4.5 使用ogb包加载OGB数据集

(中文版)

Open Graph Benchmark (OGB) 是一个基准数据集的集合。官方的 OGB 包 ogb 提供了 API，用于下载并将 OGB 数据集处理成 dgl.data.DGLGraph 对象。本节将介绍它们的基本用法。

首先使用pip安装ogb包：

pip install ogb

以下代码展示了如何为图属性预测任务加载数据集。

# Load Graph Property Prediction datasets in OGB
import dgl
import torch
from ogb.graphproppred import DglGraphPropPredDataset
from dgl.dataloading import GraphDataLoader


def _collate_fn(batch):
    # batch is a list of tuple (graph, label)
    graphs = [e[0] for e in batch]
    g = dgl.batch(graphs)
    labels = [e[1] for e in batch]
    labels = torch.stack(labels, 0)
    return g, labels

# load dataset
dataset = DglGraphPropPredDataset(name='ogbg-molhiv')
split_idx = dataset.get_idx_split()
# dataloader
train_loader = GraphDataLoader(dataset[split_idx["train"]], batch_size=32, shuffle=True, collate_fn=_collate_fn)
valid_loader = GraphDataLoader(dataset[split_idx["valid"]], batch_size=32, shuffle=False, collate_fn=_collate_fn)
test_loader = GraphDataLoader(dataset[split_idx["test"]], batch_size=32, shuffle=False, collate_fn=_collate_fn)

加载节点属性预测数据集是类似的，但请注意，在这种数据集中只有一个图对象。

# Load Node Property Prediction datasets in OGB
from ogb.nodeproppred import DglNodePropPredDataset

dataset = DglNodePropPredDataset(name='ogbn-proteins')
split_idx = dataset.get_idx_split()

# there is only one graph in Node Property Prediction datasets
g, labels = dataset[0]
# get split labels
train_label = dataset.labels[split_idx['train']]
valid_label = dataset.labels[split_idx['valid']]
test_label = dataset.labels[split_idx['test']]

链接属性预测 数据集每个数据集也包含一个图。

# Load Link Property Prediction datasets in OGB
from ogb.linkproppred import DglLinkPropPredDataset

dataset = DglLinkPropPredDataset(name='ogbl-ppa')
split_edge = dataset.get_edge_split()

graph = dataset[0]
print(split_edge['train'].keys())
print(split_edge['valid'].keys())
print(split_edge['test'].keys())