easyFL: A Lightning Framework for Federated Learning
This repository is PyTorch implementation for the IJCAI-21 paper Federated Learning with Fair Averaging.
Our easyFL is a strong and reusable experimental platform for research on federated learning (FL) algorithm, which has provided a few easy-to-use modules to hold out for those who want to do various federated learning experiments. In short, it is easy for FL-researchers to
- quickly realize and compare popular centralized federated learning algorithms (Look Here)
- transform traditional machine learning tasks into federated tasks by following our paradigm of constructing data pipeline (Look Here)
- make interesting observations during training time to get a deeper insight of federated learning in a code-incremental manner without destorying the original realization (Look Here)
- efficiently manage and analyze the experiment records with
utils/result_analysis.py
Table of Contents
Requirements
The project is implemented using Python3 with dependencies below:
numpy>=1.17.2
pytorch>=1.3.1
torchvision>=0.4.2
cvxopt>=1.2.0
scipy>=1.3.1
matplotlib>=3.1.1
prettytable>=2.1.0
ujson>=4.0.2
QuickStart
First, run the command below to get the splited dataset MNIST:
# generate the splited dataset
python generate_fedtask.py --benchmark mnist_classification --dist 0 --skew 0 --num_clients 100
Second, run the command below to quickly get a result of the basic algorithm FedAvg on MNIST with a simple CNN:
python main.py --task mnist_classification_cnum100_dist0_skew0_seed0 --model cnn --algorithm fedavg --num_rounds 20 --num_epochs 5 --learning_rate 0.215 --proportion 0.1 --batch_size 10 --eval_interval 1
# if using gpu, add the id of the gpu device as '--gpu id' to the end of the command like this
# python main.py --task mnist_classification_cnum100_dist0_skew0_seed0 --model cnn --algorithm fedavg --num_rounds 20 --num_epochs 5 --learning_rate 0.215 --proportion 0.1 --batch_size 10 --eval_interval 1 --gpu 0
The result will be stored in ./fedtask/mnist_classification_cnum100_dist0_skew0_seed0/record/
.
Third, run the command below to get a visualization of the result.
# change to the ./utils folder
cd ../utils
# visualize the results
python result_analysis.py
Performance
The rounds necessary for FedAVG to achieve 99% test accuracy on MNIST using CNN with E=5 (reported in [McMahan. et al. 2017] / ours) | ||||
Proportion | iid | non-iid | ||
B=FULL | B=10 | B=FULL | B=10 | |
0.0 | 387 / 325 | 50 / 91 | 1181 / 1021 | 956 / 771 |
0.1 | 339 / 203 | 18 / 18 | 1100 / 453 | 206 / 107 |
0.2 | 337 / 207 | 18 / 19 | 978 / 525 | 200 / 95 |
0.5 | 164 / 214 | 18 / 18 | 1067 / 606 | 261 / 105 |
1.0 | 246 / 267 | 16 / 18 | -- / 737 | 97 / 90 |
Accelarating FL Process by Increasing Parallelism For FedAVG on MNIST using CNN (20/100 clients per round) | ||||||
Num_threads | 1 | 2 | 5 | 10 | 15 | 20 |
Mean of time cost per round(s/r) | 19.5434 | 13.5733 | 9.9935 | 9.3092 | 9.2885 | 8.3867 |
Reproduced FL Algorithms
Method | Reference | Publication |
---|---|---|
FedAvg | [McMahan et al., 2017] | AISTATS' 2017 |
FedProx | [Li et al., 2020] | MLSys' 2020 |
FedFV | [Wang et al., 2021] | IJCAI' 2021 |
qFFL | [Li et al., 2019] | ICLR' 2020 |
AFL | [Mohri et al., 2019] | ICML' 2019 |
FedMGDA+ | [Hu et al., 2020] | pre-print |
FedFA | [Huang et al., 2020] | pre-print |
SCAFFOLD | [Karimireddy et al., 2020] | ICML' 2020 |
FedDyn | [Acar et al., 2021] | ICLR' 2021 |
... |
For those who want to realize their own federaed algorithms or reproduce others, please see algorithms/readme.md
, where we take two simple examples to show how to use easyFL for the popurse.
Dataset Partition Visualizing
We also provide the visualization of dataset partitioned by labels. Here we take the partition of CIFAR100/MNIST/CIFAR10 as the examples. Across all the examples, each row in the figure corresponds to the local data of one client, and different colors represent different labels. The x axis is the number of samples in the local dataset.
Di ~ D where dist=0
Each local dataset is I.I.D. drawn from the global distribution. Here we allocate the data of CIFAR100 to 100 clients. The iid can also be gengerated by setting (dist=2, skew=0) or (dist=1, skew=0). We list the results of the three IID partition manners below (i.e. dist=0,1,2 from left to right).
|{Di(Y)}|=K where dist=1
Each local dataset is allocated K labels of data. The visualization of the partition is on MNIST. There are 10 clients in each picture.
