wehub-resource-sync
517 lines
18 KiB
Python
517 lines
18 KiB
Python
# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import paddle
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from paddle.base import core, unique_name
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from paddle.base.executor import global_scope
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from paddle.base.framework import Variable, name_scope
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from paddle.base.layer_helper import LayerHelper
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from paddle.nn import ClipGradByGlobalNorm
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from paddle.optimizer import Optimizer
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def init_communicator(block, rank, ranks, ring_id):
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eps = os.environ['PADDLE_TRAINER_ENDPOINTS']
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eps = [ep.strip() for ep in eps.split(",") if ep.strip()]
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cur_ep = eps[rank]
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other_eps = [eps[r] for r in ranks if r != rank]
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local_rank = ranks.index(rank)
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comm_var_name = unique_name.generate('comm_id')
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comm_id_var = block.create_var(
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name=comm_var_name, persistable=True, type=core.VarDesc.VarType.RAW
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)
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if core.is_compiled_with_cuda():
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block.append_op(
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type='c_gen_nccl_id',
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inputs={},
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outputs={'Out': comm_id_var},
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attrs={
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'rank': local_rank,
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'endpoint': cur_ep,
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'other_endpoints': other_eps,
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'ring_id': ring_id,
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},
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)
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elif core.is_compiled_with_xpu():
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block.append_op(
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type='c_gen_bkcl_id',
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inputs={},
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outputs={'Out': comm_id_var},
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attrs={
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'rank': local_rank,
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'endpoint': cur_ep,
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'other_endpoints': other_eps,
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'ring_id': ring_id,
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},
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)
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elif (
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paddle.distributed.ParallelEnv().device_type
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in paddle.device.get_all_custom_device_type()
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):
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block.append_op(
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type='c_gen_xccl_id',
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inputs={},
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outputs={'Out': comm_id_var},
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attrs={
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'rank': local_rank,
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'endpoint': cur_ep,
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'other_endpoints': other_eps,
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'ring_id': ring_id,
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},
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)
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block.append_op(
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type='c_comm_init',
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inputs={'X': comm_id_var},
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outputs={},
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attrs={
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'nranks': len(ranks),
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'rank': local_rank,
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'ring_id': ring_id,
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'endpoints': ','.join(eps),
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},
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)
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tmp_var = block.create_var(name=unique_name.generate('tmp'))
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block.append_op(
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type='fill_constant', outputs={'Out': tmp_var}, attrs={'value': 1}
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)
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block.append_op(
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type='all_reduce',
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inputs={'x': tmp_var},
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outputs={'out': tmp_var},
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attrs={
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'ring_id': ring_id,
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'reduce_type': paddle.distributed.ReduceOp.SUM,
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},
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)
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block.append_op(
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type='c_sync_calc_stream',
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inputs={'X': tmp_var},
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outputs={'Out': tmp_var},
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)
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return ring_id
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def broadcast_parameters(block, parameters, ring_id):
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for p in parameters:
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block.append_op(
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type='broadcast',
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inputs={'x': p},
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outputs={'out': p},
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attrs={
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'ring_id': ring_id,
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},
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)
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class DistributedFusedLamb(Optimizer):
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def __init__(
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self,
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learning_rate=0.001,
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lamb_weight_decay=0.01,
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beta1=0.9,
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beta2=0.999,
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epsilon=1e-6,
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parameters=None,
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grad_clip=None,
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exclude_from_weight_decay_fn=None,
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clip_after_allreduce=True,
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is_grad_scaled_by_nranks=True,
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alignment=128,
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use_master_param_norm=True,
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gradient_accumulation_steps=1,
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use_master_acc_grad=True,
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nproc_per_node=None,
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use_hierarchical_allreduce=False,
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name=None,
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):
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assert not paddle.in_dynamic_mode(), (
