test: bound dropout example training

examples/dropout_example.rs

@@ -14,6 +14,12 @@ use rust_lstm::{
     LSTMNetwork, LayerDropoutConfig,
 };
 
+pub const DEMO_TRAIN_SEQUENCES: usize = 8;
+pub const DEMO_SEQUENCE_LENGTH: usize = 4;
+pub const DEMO_HIDDEN_SIZE: usize = 4;
+pub const DEMO_EPOCHS: usize = 4;
+pub const DEMO_PRINT_EVERY: usize = 1;
+
 fn main() {
     println!("Rust LSTM Dropout Example");
     println!("=========================\n");
@@ -190,7 +196,7 @@ fn demonstrate_training_with_dropout() {
     println!("------------------------");
 
     let input_size = 2;
-    let hidden_size = 4;
+    let hidden_size = DEMO_HIDDEN_SIZE;
     let num_layers = 2;
 
     // Create network with comprehensive dropout
@@ -204,19 +210,10 @@ fn demonstrate_training_with_dropout() {
     let loss_function = MSELoss;
     let optimizer = Adam::new(0.001);
     let mut trainer = LSTMTrainer::new(network, loss_function, optimizer);
-
-    // Configure training
-    let config = TrainingConfig {
-        epochs: 20,
-        print_every: 5,
-        clip_gradient: Some(1.0),
-        log_lr_changes: false,
-        early_stopping: None,
-    };
-    trainer = trainer.with_config(config);
+    trainer = trainer.with_config(dropout_training_config());
 
     // Generate simple training data (sine wave prediction)
-    let train_data = generate_sine_wave_data(10, 5);
+    let train_data = generate_sine_wave_data(DEMO_TRAIN_SEQUENCES, DEMO_SEQUENCE_LENGTH);
 
     println!("Training LSTM with dropout regularization...");
     println!(
@@ -251,7 +248,17 @@ fn demonstrate_training_with_dropout() {
     println!("\nTraining completed with dropout regularization!");
 }
 
-fn generate_sine_wave_data(
+pub fn dropout_training_config() -> TrainingConfig {
+    TrainingConfig {
+        epochs: DEMO_EPOCHS,
+        print_every: DEMO_PRINT_EVERY,
+        clip_gradient: Some(1.0),
+        log_lr_changes: false,
+        early_stopping: None,
+    }
+}
+
+pub fn generate_sine_wave_data(
     num_sequences: usize,
     sequence_length: usize,
 ) -> Vec<(Vec<Array2<f64>>, Vec<Array2<f64>>)> {

tests/example_training_bounds_test.rs

@@ -18,6 +18,10 @@ mod learning_rate_scheduling;
 #[path = "../examples/advanced_lr_scheduling.rs"]
 mod advanced_lr_scheduling;
 
+#[allow(dead_code)]
+#[path = "../examples/dropout_example.rs"]
+mod dropout_example;
+
 use std::hint::black_box;
 
 #[test]
@@ -234,6 +238,64 @@ fn learning_rate_scheduling_uses_small_deterministic_fixture() {
     );
 }
 
+#[test]
+fn dropout_example_applies_bounded_training_config() {
+    let config = dropout_example::dropout_training_config();
+
+    assert!(
+        black_box(config.epochs) <= 4,
+        "dropout_example should avoid the default 100-epoch training config"
+    );
+    assert!(
+        black_box(config.print_every) > 0,
+        "dropout_example progress logging should stay enabled"
+    );
+    assert!(
+        black_box(config.print_every) <= black_box(config.epochs),
+        "dropout_example progress logging should not exceed the epoch budget"
+    );
+    assert!(
+        config.early_stopping.is_none(),
+        "dropout_example should avoid hidden early-stopping work"
+    );
+    assert!(
+        black_box(dropout_example::DEMO_HIDDEN_SIZE) <= 4,
+        "dropout_example should keep demo hidden size bounded"
+    );
+}
+
+#[test]
+fn dropout_example_uses_small_deterministic_fixture() {
+    let first = dropout_example::generate_sine_wave_data(
+        black_box(dropout_example::DEMO_TRAIN_SEQUENCES),
+        black_box(dropout_example::DEMO_SEQUENCE_LENGTH),
+    );
+    let second = dropout_example::generate_sine_wave_data(
+        black_box(dropout_example::DEMO_TRAIN_SEQUENCES),
+        black_box(dropout_example::DEMO_SEQUENCE_LENGTH),
+    );
+
+    assert_eq!(
+        first, second,
+        "dropout demo fixture should be deterministic"
+    );
+    assert!(
+        black_box(dropout_example::DEMO_TRAIN_SEQUENCES) <= 8,
+        "dropout_example should keep training sequence count bounded"
+    );
+    assert!(
+        black_box(dropout_example::DEMO_SEQUENCE_LENGTH) <= 4,
+        "dropout_example should keep each fixture sequence bounded"
+    );
+    assert!(
+        first.iter().all(|(inputs, targets)| {
+            inputs.len() == dropout_example::DEMO_SEQUENCE_LENGTH
+                && targets.len() == dropout_example::DEMO_SEQUENCE_LENGTH
+        }),
+        "generated fixtures should use the public demo sequence-length bound"
+    );
+}
+
 #[test]
 fn advanced_lr_scheduling_applies_bounded_configs_to_all_demo_paths() {
     let configs = [