Di ~ Dirichlet(αP) where dist=2
Here the partitioned dataset obeys the dirichlet(alpha * p) distirbution. The dataset is allocated to 100 clients and each client has a similar amount data size (i.e. balance). The hyperparameters skewness
controls the non-i.i.d. degree of the federated dataset, which increases from the left (skewness=0.0 => alpha=inf) to the right (skewness=1.0 => alpha=0).
To generate these fedtasks, run the command below
# I.I.D.
python generated_fedtask.py --dist 0 --skew 0 --num_client 100 --benchmark cifar100_classification
# skew=0.39,0.69,0.79
python generated_fedtask.py --dist 1 --skew 0.39 --num_client 10 --benchmark mnist_classification
# varying skew from 0.0 to 1.0
python generated_fedtask.py --dist 2 --skew 0.0 --num_client 100 --benchmark cifar10_classification
Options
Basic options:
-
task
is to choose the task of splited dataset. Options: name of fedtask (e.g.mnist_client100_dist0_beta0_noise0
). -
algorithm
is to choose the FL algorithm. Options:fedfv
,fedavg
,fedprox
, … -
model
should be the corresponding model of the dataset. Options:mlp
,cnn
,resnet18.
Server-side options:
-
sample
decides the way to sample clients in each round. Options:uniform
means uniformly,md
means choosing with probability. -
aggregate
decides the way to aggregate clients' model. Options:uniform
,weighted_scale
,weighted_com
-
num_rounds
is the number of communication rounds. -
proportion
is the proportion of clients to be selected in each round. -
lr_scheduler
is the global learning rate scheduler. -
learning_rate_decay
is the decay rate of the global learning rate.
Client-side options:
-
num_epochs
is the number of local training epochs. -
num_steps
is the number of local updating steps and the default value is -1. If this term is set to larger than 0, thennum_epochs
is invalid. -
learning_rate
is the step size when locally training. -
batch_size
is the size of one batch data during local training.batch_size = full_batch
ifbatch_size==-1
andbatch_size=|Di|*batch_size
if1>batch_size>0
. -
optimizer
is to choose the optimizer. Options:SGD
,Adam
. -
momentum
is the ratio of the momentum item when the optimizer SGD taking each step.
Other options:
-
seed
is the initial random seed. -
gpu
is the id of the GPU device,-1
for CPU. -
eval_interval
controls the interval between every two evaluations. -
net_drop
controls the dropout of clients after being selected in each communication round according to distribution Beta(net_drop,1). The larger this term is, the more possible for clients to drop. -
net_active
controls the active rate of clients before being selected in each communication round according to distribution Beta(net_active,1). The larger this term is, the more possible for clients to be active. -
num_threads
is the number of threads in the clients computing session that aims to accelarate the training process.
Additional hyper-parameters for particular federated algorithms:
mu
is the parameter for FedProx.alpha
is the parameter for FedFV.tau
is the parameter for FedFV.- ...
Each additional parameter can be defined in ./utils/fflow.read_option
Architecture
We seperate the FL system into four parts: benchmark
, fedtask
, method
and utils
.
├─ benchmark
│ ├─ mnist_classification //classification on mnist dataset
│ │ ├─ model //the corresponding model
│ | └─ core.py //the core supporting for the dataset, and each contains three necessary classes(e.g. TaskGen, TaskReader, TaskCalculator)
│ ├─ ...
│ ├─ RAW_DATA // storing the downloaded raw dataset
│ └─ toolkits.py //the basic tools for generating federated dataset
├─ fedtask
│ ├─ mnist_client100_dist0_beta0_noise0//IID(beta=0) MNIST for 100 clients with not predefined noise
│ │ ├─ record //the directionary of the running result
│ | └─ data.json //the splitted federated dataset (fedtask)
| └─ ...
├─ method
│ ├─ fedavg.py //FL algorithm implementation inherit fedbase.py
│ ├─ fedbase.py //FL algorithm superclass(i.e.,fedavg)
│ ├─ fedfv.py //our FL algorithm
│ ├─ fedprox.py
| └─ ...
├─ utils
│ ├─ fflow.py //option to read, initialize,...
│ ├─ fmodule.py //model-level operators
│ ├─ network_simulator.py //simulating the network heterogeneity
│ └─ result_analysis.py //to generate the visualization of record
├─ generate_fedtask.py //generate fedtask
├─ requirements.txt
└─ main.py //run this file to start easyFL system
Benchmark This module is to generate `fedtask` by partitioning the particular distribution data through `generate_fedtask.py`. To generate different `fedtask`, there are three parameters: `dist`, `num_clients `, `beta`. `dist` denotes the distribution type (e.g. `0` denotes iid and balanced distribution, `1` denotes niid-label-quantity and balanced distribution). `num_clients` is the number of clients participate in FL system, and `beta` controls the degree of non-iid for different `dist`. Each dataset can correspond to differrent models (mlp, cnn, resnet18, …). We refer to [McMahan et al., 2017], [Li et al., 2020], [Li et al., 2021], [Li et al., 2019], [Caldas et al., 2018], [He et al., 2020] when realizing this module. Further details are described in `benchmark/README.md`.
