Parameters:
      * size_average (bool, optional) -- Deprecated (see
        "reduction"). By default, the losses are averaged over each
        loss element in the batch. Note that for some losses, there
        are multiple elements per sample. If the field "size_average"
        is set to "False", the losses are instead summed for each
        minibatch. Ignored when "reduce" is "False". Default: "True"
  * **reduce** (*bool**, **optional*) -- Deprecated (see
    "reduction"). By default, the losses are averaged or summed
    over observations for each minibatch depending on
    "size_average". When "reduce" is "False", returns a loss per
    batch element instead and ignores "size_average". Default:
    "True"

  * **reduction** (*str**, **optional*) -- Specifies the reduction
    to apply to the output: "'none'" | "'mean'" | "'sum'".
    "'none'": no reduction will be applied, "'mean'": the sum of