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"DistributedFusedLamb does not support dygraph mode"
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)
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super().__init__(learning_rate=learning_rate, grad_clip=None, name=name)
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self._beta1 = beta1
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self._beta2 = beta2
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self._epsilon = epsilon
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self._weight_decay = (
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lamb_weight_decay if lamb_weight_decay is not None else 0.0
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)
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if grad_clip is not None:
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assert isinstance(grad_clip, ClipGradByGlobalNorm), (
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"Only ClipGradByGlobalNorm is supported in DistributedFusedLamb"
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)
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max_global_grad_norm = grad_clip.clip_norm
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else:
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max_global_grad_norm = -1.0
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self._max_global_grad_norm = max_global_grad_norm
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self._alignment = alignment if alignment is not None else -1
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self._clip_after_allreduce = clip_after_allreduce
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self._is_grad_scaled_by_nranks = is_grad_scaled_by_nranks
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self._exclude_from_weight_decay_fn = exclude_from_weight_decay_fn
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self._scale = None
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self._use_master_param_norm = use_master_param_norm
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self._gradient_accumulation_steps = gradient_accumulation_steps
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self._use_master_acc_grad = use_master_acc_grad
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self._nproc_per_node = nproc_per_node
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self._use_hierarchical_allreduce = use_hierarchical_allreduce
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assert self._gradient_accumulation_steps >= 1
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self.helper = LayerHelper('distributed_fused_lamb')
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self._supports_check_nan_inf = True # very import flag for AMP
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main_block = self.helper.main_program.global_block()
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self._found_inf = main_block.create_var(
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name=unique_name.generate('found_inf'),
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shape=[1],
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dtype=core.VarDesc.VarType.BOOL,
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)
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self._step = None
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if self._gradient_accumulation_steps > 1:
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self._stop_update = main_block.create_var(
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name=unique_name.generate('stop_update'),
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shape=[1],
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dtype=core.VarDesc.VarType.BOOL,
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)
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else:
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self._stop_update = None
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self._param_to_master_param = {}
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def _get_stop_update_var(self):
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return self._stop_update if self._stop_update is not None else False
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def _set_step(self, step):
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self._step = step
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def _get_or_create_step(self):
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if self._step is None:
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self._step = self._create_persistable_var('step', dtype='int64')
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return self._step
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def _set_scale(self, scale):
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assert scale is not None
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if not isinstance(scale, Variable):
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scale = self._create_scale_from_constant(scale)
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self._scale = scale
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def _create_scale_from_constant(self, value):
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name = unique_name.generate('global_scale')
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return paddle.static.create_global_var(
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name=name,
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shape=[1],
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dtype='float32',
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value=float(value),
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persistable=True,
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)
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def _get_or_create_scale(self):
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if self._scale is None:
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self._scale = self._create_scale_from_constant(1.0)
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return self._scale
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def _create_persistable_var(self, name=None, shape=[-1], dtype='float32'):
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startup_block = self.helper.startup_program.global_block()
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if name is not None:
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name = unique_name.generate(name)
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startup_var = startup_block.create_var(
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name=name,
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shape=shape,
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dtype=dtype,
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persistable=True,
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stop_gradient=True,
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)
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main_block = self.helper.main_program.global_block()
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main_var = main_block.create_var(
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name=startup_var.name,
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shape=startup_var.shape,
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dtype=startup_var.dtype,
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persistable=True,
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stop_gradient=True,
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)
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return main_var
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def _get_parameter(self, name, scope=None):
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if scope is None:
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scope = global_scope()
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master_param = self._param_to_master_param.get(name)
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assert master_param is not None
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master_param_t = scope.find_var(master_param).get_tensor()
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assert master_param_t._dtype() == paddle.float32
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param_t = scope.find_var(name).get_tensor()
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if param_t._dtype() == paddle.float32:
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assert param_t._ptr() == master_param_t._ptr()
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return param_t, None
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else:
