Initial commit

crates/training/rtx-federated/src/byzantine/trimmed_mean.rs

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+//! Trimmed mean Byzantine-robust aggregation
+
+use super::{ByzantineConfig, ByzantineRobust};
+use crate::aggregation::ModelUpdate;
+use crate::error::{FederatedError, Result};
+use async_trait::async_trait;
+use uuid::Uuid;
+
+#[derive(Debug)]
+pub struct TrimmedMean {
+    trim_fraction: f64,
+    coordinate_wise: bool,
+}
+
+impl TrimmedMean {
+    pub async fn new(trim_fraction: f64) -> Result<Self> {
+        Ok(Self {
+            trim_fraction,
+            coordinate_wise: true,
+        })
+    }
+}
+
+#[async_trait]
+impl ByzantineRobust for TrimmedMean {
+    async fn filter_updates(&self, updates: &[ModelUpdate]) -> Result<Vec<ModelUpdate>> {
+        if updates.is_empty() {
+            return Err(FederatedError::NoUpdatesCollected);
+        }
+        // Simplified: return all updates for now
+        Ok(updates.to_vec())
+    }
+
+    async fn detect_malicious_clients(&self, _updates: &[ModelUpdate]) -> Result<Vec<Uuid>> {
+        Ok(Vec::new())
+    }
+
+    fn get_robustness_config(&self) -> ByzantineConfig {
+        ByzantineConfig::TrimmedMean {
+            trim_fraction: self.trim_fraction,
+            coordinate_wise: self.coordinate_wise,
+        }
+    }
+
+    async fn update_state(&mut self, _round: usize, _updates: &[ModelUpdate]) -> Result<()> {
+        Ok(())
+    }
+
+    fn name(&self) -> &'static str {
+        "TrimmedMean"
+    }
+}