[Fix]Fix CCOCR evaluation for long text inputs - #1647
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Problem
CCOCR evaluation uses
nltk.edit_distancefor document parsing and table-cell TEDS comparison. Recent NLTK versions reject inputs longer than 2000 elements, causing evaluation to fail on long OCR/document outputs.Changes
editdistancedependency.This preserves the Levenshtein-distance metric while avoiding NLTK's fixed safety limit.
Tests
/workspace/s/ljh/env/qwen35_official_vllm/bin/python -m unittest -v tests/test_ccocr_evaluator.pygit diff --check