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A full week of learning [http://en.wikipedia.org/wiki/General_Architecture_for_Text_Engineering GATE] text mining/information extraction language processing and talks. [http://gate.ac.uk/wiki/TrainingCourseAug2010/ Session wiki] | |||
[[File:GATE_screenshot.png|900px|GATE developer screenshot]] | |||
GATE is written in Java and very Java centric. This makes it portable, fast, and heavyweight. A programming library is available. It's 14 years old and has many users and contributors. | |||
= Using GATE developer = | |||
* GATE developer is used to process sets of Language Resources in Corpus using Processing Resources. They are typically saved to a serialized Datastore. | |||
* ANNIE, VG (verb group) processors. | |||
* Preserve formatting embeds tags in HTML or XML. | |||
** Different strengths using GATE's graph (node/offset) based XML vs. preserved formatting (original xml/html) | |||
= Information Extraction = | |||
* IR - retrieve docs | |||
* IE - retreive structured data | |||
* Knowledge Engineering - rule based | |||
* Learning Systems - statistical | |||
Old Bailey IE project - old english (Online) | |||
* POS - assigned in Token (noun, verb, etc) | |||
* Gazateer - gotcha, have to set initialization parameter listsURL before it's | |||
loaded. Must also "save and reinitialize." | |||
* Gazeteer creates Lookups, then transducer creaties named entities | |||
* Then orthomatcher (spelling features in common) coreference associates those | |||
* Annotation Key sets and annotation comparing | |||
** Need setToKeep key in Document Reset for any pre annotated texts | |||
== Evaluation / Metrics == | |||
* Evaluation metric - mathematically against human annotated | |||
* Scoring - performance measures for annotation types | |||
* Result types - Correct, missing, spurious, partially correct (overlapped) | |||
* Tools > Annotations Diff - comparing human vs machine annotation | |||
* Corpus > Corpus quality assurance - compare by type | |||
* (B has to be the generated set) | |||
* Annotation set transfer (in tools) - transfer between docs in pipeline | |||
** useful for eg HTML that has boilerplate | |||
=== To investigate === | |||
* markupAware for HTML/XML (keeps tags in editor) | |||
* AnnotationStack | |||
* Advanced Options | |||
= JAPE = | |||
* Rules based on tokens and lookups | |||
== To review, gotchas == | |||
* Rule types : first takes only first match, excludes compound | |||
** a? b for "a b" will match "a b" | |||
* multiplexor tranducers | |||
* multi-constraint statements | |||
* macros | |||
* To reuse created annotations has to be a separate rule | |||
{{Blikied|Aug 30, 2010}} | |||
[[Category:SemWeb]] | |||