I do not understand these codes on multiple variable optional lab

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
1

I do not understand these points on this code:

  1. Save cost J at each iteration

  2. Print cost every at intervals 10 times or as many iterations if < 10

  3. print(f"Iteration {i:4d}: Cost {J_history[-1]:8.2f} ") what is this code .2f

lab 2
lab 21203×810 43.3 KB

2

It prints the current iteration as a 4-digit integer, and the most recent value from the cost history formatted as an 8-digit floating point value with two decimal places.

4

Ok thank u