code: def __init__(self, delta, reduce="sum_along_second_axis"):
      self.delta = delta
  
      if reduce not in ("sum_along_second_axis", "no"):
          raise ValueError(
              "Only 'sum_along_second_axis' and 'no' are valid "
              "for 'reduce', but '%s' is given" % reduce
          )
  
      self.reduce = reduce
  
file_path: chainer/chainer/functions/loss/huber_loss.py
imports: import chainer
  from chainer import backend
  from chainer import function_node
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 1 to create a new HuberLoss object from inherited base classes: function_node with example: obj = HuberLoss(delta, reduce)