"sampler" is currently a keyword argument #1
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The example provided specifies the sampler option as if it would be positional, but it is actually a keyword argument. I don't understand the "*" or the possibility of the sampler to be None. But in order to make it work without removing those, the sampler hast to be especified as "sampler"=sampler.
Summary
Just updated the example provided in the docstring.
Details and comments