🐛 Bug

import torch
x = torch.tensor([1, 2, 3])
y = torch.tensor([5, 6, 3])
y in x  # True

Expected behavior

This particular case should be False. Related: #17733 #24156
The incorrect semantics was introduced in PyTorch 1.2 (May), but no one else has complained about it yet in the three months since.

Environment

pytorch master.

cc @mruberry @rgommers @heitorschueroff