Weight Annotation in Information Extraction
نویسندگان
چکیده
The framework of document spanners abstracts the task information extraction from text as a function that maps every (a string) into relation over document's spans (intervals identified by their start and end indices). For instance, regular are closure under Relational Algebra (RA) expressions with capture variables, expressive power is precisely captured class VSet-automata -- restricted transducers mark endpoints selected spans. In this work, we embark on investigation can annotate extractions auxiliary such confidence, support, confidentiality measures. To end, adopt abstraction provenance semirings Green et al., where tuples annotated elements commutative semiring, annotation propagates through positive RA operators via semiring operators. Hence, proposed spanner extension, referred to an annotator, string As specific instantiation, explore weighted that, similarly automata transducers, attach transitions. We investigate key aspects expressiveness, RA, computational complexity, enumeration answers ranked in case ordered semirings. number these problems, fundamental properties underlying positivity, crucial for establishing tractability.
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ژورنال
عنوان ژورنال: Logical Methods in Computer Science
سال: 2022
ISSN: ['1860-5974']
DOI: https://doi.org/10.46298/lmcs-18(1:21)2022