code: def ddof(self):
      return self._ddof
  
imports: import numpy
  from ...None import opcodes
  from ...serialization.serializables import Int32Field
  from ..datasource import tensor
  from ..array_utils import device, as_same_device, get_array_module
  from .var import reduce_var_square
  from .core import TensorReduction, TensorReductionMixin, nannumel
label_desc: Use image node_id 3 for calling the TensorNanMoment obj's underlying member method code with example usage: obj.ddof() and returns: self