code: def _no_op(x):
      return x
  
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 2 for calling a global function with example usage: _no_op(x) and returns: x