René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"3.2.0: error while generating doc gallery: `ValueError: operands could not be broadcast together with shapes (370,370) (100,100)`","articleBody":"Hello,\r\nwhile preparing 3.2.0 for Debian, the documentation gallery build process failed with:\r\n\r\n```\r\n...\r\ngenerating gallery for gallery/images_contours_and_fields... [ 38%] image_demo.py\r\ngenerating gallery for gallery/images_contours_and_fields... [ 40%] image_masked.py\r\ngenerating gallery for gallery/images_contours_and_fields... [ 42%] image_nonuniform.py\r\ngenerating gallery for gallery/images_contours_and_fields... [ 45%] image_transparency_blend.py\r\n\r\nException occurred:\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/image.py\", line 530, in _make_image\r\n    np.asarray(alpha_channel, np.float32) * out_alpha * alpha,\r\nValueError: operands could not be broadcast together with shapes (370,370) (100,100)\r\nThe full traceback has been saved in /tmp/sphinx-err-glmke_9_.log, if you want to report the issue to the developers.\r\nPlease also report this if it was a user error, so that a better error message can be provided next time.\r\nA bug report can be filed in the tracker at \u003chttps://github.com/sphinx-doc/sphinx/issues\u003e. Thanks!\r\n```\r\n\r\nthe content of `/tmp/sphinx-err-glmke_9_.log` is:\r\n\r\n```\r\n# Sphinx version: 1.8.5\r\n# Python version: 3.8.2 (CPython)\r\n# Docutils version: 0.16 release\r\n# Jinja2 version: 2.10.1\r\n# Last messages:\r\n\r\n# Loaded extensions:\r\nTraceback (most recent call last):\r\n  File \"/usr/lib/python3/dist-packages/sphinx/cmd/build.py\", line 300, in build_main\r\n    app = Sphinx(args.sourcedir, args.confdir, args.outputdir,\r\n  File \"/usr/lib/python3/dist-packages/sphinx/application.py\", line 263, in __init__\r\n    self._init_builder()\r\n  File \"/usr/lib/python3/dist-packages/sphinx/application.py\", line 325, in _init_builder\r\n    self.emit('builder-inited')\r\n  File \"/usr/lib/python3/dist-packages/sphinx/application.py\", line 510, in emit\r\n    return self.events.emit(event, self, *args)\r\n  File \"/usr/lib/python3/dist-packages/sphinx/events.py\", line 80, in emit\r\n    results.append(callback(*args))\r\n  File \"/usr/lib/python3/dist-packages/sphinx_gallery/gen_gallery.py\", line 283, in generate_gallery_rst\r\n    generate_dir_rst(src_dir, target_dir, gallery_conf,\r\n  File \"/usr/lib/python3/dist-packages/sphinx_gallery/gen_rst.py\", line 327, in generate_dir_rst\r\n    intro, cost = generate_file_rst(\r\n  File \"/usr/lib/python3/dist-packages/sphinx_gallery/gen_rst.py\", line 740, in generate_file_rst\r\n    output_blocks, time_elapsed = execute_script(script_blocks,\r\n  File \"/usr/lib/python3/dist-packages/sphinx_gallery/gen_rst.py\", line 659, in execute_script\r\n    output_blocks = [execute_code_block(compiler, block,\r\n  File \"/usr/lib/python3/dist-packages/sphinx_gallery/gen_rst.py\", line 659, in \u003clistcomp\u003e\r\n    output_blocks = [execute_code_block(compiler, block,\r\n  File \"/usr/lib/python3/dist-packages/sphinx_gallery/gen_rst.py\", line 565, in execute_code_block\r\n    images_rst = save_figures(block, script_vars, gallery_conf)\r\n  File \"/usr/lib/python3/dist-packages/sphinx_gallery/scrapers.py\", line 236, in save_figures\r\n    rst = scraper(block, block_vars, gallery_conf)\r\n  File \"/usr/lib/python3/dist-packages/sphinx_gallery/scrapers.py\", line 99, in matplotlib_scraper\r\n    fig.savefig(image_path, **these_kwargs)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/figure.py\", line 2180, in savefig\r\n    self.canvas.print_figure(fname, **kwargs)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/backend_bases.py\", line 2082, in print_figure\r\n    result = print_method(\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py\", line 527, in print_png\r\n    FigureCanvasAgg.draw(self)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py\", line 388, in draw\r\n    self.figure.draw(self.renderer)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/artist.py\", line 38, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/figure.py\", line 1708, in draw\r\n    mimage._draw_list_compositing_images(\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/image.py\", line 135, in _draw_list_compositing_images\r\n    a.draw(renderer)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/artist.py\", line 38, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/axes/_base.py\", line 2647, in draw\r\n    mimage._draw_list_compositing_images(renderer, self, artists)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/image.py\", line 135, in _draw_list_compositing_images\r\n    a.draw(renderer)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/artist.py\", line 38, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/image.py\", line 618, in draw\r\n    im, l, b, trans = self.make_image(\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/image.py\", line 879, in make_image\r\n    return self._make_image(\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/image.py\", line 530, in _make_image\r\n    np.asarray(alpha_channel, np.float32) * out_alpha * alpha,\r\nValueError: operands could not be broadcast together with shapes (370,370) (100,100) \r\n```\r\n\r\nSome noteworthy deps are:\r\n\r\n* numpy 1.17.4\r\n* sphinx 1.8.5\r\n* sphinx-gallery: 0.5.0\r\n* python 3.8.2","author":{"url":"https://github.com/sandrotosi","@type":"Person","name":"sandrotosi"},"datePublished":"2020-03-07T19:53:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/16707/matplotlib/issues/16707"}