def run_tree(args=None):
args = args or get_args()
# Create a logger
log = Log(args.log_dir)
print("Log dir: ", args.log_dir, flush=True)
# Create a csv log for storing the test accuracy, mean train accuracy and mean loss for each epoch
log.create_log('log_epoch_overview', 'epoch', 'test_acc', 'mean_train_acc', 'mean_train_crossentropy_loss_during_epoch')
# Log the run arguments
save_args(args, log.metadata_dir)
if not args.disable_cuda and torch.cuda.is_available():
# device = torch.device('cuda')
device = torch.device('cuda:{}'.format(torch.cuda.current_device()))
else:
device = torch.device('cpu')
# Log which device was actually used
log.log_message('Device used: '+str(device))
# Create a log for logging the loss values
log_prefix = 'log_train_epochs'
log_loss = log_prefix+'_losses'
log.create_log(log_loss, 'epoch', 'batch', 'loss', 'batch_train_acc')
# Obtain the dataset and dataloaders
trainloader, projectloader, testloader, classes, num_channels = get_dataloaders(args)
# Create a convolutional network based on arguments and add 1x1 conv layer
features_net, add_on_layers = get_network(num_channels, args)
# Create a ProtoTree
tree = ProtoTree(num_classes=len(classes),
feature_net = features_net,
args = args,
add_on_layers = add_on_layers)
tree = tree.to(device=device)
# Determine which optimizer should be used to update the tree parameters
optimizer, params_to_freeze, params_to_train = get_optimizer(tree, args)
scheduler = torch.optim.lr_scheduler.MultiStepLR(optimizer=optimizer, milestones=args.milestones, gamma=args.gamma)
tree, epoch = init_tree(tree, optimizer, scheduler, device, args)
tree.save(f'{log.checkpoint_dir}/tree_init')
log.log_message("Max depth %s, so %s internal nodes and %s leaves"%(args.depth, tree.num_branches, tree.num_leaves))
analyse_output_shape(tree, trainloader, log, device)
leaf_labels = dict()
best_train_acc = 0.
best_test_acc = 0.
if epoch < args.epochs + 1:
'''
TRAIN AND EVALUATE TREE
'''
for epoch in range(epoch, args.epochs + 1):
log.log_message("\nEpoch %s"%str(epoch))
# Freeze (part of) network for some epochs if indicated in args
freeze(tree, epoch, params_to_freeze, params_to_train, args, log)
log_learning_rates(optimizer, args, log)
# Train tree
if tree._kontschieder_train:
train_info = train_epoch_kontschieder(tree, trainloader, optimizer, epoch, args.disable_derivative_free_leaf_optim, device, log, log_prefix)
else:
train_info = train_epoch(tree, trainloader, optimizer, epoch, args.disable_derivative_free_leaf_optim, device, log, log_prefix)
save_tree(tree, optimizer, scheduler, epoch, log, args)
best_train_acc = save_best_train_tree(tree, optimizer, scheduler, best_train_acc, train_info['train_accuracy'], log)
leaf_labels = analyse_leafs(tree, epoch, len(classes), leaf_labels, args.pruning_threshold_leaves, log)
# Evaluate tree
if args.epochs>100:
if epoch%10==0 or epoch==args.epochs:
eval_info = eval(tree, testloader, epoch, device, log)
original_test_acc = eval_info['test_accuracy']
best_test_acc = save_best_test_tree(tree, optimizer, scheduler, best_test_acc, eval_info['test_accuracy'], log)
log.log_values('log_epoch_overview', epoch, eval_info['test_accuracy'], train_info['train_accuracy'], train_info['loss'])
else:
log.log_values('log_epoch_overview', epoch, "n.a.", train_info['train_accuracy'], train_info['loss'])
else:
eval_info = eval(tree, testloader, epoch, device, log)
original_test_acc = eval_info['test_accuracy']
best_test_acc = save_best_test_tree(tree, optimizer, scheduler, best_test_acc, eval_info['test_accuracy'], log)
log.log_values('log_epoch_overview', epoch, eval_info['test_accuracy'], train_info['train_accuracy'], train_info['loss'])
scheduler.step()
else: #tree was loaded and not trained, so evaluate only
'''
EVALUATE TREE
'''
eval_info = eval(tree, testloader, epoch, device, log)
original_test_acc = eval_info['test_accuracy']
best_test_acc = save_best_test_tree(tree, optimizer, scheduler, best_test_acc, eval_info['test_accuracy'], log)
log.log_values('log_epoch_overview', epoch, eval_info['test_accuracy'], "n.a.", "n.a.")
