How to rename task in visualized graph?

when writing code like x = delayed(calc_avg)(a,b)

the function name calc_avg is used in visualized graph.
is there a way to display a different name in visualized graph?

I tried x = delayed(calc_avg, name='different')(a ,b), but calc_avg is still used in visualized graph. in the doc, it says the name argument used for underlying graph. what does it really mean?