role_maker.py

#   Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
#
# 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.
"""Defination of Role Makers."""
import os
import time
import numpy as np
import warnings
from multiprocessing import Process, Manager

import paddle.fluid as fluid


class Role:
    WORKER = 1
    SERVER = 2
    HETER_WORKER = 3
    ALL = 4


class Gloo(object):
    """
    Gloo is a universal class for barrier and collective communication
    """

    class RENDEZVOUS:
        HDFS = 1
        FILE = 2
        HTTP = 3

    def __init__(self):
        self._worker_comm = None
        self._server_comm = None
        self._nodes_comm = None

        self._comm_world = ["worker", "server", "all"]
        self._err_init = "gloo is not initialized, will not communicator with other nodes"
        self._err_type = "gloo initialized error, please check arguments"
        self._err_world = "argument error, comm_world must in {}".format(
            self._comm_world)

        self._is_initialized = False
        self._init_timeout_seconds = 3600
        self._run_timeout_seconds = 9999999

        self._rendezvous = None
        self._role = None
        self._iface = None

        self._role_id = -1
        self._worker_num = -1
        self._server_num = -1
        self._need_init_all = False

    def init(self,
             rendezvous,
             role,
             role_id,
             worker_num,
             server_num,
             need_init_all=False,
             kwargs=None):

        self._rendezvous = rendezvous
        self._role = role
        self._role_id = role_id
        self._worker_num = worker_num
        self._server_num = server_num
        self._need_init_all = need_init_all
        self._iface = self.__get_default_iface()
        self._prefix = kwargs.get("store.prefix", "")

        if self._rendezvous == Gloo.RENDEZVOUS.HDFS:
            dfs_name = kwargs.get("dfs.name", "")
            dfs_ugi = kwargs.get("dfs.ugi", "")
            dfs_path = kwargs.get("dfs.path", "")

            if not dfs_name or not dfs_ugi or not dfs_path:
                raise ValueError(self._err_type)
            self._init_dfs(dfs_name, dfs_ugi, dfs_path, self._prefix)

        elif self._rendezvous == Gloo.RENDEZVOUS.FILE:
            fs_path = kwargs.get("dfs.path", "")

            if not fs_path:
                raise ValueError(self._err_type)
            self._init_fs(fs_path, self._prefix)

        elif self._rendezvous == Gloo.RENDEZVOUS.HTTP:
            ip = kwargs.get("http.host", "")
            port = kwargs.get("http.port", "")

            if not ip or not port:
                raise ValueError(self._err_type)
            self._init_http(ip, port, self._prefix)

        else:
            raise ValueError(self._err_type)

        self._is_initialized = True

    def _init_fs(self, fs_path, prefix):
        def init(rank, nodes, role):
            gloo = fluid.core.Gloo()
            gloo.set_rank(rank)
            gloo.set_size(nodes)
            gloo.set_prefix(prefix)
            gloo.set_iface(self._iface)
            gloo.set_timeout_seconds(self._init_timeout_seconds,
                                     self._run_timeout_seconds)
            gloo.set_hdfs_store(os.path.join(fs_path, role), "", "")
            gloo.init()
            return gloo

        if self._role == Role.WORKER:
            rank, nodes = self._get_rank_nodes(Role.WORKER)
            gloo = init(rank, nodes, "WORKER")
            self._worker_comm = gloo
        else:
            rank, nodes = self._get_rank_nodes(Role.SERVER)
            gloo = init(rank, nodes, "SERVER")
            self._server_comm = gloo

        if self._need_init_all:
            rank, nodes = self._get_rank_nodes(Role.ALL)
            gloo = init(rank, nodes, "ALL")
            self._nodes_comm = gloo

    def _init_dfs(self, dfs_name, dfs_ugi, dfs_path, prefix):
        def init(rank, nodes, role):
            gloo = fluid.core.Gloo()
            gloo.set_rank(rank)
            gloo.set_size(nodes)
            gloo.set_prefix(prefix)
            gloo.set_iface(self._iface)
            gloo.set_timeout_seconds(self._init_timeout_seconds,
                                     self._run_timeout_seconds)
            gloo.set_hdfs_store(os.path.join(dfs_path, role), dfs_name, dfs_ugi)
            gloo.init()
            return gloo

