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Copy or Not

Copy or Not. Dawei (David) Shi. Copy Or Not. Introduction Algorithm Framework Future work Demo. Copy Or Not. Introduction Algorithm Framework Future work Demo. Introduction. A web-based document comparator Calculate accurate similarity between 2 documents. Copy Or Not.

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Copy or Not

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  1. Copy or Not Dawei (David) Shi

  2. Copy Or Not • Introduction • Algorithm • Framework • Future work • Demo

  3. Copy Or Not • Introduction • Algorithm • Framework • Future work • Demo

  4. Introduction • A web-based document comparator • Calculate accurate similarity between 2 documents

  5. Copy Or Not • Introduction • Algorithm • Framework • Future work • Demo

  6. Algorithm • Preprocessing • Vector space • Similarity calculation

  7. Preprocessing

  8. Preprocessing • Stemming • Porter Stemming Algorithm • E.g. • cat – cats • meet – meeting • agree – agreed • correct - correctness

  9. Vector Space • Build dictionary 1 • word -> frequency • Sort the keys of dictionary 1 • Build dictionary 2 • key -> (index, count) • Build binary vectors • index -> occurrence

  10. Similarity Calculation • Vectors v1 and v2 • Similarity = v1 * v2 / (norm(v1) * norm(v2))

  11. Performance • Algorithms coded in Python • Dynamic typing • Not good at numerical operations • Solution: numpy

  12. Numpy • A Python extension module • Written mostly in C • Define numerical array and matrix types and basic operations on them

  13. Numpyvs Python • Python code • a = range(10000000) • b = range(10000000) • c = [] • for i in range(len(a)): • c.append(a[i] + b[i]) • Takes up to 10 seconds on a several GHz processor

  14. Numpyvs Python • Numpy code • import numpy as np • a = np.arrange(10000000) • a = np.arrange(10000000) • c = a + b • Almost Instant

  15. Numpy Usage • Vector dot product • Vector normalization • Vector zero filling

  16. Copy Or Not • Introduction • Algorithm • Framework • Future work • Demo

  17. Framework • Django • The web framework for perfectionists with deadlines

  18. Libraries • Python • Numpy • Porter Stemming • jQuery

  19. Hosting • Alwaysdata • Django 1.3 • Python 2.6

  20. Copy Or Not • Introduction • Algorithm • Framework • Future work • Demo

  21. Future Work • Support file uploading and comparison • Add HTML5 features

  22. Copy Or Not • Introduction • Algorithm • Framework • Future work • Demo

  23. Demo • http://imds.alwaysdata.net

  24. Thank you!

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