Returns the default graph for the current thread.
Aliases:
tf.get_default_graph()
The returned graph will be the innermost graph on which a Graph.as_default() context has been entered, or a global default graph if none has been explicitly created.
NOTE: The default graph is a property of the current thread. If you create a new thread, and wish to use the default graph in that thread, you must explicitly add a with g.as_default(): in that thread's function.
Returns:
The default Graph being used in the current thread.
