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# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
import unittest
import torch
from detectron2.structures import Instances
class TestInstancesIndexing(unittest.TestCase):
def test_int_indexing(self):
attr1 = torch.tensor([[0.0, 0.0, 1.0], [0.0, 0.0, 0.5], [0.0, 0.0, 1.0], [0.0, 0.5, 0.5]])
attr2 = torch.tensor([0.1, 0.2, 0.3, 0.4])
instances = Instances((100, 100))
instances.attr1 = attr1
instances.attr2 = attr2
for i in range(-len(instances), len(instances)):
inst = instances[i]
self.assertEqual((inst.attr1 == attr1[i]).all(), True)
self.assertEqual((inst.attr2 == attr2[i]).all(), True)
self.assertRaises(IndexError, lambda: instances[len(instances)])
self.assertRaises(IndexError, lambda: instances[-len(instances) - 1])
if __name__ == "__main__":
unittest.main()
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