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update anls metric #44

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update anls metric #44

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9 changes: 4 additions & 5 deletions pix2struct/metrics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,11 +56,10 @@ def cider(


def anls_metric(target: str, prediction: str, theta: float = 0.5):
"""Calculates ANLS for DocVQA.
"""Calculates ANLS for DocVQA and InfographicVQA.

There does not seem to be an official evaluation script.
Public implementation on which this implementation is based:
https://github.com/herobd/layoutlmv2/blob/main/eval_docvqa.py#L92
Official evaluation script at https://rrc.cvc.uab.es/?ch=17&com=downloads
(Infographics VQA Evaluation scripts).

Original paper (see Eq 1): https://arxiv.org/pdf/1907.00490.pdf

Expand All @@ -75,7 +74,7 @@ def anls_metric(target: str, prediction: str, theta: float = 0.5):

edit_distance = editdistance.eval(target, prediction)
normalized_ld = edit_distance / max(len(target), len(prediction))
return 1 - normalized_ld if normalized_ld < theta else 0
return 1 - normalized_ld if normalized_ld <= theta else 0


def relaxed_correctness(target: str,
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