Parametrize inline gridliner tests #1900
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All images generated with Matplotlib 3.5.0rc1, so we'll have to see if they need tolerance increases. |
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Overall I think this is a really nice improvement. Now if a projection is changed, only that one image would need to be updated.
When you are listing out the updates to the images and say that now the labels are every 10 degrees instead of 20. Has it been that way for a while and our tolerances were just so large that we didn't bother updating the images? Or, is it that the default style updates the locators?
Changing the style changes the locator. Just rebuilding with the classic style only has the second set of changes (plus or minus a few small ones). |
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Without titles, the new set of images appears to be smaller even than the two originals. |
Unlike the old `ImageTesting` decorator, pytest-mpl support parametrized tests. While this does add a bunch of new tests/images, they are all far smaller than the single test, and can be run in parallel. Since they are all generated anew, I switched to the new mpl20 style. Besides the style, I believe this causes the following changes to gridline locations for inline: - EuroPP labels are half the tick interval as before - OSNI labels latitude every 0.5° instead of every 1° and for inline USA: - InterruptedGoodeHomolosine labels longitude every 10° instead of every 20° - LambertConformal labels longitude every 10° instead of every 20° - NorthPolarStereo labels latitude every 5° instead of every 10° - Robinson labels longitude every 10° instead of every 20° - Stereographic labels longitude every 10° instead of every 20° The automatic display of labels has a few small differences in the inline results, probably due to different Axes size: - Geostationary labels 20°W and 40°E instead of 0° - LambertAzimuthalEqualArea also labels 30°N/30°S somehow - LambertConformal also labels the inner 60°W - NearsidePerspective labels 40°E instead of 60°E - Orthographic also labels 0° longitude - OSGB also labels 6°W and 2°W on the top, and 4°W on the bottom - Robinson also labels 60°W For the inline USA results, there are fewer differences: - AzimuthalEquidistant also labels 60°N, but somewhat poorly - EuroPP, OSGB, and OSNI are skipped since their extent is locked - Geostationary also labels 60°W on the bottom - Gnomonic also labels 68°W - NearsidePerspective also labels 60°W on the bottom - Orthographic also labels 70°W on the bottom
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| def test_grid_labels_inline_usa(): | ||
| print(plt.get_backend()) | ||
| @pytest.mark.parametrize('proj', TEST_PROJS) | ||
| @pytest.mark.mpl_image_compare(style='mpl20', tolerance=0.79) |
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Only really NorthPolarStereo fails, but this is pretty close to 0.5, so I just did it for everything.
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Should this only be for the MPL < 3.5 cases?
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Could be, but it was close enough to the default 0.5 that maybe it's okay everywhere?
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👍 Much better than the previous 40+ on some of the images :) I think breaking these up into smaller tests will also help to not grow the tolerances quite as much arbitrarily too.
Tis fixes test on minimum Matplotlib
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Some of the label positioning does look awkward, like in the Geostationary choosing 40, 20, 60, instead of centering on 0. But you aren't doing anything in this, that is all automatically being chosen. I think those "defaults" can be improved in follow-up PRs. |
Rationale
Unlike the old
ImageTestingdecorator, pytest-mpl support parametrized tests. While this does add a bunch of new tests/images, they are all far smaller than the single test, and can be run in parallel.Implications
The overhead of all the individual images is only ~6% bigger than the two mega test images.
Previously, our 5 slowest gridliner tests were:
and now they are:
But instead of getting stuck on one single test for almost 2 minutes, we can run in 4-way parallel at about 70.17s.
Since they are all generated anew, I switched to the new mpl20 style. Besides the style, I believe this causes the following changes to gridline locations for inline:
EuroPPlabels are half the tick interval as beforeOSNIlabels latitude every 0.5° instead of every 1°and for inline USA:
InterruptedGoodeHomolosinelabels longitude every 10° instead of every 20°LambertConformallabels longitude every 10° instead of every 20°NorthPolarStereolabels latitude every 5° instead of every 10°Robinsonlabels longitude every 10° instead of every 20°Stereographiclabels longitude every 10° instead of every 20°The automatic display of labels has a few small differences in the inline results, probably due to different Axes size:
Geostationarylabels 20°W and 40°E instead of 0°LambertAzimuthalEqualAreaalso labels 30°N/30°S somehowLambertConformalalso labels the inner 60°WNearsidePerspectivelabels 40°E instead of 60°EOrthographicalso labels 0° longitudeOSGBalso labels 6°W and 2°W on the top, and 4°W on the bottomRobinsonalso labels 60°WFor the inline USA results, there are fewer differences:
AzimuthalEquidistantalso labels 60°N, but somewhat poorlyEuroPP,OSGB, andOSNIare skipped since their extent is lockedGeostationaryalso labels 60°W on the bottomGnomonicalso labels 68°WNearsidePerspectivealso labels 60°W on the bottomOrthographicalso labels 70°W on the bottom