Added new NSGA3 example

optirustic/examples/nsga3.rs → optirustic/examples/nsga3_dtlz1.rs

@@ -8,7 +8,7 @@ use optirustic::algorithms::{
     Algorithm, MaxGeneration, NSGA3Arg, Nsga3NumberOfIndividuals, StoppingConditionType, NSGA3,
 };
 use optirustic::core::builtin_problems::DTLZ1Problem;
-use optirustic::operators::{PolynomialMutationArgs, SimulatedBinaryCrossoverArgs};
+use optirustic::operators::SimulatedBinaryCrossoverArgs;
 use optirustic::utils::{DasDarren1998, NumberOfPartitions};
 
 /// Solve the DTLZ1 problem from Deb et al. (2013) with 3 objectives. This is a problem where the
@@ -18,7 +18,7 @@ use optirustic::utils::{DasDarren1998, NumberOfPartitions};
 ///
 /// Make sure to compile this in release mode to speed up the calculation:
 ///
-/// `cargo run --example nsga3 --release`
+/// `cargo run --example nsga3_dtlz1 --release`
 fn main() -> Result<(), Box<dyn Error>> {
     // Add log
     env_logger::builder().filter_level(LevelFilter::Info).init();
@@ -32,7 +32,6 @@ fn main() -> Result<(), Box<dyn Error>> {
 
     // Set the number of partitions to create the reference points for the NSGA3 algorithm. This
     // uses one layer of 12 uniform gaps
-    // let number_of_partitions = NumberOfPartitions::OneLayer(6);
     let number_of_partitions = NumberOfPartitions::OneLayer(12);
     // NSGA3 internally uses the Das & Darren approach to generate the points. This is also
     // available using:
@@ -46,17 +45,16 @@ fn main() -> Result<(), Box<dyn Error>> {
     let crossover_operator_options = SimulatedBinaryCrossoverArgs {
         distribution_index: 30.0,
         crossover_probability: 1.0,
-        variable_probability: 0.5,
+        ..SimulatedBinaryCrossoverArgs::default()
     };
-    let mutation_operator_options = PolynomialMutationArgs::default(&problem);
 
     // Set up the NSGA3 algorithm
     let args = NSGA3Arg {
         // number of individuals from the paper (possibly equal to number of reference points)
         number_of_individuals: Nsga3NumberOfIndividuals::Custom(92),
         number_of_partitions,
         crossover_operator_options: Some(crossover_operator_options),
-        mutation_operator_options: Some(mutation_operator_options),
+        mutation_operator_options: None,
         // stop at generation 400
         stopping_condition: StoppingConditionType::MaxGeneration(MaxGeneration(400)),
         parallel: None,
@@ -77,7 +75,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         .join("results");
 
     algo.save_to_json(&destination, Some("DTLZ1_3obj"))?;
-
     // algo.plot_objectives("optirustic/examples/results/DTLZ1_3obj.png")?;
+
     Ok(())
 }

optirustic/examples/nsga3_dtlz2.rs

@@ -0,0 +1,77 @@
+use std::env;
+use std::error::Error;
+use std::path::PathBuf;
+
+use log::LevelFilter;
+
+use optirustic::algorithms::{
+    Algorithm, MaxGeneration, NSGA3Arg, Nsga3NumberOfIndividuals, StoppingConditionType, NSGA3,
+};
+use optirustic::core::builtin_problems::DTLZ2Problem;
+use optirustic::operators::SimulatedBinaryCrossoverArgs;
+use optirustic::utils::{DasDarren1998, NumberOfPartitions};
+
+/// Solve the DTLZ2 problem from Deb et al. (2013) with 3 objectives.
+///
+/// Make sure to compile this in release mode to speed up the calculation:
+///
+/// `cargo run --example nsga3_dtlz2 --release`
+fn main() -> Result<(), Box<dyn Error>> {
+    // Add log
+    env_logger::builder().filter_level(LevelFilter::Info).init();
+
+    let number_objectives: usize = 3;
+    // Set the number of variables to use in the DTLZ1 problem
+    let k: usize = 10;
+    let number_variables: usize = number_objectives + k - 1;
+    // Get the built-in problem
+    let problem = DTLZ2Problem::create(number_variables, number_objectives)?;
+
+    // Set the number of partitions to create the reference points for the NSGA3 algorithm. This
+    // uses one layer of 12 uniform gaps
+    // let number_of_partitions = NumberOfPartitions::OneLayer(6);
+    let number_of_partitions = NumberOfPartitions::OneLayer(12);
+    // NSGA3 internally uses the Das & Darren approach to generate the points. This is also
+    // available using:
+    let das_darren = DasDarren1998::new(number_objectives, &number_of_partitions)?;
+    println!(
+        "Number of reference points to generate: {}",
+        das_darren.number_of_points()
+    );
+
+    // Customise the SBX and PM operators like in the paper
+    let crossover_operator_options = SimulatedBinaryCrossoverArgs {
+        distribution_index: 30.0,
+        crossover_probability: 1.0,
+        ..SimulatedBinaryCrossoverArgs::default()
+    };
+
+    // Set up the NSGA3 algorithm
+    let args = NSGA3Arg {
+        // number of individuals from the paper (possibly equal to number of reference points)
+        number_of_individuals: Nsga3NumberOfIndividuals::Custom(92),
+        number_of_partitions,
+        crossover_operator_options: Some(crossover_operator_options),
+        mutation_operator_options: None,
+        // stop at generation 400
+        stopping_condition: StoppingConditionType::MaxGeneration(MaxGeneration(400)),
+        parallel: None,
+        export_history: None,
+        // to reproduce results
+        seed: Some(1),
+    };
+
+    // Initialise the algorithm
+    let mut algo = NSGA3::new(problem, args).unwrap();
+
+    // Run the algorithm
+    algo.run()?;
+
+    // Export the last results to a JSON file
+    let destination = PathBuf::from(&env::current_dir().unwrap())
+        .join("examples")
+        .join("results");
+    algo.save_to_json(&destination, Some("DTLZ2_3obj"))?;
+
+    Ok(())
+}

optirustic/examples/reference_points_1layer.rs

@@ -1,3 +1,6 @@
+use std::env;
+use std::path::PathBuf;
+
 use optirustic::core::OError;
 use optirustic::utils::{DasDarren1998, NumberOfPartitions};
 
@@ -16,5 +19,8 @@ fn main() -> Result<(), OError> {
     println!("Weights = {:?}", weights);
 
     // Save the charts of points to inspect them
-    m.plot("ref_points_3obj_5gaps.png")
+    let out_path = PathBuf::from(&env::current_dir().unwrap())
+        .join("examples")
+        .join("results");
+    m.plot(&out_path.join("ref_points_3obj_5gaps.png"))
 }

optirustic/examples/reference_points_2layers.rs

@@ -1,3 +1,6 @@
+use std::env;
+use std::path::PathBuf;
+
 use optirustic::core::OError;
 use optirustic::utils::{DasDarren1998, NumberOfPartitions, TwoLayerPartitions};
 
@@ -20,5 +23,8 @@ fn main() -> Result<(), OError> {
     println!("Weights = {:?}", weights);
 
     // Save the charts of points to inspect them
-    m.plot("ref_points_2layers_3obj_5gaps.png")
+    let out_path = PathBuf::from(&env::current_dir().unwrap())
+        .join("examples")
+        .join("results");
+    m.plot(&out_path.join("ref_points_2layers_3obj_5gaps.png"))
 }