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main.py
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main.py
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#!/usr/bin/env python3
import argparse
import json
import os
import time
import copy
import random
from collections import defaultdict
import numpy as np
import torch
import torch.nn.functional as F
import torch.optim as optim
from IPython import embed
import models
import datasets
from utils import *
from logger import Logger
def adjust_learning_rate(optimizer, epoch):
if args.step_size is not None:lr = args.lr * 0.1 ** (epoch//args.step_size)
else:lr = args.lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
def l2_penalty(model,model_init,weight_decay):
l2_loss = 0
for (k,p),(k_init,p_init) in zip(model.named_parameters(),model_init.named_parameters()):
if p.requires_grad:
l2_loss += (p-p_init).pow(2).sum()
l2_loss *= (weight_decay/2.)
return l2_loss
def run_epoch(args, model, model_init, train_loader, criterion=torch.nn.CrossEntropyLoss(), optimizer=None, scheduler=None, epoch=0, weight_decay=0.0, mode='train'):
if mode == 'train':
model.train()
elif mode == 'test':
model.eval()
elif mode == 'dry_run':
model.eval()
set_batchnorm_mode(model, train=True)
else:
raise ValueError("Invalid mode.")
if args.disable_bn:
set_batchnorm_mode(model, train=False)
mult=0.5 if args.lossfn=='mse' else 1
metrics = AverageMeter()
with torch.set_grad_enabled(mode != 'test'):
for batch_idx, (data, target) in enumerate(train_loader):
data, target = data.to(args.device), target.to(args.device)
if args.lossfn=='mse':
target=(2*target-1)
target = target.type(torch.cuda.FloatTensor).unsqueeze(1)
if 'mnist' in args.dataset:
data=data.view(data.shape[0],-1)
output = model(data)
loss = mult*criterion(output, target) + l2_penalty(model,model_init,weight_decay)
if args.l1:
l1_loss = sum([p.norm(1) for p in model.parameters()])
loss += args.weight_decay * l1_loss
metrics.update(n=data.size(0), loss=loss.item(), error=get_error(output, target))
if mode == 'train':
optimizer.zero_grad()
loss.backward()
optimizer.step()
log_metrics(mode, metrics, epoch)
logger.append('train' if mode=='train' else 'test', epoch=epoch, loss=metrics.avg['loss'], error=metrics.avg['error'],
lr=optimizer.param_groups[0]['lr'])
print('Learning Rate : {}'.format(optimizer.param_groups[0]['lr']))
return metrics
if __name__ == '__main__':
# Training settings
parser = argparse.ArgumentParser()
parser.add_argument('--augment', action='store_true', default=False,
help='Use data augmentation')
parser.add_argument('--batch-size', type=int, default=128, metavar='N',
help='input batch size for training (default: 128)')
parser.add_argument('--dataset', default='mnist')
parser.add_argument('--disable-bn', action='store_true', default=False,
help='Put batchnorm in eval mode and don\'t update the running averages')
parser.add_argument('--epochs', type=int, default=31, metavar='N',
help='number of epochs to train (default: 31)')
parser.add_argument('--filters', type=float, default=1.0,
help='Percentage of filters')
parser.add_argument('--forget-class', type=int, default=None,
help='Class to forget')
parser.add_argument('--l1', action='store_true', default=False,
help='uses L1 regularizer instead of L2')
parser.add_argument('--lossfn', type=str, default='ce',
help='Cross Entropy: ce or mse')
parser.add_argument('--lr', type=float, default=0.01, metavar='LR',
help='learning rate (default: 0.01)')
parser.add_argument('--model', default='mlp')
parser.add_argument('--momentum', type=float, default=0.9, metavar='M',
help='SGD momentum (default: 0.9)')
parser.add_argument('--no-cuda', action='store_true', default=False,
help='disables CUDA training')
parser.add_argument('--num-classes', type=int, default=None,
help='Number of Classes')
parser.add_argument('--num-to-forget', type=int, default=None,
help='Number of samples of class to forget')
parser.add_argument('--name', default=None)
parser.add_argument('--resume', type=str, default=None,
