Why do we need feature extraction?

Related questions

1. Is Random Forest probabilistic?
2. When would you use random forests vs SVM and why?
3. How does random forest work?
4. How does random forest achieve feature importance?
5. How do you select features in machine learning?
6. How do you determine variable importance?
7. How is feature importance calculated in random forest?
8. Why is correlation important in machine learning?
9. What is random forest feature importance?
10. What is feature selection in data mining?

Tags

1. #essential
2. #these
3. #recognition
4. #extract
5. #pattern
6. #interest
7. #machine
8. #dataset
9. #processing
10. #feature
11. #original
12. #extraction
13. #general
14. #informative
15. #tasks
16. #features
17. #learning
18. #desired
19. #properties
20. #respect