Customise tournament selection operator

[alfcan]

Hello,

as I use the framework using a custom individual, I wanted to understand how to use the tournament selection operator and whether it needs to be customised in any way.
I ask this because when I use the standard torunament selection operator, with the command 'selection=get_selection('tournament')' I get the following error:
Traceback (most recent call last):
File "C:\Users\GA-for-ML\genetic_algorithm_init_.py", line 21, in
selection=get_selection('tournament'),
File "C:\Users\GA-for-ML\venv\lib\site-packages\pymoo\factory.py", line 134, in get_selection
return get_from_list(get_selection_options(), name, args, {**d, **kwargs})
File "C:\Users\GA-for-ML\venv\lib\site-packages\pymoo\factory.py", line 41, in get_from_list
return clazz(*args, **kwargs)
File "C:\Users\GA-for-ML\venv\lib\site-packages\pymoo\operators\selection\tournament.py", line 33, in init
raise Exception("Please provide the comparing function for the tournament selection!")
Exception: Please provide the comparing function for the tournament selection!