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train_tinyimgnet.py
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train_tinyimgnet.py
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import torch, torchvision
import torch.nn as nn
import torch.optim as optim
from torch.optim import lr_scheduler
import torchvision.datasets as datasets
import torch.utils.data as data
import torchvision.transforms as transforms
from torch.autograd import Variable
import torchvision.models as models
import matplotlib.pyplot as plt
import time, os, copy, numpy as np
from livelossplot import PlotLosses
import datetime
import sys
import splinecam
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('--log_filename', type=str,
help='unique filename for experiments',
default=str(datetime.datetime.now()).replace(' ','-'))
parser.add_argument('--epochs', type=int,default=20)
parser.add_argument('--ngpus', type=int, help='number of gpus to use for training', default=1)
parser.add_argument('--lr', type=float, default=0.003)
parser.add_argument('--batch_size', type=int, default=128)
parser.add_argument('--model_name', type=str, default='vgg11')
params = parser.parse_args()
def train_model(model, dataloaders, dataset_sizes, criterion, optimizer, scheduler,
num_epochs=25, return_best_val=False):
device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
since = time.time()
liveloss = PlotLosses()
if return_best_val:
best_model_wts = copy.deepcopy(model.state_dict())
best_acc = 0.0
for epoch in range(num_epochs):
print('Epoch {}/{}'.format(epoch+1, num_epochs))
print('-' * 10)
# Each epoch has a training and validation phase
for phase in ['train', 'val']:
if phase == 'train':
scheduler.step()
model.train() # Set model to training mode
else:
model.eval() # Set model to evaluate mode
running_loss = 0.0
running_corrects = 0
# Iterate over data.
for i,(inputs, labels) in enumerate(dataloaders[phase]):
inputs = inputs.to(device)
labels = labels.to(device)
# zero the parameter gradients
optimizer.zero_grad()
# forward
# track history if only in train
with torch.set_grad_enabled(phase == 'train'):
outputs = model(inputs)
_, preds = torch.max(outputs, 1)
loss = criterion(outputs, labels)
# backward + optimize only if in training phase
if phase == 'train':
loss.backward()
optimizer.step()
# statistics
running_loss += loss.item() * inputs.size(0)
running_corrects += torch.sum(preds == labels.data)
print("\rIteration: {}/{}, Loss: {}.".format(i+1, len(dataloaders[phase]), loss.item() * inputs.size(0)), end="")
# print( (i+1)*100. / len(dataloaders[phase]), "% Complete" )
sys.stdout.flush()
epoch_loss = running_loss / dataset_sizes[phase]
epoch_acc = running_corrects.double() / dataset_sizes[phase]
if phase == 'train':
avg_loss = epoch_loss
t_acc = epoch_acc
else:
val_loss = epoch_loss
val_acc = epoch_acc
# print('{} Loss: {:.4f} Acc: {:.4f}'.format(
# phase, epoch_loss, epoch_acc))
# deep copy the model
if phase == 'val' and epoch_acc > best_acc:
best_acc = epoch_acc
if return_best_val:
best_model_wts = copy.deepcopy(model.state_dict())
liveloss.update({
'log loss': avg_loss,
'val_log loss': val_loss,
'accuracy': t_acc.cpu(),
'val_accuracy': val_acc.cpu()
})
liveloss.draw()
print('Train Loss: {:.4f} Acc: {:.4f}'.format(avg_loss, t_acc))
print( 'Val Loss: {:.4f} Acc: {:.4f}'.format(val_loss, val_acc))
print('Best Val Accuracy: {}'.format(best_acc))
print()
time_elapsed = time.time() - since
print('Training complete in {:.0f}m {:.0f}s'.format(
time_elapsed // 60, time_elapsed % 60))
print('Best val Acc: {:4f}'.format(best_acc))
# load best model weights
if return_best_val:
model.load_state_dict(best_model_wts)
return model
data_transforms = { 'train': transforms.Compose([transforms.ToTensor()]),
'val' : transforms.Compose([transforms.ToTensor(),]) }
data_dir = './data/tiny-imagenet-200/'
image_datasets = {x: datasets.ImageFolder(os.path.join(data_dir, x), data_transforms[x])
for x in ['train', 'val']}
dataloaders = {x: torch.utils.data.DataLoader(image_datasets[x], batch_size=params.batch_size, shuffle=True, pin_memory=True,
num_workers=24, drop_last=False)
for x in ['train', 'val']}
dataset_sizes = {x: len(image_datasets[x]) for x in ['train', 'val']}
if params.model_name == 'vgg11':
model_ft = splinecam.models.vgg11_bn(input_res=64,n_class=200)
elif params.model_name == 'vgg16':
model_ft = splinecam.models.vgg16_bn(input_res=64,n_class=200)
device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
model_ft = model_ft.to(device)
#Multi GPU
if params.ngpus > 1:
model_ft = torch.nn.DataParallel(model_ft,
device_ids=list(range(params.ngpus))
)
criterion = nn.CrossEntropyLoss()
# Observe that all parameters are being optimized
optimizer_ft = optim.Adam(model_ft.parameters(), lr=params.lr)
# Decay LR by a factor of 0.1 every 7 epochs
exp_lr_scheduler = lr_scheduler.StepLR(optimizer_ft, step_size=7, gamma=0.1)
print('training...')
model_ft = train_model(model_ft, dataloaders, dataset_sizes, criterion, optimizer_ft, exp_lr_scheduler,
num_epochs=params.epochs,return_best_val=False)
torch.save(model_ft,f'./models/tinyimagenet_{params.model_name}_{params.log_filename}.pt')