def thread_fn():
self.assertFalse(save_context.in_save_context())
with self.assertRaisesRegex(ValueError, 'not in a SaveContext'):
save_context.get_save_options()
options = save_options.SaveOptions(save_debug_info=False)
with save_context.save_context(options):
self.assertTrue(save_context.in_save_context())
# save_debug_info has a different value in this thread.
self.assertFalse(save_context.get_save_options().save_debug_info)
entered_context_in_thread.set()
continue_thread.wait()
self.assertFalse(save_context.in_save_context())
with self.assertRaisesRegex(ValueError, 'not in a SaveContext'):
save_context.get_save_options()
def test_multi_thread(self):
self.assertFalse(save_context.in_save_context())
with self.assertRaisesRegex(ValueError, 'not in a SaveContext'):
save_context.get_save_options()
options = save_options.SaveOptions(save_debug_info=True)
with save_context.save_context(options):
self.assertTrue(save_context.in_save_context())
self.assertTrue(save_context.get_save_options().save_debug_info)
entered_context_in_thread = threading.Event()
continue_thread = threading.Event()
def thread_fn():
self.assertFalse(save_context.in_save_context())
with self.assertRaisesRegex(ValueError, 'not in a SaveContext'):
save_context.get_save_options()
options = save_options.SaveOptions(save_debug_info=False)
with save_context.save_context(options):
self.assertTrue(save_context.in_save_context())
# save_debug_info has a different value in this thread.
self.assertFalse(save_context.get_save_options().save_debug_info)
entered_context_in_thread.set()
continue_thread.wait()
self.assertFalse(save_context.in_save_context())
with self.assertRaisesRegex(ValueError, 'not in a SaveContext'):
save_context.get_save_options()
t = threading.Thread(target=thread_fn)
t.start()
entered_context_in_thread.wait()
# Another thread shouldn't affect this thread.
self.assertTrue(save_context.in_save_context())
self.assertTrue(save_context.get_save_options().save_debug_info)
continue_thread.set()
t.join()
# Another thread exiting SaveContext shouldn't affect this thread.
self.assertTrue(save_context.in_save_context())
self.assertTrue(save_context.get_save_options().save_debug_info)
self.assertFalse(save_context.in_save_context())
with self.assertRaisesRegex(ValueError, 'not in a SaveContext'):
save_context.get_save_options()
def resource_handle(self):
if context.executing_eagerly() or save_context.in_save_context():
return self._coordinator_instance.resource_handle
else:
self._maybe_build_distributed_table()
closure, spec = self.resource_handle_call_time_value()
return ops.get_default_graph().capture_call_time_value(
closure,
spec,
default_value=self._coordinator_instance.resource_handle)
def restore(self, restored_tensors, restored_shapes):
restored_tensor = restored_tensors[0]
if restored_shapes is not None:
restored_tensor = array_ops.reshape(restored_tensor,
restored_shapes[0])
# Copy the restored tensor to the variable's device.
device = "" if save_context.in_save_context() else self._var_device
with ops.device(device):
restored_tensor = array_ops.identity(restored_tensor)
return resource_variable_ops.shape_safe_assign_variable_handle(
self.handle_op, self._var_shape, restored_tensor)
def __init__(self, strategy, wrapped_creator):
self._coordinator_instance = wrapped_creator()
self._wrapped_creator = wrapped_creator
self._coordinator = strategy._cluster_coordinator
# self._distributed_table is a RemoteValue mapping worker_index to
# RemoteValue that wraps a resource handle on the worker
self._distributed_table = None
self._distributed_table_creation_lock = threading.Lock()
if not save_context.in_save_context():
self._maybe_build_distributed_table()
def handle(self):
if save_context.in_save_context() or context.executing_eagerly():
return self._vars[0].handle
if tpu_util.enclosing_tpu_context() is None:
raise NotImplementedError('TPUReplicatedVariable.handle is not available '
'outside tpu context or save context')
else:
with tpu_util.outside_or_skip_tpu_context():
return xla_sharding.replicate(
tpu_partition_ops.tpu_partitioned_input(
[v.handle for v in self._vars], partition_dim=-1))
def __init__(self, strategy, wrapped_creator):
distribute_lib.distribution_strategy_input_api_counter.get_cell(
self.__class__.__name__,
"PSSDistributedLookupTable").increase_by(1)
self._coordinator_instance = wrapped_creator()
self._wrapped_creator = wrapped_creator
self._coordinator = strategy._cluster_coordinator
# self._distributed_table is a RemoteValue mapping worker_index to
# RemoteValue that wraps a resource handle on the worker
self._distributed_table = None
self._distributed_table_creation_lock = threading.Lock()
if not save_context.in_save_context():
self._maybe_build_distributed_table()
def is_saving_non_distributed():
"""Returns whether we're saving a non-distributed version of the model.
