def init_model(self, model_type="mpad", lr=0.1, **kwargs):
# Store model type
self.model_type = model_type.lower()
# Initiate model
if model_type.lower() == "mpad":
self.model = MPAD(**kwargs)
else:
raise AssertionError("Currently only MPAD is supported as model")
self.model_args = kwargs
self.optimizer = optim.Adam(self.model.parameters(), lr=lr)
self.scheduler = optim.lr_scheduler.StepLR(
self.optimizer, step_size=50, gamma=0.5
)
self.criterion = torch.nn.CrossEntropyLoss()
y_val = [y[i] for i in val_index]
adj_test = [adj[i] for i in test_index]
features_test = [features[i] for i in test_index]
y_test = [y[i] for i in test_index]
adj_train, features_train, batch_n_graphs_train, y_train = generate_batches(adj_train, features_train, y_train, args.batch_size, args.use_master_node)
adj_val, features_val, batch_n_graphs_val, y_val = generate_batches(adj_val, features_val, y_val, args.batch_size, args.use_master_node)
adj_test, features_test, batch_n_graphs_test, y_test = generate_batches(adj_test, features_test, y_test, args.batch_size, args.use_master_node)
n_train_batches = ceil(n_train/args.batch_size)
n_val_batches = ceil(n_val/args.batch_size)
n_test_batches = ceil(n_test/args.batch_size)
# Model and optimizer
model = MPAD(embeddings.shape[1], args.message_passing_layers, args.hidden, args.penultimate, nclass, args.dropout, embeddings, args.use_master_node)
parameters = filter(lambda p: p.requires_grad, model.parameters())
optimizer = optim.Adam(parameters, lr=args.lr)
scheduler = optim.lr_scheduler.StepLR(optimizer, step_size=50, gamma=0.5)
if args.cuda:
model.cuda()
adj_train = [x.cuda() for x in adj_train]
features_train = [x.cuda() for x in features_train]
batch_n_graphs_train = [x.cuda() for x in batch_n_graphs_train]
y_train = [x.cuda() for x in y_train]
adj_val = [x.cuda() for x in adj_val]
features_val = [x.cuda() for x in features_val]
batch_n_graphs_val = [x.cuda() for x in batch_n_graphs_val]
y_val = [x.cuda() for x in y_val]
class Learner:
def __init__(self, experiment_name, device, multi_label):
self.experiment_name = experiment_name
self.model = None
self.optimizer = None
self.scheduler = None
self.device = device
self.writer = None
self.train_step = 0
self.multi_label = multi_label
self.best_score = 0
self.graph_preprocess_args = None
self.epoch = -1
self.model_save_dir = os.path.join(experiment_name, "models")
self.model_type = None
self.model_args = None
self.log_dir = None
os.makedirs(self.model_save_dir, exist_ok=True)
self.best_model_path = os.path.join(self.model_save_dir, "model_best.pt")
def set_graph_preprocessing_args(self, args):
assert set(list(args.keys())) == set(
GRAPH_PREPROCESS_ARGS), "Error, trying to set graph preprocessing arguments, got keys: {}, \n expected: {}".format(
list(args.keys()), GRAPH_PREPROCESS_ARGS)
self.graph_preprocess_args = args
def get_graph_preprocessing_args(self):
return self.graph_preprocess_args
def init_model(self, model_type="mpad", lr=0.1, **kwargs):
# Store model type
self.model_type = model_type.lower()
# Initiate model
if model_type.lower() == "mpad":
self.model = MPAD(**kwargs)
else:
raise AssertionError("Currently only MPAD is supported as model")
self.model_args = kwargs
self.optimizer = optim.Adam(self.model.parameters(), lr=lr)
self.scheduler = optim.lr_scheduler.StepLR(
self.optimizer, step_size=50, gamma=0.5
)
self.criterion = torch.nn.CrossEntropyLoss()
def train_epoch(self, dataloader, eval_every):
self.epoch += 1
self.model.train()
total_iters = -1
with tqdm(initial=0, total=eval_every) as pbar_train:
for batch_ix, batch in enumerate(dataloader):
total_iters += 1
batch = (t.to(self.device) for t in batch)
A, nodes, y, n_graphs = batch
preds = self.model(nodes, A, n_graphs)
loss = self.criterion(preds, y)
self.optimizer.zero_grad()
loss.backward()
# grad norm clipping?
self.optimizer.step()
self.scheduler.step()
pbar_train.update(1)
pbar_train.set_description(
"Training step {} -> loss: {}".format(total_iters + 1, loss.item())
)
if (total_iters + 1) % eval_every == 0:
# Stop training
break
def compute_metrics(self, y_pred, y_true):
if self.multi_label:
raise NotImplementedError()
else:
# Compute weighted average of F1 score
y_pred = np.argmax(y_pred, axis=1)
class_report = classification_report(y_true, y_pred, output_dict=True)
return class_report["weighted avg"]["f1-score"]
def save_model(self, is_best):
to_save = {
"experiment_name": self.experiment_name,
"model_type": self.model_type,
"graph_preprocess_args":self.graph_preprocess_args,
"epoch": self.epoch,
"model_args": self.model_args,
"state_dict": self.model.state_dict(),
"optimizer": self.optimizer.state_dict(),
}
# Save model indexed by epoch nr
save_path = os.path.join(
self.model_save_dir, self.experiment_name + "_{}.pt".format(self.epoch)
)
torch.save(to_save, save_path)
if is_best:
# Save best model separately
torch.save(to_save, self.best_model_path)
def load_model(self, path, lr=0.1):
to_load = torch.load(path)
self.epoch = to_load["epoch"]
# Set up architecture of model
self.init_model(
model_type=to_load["model_type"],
lr=lr,
**to_load["model_args"] # pass as kwargs
)
# Store kwargs for
self.set_graph_preprocessing_args(to_load["graph_preprocess_args"])
self.model.load_state_dict(to_load["state_dict"])
self.optimizer.load_state_dict(to_load["optimizer"])
def load_best_model(self):
# Load the best model of the current experiment
self.load_model(self.best_model_path)
def evaluate(self, dataloader, save_model=True):
self.model.eval()
y_pred = []
y_true = []
running_loss = 0
######################################
# Infer the model on the dataset
######################################
with tqdm(initial=0, total=len(dataloader)) as pbar_eval:
with torch.no_grad():
for batch_idx, batch in enumerate(dataloader):
batch = (t.to(self.device) for t in batch)
A, nodes, y, n_graphs = batch
preds = self.model(nodes, A, n_graphs)
loss = self.criterion(preds, y)
running_loss += loss.item()
# store predictions and targets
y_pred.extend(list(preds.cpu().detach().numpy()))
y_true.extend(list(np.round(y.cpu().detach().numpy())))
pbar_eval.update(1)
pbar_eval.set_description(
"Eval step {} -> loss: {}".format(batch_idx + 1, loss.item())
)
######################################
# Compute metrics
######################################
f1 = self.compute_metrics(y_pred, y_true)
if f1 > self.best_score and save_model:
print("Saving new best model with F1 score {:.03f}".format(f1))
self.best_score = f1
self.save_model(is_best=True)
else:
print(
"Current F1-score: {:.03f}, previous best: {:.03f}".format(
f1, self.best_score
)
)