code: def testZeroDims(self):
      with self.cached_session():
          inputs = np.zeros([0, 1], dtype=str)
  
          # Reduction that drops the dim of size 0.
          output = string_ops.reduce_join(inputs=inputs, axis=0)
          self.assertAllEqualUnicode([""], self.evaluate(output))
  
          # Reduction that keeps the dim of size 0.
          output = string_ops.reduce_join(inputs=inputs, axis=1)
          output_shape = self.evaluate(output).shape
          self.assertAllEqual([0], output_shape)
  
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 14 for calling the ReduceJoinTest obj's underlying member method code with example usage: obj.testZeroDims() without return types