def test_to_proto(self):
v1 = resource_variable_ops.ResourceVariable(2.)
saver = functional_saver.MultiDeviceSaver(
saveable_object_util.saveable_objects_for_op(v1, "x"))
prefix = os.path.join(self.get_temp_dir(), "ckpt")
proto_accumulator = []
wrapped = wrap_function.wrap_function(
lambda: proto_accumulator.append(saver.to_proto()), signature=())
self.assertEqual(1, len(proto_accumulator))
proto = proto_accumulator[0]
save = wrapped.prune(
feeds=wrapped.graph.get_tensor_by_name(proto.filename_tensor_name),
fetches=wrapped.graph.get_tensor_by_name(proto.save_tensor_name))
restore = wrapped.prune(
feeds=wrapped.graph.get_tensor_by_name(proto.filename_tensor_name),
fetches=wrapped.graph.get_operation_by_name(proto.restore_op_name))
save_path = save(constant_op.constant(prefix))
v1.assign(1.)
restore(constant_op.constant(save_path))
self.assertEqual(2., self.evaluate(v1))
v2 = resource_variable_ops.ResourceVariable(3.)
second_saver = functional_saver.MultiDeviceSaver(
saveable_object_util.saveable_objects_for_op(v2, "x"))
second_saver.restore(save_path)
self.assertEqual(2., self.evaluate(v2))
def test_callbacks_run(self):
# Use dict because an int would be shadowed inside callback.
called = {
"save": 0,
"restore": 0,
}
class DummyHook(saveable_hook.SaveableHook):
def before_save(self):
called["save"] += 1
def after_restore(self):
called["restore"] += 1
saveable = DummyHook(name="dummy")
saver = functional_saver.MultiDeviceSaver([saveable])
prefix = os.path.join(self.get_temp_dir(), "ckpt")
self.evaluate(saver.save(constant_op.constant(prefix)))
self.assertEqual({"save": 1, "restore": 0}, called)
self.evaluate(saver.restore(prefix))
self.assertEqual({"save": 1, "restore": 1}, called)
def test_checkpoint_multi_device_using_localhost(self):
with ops.device("cpu:0"):
v0 = resource_variable_ops.ResourceVariable(0.)
with ops.device("cpu:1"):
v1 = resource_variable_ops.ResourceVariable(1.)
with ops.device("cpu:2"):
v2 = resource_variable_ops.ResourceVariable(2.)
self.evaluate([v0.initializer, v1.initializer, v2.initializer])
saver = functional_saver.MultiDeviceSaver(
list(saveable_object_util.saveable_objects_for_op(v0, "v0")) +
list(saveable_object_util.saveable_objects_for_op(v1, "v1")) +
list(saveable_object_util.saveable_objects_for_op(v2, "v2")))
prefix = os.path.join(self.get_temp_dir(), "ckpt")
self.evaluate(saver.save(constant_op.constant(prefix), self.local_options))
self.assertEqual(2, len(gfile.Glob(prefix + "*")))
self.evaluate(v0.assign(-1.))
self.evaluate(v1.assign(-1.))
self.evaluate(v2.assign(-1.))
self.evaluate(
saver.restore(constant_op.constant(prefix), self.local_options))
self.assertEqual(0., self.evaluate(v0))
self.assertEqual(1., self.evaluate(v1))
self.assertEqual(2., self.evaluate(v2))
# In graph mode, verify that the save and restore ops were set to run on
# localhost.
if not context.executing_eagerly():
for op in ops.get_default_graph().get_operations():
if op.type in ("SaveV2", "RestoreV2", "MergeV2Checkpoints"):
self.assertEqual(LOCALHOST, op.device)
def test_checkpoint_is_sharded_by_task(self):
servers = [server_lib.Server.create_local_server() for _ in range(3)]
cluster_spec = server_lib.ClusterSpec({
"worker": [s.target[len("grpc://"):] for s in servers]})
remote.connect_to_cluster(cluster_spec)
with ops.device("/job:worker/task:0/cpu:0"):
v0 = resource_variable_ops.ResourceVariable(0.)
with ops.device("/job:worker/task:1/cpu:0"):
v1 = resource_variable_ops.ResourceVariable(1.)
with ops.device("/job:worker/task:2/cpu:0"):
v2 = resource_variable_ops.ResourceVariable(2.)
self.evaluate([v0.initializer, v1.initializer, v2.initializer])
saver = functional_saver.MultiDeviceSaver(
list(saveable_object_util.saveable_objects_for_op(v0, "v0")) +
list(saveable_object_util.saveable_objects_for_op(v1, "v1")) +
list(saveable_object_util.saveable_objects_for_op(v2, "v2")))
prefix = os.path.join(self.get_temp_dir(), "ckpt")
self.evaluate(saver.save(constant_op.constant(prefix)))
self.assertEqual(4, len(gfile.Glob(prefix + "*")))
self.evaluate(v0.assign(-1.))
self.evaluate(v1.assign(-1.))
self.evaluate(v2.assign(-1.))
