code: def dx(self):
      return self._dx
  
imports: import numpy
  from ...None import opcodes
  from ...core import recursive_tile
  from ...serialization.serializables import KeyField, Float64Field, Int8Field
  from ...utils import has_unknown_shape
  from ..array_utils import as_same_device, device
  from ..core import TensorOrder
  from ..datasource import tensor
  from ..operands import TensorOperand, TensorOperandMixin
  from ..utils import validate_axis
label_desc: Use image node_id 4 for calling the TensorTrapz obj's underlying member method code with example usage: obj.dx() and returns: self