code: def _blocking_takeg(self, sess, takeg_op):
      with self.assertRaisesOpError("was cancelled"):
          self.evaluate(takeg_op)
  
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 19 for calling the IndexedSlicesConditionalAccumulatorTest obj's underlying member method code with example usage: obj._blocking_takeg(sess, takeg_op) without return types