code: def testCommonDtypeFromLinop(self):
      x = tf.linalg.LinearOperatorDiag(tf.ones(3, tf.float16))
      self.assertEqual(
          tf.float16,
          dtype_util.common_dtype([x], dtype_hint=tf.float32),
      )
  
imports: import dataclasses
  from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import dtype_util
  from tensorflow_probability.python.internal import test_util
label_desc: Use image node_id 4 for calling the DtypeUtilTest obj's underlying member method code with example usage: obj.testCommonDtypeFromLinop() without return types