code: def _get_loss(truth, guess):
      return numpy.sum(numpy.sum(0.5 * numpy.square(truth - guess), 1))
  
imports: from functools import partial
  import numpy
  import pytest
  from numpy.testing import assert_allclose
  from thinc.api import Linear, NumpyOps, Relu, chain
label_desc: Use image node_id 20 for calling a global function with example usage: _get_loss(truth, guess) and returns: numpy