code: def testParametersCreatedOnce(self):
      mod = linear.Linear(1)
      mod(tf.constant([[1.0]]))
      w, b = mod.w, mod.b
      mod(tf.constant([[1.0]]))
      self.assertIs(mod.w, w)
      self.assertIs(mod.b, b)
  
imports: from absl.testing import parameterized
  import numpy
  from sonnet.src import linear
  from sonnet.src import test_utils
  import tensorflow
label_desc: Use image node_id 4 for calling the LinearTest obj's underlying member method code with example usage: obj.testParametersCreatedOnce() without return types