def train(trainloader,
model,
criterion,
optimizer,
epoch,
cuda=False,
compute_step_variance=False):
# switch to train mode
model.train()
batch_time = AverageMeter()
data_time = AverageMeter()
losses = AverageMeter()
top1 = AverageMeter()
top5 = AverageMeter()
end = time.time()
for batch_idx, (inputs, targets) in enumerate(trainloader):
# measure data loading time
data_time.update(time.time() - end)
# found this that suggest changing `async` to `non_blocking`: https://github.com/quark0/darts/pull/25
if cuda:
inputs, targets = inputs.cuda(), targets.cuda(non_blocking=True)
# compute output
outputs = model(inputs)
loss = criterion(outputs, targets)
# measure accuracy and record loss
prec1, prec5 = accuracy(outputs.data, targets.data, topk=(1, 5))
losses.update(loss.item(), inputs.size(0))
top1.update(prec1.item(), inputs.size(0))
top5.update(prec5.item(), inputs.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()
# plot progress
progress_str = 'Loss: %.3f | Acc: %.3f%% (%d/%d)'\
% (losses.avg, top1.avg, top1.sum, top1.count)
progress_bar(batch_idx, len(trainloader), progress_str)
iteration = epoch * len(trainloader) + batch_idx
track.metric(iteration=iteration,
epoch=epoch,
avg_train_loss=losses.avg,
avg_train_acc=top1.avg,
cur_train_loss=loss.item(),
cur_train_acc=prec1.item())
return (losses.avg, top1.avg)
def tsne_embeddings(vecs, train_iters, batch_size, perplexity=30, cuda=False):
track.debug("[track]\tComputing image densities PMF")
densities = _compute_densities(vecs, perplexity=perplexity)
i, j = np.indices(densities.shape)
i = i.ravel()
j = j.ravel()
track.debug("[track]\tTraining the TSNE embedding")
tsne = TSNE(len(densities), 2, 2) # visualize in 2d
tsne_train_wrapper = Wrapper(tsne, batchsize=batch_size, cuda=cuda)
for k in range(train_iters):
# plot progress
progress_bar(k, train_iters)
tsne_train_wrapper.fit(densities, i, j)
return tsne.logits.weight.detach().cpu().numpy()
def test(testloader, model, criterion, epoch, cuda=False):
batch_time = AverageMeter()
data_time = AverageMeter()
losses = AverageMeter()
top1 = AverageMeter()
top5 = AverageMeter()
# switch to evaluate mode
model.eval()
end = time.time()
with torch.no_grad():
for batch_idx, (inputs, targets) in enumerate(testloader):
# measure data loading time
data_time.update(time.time() - end)
if cuda:
inputs, targets = inputs.cuda(), targets.cuda()
inputs = torch.autograd.Variable(inputs, volatile=True)
targets = torch.autograd.Variable(targets, volatile=True)
# compute output
outputs = model(inputs)
loss = criterion(outputs, targets)
# measure accuracy and record loss
prec1, prec5 = accuracy(outputs.data, targets.data, topk=(1, 5))
losses.update(loss.item(), inputs.size(0))
top1.update(prec1.item(), inputs.size(0))
top5.update(prec5.item(), inputs.size(0))
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# plot progress
progress_str = 'Loss: %.3f | Acc: %.3f%% (%d/%d)'\
% (losses.avg, top1.avg, top1.sum, top1.count)
progress_bar(batch_idx, len(testloader), progress_str)
track.metric(iteration=0,
epoch=epoch,
avg_test_loss=losses.avg,
avg_test_acc=top1.avg)
return (losses.avg, top1.avg)
def train(trainloader, model, optimizer, epoch, cuda=True):
# switch to train mode
model.train()
hyperparameters = model.hp
mode = model.mode
if type(model) is nn.DataParallel:
inp_dim = model.module.inp_dim
pw_ph = model.module.pw_ph
cx_cy = model.module.cx_cy
stride = model.module.stride
else:
inp_dim = model.inp_dim
pw_ph = model.pw_ph
cx_cy = model.cx_cy
stride = model.stride
if cuda:
pw_ph = pw_ph.cuda()
cx_cy = cx_cy.cuda()
stride = stride.cuda()
batch_time = AverageMeter()
data_time = AverageMeter()
avg_loss = AverageMeter()
avg_iou = AverageMeter()
avg_conf = AverageMeter()
avg_no_conf = AverageMeter()
avg_pos = AverageMeter()
avg_neg = AverageMeter()
end = time.time()
break_flag = 0
if mode['show_temp_summary'] == True:
writer = SummaryWriter(os.path.join(track.trial_dir(), 'temp_vis/'))
for batch_idx, (inputs, targets) in enumerate(trainloader):
# measure data loading time
data_time.update(time.time() - end)
if cuda:
inputs = inputs.cuda()
# compute output
raw_pred = model(inputs, torch.cuda.is_available())
true_pred = util.transform(raw_pred.clone().detach(), pw_ph, cx_cy,
stride)
iou_list = util.get_iou_list(true_pred, targets, hyperparameters,
inp_dim)
resp_raw_pred, resp_cx_cy, resp_pw_ph, resp_stride, no_obj = util.build_tensors(
