code: def test_nrm2(dtype):
      nrm2 = _nrm2_memview[_numpy_to_cython(dtype)]
  
      rng = np.random.RandomState(0)
      x = rng.random_sample(10).astype(dtype, copy=False)
  
      expected = np.linalg.norm(x)
      actual = nrm2(x)
  
      assert_allclose(actual, expected, rtol=RTOL[dtype])
  
file_path: scikit-learn/sklearn/utils/tests/test_cython_blas.py
imports: import numpy
  import pytest
  from sklearn.utils._cython_blas import ColMajor, NoTrans, RowMajor, Trans, _asum_memview, _axpy_memview, _copy_memview, _dot_memview, _gemm_memview, _gemv_memview, _ger_memview, _nrm2_memview, _rot_memview, _rotg_memview, _scal_memview
  from sklearn.utils._testing import assert_allclose
label_desc: Use image node_id 6 for calling a global function with example usage: test_nrm2(dtype) without return types