定义集合通信reduce操作的类型。
typedef enum { HCCL_REDUCE_SUM = 0, /**< sum */ HCCL_REDUCE_PROD = 1, /**< prod */ HCCL_REDUCE_MAX = 2, /**< max */ HCCL_REDUCE_MIN = 3, /**< min */ HCCL_REDUCE_RESERVED /**< reserved */ } HcclReduceOp;