docstr: Test norm returns expected value.
code: def norm(self):
      """Test norm returns expected value."""
      self.assertTrue(
          np.allclose(self.vectors.norm("dog.n.01"), 0.97757602)
      )
      self.assertTrue(
          np.allclose(self.vectors.norm("mammal.n.01"), 0.03914723)
      )
  
imports: import logging
  import os
  import tempfile
  import unittest
  import numpy
  from gensim.models.poincare import PoincareRelations, PoincareModel, PoincareKeyedVectors
  from gensim.test.utils import datapath
label_desc: Use image node_id 18 for calling the TestPoincareKeyedVectors obj's underlying member method code with example usage: obj.norm() without return types