help='Checkpoint to resume')
parser.add_argument('--seed', type=int, default=1, metavar='S',
help='random seed (default: 1)')
parser.add_argument('--step-size', default=None, type=int, help='learning rate scheduler')
parser.add_argument('--unfreeze-start', default=None, type=str, help='All layers are freezed except the final layers starting from unfreeze-start')
parser.add_argument('--weight-decay', type=float, default=0.0005, metavar='M',
help='Weight decay (default: 0.0005)')
args = parser.parse_args()
manual_seed(args.seed)
if args.step_size==None:args.step_size=args.epochs+1
if args.name is None:
args.name = f"{args.dataset}_{args.model}_{str(args.filters).replace('.','_')}_forget_{args.forget_class}"
if args.num_to_forget is not None:
args.name += f"_num_{args.num_to_forget}"
if args.unfreeze_start is not None:
args.name += f"_unfreeze_from_{args.unfreeze_start.replace('.','_')}"
if args.augment:
args.name += f"_augment"
args.name+=f"_lr_{str(args.lr).replace('.','_')}"
args.name+=f"_bs_{str(args.batch_size)}"
args.name+=f"_ls_{args.lossfn}"
args.name+=f"_wd_{str(args.weight_decay).replace('.','_')}"
args.name+=f"_seed_{str(args.seed)}"
print(f'Checkpoint name: {args.name}')
mkdir('logs')
logger = Logger(index=args.name+'_training')
logger['args'] = args
logger['checkpoint'] = os.path.join('models/', logger.index+'.pth')
logger['checkpoint_step'] = os.path.join('models/', logger.index+'_{}.pth')
print("[Logging in {}]".format(logger.index))
use_cuda = not args.no_cuda and torch.cuda.is_available()
args.device = torch.device("cuda" if use_cuda else "cpu")
os.makedirs('checkpoints', exist_ok=True)
train_loader, valid_loader, test_loader = datasets.get_loaders(args.dataset, class_to_replace=args.forget_class,
num_indexes_to_replace=args.num_to_forget,
batch_size=args.batch_size, seed=args.seed, augment=args.augment)
num_classes = max(train_loader.dataset.targets) + 1 if args.num_classes is None else args.num_classes
args.num_classes = num_classes
print(f"Number of Classes: {num_classes}")
model = models.get_model(args.model, num_classes=num_classes, filters_percentage=args.filters).to(args.device)
if args.model=='allcnn':classifier_name='classifier.'
elif 'resnet' in args.model:classifier_name='linear.'
if args.resume is not None:
state = torch.load(args.resume)
state = {k: v for k, v in state.items() if not k.startswith(classifier_name)}
incompatible_keys = model.load_state_dict(state, strict=False)
assert all([k.startswith(classifier_name) for k in incompatible_keys.missing_keys])
model_init = copy.deepcopy(model)
torch.save(model.state_dict(), f"checkpoints/{args.name}_init.pt")
parameters = model.parameters()
if args.unfreeze_start is not None:
parameters = []
layer_index = 1e8
for i, (n,p) in enumerate(model.named_parameters()):
if (args.unfreeze_start in n) or (i > layer_index):
layer_index = i
parameters.append(p)
weight_decay = args.weight_decay if not args.l1 else 0.
optimizer = optim.SGD(parameters, lr=args.lr, momentum=args.momentum, weight_decay=0.0)
scheduler = torch.optim.lr_scheduler.StepLR(optimizer, args.step_size, gamma=0.1, last_epoch=-1)
criterion = torch.nn.CrossEntropyLoss().to(args.device) if args.lossfn=='ce' else torch.nn.MSELoss().to(args.device)
for epoch in range(args.epochs):
adjust_learning_rate(optimizer,epoch)
t1 = time.time()
run_epoch(args, model, model_init, train_loader, criterion, optimizer, scheduler, epoch, weight_decay, mode='train')
# run_epoch(args, model, model_init, train_loader, criterion, optimizer, scheduler, epoch, weight_decay, mode='test')
if epoch % 5 == 0:
if not args.disable_bn:
run_epoch(args, model, model_init, train_loader, criterion, optimizer, scheduler, epoch, weight_decay, mode='dry_run')
run_epoch(args, model, model_init, test_loader, criterion, optimizer, scheduler, epoch, weight_decay, mode='test')
if epoch % 1 == 0:
torch.save(model.state_dict(), f"checkpoints/{args.name}_{epoch}.pt")
print(f'Epoch Time: {np.round(time.time()-t1,2)} sec')
# if __name__ == '__main__':
# main()