# Copyright (c) 2019 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 from __future__ import print_function from __future__ import division import paddle.fluid as fluid from paddle.fluid import core, unique_name from ..base.private_helper_function import wait_server_ready from paddle.fluid.optimizer import PipelineOptimizer as PO from .meta_optimizer_base import MetaOptimizerBase from .common import OpRole, OP_ROLE_KEY, OP_ROLE_VAR_KEY, CollectiveHelper, is_update_op, is_loss_grad_op, is_backward_op, is_optimizer_op def _get_node_num(endpoints): ss = set() for ep in endpoints: ip = ep.split(":")[0].strip() if ip not in ss: ss.add(ip) return len(ss) class PipelineHelper(object): def __init__(self, role_maker, wait_port='6174'): self.wait_port = wait_port self.role_maker = role_maker def update_startup_program(self, startup_program=None, inner_parallelism=None): self.startup_program = startup_program nranks = self.role_maker._worker_num() rank = self.role_maker._worker_index() endpoints = self.role_maker._get_trainer_endpoints() current_endpoint = endpoints[rank] node_num = _get_node_num(endpoints) assert nranks % node_num == 0 # Create ring 0 for all gpus in the same pipeline if inner_parallelism > 1: pipeline_rank = rank % inner_parallelism pipeline_id = rank // inner_parallelism start_index = pipeline_id * inner_parallelism pipeline_endpoints = endpoints[start_index:start_index + inner_parallelism] self._init_communicator(self.startup_program, current_endpoint, pipeline_endpoints, pipeline_rank, 0, self.wait_port) pipeline_num = len(endpoints) // inner_parallelism if pipeline_num == 1: return # Create rings for gpus with the same pipeline id for data parallel eps = [] pipeline_rank = rank % inner_parallelism ring_id = pipeline_rank + 1 for i in range(pipeline_num): eps.append(endpoints[i * inner_parallelism + pipeline_rank]) # rank in a ring of gpus with the same pipeline id for data parallel dp_rank = rank // inner_parallelism self._init_communicator(self.startup_program, current_endpoint, eps, dp_rank, ring_id, self.wait_port) self._broadcast_params(ring_id) def _init_communicator(self, program, current_endpoint, endpoints, rank, ring_id, wait_port): nranks = len(endpoints) other_endpoints = endpoints[:] other_endpoints.remove(current_endpoint) if rank == 0 and wait_port: wait_server_ready(other_endpoints) block = program.global_block() nccl_id_var = block.create_var( name=unique_name.generate('nccl_id'), persistable=True, type=core.VarDesc.VarType.RAW) block.append_op( type='c_gen_nccl_id', inputs={}, outputs={'Out': nccl_id_var}, attrs={ 'rank': rank, 'endpoint': current_endpoint, 'other_endpoints': other_endpoints, OP_ROLE_KEY: OpRole.Forward, }) block.append_op( type='c_comm_init', inputs={'X': nccl_id_var}, outputs={}, attrs={ 'nranks': nranks, 'rank': rank, 'ring_id': ring_id, OP_ROLE_KEY: OpRole.Forward, }) def _broadcast_params(self, ring_id): block = self.startup_program.global_block() for var_name in block.vars: if "nccl_id" in var_name: continue param = block.var(var_name) if not param.persistable: continue block.append_op( type='c_broadcast', inputs={'X': param}, outputs={'Out': param}, attrs={ 'ring_id': ring_id, 'root': 0, OP_ROLE_KEY: OpRole.Forward }) block.append_op( type='c_sync_comm_stream', inputs={'X': param}, outputs={'Out': param}, attrs={'ring_id': ring_id, OP_ROLE_KEY: OpRole.Forward}) class PipelineOptimizer(MetaOptimizerBase): def __init__(self, optimizer): super(PipelineOptimizer, self).