code: def l2(self, x):
      return (x**2).sum()
  
file_path: Lasagne/lasagne/tests/test_regularization.py
imports: import pytest
  import numpy
  import theano.tensor
  import lasagne
  from collections import OrderedDict
  from theano.scan_module.scan_utils import equal_computations
  from mock import Mock
label_desc: Use image node_id 2 for calling the TestRegularizationPenalties obj's underlying member method code with example usage: obj.l2(x) and returns: unknown