Function create_graph 

pub fn create_graph(nodes: &[(&str, Vec<&str>)]) -> Result<DependencyGraph>

Create a simple dependency graph from node ID mappings

Example

use mecha10::dependency::create_graph;

let graph = create_graph(&[
    ("camera", vec![]),
    ("vision", vec!["camera"]),
    ("planner", vec!["vision"]),
])?;