1# Copyright 2018 The TensorFlow Authors. All Rights Reserved. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14# ============================================================================== 15 16import os 17 18from absl.testing import parameterized 19from tensorflow.python.checkpoint import checkpoint as trackable_utils 20from tensorflow.python.distribute import combinations 21from tensorflow.python.distribute import strategy_combinations 22from tensorflow.python.eager import test 23from tensorflow.python.ops import array_ops 24from tensorflow.python.ops import variables as variables_lib 25 26 27class TrainingCheckpointTests(test.TestCase, parameterized.TestCase): 28 29 @combinations.generate( 30 combinations.combine( 31 distribution=[ 32 strategy_combinations.mirrored_strategy_with_one_cpu, 33 strategy_combinations.mirrored_strategy_with_gpu_and_cpu, 34 strategy_combinations.tpu_strategy, 35 strategy_combinations.tpu_strategy_packed_var, 36 strategy_combinations.central_storage_strategy_with_two_gpus, 37 ], 38 mode=["eager"])) 39 def testInitializeFromCheckpoint(self, distribution): 40 variable_shape = [5] 41 save_checkpoint = trackable_utils.Checkpoint(v=variables_lib.Variable( 42 array_ops.ones(variable_shape))) 43 save_path = save_checkpoint.save( 44 os.path.join(self.get_temp_dir(), "checkpoint")) 45 with distribution.scope(): 46 restore_checkpoint = trackable_utils.Checkpoint() 47 restore_checkpoint.restore(save_path) 48 initial_value = restore_checkpoint._preload_simple_restoration( 49 "v") 50 v = variables_lib.Variable(initial_value) 51 # Check that the variable is now tagged as restored. `Checkpoint` then 52 # knows it doesn't have to restore `v`'s value when it's assigned to an 53 # object. 54 self.assertGreater(v._update_uid, 0) 55 self.assertAllClose(array_ops.ones(variable_shape), v) 56 v.assign(array_ops.zeros(variable_shape)) 57 # Assignment to an object should not trigger restoration, since we already 58 # restored the object through an initializer. This wouldn't be a 59 # correctness issue, but it would mean that models would use twice as much 60 # memory when loading (the buffer already assigned to the variable, and 61 # the new restoration). 62 restore_checkpoint.v = v 63 self.assertAllClose(array_ops.zeros(variable_shape), v) 64 65 66if __name__ == "__main__": 67 test.main() 68