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Manages dependencies on other objects.
Inherits From: CheckpointableBase
Trackable objects may have dependencies: other Trackable objects
which should be saved if the object declaring the dependency is saved. A
correctly saveable program has a dependency graph such that if changing a
global variable affects an object (e.g. changes the behavior of any of its
methods) then there is a chain of dependencies from the influenced object to
the variable.
Dependency edges have names, and are created implicitly when a
Trackable object is assigned to an attribute of another
Trackable object. For example:
obj = Trackable()
obj.v = ResourceVariable(0.)
The Trackable object obj now has a dependency named "v" on a
variable.
Trackable objects may specify Tensors to be saved and restored
directly (e.g. a Variable indicating how to save itself) rather than through
dependencies on other objects. See
Trackable._gather_saveables_for_checkpoint for details.