code: def test_length_normalize(matrix):
      assert np.allclose(
          np.sqrt(np.sum(length_normalize(matrix) ** 2, axis=1)),
          np.ones(matrix.shape[0]),
          atol=1e-6,
      )
  
file_path: recommenders/tests/unit/recommenders/models/test_geoimc.py
imports: import collections
  import pytest
  import numpy
  from scipy.sparse import csr_matrix
label_desc: Use image node_id 2 for calling a global function with example usage: test_length_normalize(matrix) without return types