        if self._role == Role.WORKER:
            rank, nodes = self._get_rank_nodes(Role.WORKER)
            gloo = init(rank, nodes, "WORKER")
            self._worker_comm = gloo
        else:
            rank, nodes = self._get_rank_nodes(Role.SERVER)
            gloo = init(rank, nodes, "SERVER")
            self._server_comm = gloo

        if self._need_init_all:
            rank, nodes = self._get_rank_nodes(Role.ALL)
            gloo = init(rank, nodes, "ALL")
            self._nodes_comm = gloo

    def _init_http(self, ip, port, prefix):
        def __start_kv_server(http_server_d, size_d):
            from paddle.distributed.fleet.utils.http_server import KVServer
            http_server = KVServer(port, size_d)
            http_server.start()
            wait_seconds = 5
            while http_server_d.get("running",
                                    False) and not http_server.shoud_stop():
                time.sleep(wait_seconds)
            http_server.stop()

        def init_kv_server():
            size_d = {
                "trainer": self._worker_num,
                "pserver": self._server_num,
                "all": self._worker_num + self._server_num
            }

            _http_server_d = {"running": True}
            # child process for http server
            _http_server = Process(
                target=__start_kv_server, args=(_http_server_d, size_d))
            _http_server.daemon = True
            # set running status to True
            # start child process
            _http_server.start()

        def init(rank, nodes, role):
            gloo = fluid.core.Gloo()
            gloo.set_rank(rank)
            gloo.set_size(nodes)
            gloo.set_prefix(prefix)
            gloo.set_iface(self._iface)
            gloo.set_timeout_seconds(self._init_timeout_seconds,
                                     self._run_timeout_seconds)
            gloo.set_http_store(ip, port, role)
            return gloo

        port = int(port)

        if self._role == Role.SERVER and self._role_id == 0:
            init_kv_server()

        if self._role == Role.WORKER:
            rank, nodes = self._get_rank_nodes(Role.WORKER)
            gloo = init(rank, nodes, "WORKER")
            self._worker_comm = gloo
        else:
            rank, nodes = self._get_rank_nodes(Role.SERVER)
            gloo = init(rank, nodes, "SERVER")
            self._server_comm = gloo

        if self._need_init_all:
            rank, nodes = self._get_rank_nodes(Role.ALL)
            gloo = init(rank, nodes, "ALL")
            self._nodes_comm = gloo

    def _get_rank_nodes(self, role):
        nodes = 0
        rank = -1

        if role == Role.WORKER:
            nodes = self._worker_num
            rank = self._role_id
        elif role == Role.SERVER:
            nodes = self._server_num
            rank = self._role_id
        elif role == Role.ALL:
            nodes = self._worker_num + self._server_num

            if self._role == Role.WORKER:
                rank = self._role_id
            else:
                rank = self._worker_num + self._role_id
        else:
            ValueError(self._err_type)

        return rank, nodes

    def __get_default_iface(self):
        """
        get default physical interface
        """
        default1 = self.__get_default_iface_from_gateway()
        default2 = self.__get_default_iface_from_interfaces()
        return default2 if default1 == "lo" else default1

    def __get_default_iface_from_gateway(self):
        """
        get default physical interface
        """
        res = os.popen("route -A inet").read().strip().split("\n")

        gateway_idx = None
        iface_idx = None
        for item in res:
            item = item.split()
            if "Gateway" in item and "Iface" in item:
                gateway_idx = item.index("Gateway")
                iface_idx = item.index("Iface")
            elif gateway_idx != None and iface_idx != None:
                gateway = None
                if len(item) > gateway_idx:
                    gateway = item[gateway_idx]
                if gateway and gateway != '*' and gateway != "0.0.0.0" and len(
                        item) > iface_idx:
                    return item[iface_idx]
        return "lo"

    def __get_default_iface_from_interfaces(self):
        """
        get default physical interface
        """
        res = os.popen("ip -f inet addr | awk NR%3==1").read().strip().split(
            "\n")
        for item in res:
            if "BROADCAST" in item:
                return item.split(":")[1].strip()
        return "lo"

    def barrier(self, comm_world):
        """
        dummy barrier, do nothing
        """
        if not self._is_initialized:
            warnings.warn(self._err_init)
            return

        if comm_world not in self._comm_world:
            raise ValueError(self._err_world)

        if comm_world == "worker":
            self._worker_comm.barrier()
        elif comm_world == "server":
            self._server_comm.barrier()
        else:
            self._nodes_comm.barrier()

