code: def __call__(self, x, value=None):
      # output input if value not specified
      self._value = value = value if value is not None else x
      self.output_types = get_output_types(value)
      self.stage = OperandStage.agg
      return self.new_tileable([x, value], kws=[value.params])
  
imports: import numpy
  from ...None import opcodes
  from ...None import tensor
  from ...core import ENTITY_TYPE, get_output_types, recursive_tile
  from ...core.operand import OperandStage
  from ...config import options
  from ...serialization.serializables import KeyField, StringField, BoolField, DataTypeField
  from ...tensor.core import TensorOrder, TENSOR_CHUNK_TYPE
  from ...tensor.array_utils import as_same_device, device, issparse, get_array_module
  from ...utils import ceildiv
  from ..operands import LearnOperand, LearnOperandMixin, OutputType
label_desc: Use image node_id 6 for calling the CheckBase obj's underlying member method code with example usage: obj.__call__(x, value) and returns: self