TAB gives me help about Python etc functions but not about fast.ai ones

good day,
Im using Google colab,
problem is using TAB gives me help about python functions, all good,
but when I use it with a fast.ai function it doesnt work, nothing happens when I do it inside a fast.ai function

and there are even some functions like
?random_split_by_pct

which return error when using ?

Object random_split_by_pct not found.

ok in that case I needed to do
?ImageItemList.random_split_by_pct

and then it works

but basically using

?.. in a separate cell is the only way I find,
the TAB never works for me with fast.ai functions, only for autocompleting, not for help

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