    def all_reduce(self, input, mode="sum", comm_world="worker"):
        if not self._is_initialized:
            warnings.warn(self._err_init)
            return input

        if comm_world not in self._comm_world:
            raise ValueError(self._err_world)

        input = np.array(input)
        input_shape = input.shape
        input_list = input.reshape(-1).tolist()

        self.barrier(comm_world)

        if comm_world == "worker":
            ans = self._worker_comm.all_reduce(input_list, mode)
        elif comm_world == "server":
            ans = self._server_comm.all_reduce(input_list, mode)
        else:
            ans = self._nodes_comm.all_reduce(input_list, mode)

        output = np.array(ans).reshape(input_shape)
        return output

    def all_gather(self, input, comm_world="worker"):
        """
        dummy all gather, do nothing
        Args:
            obj(any): obj to do all gather
        """
        if not self._is_initialized:
            warnings.warn(self._err_init)
            return input

        if comm_world not in self._comm_world:
            raise ValueError(self._err_world)

        if comm_world == "worker":
            output = self._worker_comm.all_gather(input)
        elif comm_world == "server":
            output = self._server_comm.all_gather(input)
        else:
            output = self._nodes_comm.all_gather(input)

        return output


class RoleMakerBase(object):
    """
    RoleMakerBase is a base class for assigning a role to current process
    in distributed training.
    A paddle developer can implement RoleMakerBase to design a role maker
    for worker or pserver assignment.
    """

    def __init__(self):
        self._worker_endpoints = []
        self._server_endpoints = []
        self._role_is_generated = False
        self._role = None
        self._current_id = -1

        # for heter parameter server mode
        self._heter_trainer_endpoints = []
        self._heter_trainer_device = "CPU"
        self._is_heter_parameter_server_mode = False

    def _is_worker(self):
        """
        return is_worker() of current process
        """
        raise NotImplementedError("Please implement this method in child class")

    def _is_server(self):
        """
        return is_server() of current process
        """
        raise NotImplementedError("Please implement this method in child class")

    def _is_first_worker(self):
        """
        Check whether the node is the first instance of worker.
        Returns:
            bool: True if this is the first node of worker,
                  False if not.
        """
        raise NotImplementedError("Please implement this method in child class")

    def _worker_num(self):
        """
        Get current total worker number.

        Returns:
            int: worker number
        """
        raise NotImplementedError("Please implement this method in child class")

    def _server_num(self):
        """
        Get current total server number.

        Returns:
            int: server number
        """
        raise NotImplementedError("Please implement this method in child class")

    def _worker_index(self):
        """
        Get current worker id.

        Returns:
            int: node id
        """
        raise NotImplementedError("Please implement this method in child class")

    def _server_index(self):
        """
        Get current server id.

        Returns:
            int: node id
        """
        raise NotImplementedError("Please implement this method in child class")

    def _role_id(self):
        """
        Get current id.

        Returns:
            int: node id
        """
        raise NotImplementedError("Please implement this method in child class")

    def _node_num(self):
        """
        Get the training node number
        Returns:
            int: node num
        """
        raise NotImplementedError("Please implement this method in child class")

    def _get_trainer_endpoints(self):
        """
        return trainer endpoints
        """
        return self._worker_endpoints

    def _get_pserver_endpoints(self):
        """
        return pserver endpoints
        """
        return self._server_endpoints

    def to_string(self):
        return "role: {}, current_id: {}, worker_endpoints: {}, server_endpoints: {}".format(
            self._role, self._current_id, self._worker_endpoints,
            self._server_endpoints)

    def _all_gather(self, input, comm_world="worker"):
        print("warning: RoleMakerBase does not have all gather worker.")
        return None

    def _all_reduce(self, input, mode="sum", comm_world="worker"):
        """
        Args:
            input(list/numpy.array): array of one dim
            output(list/numpy.array): array of one dim
            mode(str): "sum" or "min" or "max"
        """
        print("warning: RoleMakerBase does not have all reduce worker.")
        return None

    def _barrier(self, comm_world):
        """
        barrier between trainers if current role is TRAINER
        """
        print("warning: RoleMakerBase does not have barrier worker.")

    def _is_heter_worker(self):
        """
        Return is_heter_worker() of current process
        """
        warnings.warn("RoleMakerBase does not have function: _is_heter_worker.")
        return False

    def _heter_worker_num(self):
        """
        Get current total heter-worker number.

