What is cost function in gradient descent?

Related questions

1. What is cost function in linear regression?
2. What materials can be annealed?
3. What is gradient descent in linear regression?
4. What controls the magnitude of a step taken during gradient descent?
5. What is vanilla gradient descent?
6. Why do gradients vanish?
7. Can cost function be negative?
8. What is the physical significance of gradient?
9. How do you interpret a gradient?
10. What is the difference between linear regression and least square?

Tags

1. #example
2. #minimum
3. #training
4. #function
5. #method
6. #gradient
7. #variables
8. #squared
9. #multiple
10. #descent
11. #minimize
12. #might
13. #errors
14. #something
15. #finding