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- from copy import deepcopy
- from typing import Dict, Optional, Tuple, Union
- from pl_bolts.optimizers.lr_scheduler import LinearWarmupCosineAnnealingLR
- import torch
- from torch import nn
- from torch.utils.tensorboard import SummaryWriter
- from torch_geometric.data import Data
- from torch_geometric import nn as tgnn
- from tqdm.auto import tqdm
- from gssl.loss import get_loss
- from gssl.tasks import evaluate_node_classification
- from gssl.utils import plot_vectors
- class Model:
- def __init__(
- self,
- feature_dim: int,
- emb_dim: int,
- loss_name: str,
- p_x: float,
- p_e: float,
- lr_base: float,
- total_epochs: int,
- warmup_epochs: int,
- ):
- self._device = torch.device(
- "cuda" if torch.cuda.is_available() else "cpu"
- )
- self._encoder = GCNEncoder(
- in_dim=feature_dim, out_dim=emb_dim
- ).to(self._device)
- self._loss_fn = get_loss(loss_name=loss_name)
- self._optimizer = torch.optim.AdamW(
- params=self._encoder.parameters(),
- lr=lr_base,
- weight_decay=1e-5,
- )
- self._scheduler = LinearWarmupCosineAnnealingLR(
- optimizer=self._optimizer,
- warmup_epochs=warmup_epochs,
- max_epochs=total_epochs,
- )
- self._p_x = p_x
- self._p_e = p_e
- self._total_epochs = total_epochs
- self._use_pytorch_eval_model = False
- def fit(
- self,
- data: Data,
- logger: Optional[SummaryWriter] = None,
- log_interval: Optional[int] = None,
- masks: Optional[Dict[str, torch.Tensor]] = None,
- ) -> dict:
- self._encoder.train()
- logs = {
- "log_epoch": [],
- "train_accuracies": [],
- "val_accuracies": [],
- "test_accuracies": [],
- "z": [],
- }
- data = data.to(self._device)
- for epoch in tqdm(iterable=range(self._total_epochs)):
- self._optimizer.zero_grad()
- (x_a, ei_a), (x_b, ei_b) = augment(
- data=data, p_x=self._p_x, p_e=self._p_e,
- )
- z_a = self._encoder(x=x_a, edge_index=ei_a)
- z_b = self._encoder(x=x_b, edge_index=ei_b)
- loss = self._loss_fn(z_a=z_a, z_b=z_b)
- loss.backward()
- # Save loss on every epoch
- if logger is not None:
- logger.add_scalar("Loss", loss.item(), epoch)
- # Log other metrics only in given interval
- if log_interval is not None and epoch % log_interval == 0:
- assert logger is not None
- z = self.predict(data=data)
- self._encoder.train() # Predict sets `eval()` mode
- logger.add_figure(
- "latent",
- plot_vectors(z, labels=data.y.cpu()),
- epoch
- )
- accs = evaluate_node_classification(
- z, data, masks=masks,
- use_pytorch=self._use_pytorch_eval_model,
- )
- logger.add_scalar("acc/train", accs["train"], epoch)
- logger.add_scalar("acc/val", accs["val"], epoch)
- logger.add_scalar("acc/test", accs["test"], epoch)
- logs["log_epoch"].append(epoch)
- logs["train_accuracies"].append(accs["train"])
- logs["val_accuracies"].append(accs["val"])
- logs["test_accuracies"].append(accs["test"])
- logs["z"].append(deepcopy(z))
- logger.add_scalar("norm", z.norm(dim=1).mean(), epoch)
- self._optimizer.step()
- self._scheduler.step()
- # Save all metrics at the end
- if logger is not None:
- z = self.predict(data=data)
- self._encoder.train() # Predict sets `eval()` mode
- accs = evaluate_node_classification(
- z, data, masks=masks,
- use_pytorch=self._use_pytorch_eval_model,
- )
- logger.add_figure(
- "latent",
- plot_vectors(z, labels=data.y.cpu()),
- self._total_epochs
- )
- logger.add_scalar("acc/train", accs["train"], self._total_epochs)
- logger.add_scalar("acc/val", accs["val"], self._total_epochs)
- logger.add_scalar("acc/test", accs["test"], self._total_epochs)
- logger.add_scalar("norm", z.norm(dim=1).mean(), self._total_epochs)
- logs["log_epoch"].append(self._total_epochs)
- logs["train_accuracies"].append(accs["train"])
- logs["val_accuracies"].append(accs["val"])
- logs["test_accuracies"].append(accs["test"])
- logs["z"].append(deepcopy(z))
- data = data.to("cpu")
- return logs
- def predict(self, data: Data) -> torch.Tensor:
- self._encoder.eval()
- with torch.no_grad():
- z = self._encoder(
- x=data.x.to(self._device),
- edge_index=data.edge_index.to(self._device),
- )
- return z.cpu()
- class GCNEncoder(nn.Module):
- def __init__(self, in_dim: int, out_dim: int):
- super().__init__()
- self._conv1 = tgnn.GCNConv(in_dim, 2 * out_dim)
- self._conv2 = tgnn.GCNConv(2 * out_dim, out_dim)
- self._bn1 = nn.BatchNorm1d(2 * out_dim, momentum=0.01) # same as `weight_decay = 0.99`
- self._act1 = nn.PReLU()
- def forward(self, x, edge_index):
- x = self._conv1(x, edge_index)
- x = self._bn1(x)
- x = self._act1(x)
- x = self._conv2(x, edge_index)
- return x
- def augment(data: Data, p_x: float, p_e: float):
- device = data.x.device
- x = data.x
- num_fts = x.size(-1)
- ei = data.edge_index
- num_edges = ei.size(-1)
- x_a = bernoulli_mask(size=(1, num_fts), prob=p_x).to(device) * x
- x_b = bernoulli_mask(size=(1, num_fts), prob=p_x).to(device) * x
- ei_a = ei[:, bernoulli_mask(size=num_edges, prob=p_e).to(device) == 1.]
- ei_b = ei[:, bernoulli_mask(size=num_edges, prob=p_e).to(device) == 1.]
- return (x_a, ei_a), (x_b, ei_b)
- def bernoulli_mask(size: Union[int, Tuple[int, ...]], prob: float):
- return torch.bernoulli((1 - prob) * torch.ones(size))
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