Se ha denunciado esta presentación.
Utilizamos tu perfil de LinkedIn y tus datos de actividad para personalizar los anuncios y mostrarte publicidad más relevante. Puedes cambiar tus preferencias de publicidad en cualquier momento.

Crowdsourcing & Semantic Web: Dagstuhl 2014 (Presentation Lora)

3.641 visualizaciones

Publicado el

CrowdTruth:
What is disagreement & why does it make more sense than agreement?
http://crowdtruth.org

  • Sé el primero en comentar

Crowdsourcing & Semantic Web: Dagstuhl 2014 (Presentation Lora)

  1. 1. CrowdTruth What is disagreement & why does it make more sense than agreement? Lora Aroyo & Chris Welty
  2. 2. problem cognitive computing systems need annotated data for training, testing, evaluation
  3. 3. solution human annotation through crowdsourcing augmented with machine processing
  4. 4. What's wrong with the gold standard? ●  algorithmic performance is measured on test sets vetted by human experts → never perfectly correct ●  gold standards are created assuming that for each annotated instance there is a single right answer → doesn’t account for alternative interpretations & clarity ●  gold standard quality is measured in inter-annotator agreement → what happens if disagreeing annotators are both right? The fallacy of the “one truth” assumption that pervades computational semantics
  5. 5. One Truth? Does each sentence express the TREAT relation? ANTIBIOTICS are the first line treatment for indications of TYPHUS. à agreement 95% Patients with TYPHUS who were given ANTIBIOTICS exhibited several side-effects. à agreement 80% With ANTIBIOTICS in short supply, DDT was used during World War II to control the insect vectors of TYPHUS. à agreement 50%
  6. 6. One Truth? Does each sentence express the TREAT relation? ANTIBIOTICS are the first line treatment for indications of TYPHUS. à agreement 95% Patients with TYPHUS who were given ANTIBIOTICS exhibited several side-effects. à agreement 80% With ANTIBIOTICS in short supply, DDT was used during World War II to control the insect vectors of TYPHUS. à agreement 50% Disagreement can reflect lack of clarity in a sentence
  7. 7. What is the relation between the highlighted terms? GADOLINIUM agents are useful for patients with renal impairment, but in patients with severe renal failure requiring dialysis it presents a risk of nephrogenic systemic FIBROSIS. One Interpretation? Disagreement can indicate alternative interpretations of relations cause or side effect ?
  8. 8. Does each sentence express the TREAT relation? ANTIBIOTICS are the first line treatment for indications of TYPHUS. QUININE is not a reliable cure for MALARIA. Disagreement can indicate low quality workers One Quality?
  9. 9. Why Disagreement Happens
  10. 10. Why Disagreement Happens
  11. 11. Why Disagreement Happens
  12. 12. Why Disagreement Happens
  13. 13. Why Disagreement Happens Disagreement is usefull
  14. 14. CrowdTruth Annotator disagreement is signal, not noise. It is indicative of the variation in human semantic interpretation of signs It can indicate ambiguity, vagueness, similarity, over-generality, etc, as well as quality
  15. 15. CrowdTruth is the response to the current reality of cognitive computing systems - driven by data analytics & elevated by interpretation. it supports the need to bring the human semantics, representing the dynamics of opinions and perspectives, into machine readable form
  16. 16. CrowdTruth captures and represents human semantics & thus helps extending the capabilities of cognitive computing systems
  17. 17. crowdtruth.org

×