        Returns:
            int: heter_worker number
        """
        warnings.warn(
            "RoleMakerBase does not have function: _heter_worker_num.")
        return 0

    def _get_heter_worker_endpoints(self):
        """
        Returns:
            string: all heter_trainers'endpoints
        """
        assert self._heter_trainer_endpoints != [], "Heter Worker Endpoints Not initialized"
        return self._heter_trainer_endpoints

    def _get_heter_worker_endpoint(self):
        """
        Returns:
            int: corresponding heter_trainer's endpoint

        e.g: if we have 4 cpu-trainer(default), 2 gpu-trainer(heter)
             then No.0 and No.2 cpu-trainer will work with No.0 gpu-trainer
             and No.1 and No.3 cpu-trainer will work with No.1 gpu-trainer
        """
        assert self._heter_trainer_endpoints != [], "Heter Worker Endpoints Not initialized"
        return self._heter_trainer_endpoints[(self._current_id) %
                                             self._heter_worker_num()]

    def _get_heter_worker_device(self):
        """
        Returns:
            string: heter_trainer's device of current node, e.g: CPU/GPU/XPU
        """
        return self._heter_trainer_device.upper()


class PaddleCloudRoleMaker(RoleMakerBase):
    def __init__(self, is_collective=False, **kwargs):
        super(PaddleCloudRoleMaker, self).__init__()
        self._is_collective = is_collective

        self._non_distributed = False

        self._kwargs = kwargs
        self._role_is_generated = False

        self._server_endpoints = None
        self._worker_endpoints = None

        self._gloo = Gloo()  # gloo instance

    def _barrier(self, comm_world):
        self._gloo.barrier(comm_world)

    def _all_gather(self, input, comm_world="worker"):
        return self._gloo.all_gather(input, comm_world)

    def _all_reduce(self, input, mode="sum", comm_world="worker"):
        return self._gloo.all_reduce(input, mode, comm_world)

    def _is_worker(self):
        """
        whether current process is worker
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._role == Role.WORKER

    def _is_server(self):
        """
        whether current process is server
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._role == Role.SERVER

    def _is_first_worker(self):
        """
        whether current process is worker of rank 0
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._role == Role.WORKER and self._current_id == 0

    def _worker_index(self):
        """
        get index of current worker
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._current_id

    def _server_index(self):
        """
        get index of current server
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._current_id

    def _role_id(self):
        """
        get index of current node
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._current_id

    def _worker_num(self):
        """
        retrun the current number of worker
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._trainers_num

    def _server_num(self):
        """
        return the current number of server
        """
        if not self._role_is_generated:
            self._generate_role()
        return len(self._get_pserver_endpoints(
        )) if self._get_pserver_endpoints() is not None else 0

    def _node_num(self):
        """
        return the training node number
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._nodes_num

    def _get_trainer_endpoints(self):
        """
        get endpoint of all trainers
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._worker_endpoints

    def _get_pserver_endpoints(self):
        """
        get endpoint of all pservers
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._server_endpoints

    def _is_non_distributed(self):
        """
        Return True if indispensable environment for fleetrun is not found
        (use python-run to launch fleet-code directly)
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._non_distributed

    def _heter_worker_num(self):
        """
        get heter worker nums
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._heter_trainers_num

    def _is_heter_worker(self):
        """
        whether current process is heter worker
        """
        if not self._role_is_generated:
            self._generate_role()
        return self._role == Role.HETER_WORKER

    def _ps_env(self):
        try:
            # Environment variable PADDLE_PSERVERS_IP_PORT_LIST must be set
            # format: string(ip:port,ip:port), eg. 127.0.0.1:6001,127.0.0.1:6002
            self._server_endpoints = os.getenv("PADDLE_PSERVERS_IP_PORT_LIST")

            if self._server_endpoints is None:
                # back to non_distributed execution.
                self._server_endpoints = ""
                self._trainers_num = 1
                self._role = Role.WORKER
                self._current_id = 0
                self._nodes_num = 1
                self._heter_trainers_num = 0
                self._heter_trainer_endpoints = None
                self._non_distributed = True
                return

            self._server_endpoints = self._server_endpoints.split(",")

            self._worker_endpoints = os.getenv("PADDLE_TRAINER_ENDPOINTS")
            if self._worker_endpoints:
                self._worker_endpoints = self._worker_endpoints.split(",")
            else:
                self._worker_endpoints = []

            trainers_num = int(os.environ["PADDLE_TRAINERS_NUM"])
            training_role = os.environ["TRAINING_ROLE"]

            if training_role not in ["TRAINER", "PSERVER", "HETER_TRAINER"]:
                raise ValueError(
                    "TRAINING_ROLE must be PSERVER or TRAINER or HETER_TRAINER, but get {}, please check your environment.".
                    format(training_role))

