[RavSinghChandan]

get_colors stepped through the hues with np.arange(0.0, 360.0, 360.0 / num_colors). A float step can include one more value, close to 360°, so get_colors(161) returned 162 colors (the last one is red again, like the first), and get_colors(0) raised ZeroDivisionError. The layout views work around the zero case with max(len(region_classes), 1), but visualize_kie_page does not, so a KIE page without any prediction class failed to render.

The hues now come from an integer range (i / num_colors), which gives exactly num_colors colors, and none for 0. For other counts the hues are the same as before

[felixdittrich92]

Thanks @RavSinghChandan 👍

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.75%. Comparing base (9ae237d) to head (fe09ef9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2190   +/-   ##
=======================================
  Coverage   97.75%   97.75%           
=======================================
  Files         170      170           
  Lines       10959    10959           
=======================================
  Hits        10713    10713           
  Misses        246      246           

Flag	Coverage Δ
unittests	97.75% <100.00%> (ø)

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