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A sum() method is a reduction operation for adding together all elements
of a distributed array. It has two prototypes
where the variable runs over all primitive types other than boolean,
and the notation
# means a multiarray of arbitrary rank,
with elements of type .
The second form takes an extra boolean array aligned with the source array
and ignores all elements of source for which the corresponding element of
mask is false.
The sum method is implemented by a schedule object with HPspmd
Each primitive types other than boolean has its own schedule class.
This class has two constructors with arguments identical to the method above,
and has one public method with no arguments called execute(),
which executes the schedule.
The effective public interface of the Sum class is
The source array is source.
It will have elements of type . The mask array is mask.