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functions.py
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functions.py
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import time
import torch
import torch.nn.functional as F
import logging
import numpy as np
import matplotlib.pyplot as plt
from utils import compute_eer
from utils import AverageMeter, ProgressMeter, accuracy
plt.switch_backend('agg')
logger = logging.getLogger(__name__)
def train(cfg, model, optimizer, train_loader, val_loader, criterion, architect, epoch, writer_dict, lr_scheduler=None):
batch_time = AverageMeter('Time', ':6.3f')
data_time = AverageMeter('Data', ':6.3f')
losses = AverageMeter('Loss', ':.4e')
top1 = AverageMeter('Acc@1', ':6.2f')
top5 = AverageMeter('Acc@5', ':6.2f')
alpha_entropies = AverageMeter('Entropy', ':.4e')
progress = ProgressMeter(
len(train_loader), batch_time, data_time, losses, top1, top5, alpha_entropies,
prefix="Epoch: [{}]".format(epoch), logger=logger)
writer = writer_dict['writer']
# switch to train mode
model.train()
end = time.time()
for i, (input, target) in enumerate(train_loader):
global_steps = writer_dict['train_global_steps']
if lr_scheduler:
current_lr = lr_scheduler.set_lr(optimizer, global_steps, epoch)
else:
current_lr = cfg.TRAIN.LR
# measure data loading time
data_time.update(time.time() - end)
input = input.cuda(non_blocking=True)
target = target.cuda(non_blocking=True)
input_search, target_search = next(iter(val_loader))
input_search = input_search.cuda(non_blocking=True)
target_search = target_search.cuda(non_blocking=True)
# step architecture
architect.step(input_search, target_search)
alpha_entropy = architect.model.compute_arch_entropy()
alpha_entropies.update(alpha_entropy.mean(), input.size(0))
# compute output
output = model(input)
# measure accuracy and record loss
acc1, acc5 = accuracy(output, target, topk=(1, 5))
top1.update(acc1[0], input.size(0))
top5.update(acc5[0], input.size(0))
loss = criterion(output, target)
losses.update(loss.item(), input.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# write to logger
writer.add_scalar('lr', current_lr, global_steps)
writer.add_scalar('train_loss', losses.val, global_steps)
writer.add_scalar('arch_entropy', alpha_entropies.val, global_steps)
writer_dict['train_global_steps'] = global_steps + 1
# log acc for cross entropy loss
writer.add_scalar('train_acc1', top1.val, global_steps)
writer.add_scalar('train_acc5', top5.val, global_steps)
if i % cfg.PRINT_FREQ == 0:
progress.print(i)
def train_from_scratch(cfg, model, optimizer, train_loader, criterion, epoch, writer_dict, lr_scheduler=None):
batch_time = AverageMeter('Time', ':6.3f')
data_time = AverageMeter('Data', ':6.3f')
losses = AverageMeter('Loss', ':.4e')
top1 = AverageMeter('Acc@1', ':6.2f')
top5 = AverageMeter('Acc@5', ':6.2f')
progress = ProgressMeter(
len(train_loader), batch_time, data_time, losses, top1, top5, prefix="Epoch: [{}]".format(epoch), logger=logger)
writer = writer_dict['writer']
# switch to train mode
model.train()
end = time.time()
for i, (input, target) in enumerate(train_loader):
global_steps = writer_dict['train_global_steps']
if lr_scheduler:
current_lr = lr_scheduler.get_lr()
else:
current_lr = cfg.TRAIN.LR
# measure data loading time
data_time.update(time.time() - end)
input = input.cuda(non_blocking=True)
target = target.cuda(non_blocking=True)
# compute output
output = model(input)
# measure accuracy and record loss
loss = criterion(output, target)
acc1, acc5 = accuracy(output, target, topk=(1, 5))
top1.update(acc1[0], input.size(0))
top5.update(acc5[0], input.size(0))
losses.update(loss.item(), input.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# write to logger
writer.add_scalar('lr', current_lr, global_steps)
writer.add_scalar('train_loss', losses.val, global_steps)
writer_dict['train_global_steps'] = global_steps + 1
# log acc for cross entropy loss
writer.add_scalar('train_acc1', top1.val, global_steps)
writer.add_scalar('train_acc5', top5.val, global_steps)
if i % cfg.PRINT_FREQ == 0:
progress.print(i)
def validate_verification(cfg, model, test_loader):
batch_time = AverageMeter('Time', ':6.3f')
progress = ProgressMeter(
len(test_loader), batch_time, prefix='Test: ', logger=logger)
# switch to evaluate mode
model.eval()
labels, distances = [], []
with torch.no_grad():
end = time.time()
for i, (input1, input2, label) in enumerate(test_loader):
input1 = input1.cuda(non_blocking=True).squeeze(0)
input2 = input2.cuda(non_blocking=True).squeeze(0)
label = label.cuda(non_blocking=True)
# compute output
outputs1 = model(input1).mean(dim=0).unsqueeze(0)
outputs2 = model(input2).mean(dim=0).unsqueeze(0)
dists = F.cosine_similarity(outputs1, outputs2)
dists = dists.data.cpu().numpy()
distances.append(dists)
labels.append(label.data.cpu().numpy())
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % 2000 == 0:
progress.print(i)
labels = np.array([sublabel for label in labels for sublabel in label])
distances = np.array([subdist for dist in distances for subdist in dist])
eer = compute_eer(distances, labels)
logger.info('Test EER: {:.8f}'.format(np.mean(eer)))
return eer
def validate_identification(cfg, model, test_loader, criterion):
batch_time = AverageMeter('Time', ':6.3f')
losses = AverageMeter('Loss', ':.4e')
top1 = AverageMeter('Acc@1', ':6.2f')
top5 = AverageMeter('Acc@5', ':6.2f')
progress = ProgressMeter(
len(test_loader), batch_time, losses, top1, top5, prefix='Test: ', logger=logger)
# switch to evaluate mode
model.eval()
with torch.no_grad():
end = time.time()
for i, (input, target) in enumerate(test_loader):
input = input.cuda(non_blocking=True).squeeze(0)
target = target.cuda(non_blocking=True)
# compute output
output = model(input)
output = torch.mean(output, dim=0, keepdim=True)
output = model.forward_classifier(output)
acc1, acc5 = accuracy(output, target, topk=(1, 5))
top1.update(acc1[0], input.size(0))
top5.update(acc5[0], input.size(0))
loss = criterion(output, target)
losses.update(loss.item(), 1)
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % 2000 == 0:
progress.print(i)
logger.info('Test Acc@1: {:.8f} Acc@5: {:.8f}'.format(top1.avg, top5.avg))
return top1.avg