raw_pred, iou_list, pw_ph, cx_cy, stride, hyperparameters)
stats = helper.get_progress_stats(true_pred, no_obj, iou_list, targets)
if hyperparameters['wasserstein'] == True:
no_obj = util.get_wasserstein_matrices(raw_pred, iou_list, inp_dim)
try:
loss = util.yolo_loss(resp_raw_pred, targets, no_obj, resp_pw_ph,
resp_cx_cy, resp_stride, inp_dim,
hyperparameters)
except RuntimeError:
print('bayes opt failed')
break_flag = 1
break
# measure accuracy and record loss
avg_loss.update(loss.item())
avg_iou.update(stats['iou'])
avg_conf.update(stats['pos_conf'])
avg_no_conf.update(stats['neg_conf'])
avg_pos.update(stats['pos_class'])
avg_neg.update(stats['neg_class'])
# 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()
if mode['show_output'] == True: # plot progress
progress_str = 'Loss: %.4f | AvIoU: %.3f | AvPConf: %.3f | AvNConf: %.5f | AvClass: %.3f | AvNClass: %.5f'\
% (loss.item(), stats['iou'], stats['pos_conf'], stats['neg_conf'],stats['pos_class'],stats['neg_class'])
progress_bar(batch_idx, len(trainloader), progress_str)
iteration = epoch * len(trainloader) + batch_idx
if mode['show_temp_summary'] == True:
writer.add_scalar('AvLoss/train', avg_loss.avg, iteration)
writer.add_scalar('AvIoU/train', avg_iou.avg, iteration)
writer.add_scalar('AvPConf/train', avg_conf.avg, iteration)
writer.add_scalar('AvNConf/train', avg_no_conf.avg, iteration)
writer.add_scalar('AvClass/train', avg_pos.avg, iteration)
writer.add_scalar('AvNClass/train', avg_neg.avg, iteration)
track.metric(iteration=iteration,
epoch=epoch,
avg_train_loss=avg_loss.avg,
avg_train_iou=avg_iou.avg,
avg_train_conf=avg_conf.avg,
avg_train_neg_conf=avg_no_conf.avg,
avg_train_pos=avg_pos.avg,
avg_train_neg=avg_neg.avg)
outcome = {
'avg_loss': avg_loss.avg,
'avg_iou': avg_iou.avg,
'avg_pos': avg_pos.avg,
'avg_neg': avg_neg.avg,
'avg_conf': avg_conf.avg,
'avg_no_conf': avg_no_conf.avg,
'broken': break_flag
}
return outcome
def run(ensemble, proj_df, dataroot='./data',
batch_size=128, cuda=False,
class_ind=0,
num_batches=4, tsne_train_iters=4000,
**kwargs):
""" let's do some dimensionality reduction """
track.debug("[tsne] starting experiment with class %d" % class_ind)
trainloader, testloader = build_single_class_dataset(
'cifar10',
class_ind=2,
dataroot=dataroot,
batch_size=batch_size,
eval_batch_size=batch_size,
num_workers=2)
# stores for any loader; we have to copy these to the last two dicts
train_activations = {}
labels = []
track.debug("[tsne] starting forward passes")
ensemble.models = ensemble.models[0::4] # plot every 4 epochs for now
for model_ind, model in enumerate(ensemble.models):
# plot progress
progress_bar(model_ind, len(ensemble.models))
model_activations = []
# this hook will aggregate a list of model outputs in `activations`
model.linear.register_forward_pre_hook(
_create_preactivation_hook(model_activations))
with torch.no_grad():
for inputs, _ in islice(trainloader, 0, num_batches):
model(inputs)
train_activations[model_ind] = torch.cat(model_activations)
labels.extend([model_ind] * len(train_activations[model_ind]))
# now, we have all activations for all models! we can do tsne
track.debug("[tsne] forward pass done! starting stacking + embedding")
all_train_activations = torch.cat(
[vec for vec in train_activations.values()])
embedding = tsne_embeddings(all_train_activations,
tsne_train_iters,
batch_size=len(all_train_activations),
cuda=cuda)
f = plt.figure()
# create labels for the models by iteration
y = np.array(labels)
plt.scatter(embedding[:, 0], embedding[:, 1], c=y * 1.0 / y.max())
# plot the model means too
model_means = []
num_model_vecs = len(list(train_activations.values())[0])
endpoints = []
start = 0
for stop in range(0, len(embedding), num_model_vecs):
if stop - start > 0:
endpoints.append((start, stop))
start = stop
for start, stop in endpoints:
model_means.append(embedding[start:stop, :].mean(axis=0))
model_means = np.array(model_means)
ys = np.array(list(range(len(model_means)))) / float(len(model_means))
plt.scatter(model_means[:, 0], model_means[:, 1], c=ys, s=100,
linewidth=2, edgecolors='black', marker='D')
plt.axis('off')
plt.savefig('/Users/noah/Dev/SGLD/embeddings.png', bbox_inches='tight')
plt.close(f)
track.debug("[tsne] done! saved to embeddings.jpg")
def test(testloader,
model,
criterion,
epoch,
cuda=False,
metric=True,
criterion_has_labels=True,
compute_acc=True):
"""
criterion = torch.nn.Loss instance.
