (most recent call last):
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapboxgeoalgorithms/provider.py", line 152, in processAlgorithm
result = self.processAlgorithm_()
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapboxgeoalgorithms/algorithms.py", line 1524, in processAlgorithm_
performance.report().saveHTML(filename=filename, open=True)
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/hubflow/core.py", line 6028, in report
report.append(ReportPlot(fig)) # , caption=fittedLineText))
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/hubflow/report.py", line 176, in __init__
array = fig2rgb_array()
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/hubflow/report.py", line 170, in fig2rgb_array
figure.canvas.draw()
File "/root/.local/lib/python3.8/site-packages/matplotlib/backends/backend_agg.py", line 407, in draw
self.figure.draw(self.renderer)
File "/root/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/figure.py", line 1863, in draw
mimage._draw_list_compositing_images(
File "/root/.local/lib/python3.8/site-packages/matplotlib/image.py", line 131, in _draw_list_compositing_images
a.draw(renderer)
File "/root/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/cbook/deprecation.py", line 411, in wrapper
return func(*inner_args, **inner_kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/axes/_base.py", line 2747, in draw
mimage._draw_list_compositing_images(renderer, self, artists)
File "/root/.local/lib/python3.8/site-packages/matplotlib/image.py", line 131, in _draw_list_compositing_images
a.draw(renderer)
File "/root/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/collections.py", line 931, in draw
Collection.draw(self, renderer)
File "/root/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/collections.py", line 406, in draw
renderer.draw_path_collection(
File "/root/.local/lib/python3.8/site-packages/matplotlib/backends/backend_agg.py", line 172, in draw_path_collection
return self._renderer.draw_path_collection(
ValueError: Expected 2-dimensional array, got 1

Traceback (most recent call last):
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapboxgeoalgorithms/provider.py", line 152, in processAlgorithm
result = self.processAlgorithm_()
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapboxgeoalgorithms/algorithms.py", line 1524, in processAlgorithm_
performance.report().saveHTML(filename=filename, open=True)
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/hubflow/core.py", line 6028, in report
report.append(ReportPlot(fig)) # , caption=fittedLineText))
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/hubflow/report.py", line 176, in __init__
array = fig2rgb_array()
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/hubflow/report.py", line 170, in fig2rgb_array
figure.canvas.draw()
File "/root/.local/lib/python3.8/site-packages/matplotlib/backends/backend_agg.py", line 407, in draw
self.figure.draw(self.renderer)
File "/root/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/figure.py", line 1863, in draw
mimage._draw_list_compositing_images(
File "/root/.local/lib/python3.8/site-packages/matplotlib/image.py", line 131, in _draw_list_compositing_images
a.draw(renderer)
File "/root/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/cbook/deprecation.py", line 411, in wrapper
return func(*inner_args, **inner_kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/axes/_base.py", line 2747, in draw
mimage._draw_list_compositing_images(renderer, self, artists)
File "/root/.local/lib/python3.8/site-packages/matplotlib/image.py", line 131, in _draw_list_compositing_images
a.draw(renderer)
File "/root/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/collections.py", line 931, in draw
Collection.draw(self, renderer)
File "/root/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/root/.local/lib/python3.8/site-packages/matplotlib/collections.py", line 406, in draw
renderer.draw_path_collection(
File "/root/.local/lib/python3.8/site-packages/matplotlib/backends/backend_agg.py", line 172, in draw_path_collection
return self._renderer.draw_path_collection(
ValueError: Expected 2-dimensional array, got 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapboxgeoalgorithms/provider.py", line 166, in processAlgorithm
raise Exception('unexpected error')
Exception: unexpected error

Execution failed after 0.79 seconds

Loading resulting layers
Algorithm 'Regression Performance' finished

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[Benjamin Jakimow]

I don’t have much experience with matplotlib. @Andreas Janz can you provide a short snipped that we can use to test fig2rgb_array or figure.canvas.draw() from QGIS python?

[Fabian Thiel]

It seems to work until matplotlib 3.2.2, with >=3.3.0 something changed.

Shall I update the requirements.txt for the time being?

Maybe relevant: https://matplotlib.org/stable/users/whats_new.html#what-s-new-in-matplotlib-3-3-0

[Andreas Janz]

[Fabian Thiel]

The problem is, @Benjamin Jakimow 's Package Installer uses the local requirements file. Hence a change now will have no effect for the version in the plugion repo. Unless we say we want to include it in tomorrows (?) update?

[Benjamin Jakimow]

I’d prefer to make it running with the recent matplotlib release instead of enforcing older versions.

[Andreas Janz]

will fix this for v3.8 till end of March