René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Doc]: Build failures on CircleCI","articleBody":"### Documentation Link\n\n_No response_\n\n### Problem\n\nSince a few days ago, docs have been failing to build on CircleCI with:\n```\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FFMpegFileWriter.frame_format [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FFMpegFileWriter.frame_size [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FFMpegFileWriter.output_args [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FileMovieWriter.frame_size [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FileMovieWriter.supported_formats [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FuncAnimation.pause [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FuncAnimation.resume [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FuncAnimation.save [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FuncAnimation.to_html5_video [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.FuncAnimation.to_jshtml [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.HTMLWriter.frame_format [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.HTMLWriter.frame_size [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.ImageMagickFileWriter.frame_format [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.ImageMagickFileWriter.frame_size [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.ImageMagickWriter.frame_size [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.ImageMagickWriter.supported_formats [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.MovieWriter.frame_size [ref.obj]\n/home/circleci/project/doc/:1:\u003cautosummary\u003e:1: WARNING: py:obj reference target not found: matplotlib.animation.PillowWriter.frame_size [ref.obj]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches._Style [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Curve [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ArrowStyle._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches._Style [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches._Style [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ConnectionStyle._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ConnectionStyle._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ConnectionStyle._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ConnectionStyle._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches.ConnectionStyle._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axes_grid1.axes_size._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axes_grid1.axes_size._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axes_grid1.axes_size._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axes_grid1.axes_size._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axes_grid1.axes_size._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axes_grid1.axes_size._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axes_grid1.axes_size._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.patches._Style [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axisartist.axisline_style.AxislineStyle._Base [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axisartist.axislines._FixedAxisArtistHelperBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axisartist.axislines._FloatingAxisArtistHelperBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axisartist.axislines._FixedAxisArtistHelperBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: mpl_toolkits.axisartist.axislines._FloatingAxisArtistHelperBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.backend_bases._Backend [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.backends._backend_pdf_ps.RendererPDFPSBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.backends._backend_pdf_ps.RendererPDFPSBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.backends._backend_tk.FigureCanvasTk [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.backends._backend_tk.FigureCanvasTk [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolCopyToClipboardBase'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolSetCursor'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolForward'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolFullScreen'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolGrid'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolMinorGrid'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolHelpBase'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolHome'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolPan'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolCursorPosition'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolQuit'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolQuitAll'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.RubberbandBase'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.SaveFigureBase'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ConfigureSubplotsBase'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolViewsPositions'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolXScale'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolYScale'\u003e [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: \u003cclass 'matplotlib.backend_tools.ToolZoom'\u003e} [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: numpy.typing.NDArray [ref.class]\n\u003cunknown\u003e:1: WARNING: py:class reference target not found: numpy.float64 [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.image._ImageBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.image._ImageBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.image._ImageBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.text._AnnotationBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.projections.geo._GeoTransform [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.projections.geo._GeoTransform [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.projections.geo._GeoTransform [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.projections.geo._GeoTransform [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.projections.geo._GeoTransform [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.projections.geo._GeoTransform [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.projections.geo._GeoTransform [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.projections.geo._GeoTransform [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.text._AnnotationBase [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.transforms._BlendedMixin [ref.class]\n\u003cunknown\u003e:4: WARNING: py:class reference target not found: matplotlib.transforms._BlendedMixin [ref.class]\n```\nSeemingly, the difference between the last working and first failing build has been `docutils` 0.21.4-\u003e0.22.4, `sphinx` 8.2.3-\u003e9.1.0, and `sphinx-design` 0.6.1-\u003e0.7.0. Unfortunately, updating my venv to use these versions, I cannot reproduce the failures locally.\n\nLooking at the warnings, there seems to be something wrong with parsing source locations, as there are many `\u003cunknown\u003e` or `/home/circleci/project/doc/` (which seems to have been split or made relative incorrectly somehow?) but for items that should already be in the ignore file.\n\n### Suggested improvement\n\nAs I can't reproduce, it's difficult to come up with a fix. I've written up these notes in case someone else has some ideas.","author":{"url":"https://github.com/QuLogic","@type":"Person","name":"QuLogic"},"datePublished":"2026-01-23T04:14:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/31019/matplotlib/issues/31019"}