'''
EVALUATE AND ANALYSE TRAINED TREE
'''
log.log_message("Training Finished. Best training accuracy was %s, best test accuracy was %s\n"%(str(best_train_acc), str(best_test_acc)))
trained_tree = deepcopy(tree)
leaf_labels = analyse_leafs(tree, epoch+1, len(classes), leaf_labels, args.pruning_threshold_leaves, log)
analyse_leaf_distributions(tree, log)
'''
PRUNE
'''
pruned = prune(tree, args.pruning_threshold_leaves, log)
name = "pruned"
save_tree_description(tree, optimizer, scheduler, name, log)
pruned_tree = deepcopy(tree)
# Analyse and evaluate pruned tree
leaf_labels = analyse_leafs(tree, epoch+2, len(classes), leaf_labels, args.pruning_threshold_leaves, log)
analyse_leaf_distributions(tree, log)
eval_info = eval(tree, testloader, name, device, log)
pruned_test_acc = eval_info['test_accuracy']
pruned_tree = tree
'''
PROJECT
'''
project_info, tree = project_with_class_constraints(deepcopy(pruned_tree), projectloader, device, args, log)
name = "pruned_and_projected"
save_tree_description(tree, optimizer, scheduler, name, log)
pruned_projected_tree = deepcopy(tree)
# Analyse and evaluate pruned tree with projected prototypes
average_distance_nearest_image(project_info, tree, log)
leaf_labels = analyse_leafs(tree, epoch+3, len(classes), leaf_labels, args.pruning_threshold_leaves, log)
analyse_leaf_distributions(tree, log)
eval_info = eval(tree, testloader, name, device, log)
pruned_projected_test_acc = eval_info['test_accuracy']
eval_info_samplemax = eval(tree, testloader, name, device, log, 'sample_max')
get_avg_path_length(tree, eval_info_samplemax, log)
eval_info_greedy = eval(tree, testloader, name, device, log, 'greedy')
get_avg_path_length(tree, eval_info_greedy, log)
fidelity_info = eval_fidelity(tree, testloader, device, log)
# Upsample prototype for visualization
project_info = upsample(tree, project_info, projectloader, name, args, log)
# visualize tree
gen_vis(tree, name, args, classes)
return trained_tree.to('cpu'), pruned_tree.to('cpu'), pruned_projected_tree.to('cpu'), original_test_acc, pruned_test_acc, pruned_projected_test_acc, project_info, eval_info_samplemax, eval_info_greedy, fidelity_info
def train_epoch_kontschieder(tree: ProtoTree,
train_loader: DataLoader,
optimizer: torch.optim.Optimizer,
epoch: int,
disable_derivative_free_leaf_optim: bool,
device,
log: Log = None,
log_prefix: str = 'log_train_epochs',
progress_prefix: str = 'Train Epoch'
) -> dict:
tree = tree.to(device)
# Store info about the procedure
train_info = dict()
total_loss = 0.
total_acc = 0.
# Create a log if required
log_loss = f'{log_prefix}_losses'
if log is not None and epoch==1:
log.create_log(log_loss, 'epoch', 'batch', 'loss', 'batch_train_acc')
# Reset the gradients
optimizer.zero_grad()
if disable_derivative_free_leaf_optim:
print("WARNING: kontschieder arguments will be ignored when training leaves with gradient descent")
else:
if tree._kontschieder_normalization:
# Iterate over the dataset multiple times to learn leaves following Kontschieder's approach
for _ in range(10):
# Train leaves with derivative-free algorithm using normalization factor
train_leaves_epoch(tree, train_loader, epoch, device)
else:
# Train leaves with Kontschieder's derivative-free algorithm, but using softmax
train_leaves_epoch(tree, train_loader, epoch, device)
# Train prototypes and network.
# If disable_derivative_free_leaf_optim, leafs are optimized with gradient descent as well.
# Show progress on progress bar
train_iter = tqdm(enumerate(train_loader),
total=len(train_loader),
desc=progress_prefix+' %s'%epoch,
ncols=0)
# Make sure the model is in train mode
tree.train()
for i, (xs, ys) in train_iter:
xs, ys = xs.to(device), ys.to(device)
# Reset the gradients
optimizer.zero_grad()
# Perform a forward pass through the network
ys_pred, _ = tree.forward(xs)
# Compute the loss
if tree._log_probabilities:
loss = F.nll_loss(ys_pred, ys)
else:
loss = F.nll_loss(torch.log(ys_pred), ys)
# Compute the gradient
loss.backward()
# Update model parameters
optimizer.step()
# Count the number of correct classifications
ys_pred = torch.argmax(ys_pred, dim=1)
correct = torch.sum(torch.eq(ys_pred, ys))
acc = correct.item() / float(len(xs))
train_iter.set_postfix_str(
f'Batch [{i + 1}/{len(train_loader)}], Loss: {loss.item():.3f}, Acc: {acc:.3f}'
)
# Compute metrics over this batch
total_loss+=loss.item()
total_acc+=acc
if log is not None:
log.log_values(log_loss, epoch, i + 1, loss.item(), acc)
train_info['loss'] = total_loss/float(i+1)
train_info['train_accuracy'] = total_acc/float(i+1)
return train_info