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assert param_t._dtype() == paddle.float16
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assert param_t.shape() == master_param_t.shape()
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return param_t, master_param_t
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def apply_optimize(self, params_grads):
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self.apply_gradients(params_grads)
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def apply_gradients(self, params_grads):
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flattened = []
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for p, g in params_grads:
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flattened.extend([p, g])
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with (
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flattened[0].block.program._optimized_guard(flattened),
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name_scope("optimizer"),
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):
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self._apply_gradients_impl(params_grads)
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def _apply_gradients_impl(self, params_grads):
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for p, g in params_grads:
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assert g.type == core.VarDesc.VarType.DENSE_TENSOR, (
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"Only support dense gradient"
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)
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g.persistable = True # the gradient must be persistable for fusion
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fp32_fused_param = self._create_persistable_var('fp32_fused_param')
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fp32_fused_grad = self._create_persistable_var('fp32_fused_grad')
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fp16_fused_param = self._create_persistable_var(
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'fp16_fused_param', dtype='float16'
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)
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fp16_fused_grad = self._create_persistable_var(
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'fp16_fused_grad', dtype='float16'
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)
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master_params = []
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for p, g in params_grads:
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master_p = self._create_persistable_var('master_weight')
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self._param_to_master_param[p.name] = master_p.name
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master_params.append(master_p)
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moment1 = self._create_persistable_var('moment1')
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moment1.is_distributed = True
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moment2 = self._create_persistable_var('moment2')
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moment2.is_distributed = True
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beta1pow = self._create_persistable_var('beta1pow')
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beta2pow = self._create_persistable_var('beta2pow')
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param_info = self._create_persistable_var('param_info', dtype='int32')
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param_info.is_distributed = True
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fused_offsets = self._create_persistable_var(
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'fused_offsets', dtype='int32'
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)
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fp32_partial_fused_offsets = self._create_persistable_var(
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'fp32_partial_fused_offsets', dtype='int32'
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)
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fp32_partial_fused_offsets.is_distributed = True
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fp16_partial_fused_offsets = self._create_persistable_var(
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'fp16_partial_fused_offsets', dtype='int32'
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)
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fp16_partial_fused_offsets.is_distributed = True
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param_order = self._create_persistable_var('param_order', dtype='int32')
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param_order.is_distributed = True
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if self._gradient_accumulation_steps > 1:
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fp32_acc_fused_grad = [
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self._create_persistable_var('fp32_acc_fused_grad')
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]
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fp16_acc_fused_grad = [
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self._create_persistable_var(
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'fp16_acc_fused_grad', dtype='float16'
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)
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]
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acc_step = [self._create_persistable_var('acc_step', dtype='int64')]
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else:
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fp32_acc_fused_grad = []
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fp16_acc_fused_grad = []
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acc_step = []
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step = self._get_or_create_step()
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rank = paddle.distributed.get_rank()
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nranks = paddle.distributed.get_world_size()
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if self._nproc_per_node is None:
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nproc_per_node = nranks
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else:
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nproc_per_node = self._nproc_per_node
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assert nranks % nproc_per_node == 0, (
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"nranks should be exactly divided by nproc_per_node"
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)
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shard_inside_node = nranks > nproc_per_node
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local_rank = rank % nproc_per_node
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node_id = int(rank / nproc_per_node)
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node_num = int(nranks / nproc_per_node)
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ring_ids = []
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startup_block = self.helper.startup_program.global_block()
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if nranks > 1:
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ring_id = init_communicator(
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startup_block, rank, list(range(nranks)), 0
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)
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ring_ids.append(ring_id)
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use_hierarchical_allreduce = False
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if node_num > 1 and len(ring_ids) <= 1 and shard_inside_node:
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local_group_ranks = list(
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range(node_id * nproc_per_node, (node_id + 1) * nproc_per_node)
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)
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ring_id = init_communicator(
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startup_block, rank, local_group_ranks, 1
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)
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ring_ids.append(ring_id)
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if self._use_hierarchical_allreduce and nranks > nproc_per_node:
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use_hierarchical_allreduce = True
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outer_group_ranks = list(
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range(rank % nproc_per_node, nranks, nproc_per_node)
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)
