reset_default_graph()

    Clears the default graph stack and resets the global default graph.

    

    NOTE: The default graph is a property of the current thread. This

    function applies only to the current thread.  Calling this function while

    a `tf.Session` or `tf.InteractiveSession` is active will result in undefined

    behavior. Using any previously created `tf.Operation` or `tf.Tensor` objects

    after calling this function will result in undefined behavior.

    Raises:

      AssertionError: If this function is called within a nested graph.