code: def testNegativeScale(self):
      with self.assertRaises(ValueError):
          regularizers.L1(-1.0)
  
file_path: sonnet/sonnet/src/regularizers_test.py
imports: import numpy
  from sonnet.src import regularizers
  from sonnet.src import test_utils
  import tensorflow
label_desc: Use image node_id 2 for calling the L1Test obj's underlying member method code with example usage: obj.testNegativeScale() without return types