code: def _validate_x(x):
      x = cupy.asarray(x)
      if x.ndim == 0:
          raise ValueError("x must be at least 1-D")
      return x
  
imports: import warnings
  import cupy
  from cupy._core import internal
  from cupy.linalg import lstsq
  import cupyx.scipy.fft
  from cupyx.scipy.ndimage import _util
  from cupyx.scipy.ndimage import _filters
  from cupyx.scipy.signal import _signaltools_core
  from cupyx.scipy.signal._arraytools import const_ext, even_ext, odd_ext, axis_reverse, axis_slice, axis_assign
  from cupyx.scipy.signal._iir_utils import apply_iir, apply_iir_sos, compute_correction_factors, compute_correction_factors_sos
label_desc: Use image node_id 25 for calling a global function with example usage: _validate_x(x) and returns: x