You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: bench_multi_cause_graph.rs
    path of file: ./repos/deep_causality/deep_causality/benches/benchmarks
    
    the code of the file until where you have to start completion: // SPDX-License-Identifier: MIT
// Copyright (c) "2023" . The DeepCausality Authors. All Rights Reserved.

use criterion::{criterion_group, Criterion};

use deep_causality::prelude::*;

use crate::benchmarks::utils_linear_graph;

fn small_multi_layer_graph_benchmark(criterion: &mut Criterion) {
    let (g, data) = utils_linear_graph::get_small_multi_cause_graph_and_data();

    criterion.bench_function("small_multi_layer_graph_rea
    
fn small_multi_layer_graph_benchmark(criterion: &mut Criterion) {
    let (g, data) = utils_linear_graph::get_small_multi_cause_graph_and_data();

    criterion.bench_function("small_multi_layer_graph_reason_all_causes", |bencher| {
        bencher.iter(|| g.reason_all_causes(&data, None).unwrap())
    });

    let index = data.len() / 2;

    criterion.bench_function(
        "small_multi_layer_graph_reason_subgraph_from_cause",
        |bencher| bencher.iter(|| g.reason_subgraph_from_cause(index, &data, None).unwrap()),
    );

    let start_index = 0;
    let stop_index = 1;

    criterion.bench_function(
        "small_multi_layer_graph_reason_shortest_path_between_causes",
        |bencher| {
            bencher.iter(|| {
                g.reason_shortest_path_between_causes(start_index, stop_index, &data, None)
                    .unwrap()
            })
        },
    );

    let obs = 0.99;

    criterion.bench_function("small_multi_layer_graph_reason_single_cause", |bencher| {
        bencher.iter(|| g.reason_single_cause(index, &[obs]).unwrap())
    });
}