Machine learning support vector machines
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PHP talk for the Dutch PHP Conference 2016.
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Machine learning support vector machines
- 1. Machine Learning Support Vector Machines
- 2. Sjoerd Maessen • AFOL • Works at E-sites Breda • Stock market enthusiast
- 3. Titanic The chance of survival
- 4. PassengerId Survived Pclass Name Sex Age SibSp Parch Ticket Fare Cabin Embarked 1 0 3 Braund, Mr. Owen Harris male 22 1 0 A/5 21171 7.25 S 2 1 1 Cumings, Mrs. John Bradley (Florence Briggs Thayer) female 38 1 0 PC 17599 712.833 C85 C 3 1 3 Heikkinen, Miss. Laina female 26 0 0 STON/O2. 3101282 7.925 S 4 1 1 Futrelle, Mrs. Jacques Heath (Lily May Peel) female 35 1 0 113803 53.1 C123 S 5 0 3 Allen, Mr. William Henry male 35 0 0 373450 8.05 S 6 0 3 Moran, Mr. James male 0 0 330877 84.583 Q 7 0 1 McCarthy, Mr. Timothy J male 54 0 0 17463 518.625 E46 S 8 0 3 Palsson, Master. Gosta Leonard male 2 3 1 349909 21.075 S 9 1 3 Johnson, Mrs. Oscar W (Elisabeth Vilhelmina Berg) female 27 0 2 347742 111.333 S 10 1 2 Nasser, Mrs. Nicholas (Adele Achem) female 14 1 0 237736 300.708 C 11 1 3 Sandstrom, Miss. Marguerite Rut female 4 1 1 PP 9549 16.7 G6 S 12 1 1 Bonnell, Miss. Elizabeth female 58 0 0 113783 26.55 C103 S 13 0 3 Saundercock, Mr. William Henry male 20 0 0 A/5. 2151 8.05 S 14 0 3 Andersson, Mr. Anders Johan male 39 1 5 347082 31.275 S
- 6. “Could you take in account siblings?”
- 7. Sure…
- 8. “Oh and the number of parents and children aboard…”
- 9. Of course!
- 10. “Could you add a ‘simple if’ for age as well?”
- 12. “Great! We are almost there! But…”
- 14. “Field of study that gives computers the ability to learn without being explicitly programmed” Arthur Lee Samuel
- 18. Alright! Let's become data scientists!
- 20. A comparison Traditional programming Machine learning Input program Input output output programnew input new output
- 21. Classification vs regression Input Output 0.98 68 0 0.76 42 0 1.23 78 1 1.91 109 1 Input Output 0.98 68 0.23 0.76 42 0.15 1.23 78 4.74 1.91 109 7.98
- 22. Support Vector Machine • Automatically creates a “program” or model • Inputs are ‘features’ • Model represents a space • New input fits somewhere
- 26. Support Vectors • Optimal hyperplane • Linear classifier • Maximum margin • Classification
- 29. The kernel trick A whole new dimension
- 30. The kernel trick
- 31. Choosing a kernel • No kernel or linear kernel • Gaussian kernel • Polynomial kernel • Sigmoid kernel • Radial basis function kernel • …
- 32. Choosing a kernel Rule of thumb • N much bigger than M => linear kernel • N small, M intermediate => gaussian kernel N = number of features M = number of training examples
- 33. Spam detection • N = 10000 (bad words, # of urls,…) • M = 250 (sample mails) => linear kernel
- 34. Validation of housing prices • N = 1-1000 (# of rooms, m3, location,…) • M = 100,000 (of transactions) => Gaussian kernel
- 35. Features It’s all about preparation
- 36. Features • Representation of raw data • The hardest part Raw data Pre- processing Feature scaling Feature extraction
- 38. OCR – Pre-processing • De-skew
- 39. OCR – Pre-processing • De-skew • Despeckle
- 40. OCR – Pre-processing • De-skew • Despeckle • Convert to black & white
- 41. OCR – Pre-processing • De-skew • Despeckle • Convert to black & white • Zoning
