指定规约操作的类型,必须是下述值之一:
ReduceOp.SUM ReduceOp.MAX ReduceOp.MIN ReduceOp.PROD
ReduceOp.SUM
ReduceOp.MAX
ReduceOp.MIN
ReduceOp.PROD
COPY-FROM: paddle.distributed.ReduceOp