code: def testCollectiveGather(self):
      # Tests that execute collectives need to be enclosed in graph or tf.function
      with ops.Graph().as_default():
          self._testCollectiveGather(
              [0, 1, 2, 3, 4, 5, 6, 7],
              [10, 11, 12, 13, 14, 15, 16, 17],
              [0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 16, 17],
              True,
          )
          self._testCollectiveGather(
              [[0, 1, 2, 3], [4, 5, 6, 7]],
              [[10, 11, 12, 13], [14, 15, 16, 17]],
              [
                  [0, 1, 2, 3],
                  [4, 5, 6, 7],
                  [10, 11, 12, 13],
                  [14, 15, 16, 17],
              ],
              True,
          )
          self._testCollectiveGather(
              [[[0, 1], [2, 3]], [[4, 5], [6, 7]]],
              [[[10, 11], [12, 13]], [[14, 15], [16, 17]]],
              [
                  [[0, 1], [2, 3]],
                  [[4, 5], [6, 7]],
                  [[10, 11], [12, 13]],
                  [[14, 15], [16, 17]],
              ],
              True,
          )
  
imports: import time
  from tensorflow.core.protobuf import config_pb2
  from tensorflow.core.protobuf import rewriter_config_pb2
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import config
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import kernels
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import collective_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.ops import variables
  from tensorflow.python.ops import while_loop
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 21 for calling the CollectiveOpTest obj's underlying member method code with example usage: obj.testCollectiveGather() without return types