code: def test_backslash(self):
      hasher = hashing.Hasher(salt="")
      res2 = hasher.hash_key("x/y")
      res1 = hasher.hash_key("x\\y")
      self.assertEqual(res1, res2)
      self.assertEqual(res1, 122546703782554533059483853573887619473)
  
imports: from tensorflow_datasets import testing
  from tensorflow_datasets.core import hashing
label_desc: Use image node_id 3 for calling the HashingTest obj's underlying member method code with example usage: obj.test_backslash() without return types