code: def testAssertRaisesUnknownNumSplits(self):
      split_sizes = tf1.placeholder_with_default(
          [-1, 2, 1], shape=[None]
      )
      with self.assertRaisesRegexp(
          ValueError, "must have a statically-known number of elements"
      ):
          split.Split(
              num_or_size_splits=split_sizes, validate_args=True
          )
  
imports: from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.bijectors import split
  from tensorflow_probability.python.internal import tensorshape_util
  from tensorflow_probability.python.internal import test_util
label_desc: Use image node_id 5 for calling the SplitBijectorTestDynamic obj's underlying member method code with example usage: obj.testAssertRaisesUnknownNumSplits() without return types