code: def _validate_vector(u, dtype=None):
      # XXX Is order='c' really necessary?
      u = np.asarray(u, dtype=dtype, order="c")
      if u.ndim == 1:
          return u
      raise ValueError("Input vector should be 1-D.")
  
imports: import math
  import warnings
  import numpy
  import dataclasses
  from typing import Optional, Callable
  from functools import partial
  from scipy._lib._util import _asarray_validated
  from .None import _distance_wrap
  from .None import _hausdorff
  from ..linalg import norm
  from ..special import rel_entr
  from .None import _distance_pybind
label_desc: Use image node_id 14 for calling a global function with example usage: _validate_vector(u, dtype) and returns: u