
def retrieve_neighbors():
    """
    Retrieve and rank k-hop neighbors from the graph.
    """
    pass 

def retrieve_subgraph():
    """
    Retrieve a relevant subgraph based on criteria.
    """
    pass

def retrieve_path():
    """
    Retrieve optimal paths between nodes.
    """
    pass

def retrieve_strategies():
    """
    Retrieve memory strategies for dialog management.
    """
    pass