__init__(optimizer) self.inner_opt = optimizer # we do not allow meta optimizer to be inner optimizer currently self.meta_optimizers_white_list = [] self.meta_optimizers_black_list = ["GraphExecutionOptimizer", ] def _set_basic_info(self, loss, role_maker, user_defined_optimizer, user_defined_strategy): super(PipelineOptimizer, self)._set_basic_info( loss, role_maker, user_defined_optimizer, user_defined_strategy) self.num_microbatches = user_defined_strategy.pipeline_configs[ 'micro_batch'] def _can_apply(self): if not self.role_maker._is_collective: return False if self.user_defined_strategy.pipeline == True: return True return False def _disable_strategy(self, dist_strategy): dist_strategy.pipeline = False dist_strategy.pipeline_configs = {} def _enable_strategy(self, dist_strategy, context): dist_strategy.pipeline = True dist_strategy.pipeline_configs = {"micro_batch": 1, } def minimize_impl(self, loss, startup_program=None, parameter_list=None, no_grad_set=None): endpoints = self.role_maker._get_trainer_endpoints() current_endpoint = endpoints[self.role_maker._worker_index()] self.wrapped_opt = PO(self.inner_opt, num_microbatches=self.num_microbatches) node_num = _get_node_num(endpoints) gpus_per_node = len(endpoints) // node_num self.startup_program = startup_program if startup_program is None: self.startup_program = fluid.default_startup_program() self.rank = self.role_maker._worker_index() self.nranks = self.role_maker._worker_num() assert self.nranks % node_num == 0 loss.block.program._pipeline_opt = dict() loss.block.program._pipeline_opt['local_rank'] = self.rank optimize_ops, params_grads, prog_list = self.wrapped_opt.minimize( loss, startup_program, parameter_list, no_grad_set) assert prog_list self.main_program_list = prog_list self.main_program = loss.block.program self.inner_parallelism = loss.block.program._pipeline_opt[ 'inner_parallelism'] assert self.nranks % self.inner_parallelism == 0 pipeline_helper = PipelineHelper(self.role_maker) pipeline_helper.update_startup_program( self.startup_program._pipeline_opt["startup_program"], self.inner_parallelism) pipeline_num = self.nranks // self.inner_parallelism self._transpile_main_program(loss, pipeline_num, self.inner_parallelism) return optimize_ops, params_grads def _transpile_main_program(self, loss, pipeline_num, inner_parallelism): if pipeline_num <= 1: return self._insert_loss_grad_ops(loss, pipeline_num) for ring_id in range(1, inner_parallelism + 1): self._insert_allreduce_ops(ring_id) def _insert_loss_grad_ops(self, loss, pipeline_num): """ In order to keep the learning rate consistent in different numbers of training workers, we scale the loss grad by the number of workers """ block = self.main_program_list[-1]['program'].global_block() for idx, op in reversed(list(enumerate(block.ops))): if is_loss_grad_op(op): loss_grad_var = block.vars[op.output_arg_names[0]] block._insert_op( idx + 1, type='scale', inputs={'X': loss_grad_var}, outputs={'Out': loss_grad_var}, attrs={ 'scale': 1.0 / pipeline_num, OP_ROLE_KEY: OpRole.Backward }) def _insert_allreduce_ops(self, ring_id): block = self.main_program_list[ring_id - 1]['program'].global_block() origin_block = self.main_program.global_block() grad = None for idx, op in reversed(list(enumerate(block.ops))): if is_backward_op(op) and \ OP_ROLE_VAR_KEY in op.attr_names: op_role_var = op.all_attrs()[OP_ROLE_VAR_KEY] if len(op_role_var) == 0: continue assert len(op_role_var) % 2 == 0 offset = idx for i in range(0, len(op_role_var), 2): param = block.vars[op_role_var[i]] grad = block.vars[op_role_var[i + 1]] origin_param = origin_block.vars[op_role_var[i]] if origin_param.is_distributed: continue if offset == idx: offset += 1 block._insert_op( offset, type='c_sync_calc_stream', inputs={'X': grad}, outputs={'Out': grad}, attrs={OP_ROLE_KEY: OpRole.Backward}) offset += 1 block._insert_op( offset, type='c_allreduce_sum', inputs={'X': grad}, outputs={'Out': grad}, attrs={ 'ring_id': ring_id, OP_ROLE_KEY: OpRole.Backward }) if grad is None: return for idx, op in enumerate(block.ops): if is_optimizer_op(op): block._insert_op( idx, type='c_sync_comm_stream', inputs={'X': grad}, outputs={'Out': grad}, attrs={'ring_id': ring_id, OP_ROLE_KEY: OpRole.Backward}) break