            # For heter parameter server env setting
            heter_trainer_eplist = os.getenv(
                "PADDLE_HETER_TRAINER_IP_PORT_LIST", None)
            heter_trainer_device = os.getenv("PADDLE_HETER_TRAINER_DEVICE",
                                             None)
            if heter_trainer_eplist and heter_trainer_device:
                try:
                    heter_trainer_eplist = os.environ[
                        "PADDLE_HETER_TRAINER_IP_PORT_LIST"].split(",")
                except:
                    raise ValueError(
                        "Can not Find PADDLE_HETER_TRAINER_IP_PORT_LIST in env or its format doesn't match the requirement: 'IP:PORT,IP:PORT' ."
                    )

                self._is_heter_parameter_server_mode = True
                heter_trainers_num = len(heter_trainer_eplist)
                current_node_device = heter_trainer_device.upper()
                if current_node_device not in ["CPU", "GPU", "XPU"]:
                    raise ValueError(
                        "Heter Trainer doesn't support {} device now, please use CPU / GPU / XPU(KunLun)".
                        format(heter_trainer_device))
                self._heter_trainer_device = current_node_device
            else:
                self._is_heter_parameter_server_mode = False
                heter_trainers_num = 0

            if training_role == "TRAINER":
                role = Role.WORKER
                current_id = int(os.environ["PADDLE_TRAINER_ID"])
                if len(self._worker_endpoints) > 0:
                    self._cur_endpoint = self._worker_endpoints[current_id]
            elif training_role == "PSERVER":
                role = Role.SERVER
                port = os.environ["PADDLE_PORT"]
                ip = os.environ["POD_IP"]
                self._cur_endpoint = ip + ":" + port
                current_id = self._server_endpoints.index(self._cur_endpoint)
            elif training_role == "HETER_TRAINER":
                role = Role.HETER_WORKER
                cur_ip = os.environ["POD_IP"]
                cur_port = os.environ["PADDLE_PORT"]
                curr_endpoint = ":".join([cur_ip, cur_port])
                current_id = heter_trainer_eplist.index(curr_endpoint)
            else:
                raise ValueError(
                    "TRAINING_ROLE must be PSERVER or TRAINER or HETER_TRAINER")
        except ValueError as e:
            raise ValueError(
                "Something wrong with PaddleCloud, please check environment")

        self._trainers_num = trainers_num
        self._role = role
        self._current_id = current_id
        self._nodes_num = len(
            set([x.split(':')[0] for x in self._worker_endpoints]))
        self._heter_trainers_num = heter_trainers_num
        self._heter_trainer_endpoints = heter_trainer_eplist

    def _collective_env(self):
        self._current_id = int(os.getenv("PADDLE_TRAINER_ID", "0"))
        self._training_role = os.getenv("PADDLE_TRAINING_ROLE", "TRAINER")
        assert (self._training_role == "TRAINER")
        self._role = Role.WORKER
        self._worker_endpoints = os.getenv("PADDLE_TRAINER_ENDPOINTS")
        self._cur_endpoint = os.getenv("PADDLE_CURRENT_ENDPOINT")
        if self._worker_endpoints is None:
            # back to non_distributed execution.
            self._worker_endpoints = "127.0.0.1:6170"
            self._cur_endpoint = self._worker_endpoints
            self._non_distributed = True
        self._worker_endpoints = self._worker_endpoints.split(",")
        self._trainers_num = len(self._worker_endpoints)
        self._nodes_num = len(
            set([x.split(':')[0] for x in self._worker_endpoints]))

    def _gloo_init(self):
        # PADDLE_WITH_GLOO 1: trainer barrier, 2: all barrier
        use_gloo = int(os.getenv("PADDLE_WITH_GLOO", "0"))
        if use_gloo not in [1, 2]:
            return

