code: def test_format_variables(self):
      with tf.device("/device:CPU:0"):
          with tf.name_scope("m1"):
              v1 = tf.Variable(tf.zeros([3, 4]), name="v1")
          with tf.name_scope("m2"):
              v2 = tf.Variable(
                  tf.zeros([5], dtype=tf.int32),
                  trainable=False,
                  name="v2",
              )
          self.assertEqual(
              utils.format_variables([v2, v1]),
              _EXPECTED_FORMATTED_VARIABLE_LIST,
          )
  
imports: from absl.testing import parameterized
  import numpy
  from sonnet.src import initializers
  from sonnet.src import test_utils
  from sonnet.src import utils
  import tensorflow
label_desc: Use image node_id 1 for calling the FormatVariablesTest obj's underlying member method code with example usage: obj.test_format_variables() without return types