chore: import upstream snapshot with attribution

tests/python/common/data/test_actor.py

@@ -0,0 +1,22 @@
+import unittest
+
+import backend as F
+
+import dgl
+
+
+@unittest.skipIf(
+    F._default_context_str == "gpu",
+    reason="Datasets don't need to be tested on GPU.",
+)
+@unittest.skipIf(
+    dgl.backend.backend_name != "pytorch", reason="only supports pytorch"
+)
+def test_actor():
+    transform = dgl.AddSelfLoop(allow_duplicate=True)
+
+    g = dgl.data.ActorDataset(force_reload=True)[0]
+    assert g.num_nodes() == 7600
+    assert g.num_edges() == 33391
+    g2 = dgl.data.ActorDataset(force_reload=True, transform=transform)[0]
+    assert g2.num_edges() - g.num_edges() == g.num_nodes()