For example I remember that I need train_test_split function from sklearn module, but I don't remember I need to use from sklearn.model_selection import train_test_split for import, I've tried to use help() in interactive mode with no results for train_test_split string:
import sklearn
help() # then type 'train_test_split' in interactive mode
do I need load each submodule and search pattern there ?
 
    