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# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Tests for tf.GrpcServer."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from tensorflow.python.client import session
from tensorflow.python.framework import errors_impl
from tensorflow.python.ops import math_ops
from tensorflow.python.ops import variables
from tensorflow.python.platform import test
from tensorflow.python.training import server_lib
class SameVariablesClearTest(test.TestCase):
# Verifies behavior of tf.Session.reset().
# TODO(b/34465411): Starting multiple servers with different configurations
# in the same test is flaky. Move this test case back into
# "server_lib_test.py" when this is no longer the case.
def testSameVariablesClear(self):
server = server_lib.Server.create_local_server()
# Creates a graph with 2 variables.
v0 = variables.Variable([[2, 1]], name="v0")
v1 = variables.Variable([[1], [2]], name="v1")
v2 = math_ops.matmul(v0, v1)
# Verifies that both sessions connecting to the same target return
# the same results.
sess_1 = session.Session(server.target)
sess_2 = session.Session(server.target)
sess_1.run(variables.global_variables_initializer())
self.assertAllEqual([[4]], sess_1.run(v2))
self.assertAllEqual([[4]], sess_2.run(v2))
# Resets target. sessions abort. Use sess_2 to verify.
session.Session.reset(server.target)
with self.assertRaises(errors_impl.AbortedError):
self.assertAllEqual([[4]], sess_2.run(v2))
# Connects to the same target. Device memory for the variables would have
# been released, so they will be uninitialized.
sess_2 = session.Session(server.target)
with self.assertRaises(errors_impl.FailedPreconditionError):
sess_2.run(v2)
# Reinitializes the variables.
sess_2.run(variables.global_variables_initializer())
self.assertAllEqual([[4]], sess_2.run(v2))
sess_2.close()
if __name__ == "__main__":
test.main()
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