self.evaluate(saver.restore(constant_op.constant(prefix)))
self.assertEqual(0., self.evaluate(v0))
self.assertEqual(1., self.evaluate(v1))
self.assertEqual(2., self.evaluate(v2))
def test_checkpoint_is_sharded_by_device(self):
with ops.device("cpu:0"):
v0 = resource_variable_ops.ResourceVariable(0.)
with ops.device("cpu:1"):
v1 = resource_variable_ops.ResourceVariable(1.)
with ops.device("cpu:2"):
v2 = resource_variable_ops.ResourceVariable(2.)
self.evaluate([v0.initializer, v1.initializer, v2.initializer])
saver = functional_saver.MultiDeviceSaver(
list(saveable_object_util.saveable_objects_for_op(v0, "v0")) +
list(saveable_object_util.saveable_objects_for_op(v1, "v1")) +
list(saveable_object_util.saveable_objects_for_op(v2, "v2")))
prefix = os.path.join(self.get_temp_dir(), "ckpt")
self.evaluate(saver.save(constant_op.constant(prefix)))
self.assertEqual(4, len(gfile.Glob(prefix + "*")))
self.evaluate(v0.assign(-1.))
self.evaluate(v1.assign(-1.))
self.evaluate(v2.assign(-1.))
self.evaluate(saver.restore(constant_op.constant(prefix)))
self.assertEqual(0., self.evaluate(v0))
self.assertEqual(1., self.evaluate(v1))
self.assertEqual(2., self.evaluate(v2))
def _fill_meta_graph_def(meta_graph_def, saveable_view, signature_functions,
namespace_whitelist):
"""Generates a MetaGraph which calls `signature_functions`.
Args:
meta_graph_def: The MetaGraphDef proto to fill.
saveable_view: The _SaveableView being exported.
signature_functions: A dictionary mapping signature keys to concrete
functions containing signatures to add to the MetaGraph.
namespace_whitelist: List of strings containing whitelisted op namespaces.
Returns:
A tuple of (_AssetInfo, Graph) containing the captured assets and
exported Graph generated from tracing the saveable_view.
"""
# List objects from the eager context to make sure Optimizers give us the
# right Graph-dependent variables.
accessible_objects = saveable_view.nodes
resource_initializer_functions = _trace_resource_initializers(
accessible_objects)
exported_graph = ops.Graph()
resource_initializer_ops = []
with exported_graph.as_default():
object_map, resource_map, asset_info = saveable_view.map_resources()
for resource_initializer_function in resource_initializer_functions:
asset_dependencies = []
for capture in resource_initializer_function.graph.external_captures:
asset_initializer = asset_info.asset_initializers_by_resource.get(
capture, None)
if asset_initializer is not None:
asset_dependencies.append(asset_initializer)
with ops.control_dependencies(asset_dependencies):
resource_initializer_ops.append(
_call_function_with_mapped_captures(
resource_initializer_function, [], resource_map))
resource_initializer_ops.extend(
asset_info.asset_initializers_by_resource.values())
with ops.control_dependencies(resource_initializer_ops):
init_op = control_flow_ops.no_op()
# Add the same op to the main_op collection and to the init_op
# signature. The collection is for compatibility with older loader APIs;
# only one will be executed.
meta_graph_def.collection_def[constants.MAIN_OP_KEY].node_list.value.append(
init_op.name)
meta_graph_def.signature_def[constants.INIT_OP_SIGNATURE_KEY].CopyFrom(
signature_def_utils.op_signature_def(
init_op, constants.INIT_OP_SIGNATURE_KEY))
# Saving an object-based checkpoint again gathers variables. We need to do the
# gathering from the eager context so Optimizers save the right set of
# variables, but want any operations associated with the save/restore to be in
# the exported graph (thus the `to_graph` argument).
saver = functional_saver.MultiDeviceSaver(
saveable_view.checkpoint_view.frozen_saveable_objects(
object_map=object_map, to_graph=exported_graph))
with exported_graph.as_default():
signatures = _generate_signatures(signature_functions, resource_map)
for concrete_function in saveable_view.concrete_functions:
concrete_function.add_to_graph()
saver_def = saver.to_proto()
meta_graph_def.saver_def.CopyFrom(saver_def)
graph_def = exported_graph.as_graph_def(add_shapes=True)
_verify_ops(graph_def, namespace_whitelist)
meta_graph_def.graph_def.CopyFrom(graph_def)
meta_graph_def.meta_info_def.tags.append(tag_constants.SERVING)
meta_graph_def.meta_info_def.tensorflow_version = versions.__version__
meta_graph_def.meta_info_def.tensorflow_git_version = (
versions.__git_version__)
# We currently always strip default attributes.
meta_graph_def.meta_info_def.stripped_default_attrs = True
meta_graph_def.meta_info_def.stripped_op_list.MergeFrom(
meta_graph.stripped_op_list_for_graph(meta_graph_def.graph_def))
meta_graph_def.asset_file_def.extend(asset_info.asset_defs)
for signature_key, signature in signatures.items():
meta_graph_def.signature_def[signature_key].CopyFrom(signature)
meta_graph.strip_graph_default_valued_attrs(meta_graph_def)
return asset_info, exported_graph