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ring_id = init_communicator(
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startup_block, rank, outer_group_ranks, ring_ids[-1] + 1
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)
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ring_ids.append(ring_id)
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scale = self._get_or_create_scale()
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params = [p for p, _ in params_grads]
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grads = [g for _, g in params_grads]
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apply_weight_decay = [1] * len(params)
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if self._exclude_from_weight_decay_fn is not None:
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for i, p in enumerate(params):
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if self._exclude_from_weight_decay_fn(p):
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apply_weight_decay[i] = 0
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for g in grads:
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startup_block.create_var(
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name=g.name,
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type=g.type,
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dtype=g.dtype,
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persistable=g.persistable,
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shape=g.shape,
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)
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if nranks > 1:
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broadcast_parameters(startup_block, params, ring_ids[0])
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startup_block.append_op(
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type='distributed_fused_lamb_init',
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inputs={
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'Param': params,
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'Grad': grads,
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},
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outputs={
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'FP32FusedParam': [fp32_fused_param],
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'FP32FusedGrad': [fp32_fused_grad],
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'FP16FusedParam': [fp16_fused_param],
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'FP16FusedGrad': [fp16_fused_grad],
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'Moment1': [moment1],
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'Moment2': [moment2],
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'Beta1Pow': [beta1pow],
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'Beta2Pow': [beta2pow],
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'GlobalScale': [scale],
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'ParamInfo': [param_info],
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'ParamOut': params,
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'MasterParamOut': master_params,
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'GradOut': grads,
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'FP32ShardFusedParamOffsets': [fp32_partial_fused_offsets],
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'FP16ShardFusedParamOffsets': [fp16_partial_fused_offsets],
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'FusedParamOffsets': [fused_offsets],
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'ParamOrder': [param_order],
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'Step': [step],
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},
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attrs={
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'alignment': self._alignment,
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'rank': local_rank if shard_inside_node else rank,
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'nranks': nproc_per_node if shard_inside_node else nranks,
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'apply_weight_decay': apply_weight_decay,
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'moment1': 0.0,
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'moment2': 0.0,
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'beta1': self._beta1,
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'beta2': self._beta2,
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},
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)
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main_block = self.helper.main_program.global_block()
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self._create_global_learning_rate()
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lr = None
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for p_g in params_grads:
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if lr is None:
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lr = self._create_param_lr(p_g)
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else:
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new_lr = self._create_param_lr(p_g)
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assert id(lr) == id(new_lr), (
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"The learning rate for each parameter should be the same"
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)
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assert lr is not None
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lamb_op = main_block.append_op(
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type='distributed_fused_lamb',
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inputs={
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'FP32FusedParam': [fp32_fused_param],
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'FP32FusedGrad': [fp32_fused_grad],
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'FP16FusedParam': [fp16_fused_param],
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'FP16FusedGrad': [fp16_fused_grad],
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'LearningRate': [lr],
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'Moment1': [moment1],
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'Moment2': [moment2],
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'Beta1Pow': [beta1pow],
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'Beta2Pow': [beta2pow],
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'GlobalScale': [scale],
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'ParamInfo': [param_info],
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'Param': params,
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'Grad': grads,
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'FusedParamOffsets': [fused_offsets],
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'FP32ShardFusedParamOffsets': [fp32_partial_fused_offsets],
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'FP16ShardFusedParamOffsets': [fp16_partial_fused_offsets],
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'ParamOrder': [param_order],
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},
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outputs={
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'FP32FusedParamOut': [fp32_fused_param],
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'FP16FusedParamOut': [fp16_fused_param],
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'Moment1Out': [moment1],
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'Moment2Out': [moment2],
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'Beta1PowOut': [beta1pow],
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'Beta2PowOut': [beta2pow],
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'ParamOut': params,
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|
'GradOut': grads,
|
|
'FoundInf': [self._found_inf],
|
|
'FP32AccFusedGrad': fp32_acc_fused_grad,
|
|
'FP16AccFusedGrad': fp16_acc_fused_grad,
|
|
'AccStep': acc_step,
|
|
'StopUpdate': (
|
|
self._stop_update if self._stop_update is not None else []
|
|
),
|
|
'Step': [step],
|
|
},
|
|
attrs={
|
|
'weight_decay': self._weight_decay,
|
|
'beta1': self._beta1,
|
|
'beta2': self._beta2,
|
|
'epsilon': self._epsilon,
|
|
'max_global_grad_norm': self._max_global_grad_norm,
|
|
'clip_after_allreduce': self._clip_after_allreduce,
|
|
'rank': rank,
|
|
'nranks': nranks,
|
|
'ring_ids': ring_ids,
|
|
'use_master_param_norm': self._use_master_param_norm,
|
|
'is_grad_scaled_by_nranks': self._is_grad_scaled_by_nranks,
|
|
'acc_steps': self._gradient_accumulation_steps,
|
|
'use_master_acc_grad': self._use_master_acc_grad,
|
|
'use_hierarchical_allreduce': use_hierarchical_allreduce,
|
|
},
|
|
)
|
|
return [lamb_op]
|