Evaluation on Windows fails due to missing ninja (use standard COCOeval)

[cmaranes]

On Windows, the evaluation step tries to import the optimized Cython version (COCOeval_opt), which in turn requires a working ninja install for JIT compilation. If ninja isn’t available, the import fails and the entire eval pipeline breaks.

🔧 Temporary Workaround

Force use of the pure-Python evaluator by swapping out the import. In
yolox/evaluators/coco_evaluator.py (around line 294):

YOLOX/yolox/evaluators/coco_evaluator.py

Line 294 in d872c71

from yolox.layers import COCOeval_opt as COCOeval

, replace:

- from yolox.evaluators.coco_opt import COCOeval_opt
+ from pycocotools.cocoeval import COCOeval

This change bypasses the ninja dependency and lets evaluation complete using the standard COCO API.

Feel free to let me know if you’d like a PR implementing the fallback logic!