criterion_has_labels (bool): if true, the above criterion is called as
criterion(outputs, labels). otherwise, just criterion(outputs).
returns (test_loss, test_acc) if compute_acc is True
otherwise, returns test_loss alone
"""
batch_time = AverageMeter()
data_time = AverageMeter()
losses = AverageMeter()
top1 = AverageMeter()
top5 = AverageMeter()
# switch to evaluate mode
model.eval()
end = time.time()
with torch.no_grad():
for batch_idx, (inputs, targets) in enumerate(testloader):
# measure data loading time
data_time.update(time.time() - end)
if cuda:
inputs, targets = inputs.cuda(), targets.cuda()
with torch.no_grad():
# compute output
outputs = model(inputs)
if criterion_has_labels:
loss = criterion(outputs, targets)
else:
loss = criterion(outputs)
# measure accuracy and record loss
losses.update(loss.item(), inputs.size(0))
if compute_acc:
prec1, prec5 = accuracy(outputs.data,
targets.data,
topk=(1, 5))
top1.update(prec1.item(), inputs.size(0))
top5.update(prec5.item(), inputs.size(0))
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# plot progress
if compute_acc:
progress_str = 'Loss: %.3f | Acc: %.3f%% (%d/%d)'\
% (losses.avg, top1.avg, top1.sum, top1.count)
else:
progress_str = 'Loss: %.3f (%d/%d)'\
% (losses.avg, batch_idx*inputs.size(0), losses.count)
progress_bar(batch_idx, len(testloader), progress_str)
if metric:
track.metric(iteration=0,
epoch=epoch,
avg_test_loss=losses.avg,
avg_test_acc=top1.avg)
if compute_acc:
return (losses.avg, top1.avg)
else:
return losses.avg
def train(trainloader,
model,
criterion,
optimizer,
epoch,
cuda=False,
num_chunks=4):
# switch to train mode
model.train()
batch_time = AverageMeter()
data_time = AverageMeter()
losses = AverageMeter()
top1 = AverageMeter()
top5 = AverageMeter()
end = time.time()
for batch_idx, (all_inputs, all_targets) in enumerate(trainloader):
# measure data loading time
data_time.update(time.time() - end)
# do mini-mini-batching for large batch sizes
xs = all_inputs.chunk(num_chunks)
ys = all_targets.chunk(num_chunks)
optimizer.zero_grad()
batch_prec1 = 0.0
batch_loss = 0.0
for (inputs, targets) in zip(xs, ys):
if cuda:
inputs, targets = inputs.cuda(), targets.cuda(async=True)
# compute output
outputs = model(inputs)
mini_loss = criterion(outputs, targets) / num_chunks
batch_loss += mini_loss.item()
mini_loss.backward()
# measure accuracy and record loss
prec1, prec5 = accuracy(outputs.data, targets.data, topk=(1, 5))
batch_prec1 += prec1.item() / num_chunks
losses.update(num_chunks * mini_loss.item(), inputs.size(0))
top1.update(prec1.item(), inputs.size(0))
top5.update(prec5.item(), inputs.size(0))
# compute gradient and do SGD step
optimizer.step(epoch)
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# plot progress
progress_str = 'Loss: %.3f | Acc: %.3f%% (%d/%d)'\
% (losses.avg, top1.avg, top1.sum, top1.count)
progress_bar(batch_idx, len(trainloader), progress_str)
iteration = epoch * len(trainloader) + batch_idx
track.metric(iteration=iteration,
epoch=epoch,
avg_train_loss=losses.avg,
avg_train_acc=top1.avg,
cur_train_loss=batch_loss,
cur_train_acc=batch_prec1)
return (losses.avg, top1.avg)