BUG: sparse: Use _ascontainer for argmin/argmax #18121
Merged
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Reference issue
Fixes gh-18111
What does this implement/fix?
The current implementation of sparse arrays relies on the use of
_container
and_ascontainer
classmethods to dispatch to the correct output type when returning dense results. In this case, we'd overlooked a callsite that was unconditionally invokingnp.matrix
.