Outline of the Ephyra Source Code

Ephyra main classes

• Ephyra2 (most recent version of Ephyra): Ephyra/src/info/ephyra/Ephyra2.java
• Ephyra2 with answer projection on a text corpus: Ephyra/src/info/ephyra/trec/Ephyra2Corpus.java

QA pipeline

• Modules:
  • Question analysis: Ephyra/src/info/ephyra/questionanalysis/
  • Query generation: Ephyra/src/info/ephyra/querygeneration/
  • Search Ephyra/src/info/ephyra/search/
  • Answer extraction and selection: Ephyra/src/info/ephyra/answerselection/

• Standardized components:
  • Query generators extend Ephyra/src/info/ephyra/querygeneration/generators/QueryGenerator.java
  • Knowledge miners (for unstructured sources) extend Ephyra/src/info/ephyra/search/searchers/KnowledgeMiner.java
  • Knowledge annotators (for (semi)structured sources) extend Ephyra/src/info/ephyra/search/searchers/KnowledgeAnnotator.java
  • Filters (for answer extraction and selection) extend Ephyra/src/info/ephyra/answerselection/filters/Filter.java

• Data structures:
  • Analyzed question: Ephyra/src/info/ephyra/questionanalysis/AnalyzedQuestion.java
  • Query: Ephyra/src/info/ephyra/querygeneration/Query.java
  • Result: Ephyra/src/info/ephyra/search/Result.java

Other useful resources and tools

• NLP:
  • Sentence segmentation, tokenization, POS tagging, phrase chunking, full syntactic parsing, NE tagging, stemming, verb form conversion: Ephyra/src/info/ephyra/nlp/
  • Function words, irregular verbs, word frequencies: Ephyra/src/info/ephyra/nlp/indices/
  • Semantic parsing: Ephyra/src/info/ephyra/nlp/semantics/
  • Ontologies for term extraction and expansion: Ephyra/src/info/ephyra/nlp/semantics/ontologies/

• Tools for TREC: Ephyra/src/info/ephyra/trec/
  • Ephyra with answer projection on a text corpus
  • Evaluation tools
  • Parsers for TREC question and pattern files
  • Target preprocessing
  • Resolution of coreferences in TREC questions

• Preprocessing tools for several text corpora: Ephyra/src/info/ephyra/indexing/
  • AQUAINT newswire corpus
  • AQUAINT2 newswire corpus
  • Blog06 crawl of blogs

• Collection of useful tools: Ephyra/src/info/ephyra/util/
  • Conversion of regular expressions
  • HTML conversion
  • File access
  • Caching
  • String manipulation and comparison

• Message printing and logging: Ephyra/src/info/ephyra/io/

• A sandbox to test individual components: Ephyra/src/info/ephyra/test/