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This pull request add table detection metrics. One case that was considered by me: Case: Two tables are predicted and matched with one table in ground truth Question: Is this matching correct in both cases or just for on table There are two subcases: - table was predicted by OD as two sub tables (so half in two, there are two non overlapping subtables) -> in my opinion both are correct - it is false positive from tables matching script in get_table_level_alignment -> 1 good, 1 wrong As we don't have bounding boxes I followed the notebook calculation script and assumed pessimistic, second subcase version