Fedtask
We define each task as a combination of the federated dataset of a particular distribution and the experimental results on it. The raw dataset is processed into .json file, following LEAF (https://github.com/TalwalkarLab/leaf). The architecture of the data.json file is described as below:
"""
# store the raw data
{
'store': 'XY'
'client_names': ['user0', ..., 'user99']
'user0': {
'dtrain': {'x': [...], 'y': [...]},
'dvalid': {'x': [...], 'y': [...]},
},...,
'user99': {
'dtrain': {'x': [...], 'y': [...]},
'dvalid': {'x': [...], 'y': [...]},
},
'dtest': {'x':[...], 'y':[...]}
}
# store the index of data in the original dataset
{
'store': 'IDX'
'datasrc':{
'class_path': 'torchvision.datasets',
'class_name': dataset_class_name,
'train_args': {
'root': "str(raw_data_path)",
...
},
'test_args': {
'root': "str(raw_data_path)",
...
}
}
'client_names': ['user0', ..., 'user99']
'user0': {
'dtrain': [...],
'dvalid': [...],
},...,
'dtest': [...]
}
"""
Run the file ./generate_fedtask.py
to get the splited dataset (.json file).
Since the task-specified models are usually orthogonal to the FL algorithms, we don't consider it an important part in this system. And the model and the basic loss function are defined in ./task/dataset_name/model_name.py
. Further details are described in fedtask/README.md
.
Algorithm
This module is the specific federated learning algorithm implementation. Each method contains two classes: the Server
and the Client
.
Server
The whole FL system starts with the main.py
, which runs server.run()
after initialization. Then the server repeat the method iterate()
for num_rounds
times, which simulates the communication process in FL. In the iterate()
, the BaseServer
start with sampling clients by select()
, and then exchanges model parameters with them by communicate()
, and finally aggregate the different models into a new one with aggregate()
. Therefore, anyone who wants to customize its own method that specifies some operations on the server-side should rewrite the method iterate()
and particular methods mentioned above.
Client
The clients reponse to the server after the server communicate_with()
them, who first unpack()
the received package and then train the model with their local dataset by train()
. After training the model, the clients pack()
send package (e.g. parameters, loss, gradient,... ) to the server through reply()
.
Further details of this module are described in algorithm/README.md
.
Utils
Utils is composed of commonly used operations: model-level operation (we convert model layers and parameters to dictionary type and apply it in the whole FL system), the flow controlling of the framework in and the supporting visualization templates to the result. To visualize the results, please run ./utils/result_analysis.py
. Further details are described in utils/README.md
.
Remark
- Since we've made great changes on the latest version, to fully reproduce the reported results in our paper Federated Learning with Fair Averaging, please use another branch
easyFL v1.0
of this project.
FedRME
- A realization of federated learning algorithm on Road Markings Extraction from Mobile LiDAR Point Clouds (FedRME, https://fanxlxmu.github.io/publication/paper/CSCWD22-FedRME.pdf) was accepted by 2022 IEEE 25th International Conference on Computer Supported Cooperative Work in Design (IEEE CSCWD 2022). The source code for FedRME will be release as soon as possible.
Citation
Please cite our paper in your publications if this code helps your research.
@article{wang2021federated,
title={Federated Learning with Fair Averaging},
author={Wang, Zheng and Fan, Xiaoliang and Qi, Jianzhong and Wen, Chenglu and Wang, Cheng and Yu, Rongshan},
journal={arXiv preprint arXiv:2104.14937},
year={2021}
}te
Contacts
Zheng Wang, zwang@stu.xmu.edu.cn
Xiaoliang Fan, fanxiaoliang@xmu.edu.cn, https://fanxlxmu.github.io
References
[Wang et al., 2021] Zheng Wang, Xiaoliang Fan, Jianzhong Qi, Chenglu Wen, Cheng Wang and Rongshan Yu. Federated Learning with Fair Averaging. arXiv e-prints, page arXiv:2104.14937, 2021.
[Li et al., 2019] Tian Li, Maziar Sanjabi, and Virginia Smith. Fair resource allocation in federated learning. CoRR, abs/1905.10497, 2019.
[Mohri et al., 2019] Mehryar Mohri, Gary Sivek, and Ananda Theertha Suresh. Agnostic federated learning. CoRR, abs/1902.00146, 2019.
[Huang et al., 2020] Wei Huang, Tianrui Li, Dexian Wang, Shengdong Du, and Junbo Zhang. Fairness and accuracy in federated learning. arXiv e-prints, page arXiv:2012.10069, 2020.