/**
 * Copyright 2019-2020 Huawei Technologies Co., Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef GE_OP_HCOM_OPS_H_
#define GE_OP_HCOM_OPS_H_

#include "graph/operator_reg.h"

namespace ge {
/**
 * @brief Outputs a tensor gathering all input tensors.
 * @par Inputs:
 * x: A tensor. Must be one of the following types: int8, int32, float16, 
 * float32.
 * @par Attributes:
 * @li rank_size: An integer identifying the number of ranks participating in 
 * the op.
 * @li group: A string identifying the group name of ranks participating in 
 * the op.
 * @par Outputs:
 * y: A Tensor. Has the same type as "x".
 * @attention Constraints:\n
 * "group" is limited to 128 characters. Use "hccl_world_group" 
 * as the name of a world group.
 */
REG_OP(HcomAllGather)
    .INPUT(x, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .OUTPUT(y, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .REQUIRED_ATTR(rank_size, Int)
    .REQUIRED_ATTR(group, String)
    .ATTR(alpha, Float, 1.0)
    .ATTR(beta, Float, 0.0)
    .OP_END_FACTORY_REG(HcomAllGather)

/**
 * @brief Outputs a tensor containing the reduction across all input tensors 
 * passed to op.
 * @par Inputs:
 * x: A tensor. Must be one of the following types: int8, int32, float16, 
 * float32.
 * @par Attributes:
 * @li reduction: A string identifying the reduction operation to perform. \n
 * The supported operation are: "sum", "max", "min", "prod".
 * @li group: A string identifying the group name of ranks participating in 
 * the op.
 * @li fusion: An optional integer identifying the fusion flag of the op. \n
 * 0: no fusion; other (default): fusion.
 * @par Outputs:
 * y: A Tensor. Has the same type as "x".
 * @attention Constraints: \n
 * "group" is limited to 128 characters. Use "hccl_world_group" 
 * as the name of a world group.
 */
REG_OP(HcomAllReduce)
    .INPUT(x, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .OUTPUT(y, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .REQUIRED_ATTR(reduction, String)
    .REQUIRED_ATTR(group, String)
    .ATTR(fusion, Int, 1)
    .ATTR(alpha, Float, 1.0)
    .ATTR(beta, Float, 0.0)
    .OP_END_FACTORY_REG(HcomAllReduce)

/**
 * @brief Broadcasts the input tensor in root rank to all ranks.
 * @par Inputs:
 * x: A tensor. Must be one of the following types: int8, int32, float16, 
 * float32.
 * @par Attributes:
 * @li root_rank: An integer identifying the root rank in the op input of 
 * this rank will be broadcast to other ranks.
 * @li group: A string identifying the group name of ranks participating in 
 * the op.
 * @par Outputs:
 * y: A Tensor. Has the same type as "x".
 * @attention Constraints:\n
 * "group" is limited to 128 characters. Use "hccl_world_group" 
 * as the name of a world group.
 */
REG_OP(HcomBroadcast)
    .DYNAMIC_INPUT(x, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .DYNAMIC_OUTPUT(y, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .REQUIRED_ATTR(root_rank, Int)
    .REQUIRED_ATTR(group, String)
    .ATTR(alpha, Float, 1.0)
    .ATTR(beta, Float, 0.0)
    .OP_END_FACTORY_REG(HcomBroadcast)

/**
 * @brief Performs reduction across all input tensors, scattering in equal 
 * blocks among ranks, each rank getting a chunk of data based on its rank 
 * index.
 * @par Inputs:
 * x: A tensor. Must be one of the following types: int8, int32, float16, 
 * float32.
 * @par Attributes:
 * @li reduction: A string identifying the reduction operation to perform. \n
 * The supported operation are: "sum", "max", "min", "prod".
 * @li group: A string identifying the group name of ranks participating in 
 * the op.
 * @li rank_size: An integer identifying the number of ranks participating in 
 * the op.
 * @par Outputs:
 * y: A Tensor. Has the same type as "x".
 * @attention Constraints:\n
 * "group" is limited to 128 characters. Use "hccl_world_group" 
 * as the name of a world group.
 */
REG_OP(HcomReduceScatter)
    .INPUT(x, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .OUTPUT(y, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .REQUIRED_ATTR(reduction, String)
    .REQUIRED_ATTR(group, String)
    .REQUIRED_ATTR(rank_size, Int)
    .ATTR(alpha, Float, 1.0)
    .ATTR(beta, Float, 0.0)
    .OP_END_FACTORY_REG(HcomReduceScatter)

/**
 * @brief Sends the input tensor to destination rank.
 * @par Inputs:
 * x: A tensor. Must be one of the following types: int8, int32, float16, 
 * float32.
 * @par Attributes:
 * @li sr_tag: An integer identifying the send/recv message tag. The message 
 * will be received by the HcomReceive op with the same "sr_tag".
 * @li dest_rank: An integer identifying the destination rank.
 * @li group: A string identifying the group name of ranks participating in 
 * the op.
 * @par Outputs:
 * None.
 * @attention Constraints:\n
 * @li "group" is limited to 128 characters. Use 
 * "hccl_world_group" as the name of a world group.
 * @li Operators HcomSend and HcomReceive have the same "sr_tag".
 * @see HcomReceive
*/
REG_OP(HcomSend)
    .INPUT(x, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .REQUIRED_ATTR(group, String)
    .REQUIRED_ATTR(sr_tag, Int)
    .REQUIRED_ATTR(dest_rank, Int)
    .ATTR(alpha, Float, 1.0)
    .ATTR(beta, Float, 0.0)
    .OP_END_FACTORY_REG(HcomSend)

/**
 * @brief Receives the tensor from source rank.
 * @par Inputs:
 * None.
 * @par Attributes:
 * @li sr_tag: An integer identifying the send/recv message tag. The message 
 * will be send by the HcomSend op with the same "sr_tag".
 * @li src_rank: An integer identifying the source rank.
 * @li group: A string identifying the group name of ranks participating in 
 * the op.
 * @li shape: A list identifying the shape of the tensor to be received.
 * @li dtype: An integer identifying the type of the tensor to be received. \n
 * The supported types are: int8, int32, float16, float32.
 * @par Outputs:
 * y: A tensor with type identified in "dtype".
 * @attention Constraints:\n
 * @li "group" is limited to 128 characters. Use 
 * "hccl_world_group" as the name of a world group.
 * @li Operators HcomSend and HcomReceive have the same "sr_tag".
 * @li "shape" should be same as the input tensor of HcomSend.
 * @li "dtype" should be same as the input tensor of HcomSend.
 * @see HcomSend
*/
REG_OP(HcomReceive)
    .OUTPUT(y, TensorType({DT_FLOAT, DT_INT32, DT_INT8, DT_FLOAT16}))
    .REQUIRED_ATTR(group, String)
    .REQUIRED_ATTR(sr_tag, Int)
    .REQUIRED_ATTR(src_rank, Int)
    .REQUIRED_ATTR(shape, ListInt)
    .REQUIRED_ATTR(dtype, Type)
    .ATTR(alpha, Float, 1.0)
    .ATTR(beta, Float, 0.0)
    .OP_END_FACTORY_REG(HcomReceive)

}
#endif