The functions in this section perform a global reduce operation
(for example sum, maximum, and logical and) across
all members of a group.
The reduction operation can be either one of a predefined list of
operations, or a user-defined operation.
The global reduction functions come in several flavors: a reduce that
returns the result of the reduction
to one member of a group,
an all-reduce that
returns this result
to all members of a group,
scan (parallel prefix)
In addition, a reduce-scatter operation combines the
functionality of a reduce and of a scatter operation.
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