Machine learning (supervised)

cannot perform proper standard scaling after spliting datas in linear,logistic regression and in decision tree making
though following proper steps from mr. kushal sir!please help to solve this problem

request for proper c.s.v file for supervised learning

Hello sir i am new here i am facing problem i am taking class machine learning and i installed mlxtend Liabary but mlxtend libary not able to install there is no module named is this type of interface showing while i calling Liabary