        # PADDLE_GLOO_RENDEZVOUS 1: HDFS 2: FILE 3: HTTP
        rendezvous_type = int(os.getenv("PADDLE_GLOO_RENDEZVOUS", "0"))
        prefix = os.getenv("SYS_JOB_ID", "")
        if rendezvous_type not in [
                Gloo.RENDEZVOUS.HDFS, Gloo.RENDEZVOUS.HTTP, Gloo.RENDEZVOUS.FILE
        ]:
            raise ValueError(self._gloo._err_type)

        need_init_all = True if use_gloo == 2 else False

        if rendezvous_type == Gloo.RENDEZVOUS.HDFS:
            dfs_name = os.getenv("PADDLE_GLOO_FS_NAME", "")
            dfs_ugi = os.getenv("PADDLE_GLOO_FS_UGI", "")
            dfs_path = os.getenv("PADDLE_GLOO_FS_PATH", "")
            kwargs = {
                "dfs.name": dfs_name,
                "dfs.ugi": dfs_ugi,
                "dfs.path": dfs_path,
                "store.prefix": prefix,
            }
        elif rendezvous_type == Gloo.RENDEZVOUS.HTTP:
            ip = os.getenv("PADDLE_GLOO_HTTP_HOST", "")
            port = os.getenv("PADDLE_GLOO_HTTP_PORT", "")
            kwargs = {
                "http.host": ip,
                "http.port": port,
                "store.prefix": prefix,
            }
        else:
            dfs_path = os.getenv("PADDLE_GLOO_FS_PATH", "")
            kwargs = {
                "dfs.path": dfs_path,
                "store.prefix": prefix,
            }

        if rendezvous_type == Gloo.RENDEZVOUS.HDFS:
            type = "HDFS"
        elif rendezvous_type == Gloo.RENDEZVOUS.HTTP:
            type = "HTTP"
        else:
            type = "FILE"
        print("Gloo init with {}: need_init_all: {}, args: {}".format(
            type, need_init_all, kwargs))

        self._gloo.init(
            rendezvous=rendezvous_type,
            role=self._role,
            role_id=self._role_id(),
            worker_num=self._worker_num(),
            server_num=self._server_num(),
            need_init_all=need_init_all,
            kwargs=kwargs)

    def _generate_role(self):
        """
        generate role for role maker
        """
        if not self._role_is_generated:
            if not self._is_collective:
                self._ps_env()
            else:
                self._collective_env()
            self._role_is_generated = True
            self._gloo_init()


class UserDefinedRoleMaker(PaddleCloudRoleMaker):
    def __init__(self, is_collective=False, init_gloo=False, **kwargs):
        super(UserDefinedRoleMaker, self).__init__(
            is_collective=is_collective, init_gloo=init_gloo, **kwargs)
        self._init_gloo = init_gloo

    def _user_defined_ps_env(self):
        self._server_endpoints = self._kwargs.get("server_endpoints")
        self._worker_endpoints = self._kwargs.get("worker_endpoints", [])
        self._trainers_num = self._kwargs.get("worker_num", 0)

        if self._trainers_num == 0:
            assert (len(self._worker_endpoints) > 0)
            self._trainers_num = len(self._worker_endpoints)

        self._role = self._kwargs.get("role")
        self._current_id = self._kwargs.get("current_id")

        if self._role == Role.WORKER and len(
                self._worker_endpoints) > self._current_id:
            self._cur_endpoint = self._worker_endpoints[self._current_id]
        elif self._role == Role.SERVER:
            self._cur_endpoint = self._server_endpoints[self._current_id]
        self._nodes_num = len(
            set([x.split(':')[0] for x in self._worker_endpoints]))

    def _user_defined_collective_env(self):
        self._worker_endpoints = self._kwargs.get("worker_endpoints")
        self._current_id = self._kwargs.get("current_id")
        self._trainers_num = len(self._worker_endpoints)
        self._training_role = Role.WORKER
        self._nodes_num = len(
            set([x.split(':')[0] for x in self._worker_endpoints]))

    def _generate_role(self):
        """
        generate role for role maker
        """
        if not self._role_is_generated:
            if not self._is_collective:
                self._user_defined_ps_env()
            else:
                self._user_defined_collective_env()
            self._role_is_generated = True