code: def testInvalidArgsUnknownShape(self):
      with self.cached_session():
          placeholder = array_ops.placeholder(
              dtypes.string, name="placeholder"
          )
          index_too_high = string_ops.reduce_join(placeholder, axis=1)
          duplicate_index = string_ops.reduce_join(
              placeholder, axis=[-1, 1]
          )
          with self.assertRaisesOpError(
              "Invalid reduction dimension 1"
          ):
              index_too_high.eval(feed_dict={placeholder.name: [""]})
          with self.assertRaisesOpError(
              "Duplicate reduction dimension 1"
          ):
              duplicate_index.eval(feed_dict={placeholder.name: [[""]]})
  
imports: import itertools
  import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import string_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 15 for calling the ReduceJoinTest obj's underlying member method code with example usage: obj.testInvalidArgsUnknownShape() without return types