code: def testIsolateSessionState(self):
      server = self._cached_server
  
      with ops.Graph().as_default():
          init_value = array_ops.placeholder(dtypes.int32)
          v = variable_v1.VariableV1(
              init_value, validate_shape=False, name="v"
          )
  
          sharing_config = config_pb2.ConfigProto(
              isolate_session_state=False
          )
          sharing_sess_0 = session.Session(
              server.target, config=sharing_config
          )
          sharing_sess_1 = session.Session(
              server.target, config=sharing_config
          )
  
          isolate_config = config_pb2.ConfigProto(
              isolate_session_state=True
          )
          isolate_sess_0 = session.Session(
              server.target, config=isolate_config
          )
          isolate_sess_1 = session.Session(
              server.target, config=isolate_config
          )
  
          # Initially all variables are initialized.
          for sess in [
              sharing_sess_0,
              sharing_sess_1,
              isolate_sess_0,
              isolate_sess_1,
          ]:
              with self.assertRaises(
                  errors_impl.FailedPreconditionError
              ):
                  sess.run(v)
  
          # Shared sessions will see each other's updates, but isolated sessions
          # will not.
          sharing_sess_0.run(v.initializer, feed_dict={init_value: 86})
          self.assertAllEqual(86, sharing_sess_0.run(v))
          self.assertAllEqual(86, sharing_sess_1.run(v))
          with self.assertRaises(errors_impl.FailedPreconditionError):
              isolate_sess_0.run(v)
          with self.assertRaises(errors_impl.FailedPreconditionError):
              isolate_sess_1.run(v)
  
          # Changing the shape works because `validate_shape` is False.
          sharing_sess_1.run(
              v.initializer, feed_dict={init_value: [86, 99]}
          )
          self.assertAllEqual([86, 99], sharing_sess_0.run(v))
          self.assertAllEqual([86, 99], sharing_sess_1.run(v))
          with self.assertRaises(errors_impl.FailedPreconditionError):
              isolate_sess_0.run(v)
          with self.assertRaises(errors_impl.FailedPreconditionError):
              isolate_sess_1.run(v)
  
          # Initializing in an isolated session will only affect the state in that
          # session.
          isolate_sess_0.run(v.initializer, feed_dict={init_value: 37})
          self.assertAllEqual([86, 99], sharing_sess_0.run(v))
          self.assertAllEqual([86, 99], sharing_sess_1.run(v))
          self.assertAllEqual(37, isolate_sess_0.run(v))
          with self.assertRaises(errors_impl.FailedPreconditionError):
              isolate_sess_1.run(v)
  
          # Isolated sessions can have different shapes for the same variable.
          isolate_sess_1.run(
              v.initializer, feed_dict={init_value: [19, 86]}
          )
          self.assertAllEqual([86, 99], sharing_sess_0.run(v))
          self.assertAllEqual([86, 99], sharing_sess_1.run(v))
          self.assertAllEqual(37, isolate_sess_0.run(v))
          self.assertAllEqual([19, 86], isolate_sess_1.run(v))
  
imports: import time
  import numpy
  from tensorflow.core.protobuf import cluster_pb2
  from tensorflow.core.protobuf import config_pb2
  from tensorflow.core.protobuf import tensorflow_server_pb2
  from tensorflow.python.client import session
  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 ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import data_flow_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
  from tensorflow.python.training import input
  from tensorflow.python.training import queue_runner_impl
  from tensorflow.python.training import server_lib
  from tsl.protobuf import rpc_options_pb2
label_desc: Use image node_id 17 for calling the GrpcServerTest obj's underlying member method code with example usage: obj.testIsolateSessionState() without return types