ValueError: min() arg is an empty sequence

[ninja-otaku]

Hi, I am trying to convert a pdf to HTMl using pdftotree package. But I am getting this following error. Kindly look into it and let me know what the issue is.

File "<ipython-input-73-485b6311ae55>", line 1, in <module>
    a = pdftotree.parse('O:\\Project\\ConocoPhilips-Sustainability-Report.pdf',html_path=None, model_type=None, model_path=None, favor_figures=True, visualize=False)

  File "C:\Continuum\anaconda3\lib\site-packages\pdftotree\core.py", line 65, in parse
    pdf_tree = extractor.get_tree_structure(model_type, model, favor_figures)

  File "C:\Continuum\anaconda3\lib\site-packages\pdftotree\TreeExtract.py", line 238, in get_tree_structure
    favor_figures,

  File "C:\Continuum\anaconda3\lib\site-packages\pdftotree\utils\pdf\pdf_parsers.py", line 762, in parse_tree_structure
    mentions, elems.layout.bbox, page_num, boxes_figures, page_width, page_height

  File "C:\Continuum\anaconda3\lib\site-packages\pdftotree\utils\pdf\pdf_parsers.py", line 1246, in get_figures
    node_fig = Node(fig_box)

  File "C:\Continuum\anaconda3\lib\site-packages\pdftotree\utils\pdf\node.py", line 47, in __init__
    self.set_bbox(bound_elems(elems))

  File "C:\Continuum\anaconda3\lib\site-packages\pdftotree\utils\pdf\vector_utils.py", line 121, in bound_elems
    group_x0 = min(map(lambda l: l.x0, elems))

ValueError: min() arg is an empty sequence

[lukehsiao]

Can you attach the document that caused the error?

[ninja-otaku]

ConocoPhilips-Sustainability-Report.pdf
Hi, I am attaching the file with this comment.

[lukehsiao]

$ pdftotree ConocoPhilips-Sustainability-Report.pdf -vv
[INFO] pdftotree.core - Digitized PDF detected, building tree structure...
[INFO] pdftotree.TreeExtract - No boxes were found on page 1.
[INFO] pdftotree.TreeExtract - No boxes were found on page 4.
[INFO] pdftotree.TreeExtract - No boxes were found on page 5.
[INFO] pdftotree.TreeExtract - No boxes were found on page 6.
[INFO] pdftotree.TreeExtract - No boxes were found on page 7.
[INFO] pdftotree.TreeExtract - No boxes were found on page 8.
[INFO] pdftotree.TreeExtract - No boxes were found on page 10.
[INFO] pdftotree.TreeExtract - No boxes were found on page 11.
[INFO] pdftotree.TreeExtract - No boxes were found on page 12.
[INFO] pdftotree.TreeExtract - No boxes were found on page 14.
[INFO] pdftotree.TreeExtract - No boxes were found on page 15.
[INFO] pdftotree.TreeExtract - No boxes were found on page 18.
[INFO] pdftotree.TreeExtract - No boxes were found on page 19.
[INFO] pdftotree.TreeExtract - No boxes were found on page 20.
[INFO] pdftotree.TreeExtract - No boxes were found on page 23.
[INFO] pdftotree.TreeExtract - No boxes were found on page 25.
[INFO] pdftotree.TreeExtract - No boxes were found on page 26.
[INFO] pdftotree.TreeExtract - No boxes were found on page 29.
[INFO] pdftotree.TreeExtract - No boxes were found on page 34.
[INFO] pdftotree.TreeExtract - No boxes were found on page 35.
[INFO] pdftotree.TreeExtract - No boxes were found on page 37.
[INFO] pdftotree.TreeExtract - No boxes were found on page 42.
[INFO] pdftotree.TreeExtract - No boxes were found on page 54.
[INFO] pdftotree.TreeExtract - No boxes were found on page 55.
[INFO] pdftotree.TreeExtract - No boxes were found on page 60.
Traceback (most recent call last):
  File ".venv/bin/pdftotree", line 116, in <module>
    args.visualize,
  File ".venv/lib/python3.6/site-packages/pdftotree/core.py", line 65, in parse
    pdf_tree = extractor.get_tree_structure(model_type, model, favor_figures)
  File ".venv/lib/python3.6/site-packages/pdftotree/TreeExtract.py", line 238, in get_tree_structure
    favor_figures,
  File ".venv/lib/python3.6/site-packages/pdftotree/utils/pdf/pdf_parsers.py", line 762, in parse_tree_structure
    mentions, elems.layout.bbox, page_num, boxes_figures, page_width, page_height
  File ".venv/lib/python3.6/site-packages/pdftotree/utils/pdf/pdf_parsers.py", line 1246, in get_figures
    node_fig = Node(fig_box)
  File ".venv/lib/python3.6/site-packages/pdftotree/utils/pdf/node.py", line 47, in __init__
    self.set_bbox(bound_elems(elems))
  File ".venv/lib/python3.6/site-packages/pdftotree/utils/pdf/vector_utils.py", line 121, in bound_elems
    group_x0 = min(map(lambda l: l.x0, elems))
ValueError: min() arg is an empty sequence

Re-opening this issue. It's good to have these open until someone is able to debug it.

[mgoo]

Just wanted to point out that I had the same error on this file
IFT_Infratil_2017.pdf

[mgoo]

I had a go debugging this
The problem seems to be that when the Node instance is being created for the figures a single element is passed to the contributor of the node call rather than a list of elements.