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sse_mcmc_train.py
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sse_mcmc_train.py
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import sys
import os
import torch
import torch.nn as nn
import torch.optim as optim
import torch.nn.functional as F
import torch.backends.cudnn as cudnn
import argparse
import torchvision
import torchvision.transforms as transforms
from torch.autograd import Variable
import numpy as np
import random
import models
from utils import snapshot_data as data
from utils import snapshot_transforms as transforms
parser = argparse.ArgumentParser(description='cSG-MCMC training')
parser.add_argument('--dir', type=str, default=None, required=True, help='path to save checkpoints (default: None)')
parser.add_argument('--data_path', type=str, default=None, required=True, metavar='PATH',
help='path to datasets location (default: None)')
parser.add_argument('--batch_size', type=int, default=64,
help='input batch size for training (default: 64)')
parser.add_argument('--transform', type=str, default='CIFAR100_CSGMCMC')
# let alpha=1 => momentum=0 => SGD
# let alpha=0.05 => Momentum with momentum=0.95
parser.add_argument('--alpha', type=float, default=1,
help='1: SGLD; <1: SGHMC')
parser.add_argument('--device_id',type = int, help = 'device id to use')
parser.add_argument('--num_workers', type=int, default=4)
parser.add_argument('--cycle_epochs',type = int)
parser.add_argument('--cycles',type = int)
parser.add_argument('--max_lr',type = float)
parser.add_argument('--cycle_saves',type = int)
parser.add_argument('--noise_epochs',type = int, default=None)
parser.add_argument('--dataset', type=str)
parser.add_argument('--iter', type=int, required=True)
parser.add_argument('--seed', type=int, default=1, help='random seed (default: 1 - off)')
parser.add_argument('--workers', type=int, default=4)
parser.add_argument('--model', type=str, default=None, required=True)
parser.add_argument('--inject_noise', action='store_true')
parser.add_argument('--wd', type=float, default=5e-4)
parser.add_argument('--cold_restarts', action='store_true')
args = parser.parse_args()
os.makedirs(args.dir, exist_ok=True)
with open(os.path.join(args.dir, 'command.sh'), 'w') as f:
f.write(' '.join(sys.argv))
f.write('\n')
class Logger():
def __init__(self):
self.stdout = sys.stdout # save it because stdout will be replaced
def write(self, message):
self.stdout.write(message)
with open(os.path.join(args.dir, 'stdout_cifar_csgmcmc.log'), 'a') as log:
log.write(message)
self.flush()
def flush(self):
self.stdout.flush()
sys.stdout = Logger()
device_id = args.device_id
use_cuda = torch.cuda.is_available()
if args.seed != 1:
print(f'Using given seed {args.seed}')
torch.manual_seed(args.seed)
np.random.seed(args.seed)
random.seed(args.seed)
loaders, num_classes = data.loaders(args.dataset, args.data_path, args.batch_size, args.num_workers,
getattr(transforms, args.transform).train, getattr(transforms, args.transform).test)
testloader = loaders['test']
trainloader = loaders['train']
net = None
def init_net():
global net
arch = getattr(models, args.model)
net = arch.base(num_classes=num_classes, **arch.kwargs)
if use_cuda:
net.cuda(device_id)
cudnn.benchmark = True
cudnn.deterministic = True
def prior_loss(prior_std):
prior_loss = 0.0
for var in net.parameters():
nn = torch.div(var, prior_std)
prior_loss += torch.sum(nn*nn)
return 0.5*prior_loss
def noise_loss(lr,alpha):
noise_loss = 0.0
noise_std = (2/lr*alpha)**0.5 # because we take grad of this term and multiply the result with lr
for var in net.parameters():
means = torch.zeros(var.size()).cuda(device_id)
noise_loss += torch.sum(var * Variable(torch.normal(means, std = noise_std).cuda(device_id),
requires_grad = False))
return noise_loss
def adjust_learning_rate(optimizer, epoch, batch_idx):
rcounter = epoch*epoch_batches+batch_idx
cos_inner = np.pi * (rcounter % (T // M)) # pi * <iteration of cycle we are on>
cos_inner /= T // M # 0..pi depending on where we are in the cycle
cos_out = np.cos(cos_inner) + 1
lr = 0.5*cos_out*args.max_lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
return lr
def train(epoch):
print('\nEpoch: %d' % epoch)
net.train()
train_loss = 0
correct = 0
total = 0
for batch_idx, (inputs, targets) in enumerate(trainloader):
if use_cuda:
inputs, targets = inputs.cuda(device_id), targets.cuda(device_id)
optimizer.zero_grad()
lr = adjust_learning_rate(optimizer, epoch,batch_idx)
outputs = net(inputs)
if args.inject_noise and (epoch % args.cycle_epochs) + 1 > args.cycle_epochs-args.noise_epochs:
loss_noise = noise_loss(lr,args.alpha)/len(trainloader)
loss = criterion(outputs, targets) + loss_noise
else:
loss = criterion(outputs, targets)
loss.backward()
optimizer.step()
train_loss += loss.item()
_, predicted = torch.max(outputs.data, 1)
total += targets.size(0)
correct += predicted.eq(targets.data).cpu().sum()
print('Train set: Loss %.3f | Acc %.3f%%'
% (train_loss/(batch_idx+1), 100.*float(correct)/total))
def test(epoch):
net.eval()
all_predictions = []
all_targets = []
with torch.no_grad():
test_loss = 0
correct = 0
total = 0
for batch_idx, (inputs, targets) in enumerate(testloader):
if use_cuda:
inputs, targets = inputs.cuda(device_id), targets.cuda(device_id)
outputs = net(inputs)
loss = criterion(outputs, targets)
test_loss += loss.item()
_, predicted = torch.max(outputs.data, 1)
total += targets.size(0)
correct += predicted.eq(targets.data).cpu().sum()
all_predictions.append(F.softmax(outputs, dim=1).cpu().numpy())
all_targets.append(targets.cpu().numpy())
print('Test set: Loss {:.3f} | Acc {:.3f}% ({}/{})\n'.format(
test_loss/len(testloader),
100. * float(correct) / total, correct, total))
all_predictions = np.vstack(all_predictions)
all_targets = np.concatenate(all_targets).astype('int64')
return all_predictions, all_targets
prior_std = 1
epoch_batches = len(trainloader)
M = args.cycles
epochs = args.cycle_epochs * args.cycles
T = epochs*epoch_batches # total number of iterations
criterion = nn.CrossEntropyLoss()
optimizer = None
mt = 0
if args.inject_noise:
method_name = 'cSGLD'
else:
method_name = 'SSE'
for epoch in range(epochs):
if epoch == 0 or (args.cold_restarts and epoch%args.cycle_epochs == 0):
init_net()
optimizer = optim.SGD(net.parameters(), lr=args.max_lr, momentum=1-args.alpha, weight_decay=args.wd)
train(epoch)
preds, targets = test(epoch)
if (epoch % args.cycle_epochs) + 1 > args.cycle_epochs-args.cycle_saves:
print('save!')
net.cpu()
filename = f'{args.dataset}-{method_name}_{args.model}_run_{args.iter}-{mt}.pt'
path = os.path.join(args.dir, filename)
torch.save(net.state_dict(), path)
mt += 1
net.cuda(device_id)