code: def __init__(self):
      super(SumError, self).__init__()
  
imports: from singa import layer
  from singa import model
  from singa import tensor
  from singa import opt
  from singa import device
  from singa.autograd import Operator
  from singa.layer import Layer
  from singa import singa_wrap
  import argparse
  import numpy
label_desc: Use image node_id 1 to create a new SumError object from inherited base classes: Operator with example: obj = SumError()