Tf1 Course 2 Week1Programing assignment files

Am having trouble with the “split_data” section of the Course2 Week 1 programing assignment. Can not find where this subject/example was covered in this or previous courses. Can someone please point me to a lesson or example where this is explained? Thanks. Mike
BTW, I am not an experienced coder so please speak slowly!

Please see this link.

Hello Michael ! I am in course 2 week 1 neural network and programming assignment but there’s error shown that lab timed out. can you help me with this ,however the deadline for assignment is 2nd April 2023.