code: def mse_loss(
      input, target, size_average=None, reduce=None, reduction="mean"
  ):
      reduction = _get_reduction(reduction, size_average, reduce)
      result = ivy.square(input - target)
      result = reduction(result)
      return result
  
imports: import ivy
  import ivy.functional.frontends.torch
  from ivy.functional.frontends.torch.func_wrapper import to_ivy_arrays_and_back
  from ivy.func_wrapper import with_unsupported_dtypes, with_supported_dtypes
label_desc: Use image node_id 17 for calling a global function with example usage: mse_loss(input, target, size_average, reduce, reduction) and returns: result