It returns True iff we are in saving context and are saving a non-distributed
version of the model. That is, SaveOptions.experimental_variable_policy is
NONE.
Returns:
A boolean.
"""
if not save_context.in_save_context():
return False
options = save_context.get_save_options()
return (options is not None and options.experimental_variable_policy !=
save_options.VariablePolicy.EXPAND_DISTRIBUTED_VARIABLES)
def mark_as_unsaveable():
"""Marks the function as unsaveable if not inside save context."""
if ops.inside_function() and not save_context.in_save_context():
ops.get_default_graph().mark_as_unsaveable("""
ConcreteFunction that uses distributed variables in certain way cannot be saved.
If you're saving with
tf.saved_model.save(..., signatures=f.get_concrete_function())
do
@tf.function(input_signature=...)
def f_with_input_signature():
...
tf.saved_model.save(..., signatures=f_with_input_signature)`
instead.""")
def _make_execution_context() -> ExecutionContext:
"""Generates an ExecutionContext based on current contextual info."""
ctx = context.context()
# Don't need to open an init_scope if the _cache_key call is in eager mode
# already.
executing_eagerly = ctx.executing_eagerly()
parent_graph = None
xla_context_id = 0
if not executing_eagerly:
# We want to force function retracing for each different
# XLAControlFlowContext, so add `xla_context_id` to the cache key.
xla_context = _enclosing_xla_context()
if xla_context is not None and xla_context.RequiresUniqueFunctionRetracing(
):
xla_context_id = id(xla_context)
with ops.init_scope():
# The graph, or whether we're executing eagerly, should be a part of the
# cache key so we don't improperly capture tensors such as variables.
executing_eagerly = ctx.executing_eagerly()
parent_graph = None if executing_eagerly else ops.get_default_graph(
)
# pylint: disable=protected-access
default_graph = ops.get_default_graph()
# TODO(b/117617952): The current distribution strategy will affect graph
# building (e.g. accessing different variables from different devices) and
# so requires retracing for each device.
strategy_stack = default_graph._distribution_strategy_stack
uses_distribution_strategy = (strategy_stack
and strategy_stack[-1].strategy.extended.
_retrace_functions_for_each_device)
if executing_eagerly:
colocation_stack = ()
if uses_distribution_strategy:
device_functions = (pydev.merge_device(ctx.device_name), )
else:
device_functions = ()
else:
colocation_stack = tuple(default_graph._colocation_stack.peek_objs())
if (uses_distribution_strategy
or func_graph_module.device_stack_has_callable(
default_graph._device_function_stack)):
# Putting the device in the cache key ensures that call-site device
# annotations are respected.
device_functions = tuple(
default_graph._device_functions_outer_to_inner)
else:
device_functions = ()
in_cross_replica_context = False
try:
in_cross_replica_context = (strategy_stack[-1].replica_context is None) # pylint: disable=protected-access
except (AttributeError, IndexError):
pass
if save_context.in_save_context():
variable_policy = (
save_context.get_save_options().experimental_variable_policy)
else:
variable_policy = None
return ExecutionContext(parent_graph, device_functions, colocation_stack,
in_cross_replica_context, variable_policy,
xla_context_id)
def variables(self):
"""The list of `Variable`s that make up the shards of this object."""
if save_context.in_save_context():
return [self._saving_variable]
return self._variables
def variables(self):
"""The list of `Variables`."""
if save_context.in_save_context():
return [self._vars[0]]
return self._vars