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solver.py
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solver.py
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import glob
import os
import numpy as np
import torch
from nn_common_modules import losses as additional_losses
from torch.optim import lr_scheduler
import utils.common_utils as common_utils
from utils.log_utils import LogWriter
CHECKPOINT_DIR = 'checkpoints'
CHECKPOINT_EXTENSION = 'pth.tar'
class Solver(object):
def __init__(self,
model,
exp_name,
device,
num_class,
optim=torch.optim.Adam,
optim_args={},
loss_func=additional_losses.CombinedLoss(),
model_name='quicknat',
labels=None,
num_epochs=10,
log_nth=5,
lr_scheduler_step_size=5,
lr_scheduler_gamma=0.5,
use_last_checkpoint=True,
exp_dir='experiments',
log_dir='logs'):
self.device = device
self.model = model
self.model_name = model_name
self.labels = labels
self.num_epochs = num_epochs
if torch.cuda.is_available():
self.loss_func = loss_func.cuda(device)
else:
self.loss_func = loss_func
self.optim = optim(model.parameters(), **optim_args)
self.scheduler = lr_scheduler.StepLR(self.optim, step_size=lr_scheduler_step_size,
gamma=lr_scheduler_gamma)
exp_dir_path = os.path.join(exp_dir, exp_name)
common_utils.create_if_not(exp_dir_path)
common_utils.create_if_not(os.path.join(exp_dir_path, CHECKPOINT_DIR))
self.exp_dir_path = exp_dir_path
self.log_nth = log_nth
self.logWriter = LogWriter(num_class, log_dir, exp_name, use_last_checkpoint, labels)
self.use_last_checkpoint = use_last_checkpoint
self.start_epoch = 1
self.start_iteration = 1
self.best_ds_mean = 0
self.best_ds_mean_epoch = 0
if use_last_checkpoint:
self.load_checkpoint()
# TODO:Need to correct the CM and dice score calculation.
def train(self, train_loader, val_loader):
"""
Train a given model with the provided data.
Inputs:
- train_loader: train data in torch.utils.data.DataLoader
- val_loader: val data in torch.utils.data.DataLoader
"""
model, optim, scheduler = self.model, self.optim, self.scheduler
dataloaders = {
'train': train_loader,
'val': val_loader
}
if torch.cuda.is_available():
torch.cuda.empty_cache()
model.cuda(self.device)
print('START TRAINING. : model name = %s, device = %s' % (
self.model_name, torch.cuda.get_device_name(self.device)))
current_iteration = self.start_iteration
for epoch in range(self.start_epoch, self.num_epochs + 1):
print("\n==== Epoch [ %d / %d ] START ====" % (epoch, self.num_epochs))
for phase in ['train', 'val']:
print("<<<= Phase: %s =>>>" % phase)
loss_arr = []
out_list = []
y_list = []
if phase == 'train':
model.train()
scheduler.step()
else:
model.eval()
for i_batch, sample_batched in enumerate(dataloaders[phase]):
X = sample_batched[0].type(torch.FloatTensor)
y = sample_batched[1].type(torch.LongTensor)
w = sample_batched[2].type(torch.FloatTensor)
if model.is_cuda:
X, y, w = X.cuda(self.device, non_blocking=True), y.cuda(self.device,
non_blocking=True), w.cuda(self.device,
non_blocking=True)
output = model(X)
loss = self.loss_func(output, y, w)
if phase == 'train':
optim.zero_grad()
loss.backward()
optim.step()
if i_batch % self.log_nth == 0:
self.logWriter.loss_per_iter(loss.item(), i_batch, current_iteration)
current_iteration += 1
loss_arr.append(loss.item())
_, batch_output = torch.max(output, dim=1)
out_list.append(batch_output.cpu())
y_list.append(y.cpu())
del X, y, w, output, batch_output, loss
torch.cuda.empty_cache()
if phase == 'val':
if i_batch != len(dataloaders[phase]) - 1:
print("#", end='', flush=True)
else:
print("100%", flush=True)
with torch.no_grad():
out_arr, y_arr = torch.cat(out_list), torch.cat(y_list)
self.logWriter.loss_per_epoch(loss_arr, phase, epoch)
index = np.random.choice(len(dataloaders[phase].dataset.X), 3, replace=False)
self.logWriter.image_per_epoch(model.predict(dataloaders[phase].dataset.X[index], self.device),
dataloaders[phase].dataset.y[index], phase, epoch)
self.logWriter.cm_per_epoch(phase, out_arr, y_arr, epoch)
ds_mean = self.logWriter.dice_score_per_epoch(phase, out_arr, y_arr, epoch)
if phase == 'val':
if ds_mean > self.best_ds_mean:
self.best_ds_mean = ds_mean
self.best_ds_mean_epoch = epoch
print("==== Epoch [" + str(epoch) + " / " + str(self.num_epochs) + "] DONE ====")
self.save_checkpoint({
'epoch': epoch + 1,
'start_iteration': current_iteration + 1,
'arch': self.model_name,
'state_dict': model.state_dict(),
'optimizer': optim.state_dict(),
'scheduler': scheduler.state_dict(),
'best_ds_mean': self.best_ds_mean,
'best_ds_mean_epoch': self.best_ds_mean_epoch
}, os.path.join(self.exp_dir_path, CHECKPOINT_DIR,
'checkpoint_epoch_' + str(epoch) + '.' + CHECKPOINT_EXTENSION))
print('FINISH.')
self.logWriter.close()
def save_best_model(self, path):
"""
Save model with its parameters to the given path. Conventionally the
path should end with "*.model".
Inputs:
- path: path string
"""
print('Saving model... %s' % path)
print('Best Model at Epoch: ' + str(self.best_ds_mean_epoch))
self.load_checkpoint(self.best_ds_mean_epoch)
torch.save(self.model, path)
def save_checkpoint(self, state, filename):
torch.save(state, filename)
def load_checkpoint(self, epoch=None):
if epoch is not None:
checkpoint_path = os.path.join(self.exp_dir_path, CHECKPOINT_DIR,
'checkpoint_epoch_' + str(epoch) + '.' + CHECKPOINT_EXTENSION)
self._load_checkpoint_file(checkpoint_path)
else:
all_files_path = os.path.join(self.exp_dir_path, CHECKPOINT_DIR, '*.' + CHECKPOINT_EXTENSION)
list_of_files = glob.glob(all_files_path)
if len(list_of_files) > 0:
checkpoint_path = max(list_of_files, key=os.path.getctime)
self._load_checkpoint_file(checkpoint_path)
else:
self.logWriter.log(
"=> no checkpoint found at '{}' folder".format(os.path.join(self.exp_dir_path, CHECKPOINT_DIR)))
def _load_checkpoint_file(self, file_path):
self.logWriter.log("=> loading checkpoint '{}'".format(file_path))
checkpoint = torch.load(file_path)
self.start_epoch = checkpoint['epoch']
self.start_iteration = checkpoint['start_iteration']
self.model.load_state_dict(checkpoint['state_dict'])
self.optim.load_state_dict(checkpoint['optimizer'])
if 'best_ds_mean' in checkpoint.keys():
self.best_ds_mean = checkpoint['best_ds_mean']
self.best_ds_mean_epoch = checkpoint['best_ds_mean_epoch']
for state in self.optim.state.values():
for k, v in state.items():
if torch.is_tensor(v):
state[k] = v.to(self.device)
self.scheduler.load_state_dict(checkpoint['scheduler'])
self.logWriter.log("=> loaded checkpoint '{}' (epoch {})".format(file_path, checkpoint['epoch']))