[RavSinghChandan]

create_shadow_mask (used by RandomShadow) sometimes raised a bare ValueError with no message. After the contour is rotated and rounded to pixels, a corner of the shadow base and the tip corner next to it can land on the same pixel, and expand_line then gets a line of length 0: it has no direction, so no edge point matches and it falls through to raise ValueError.

Running create_shadow_mask with seeds 0-4999 raised it once for a 64x64 image (seed 3074) and 15 times for 8x8, so a long training run with RandomShadow eventually stops on it. expand_line now keeps the first point when both points coincide, and all 45,000 runs over 9 image shapes pass.

Tests: a coinciding line in test_expand_line, and create_shadow_mask with the two failing random draws pinned through monkeypatch, like test_create_shadow_mask_covers_every_direction. They fail on main

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.77%. Comparing base (b690ba9) to head (26486fc).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2212      +/-   ##
==========================================
- Coverage   97.78%   97.77%   -0.02%     
==========================================
  Files         170      170              
  Lines       10993    10995       +2     
==========================================
  Hits        10750    10750              
- Misses        243      245       +2     

Flag	Coverage Δ
unittests	97.77% <100.00%> (-0.02%)	⬇️

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[felixdittrich92]

Thanks 👍