- 42. OCR – Pre-processing • De-skew • Despeckle • Convert to black & white • Zoning • Character segmentation
- 43. OCR – Feature extraction
- 44. OCR – Feature scaling How to scale the number of black pixels? 22 / 56=> 0.39286 Scale between 0 - 1
- 45. Real life
- 46. OCR – Training the model Training file • Labels • Features Label % Black Pixels X1 % X2 % X3 % … 0 0.33 0.546 0.840 1 0.78 0.123 0.567 0.347 1 0.75 0.512 0.543
- 47. Alice in Wonderland Down the rabbit hole
- 48. • Avg word length • Char frequency • … Basic text features
- 49. • Avg word length • Char frequency • … Basic text features
- 52. Input “Thank you for contacting us. This is an automated response confirming the receipt of your ticket. Our team will get back to you as soon as possible. When replying, please make sure that the ticket ID is kept in the subject so that we can track your replies.” Testing the unknown
- 53. Input “Thank you for contacting us. This is an automated response confirming the receipt of your ticket. Our team will get back to you as soon as possible. When replying, please make sure that the ticket ID is kept in the subject so that we can track your replies.” Output This is an English text Testing the unknown
- 54. Input “Hierbij bevestigen wij de ontvangst en verwerking van uw e-mail met ticketnummer PCL-98124-735. Uw vraag wordt opgepakt door één van onze engineers. Wij streven ernaar spoedig een oplossing aan u terug te kunnen koppelen. “ Testing the unknown
- 55. Input “Hierbij bevestigen wij de ontvangst en verwerking van uw e-mail met ticketnummer PCL-98124-735. Uw vraag wordt opgepakt door één van onze engineers. Wij streven ernaar spoedig een oplossing aan u terug te kunnen koppelen. “ Output This is a Dutch text Testing the unknown
- 56. Titanic The chance of survival
- 57. PassengerId Survived Pclass Name Sex Age SibSp Parch Ticket Fare Cabin Embarked 1 0 3 Braund, Mr. Owen Harris male 22 1 0 A/5 21171 7.25 S 2 1 1 Cumings, Mrs. John Bradley (Florence Briggs Thayer) female 38 1 0 PC 17599 712.833 C85 C 3 1 3 Heikkinen, Miss. Laina female 26 0 0 STON/O2. 3101282 7.925 S 4 1 1 Futrelle, Mrs. Jacques Heath (Lily May Peel) female 35 1 0 113803 53.1 C123 S 5 0 3 Allen, Mr. William Henry male 35 0 0 373450 8.05 S 6 0 3 Moran, Mr. James male 0 0 330877 84.583 Q 7 0 1 McCarthy, Mr. Timothy J male 54 0 0 17463 518.625 E46 S 8 0 3 Palsson, Master. Gosta Leonard male 2 3 1 349909 21.075 S 9 1 3 Johnson, Mrs. Oscar W (Elisabeth Vilhelmina Berg) female 27 0 2 347742 111.333 S 10 1 2 Nasser, Mrs. Nicholas (Adele Achem) female 14 1 0 237736 300.708 C 11 1 3 Sandstrom, Miss. Marguerite Rut female 4 1 1 PP 9549 16.7 G6 S 12 1 1 Bonnell, Miss. Elizabeth female 58 0 0 113783 26.55 C103 S 13 0 3 Saundercock, Mr. William Henry male 20 0 0 A/5. 2151 8.05 S 14 0 3 Andersson, Mr. Anders Johan male 39 1 5 347082 31.275 S
- 61. Feature extraction • Title (Mrs, Miss, Mr, Jonkheer, Capt,..) • Passengerclass • Sex • Age • Siblings/spouses • Parent/children • Cabin • Port of embarkation
- 69. Common issues • Feature numbering • Training data <> real world • Overfitting • Feature selection • Multiclass classification
- 70. Next step?
- 76. Resources • https://www.csie.ntu.edu.tw/~cjlin/libsvm/ • http://php.net/manual/en/book.svm.php • https://www.kaggle.com/ • http://scikit-learn.org/stable/ • https://packagist.org/packages/sjoerdmaessen/machinelearning