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import torch
from torch_geometric.data import Data
from torch_geometric.transforms import TwoHop
def test_two_hop():
transform = TwoHop()
assert str(transform) == 'TwoHop()'
edge_index = torch.tensor([[0, 0, 0, 1, 2, 3], [1, 2, 3, 0, 0, 0]])
edge_attr = torch.tensor([1, 2, 3, 1, 2, 3], dtype=torch.float)
data = Data(edge_index=edge_index, edge_attr=edge_attr, num_nodes=4)
data = transform(data)
assert len(data) == 3
assert data.edge_index.equal(
torch.tensor([
[0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3],
[1, 2, 3, 0, 2, 3, 0, 1, 3, 0, 1, 2],
]))
assert data.edge_attr.equal(
torch.tensor([1, 2, 3, 1, 0, 0, 2, 0, 0, 3, 0, 0]))
assert data.num_nodes == 4
data = Data(edge_index=edge_index, num_nodes=4)
data = transform(data)
assert len(data) == 2
assert data.edge_index.equal(
torch.tensor([
[0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3],
[1, 2, 3, 0, 2, 3, 0, 1, 3, 0, 1, 2],
]))
assert data.num_nodes == 4
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