code: def _kernel_matrix(x, kernel):
      """Return RBFs, with centers at `x`, evaluated at `x`."""
      out = np.empty((x.shape[0], x.shape[0]), dtype=float)
      kernel_func = NAME_TO_FUNC[kernel]
      kernel_matrix(x, kernel_func, out)
      return out
  
file_path: scipy/scipy/interpolate/_rbfinterp_pythran.py
imports: import numpy
label_desc: Use image node_id 13 for calling a global function with example usage: _kernel_matrix(x, kernel) and returns: out