code: def _validate_input(self, value):
      if not isinstance(value, ComplicatedSubArray):
          raise ValueError("Can only set to MySubArray values")
      return value
  
imports: import numpy
  from numpy.lib.mixins import NDArrayOperatorsMixin
  from numpy.testing import assert_, assert_raises
  from numpy.ma.testutils import assert_equal
  from numpy.ma.core import array, arange, masked, MaskedArray, masked_array, log, add, hypot, divide, asarray, asanyarray, nomask
label_desc: Use image node_id 3 for calling the ComplicatedSubArray obj's underlying member method code with example usage: obj._validate_input(value) and returns: value