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ditto.py
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ditto.py
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import random
import copy
import time
import math
import numpy as np
import torch
import torch.optim as optim
from ditto.config import get_args
from model import simplecnn, textcnn
from test import compute_local_test_accuracy, compute_acc
from prepare_data import get_dataloader
from attack import *
def local_train_fedavg(args, nets_this_round, p_models, train_local_dls, val_local_dls, test_dl, data_distributions, best_val_acc_list, best_test_acc_list, benign_client_list):
for net_id, net in nets_this_round.items():
vnet = p_models[net_id]
train_local_dl = train_local_dls[net_id]
data_distribution = data_distributions[net_id]
# Pre-Trainging Test Accuracy
optimizer = torch.optim.SGD(filter(lambda p: p.requires_grad, net.parameters()), lr=args.lr, momentum=0.9, weight_decay=args.reg)
poptimizer = torch.optim.SGD(filter(lambda p: p.requires_grad, vnet.parameters()), lr = args.lr, momentum=0.9, weight_decay=args.reg)
criterion = torch.nn.CrossEntropyLoss().cuda()
net.cuda()
net.train()
vnet.cuda()
vnet.train()
iterator = iter(train_local_dl)
for iteration in range(args.num_local_iterations):
try:
x, target = next(iterator)
except StopIteration:
iterator = iter(train_local_dl)
x, target = next(iterator)
x, target = x.cuda(), target.cuda()
poptimizer.zero_grad()
target = target.long()
out = vnet(x)
loss = criterion(out, target)
for param_p, param in zip(vnet.parameters(), net.parameters()):
loss += ((args.lamda / 2) * torch.norm((param - param_p)) ** 2)
loss.backward()
poptimizer.step()
for iteration in range(args.num_local_iterations):
try:
x, target = next(iterator)
except StopIteration:
iterator = iter(train_local_dl)
x, target = next(iterator)
x, target = x.cuda(), target.cuda()
optimizer.zero_grad()
target = target.long()
out = net(x)
loss = criterion(out, target)
loss.backward()
optimizer.step()
if net_id in benign_client_list:
val_acc = compute_acc(vnet, val_local_dls[net_id])
personalized_test_acc, generalized_test_acc = compute_local_test_accuracy(vnet, test_dl, data_distribution)
if val_acc > best_val_acc_list[net_id]:
best_val_acc_list[net_id] = val_acc
best_test_acc_list[net_id] = personalized_test_acc
print('>> Client {} | Personalized Test Acc: ({:.5f}) | Generalized Test Acc: {:.5f}'.format(net_id, personalized_test_acc, generalized_test_acc))
net.to('cpu')
vnet.to('cpu')
return np.array(best_test_acc_list)[np.array(benign_client_list)].mean()
args, cfg = get_args()
print(args)
seed = args.init_seed
np.random.seed(seed)
torch.manual_seed(seed)
if torch.cuda.is_available():
torch.cuda.manual_seed(seed)
random.seed(seed)
n_party_per_round = int(args.n_parties * args.sample_fraction)
party_list = [i for i in range(args.n_parties)]
party_list_rounds = []
if n_party_per_round != args.n_parties:
for i in range(args.comm_round):
party_list_rounds.append(random.sample(party_list, n_party_per_round))
else:
for i in range(args.comm_round):
party_list_rounds.append(party_list)
benign_client_list = random.sample(party_list, int(args.n_parties * (1-args.attack_ratio)))
benign_client_list.sort()
print(f'>> -------- Benign clients: {benign_client_list} --------')
train_local_dls, val_local_dls, test_dl, net_dataidx_map, traindata_cls_counts, data_distributions = get_dataloader(args)
if args.dataset == 'cifar10':
model = simplecnn
elif args.dataset == 'cifar100':
model = simplecnn
elif args.dataset == 'yahoo_answers':
model = textcnn
global_model = model(cfg['classes_size'])
global_parameters = global_model.state_dict()
local_models = []
p_models = []
best_val_acc_list, best_test_acc_list = [],[]
for i in range(args.n_parties):
local_models.append(model(cfg['classes_size']))
p_models.append(model(cfg['classes_size']))
best_val_acc_list.append(0)
best_test_acc_list.append(0)
for round in range(args.comm_round): # Federated round loop
party_list_this_round = party_list_rounds[round]
if args.sample_fraction<1.0:
print(f'>> Clients in this round : {party_list_this_round}')
global_w = global_model.state_dict() # Global Model Initialization
nets_this_round = {k: local_models[k] for k in party_list_this_round}
for net in nets_this_round.values():
net.load_state_dict(global_w)
# Local Model Training
mean_personalized_acc = local_train_fedavg(args, nets_this_round, p_models, train_local_dls, val_local_dls, test_dl, data_distributions, best_val_acc_list, best_test_acc_list, benign_client_list)
# Aggregation Weight Calculation
total_data_points = sum([len(net_dataidx_map[r]) for r in party_list_this_round])
fed_avg_freqs = [len(net_dataidx_map[r]) / total_data_points for r in party_list_this_round]
if round==0 or args.sample_fraction<1.0:
print(f'Dataset size weight : {fed_avg_freqs}')
manipulate_gradient(args, global_model, nets_this_round, benign_client_list)
# Model Aggregation
for net_id, net in enumerate(nets_this_round.values()):
net_para = net.state_dict()
if net_id == 0:
for key in net_para:
global_w[key] = net_para[key] * fed_avg_freqs[net_id]
else:
for key in net_para:
global_w[key] += net_para[key] * fed_avg_freqs[net_id]
global_model.load_state_dict(global_w) # Update the global model
print('>> (Current) Round {} | Local Per: {:.5f}'.format(round, mean_personalized_acc))
print('-'*80)