mirror of
https://github.com/ml-explore/mlx-examples.git
synced 2025-11-01 03:28:08 +08:00
115 lines
3.3 KiB
Python
115 lines
3.3 KiB
Python
from argparse import ArgumentParser
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import mlx.core as mx
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import mlx.nn as nn
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import mlx.optimizers as optim
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from mlx.nn.losses import cross_entropy
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from mlx.utils import tree_flatten
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from datasets import download_cora, load_data, train_val_test_mask
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from gcn import GCN
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def loss_fn(y_hat, y, weight_decay=0.0, parameters=None):
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l = mx.mean(nn.losses.cross_entropy(y_hat, y))
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if weight_decay != 0.0:
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assert parameters != None, "Model parameters missing for L2 reg."
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l2_reg = sum(mx.sum(p[1] ** 2) for p in tree_flatten(parameters)).sqrt()
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return l + weight_decay * l2_reg
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return l
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def eval_fn(x, y):
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return mx.mean(mx.argmax(x, axis=1) == y)
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def forward_fn(gcn, x, adj, y, train_mask, weight_decay):
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y_hat = gcn(x, adj)
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loss = loss_fn(y_hat[train_mask], y[train_mask], weight_decay, gcn.parameters())
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return loss, y_hat
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def main(args):
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# Data loading
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x, y, adj = load_data(args)
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train_mask, val_mask, test_mask = train_val_test_mask()
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gcn = GCN(
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x_dim=x.shape[-1],
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h_dim=args.hidden_dim,
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out_dim=args.nb_classes,
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nb_layers=args.nb_layers,
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dropout=args.dropout,
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bias=args.bias,
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)
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mx.eval(gcn.parameters())
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optimizer = optim.Adam(learning_rate=args.lr)
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loss_and_grad_fn = nn.value_and_grad(gcn, forward_fn)
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best_val_loss = float("inf")
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cnt = 0
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# Training loop
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for epoch in range(args.epochs):
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# Loss
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(loss, y_hat), grads = loss_and_grad_fn(
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gcn, x, adj, y, train_mask, args.weight_decay
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)
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optimizer.update(gcn, grads)
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mx.eval(gcn.parameters(), optimizer.state)
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# Validation
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val_loss = loss_fn(y_hat[val_mask], y[val_mask])
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val_acc = eval_fn(y_hat[val_mask], y[val_mask])
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# Early stopping
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if val_loss < best_val_loss:
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best_val_loss = val_loss
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cnt = 0
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else:
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cnt += 1
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if cnt == args.patience:
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break
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print(
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" | ".join(
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[
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f"Epoch: {epoch:3d}",
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f"Train loss: {loss.item():.3f}",
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f"Val loss: {val_loss.item():.3f}",
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f"Val acc: {val_acc.item():.2f}",
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]
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)
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)
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# Test
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test_y_hat = gcn(x, adj)
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test_loss = loss_fn(y_hat[test_mask], y[test_mask])
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test_acc = eval_fn(y_hat[test_mask], y[test_mask])
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print(f"Test loss: {test_loss.item():.3f} | Test acc: {test_acc.item():.2f}")
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if __name__ == "__main__":
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parser = ArgumentParser()
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parser.add_argument("--nodes_path", type=str, default="cora/cora.content")
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parser.add_argument("--edges_path", type=str, default="cora/cora.cites")
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parser.add_argument("--hidden_dim", type=int, default=20)
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parser.add_argument("--dropout", type=float, default=0.5)
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parser.add_argument("--nb_layers", type=int, default=2)
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parser.add_argument("--nb_classes", type=int, default=7)
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parser.add_argument("--bias", type=bool, default=True)
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parser.add_argument("--lr", type=float, default=0.001)
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parser.add_argument("--weight_decay", type=float, default=0.0)
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parser.add_argument("--patience", type=int, default=20)
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parser.add_argument("--epochs", type=int, default=100)
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args = parser.parse_args()
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main(args)
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