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import torch
from torch_geometric.data import Data
from torch_geometric.testing import withPackage
from torch_geometric.transforms import GridSampling
@withPackage('torch_cluster')
def test_grid_sampling():
assert str(GridSampling(5)) == 'GridSampling(size=5)'
pos = torch.tensor([
[0.0, 2.0],
[3.0, 2.0],
[3.0, 2.0],
[2.0, 8.0],
[2.0, 6.0],
])
y = torch.tensor([0, 1, 1, 2, 2])
batch = torch.tensor([0, 0, 0, 0, 0])
data = Data(pos=pos, y=y, batch=batch)
data = GridSampling(size=5, start=0)(data)
assert len(data) == 3
assert data.pos.tolist() == [[2, 2], [2, 7]]
assert data.y.tolist() == [1, 2]
assert data.batch.tolist() == [0, 0]
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