# Copyright 2024 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
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# Unless required by applicable law or agreed to in writing, software
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# ============================================================================
"""Parameter broadcast"""
from __future__ import absolute_import
__all__ = ["parameter_broadcast"]
import numpy as np
import mindspore as ms
from mindspore.communication import get_rank, create_group, get_group_size
[文档]def parameter_broadcast(net, layout, cur_rank=0, initial_rank=0):
"""
Broadcast parameter to other rank in data parallel dimension.
.. warning::
This is an experimental API that is subject to change or deletion.
Args:
net (Cell): The network where the parameters will be broadcasted.
layout (Dict): Parameter layout dictionary. Come from
:func:`mindspore.nn.Cell.parameter_layout_dict`
or read from file(for example: "strategy.ckpt" saved by using the
`strategy_ckpt_config` parameter of :func:`mindspore.set_auto_parallel_context`).
The key is param name, the value is the layout of this parameter.
cur_rank (int, optional): current rank id. Default: ``0``.
initial_rank (int, optional): Start rank id for each pipeline. Default: ``0``.
Raises:
ValueError: `cur_rank` is not rank id of current rank.
ValueError: `initial_rank` is not the start rank id of current pipeline stage.
ValueError: Parameter name in `layout` can not be found in
:func:`mindspore.nn.Cell.parameters_dict`.
Examples:
>>> import os
>>> import mindspore as ms
>>> import mindspore.dataset as ds
>>> from mindspore import nn, ops
>>> from mindspore.communication import init
>>> from mindspore.common.initializer import initializer
>>> from mindspore.train import Model
>>> from mindspore.parallel.parameter_broadcast import parameter_broadcast
>>> from mindspore.train.serialization import load_checkpoint, load_param_into_net
>>> ms.set_context(mode=ms.GRAPH_MODE)
>>> ms.set_context(max_device_memory="28GB")
>>> ms.set_auto_parallel_context(parallel_mode=ms.ParallelMode.SEMI_AUTO_PARALLEL)
>>> init()
>>> ms.set_seed(1)
>>> class Network(nn.Cell):
... def __init__(self):
... super().__init__()
... self.flatten = ops.Flatten()
... self.fc1_weight = ms.Parameter(initializer("normal", [28*28, 512], ms.float32))
... self.fc2_weight = ms.Parameter(initializer("normal", [512, 512], ms.float32))
... self.fc3_weight = ms.Parameter(initializer("normal", [512, 10], ms.float32))
... self.matmul1 = ops.MatMul()
... self.relu1 = ops.ReLU()
... self.matmul2 = ops.MatMul()
... self.relu2 = ops.ReLU()
... self.matmul3 = ops.MatMul()
... def construct(self, x):
... x = self.flatten(x)
... x = self.matmul1(x, self.fc1_weight)
... x = self.relu1(x)
... x = self.matmul2(x, self.fc2_weight)
... x = self.relu2(x)
... logits = self.matmul3(x, self.fc3_weight)
... return logits
>>> net = Network()
>>> net.matmul1.shard(((2, 4), (4, 1)))
>>> net.relu1.shard(((4, 1),))
>>> net.matmul2.shard(((1, 8), (8, 1)))
>>> net.relu2.shard(((8, 1),))
>>> # Create the dataset taking MNIST as an example. Refer to
>>> # https://gitee.com/mindspore/docs/blob/master/docs/mindspore/code/mnist.py
>>> dataset = create_dataset()
>>> optim = nn.SGD(net.trainable_params(), 1e-2)
>>> loss = nn.CrossEntropyLoss()
>>> model = Model(net, loss_fn=loss, optimizer=optim)
>>> model.train(1, dataset)
>>> ms.save_checkpoint(net, "./simple.ckpt", False)
>>> layout = model.train_network.parameter_layout_dict
>>> param_dict = load_checkpoint("./simple.ckpt")
>>> load_param_into_net(net, param_dict)
>>> rank_id = os.environ["RANK_ID"]
>>> parameter_broadcast(model.train_network, layout, int(rank_id), 0)
>>> class LossCallBack(Callback):
... def step_end(self, run_context):
... cb_params = run_context.original_args()
... print("step end, cur step num: ", cb_params.cur_step_num, flush=True)
>>> model.train(1, dataset, callbacks=[LossCallBack()])
"""
if not layout:
return
from mindspore.train._utils import get_parameter_redundancy, remove_param_redundancy
from mindspore.nn.wrap.cell_wrapper import AllreduceGraph
origin_parallel_mode = ms.get_auto_parallel_context("parallel_mode")
if origin_parallel_mode not in ("semi_auto_parallel", "auto_parallel"):
return
if cur_rank != get_rank():
raise ValueError(f"For parameter broadcast, the cur_rank: {cur_rank} is wrong.")
if initial_rank % (get_group_size() / ms.get_auto_parallel_context("pipeline_stages")) != 0:
raise ValueError(f"For parameter broadcast, the initial_rank: {initial_rank} is wrong.")
param_redundancy = get_parameter_redundancy(layout, initial_rank)
if not param_redundancy:
return
single_params = remove_param_redundancy(param_redundancy)
if not single_params:
return
param_redundancy_reversed = {}
for key, redundancy in param_redundancy.items():
for item in redundancy:
if len(item) == 1:
continue
if cur_rank in item:
param_redundancy_reversed.setdefault(item, []).append(key)
if not param_redundancy_reversed:
return
if cur_rank not in single_params:
return
net_param_dict = net.parameters_dict()
ms.set_auto_parallel_context(parallel_mode="hybrid_parallel")
for group, params in param_redundancy_reversed.items():
create_group(str(group), list(group))
allreduce_input = []
for param in params:
if param not in net_param_dict:
raise ValueError(f"For parameter broadcast, the param: {param} can not be found.")
real_param = net_param_dict[param]
if param not in single_params[cur_rank]:
real_param.set_data(ms.Tensor(np.zeros(real_param.shape), dtype=real_param.dtype))
allreduce_input.append(real_param)
if not allreduce_input:
continue
allreduce_graph = AllreduceGraph(allreduce_input, str(group))
allreduce_graph()
ms.set_auto_parallel_context(parallel_mode=origin_parallel_mode)