code: def testConstructor(self):
      with ops.Graph().as_default():
          q = data_flow_ops.SparseConditionalAccumulator(
              dtypes_lib.float32, name="Q"
          )
      self.assertTrue(isinstance(q.accumulator_ref, tensor.Tensor))
      self.assertProtoEquals(
          """
        name:'Q' op:'SparseConditionalAccumulator'
        attr { key: 'dtype' value { type: DT_FLOAT } }
        attr { key: 'shape' value { shape { unknown_rank: true} } }
        attr { key: 'container' value { s: '' } }
        attr { key: 'shared_name' value { s: '' } }
        attr { key: 'reduction_type' value {s: 'MEAN'} }
        """,
          q.accumulator_ref.op.node_def,
      )
  
imports: import time
  import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import indexed_slices
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import data_flow_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the IndexedSlicesConditionalAccumulatorTest obj's underlying member method code with example usage: obj.testConstructor() without return types