From ff8a275d47d6427986b9999185b587d812c34a62 Mon Sep 17 00:00:00 2001
From: jgrusewski <jgrusewski@localhost>
Date: Wed, 25 Feb 2026 23:55:35 +0100
Subject: [PATCH] fix(ml): widen flaky QAT checkpoint test range + use PVC
 sccache
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- Widen observer checkpoint test bounds from 4σ to 5σ — random
  calibration data can exceed 4.0 with 100 batches of normal(0,1)
- Override SCCACHE_BUCKET="" in .rust-base so check/test jobs use
  PVC-backed SCCACHE_DIR instead of S3

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 .gitlab-ci.yml                           |  3 +++
 crates/ml/src/memory_optimization/qat.rs | 12 ++++++------
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index db8446821..178391673 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -136,6 +136,9 @@ build-infra-runner:
   tags:
     - kapsule
     - rust
+  variables:
+    # Override SCCACHE_BUCKET (CI variable) so sccache uses SCCACHE_DIR (PVC) instead of S3
+    SCCACHE_BUCKET: ""
 
 # --------------------------------------------------------------------------
 # Stage 1: cargo check + clippy
diff --git a/crates/ml/src/memory_optimization/qat.rs b/crates/ml/src/memory_optimization/qat.rs
index 2fad69ee2..a7299707b 100644
--- a/crates/ml/src/memory_optimization/qat.rs
+++ b/crates/ml/src/memory_optimization/qat.rs
@@ -1593,13 +1593,13 @@ mod tests {
         // - Expected zero_point = 127 (symmetric quantization)
 
         assert!(
-            loaded_min >= -4.0 && loaded_min <= 0.0,
-            "Loaded min out of expected range: {} (expected [-4.0, 0.0])",
+            loaded_min >= -5.0 && loaded_min <= 0.0,
+            "Loaded min out of expected range: {} (expected [-5.0, 0.0])",
             loaded_min
         );
         assert!(
-            loaded_max >= 0.0 && loaded_max <= 4.0,
-            "Loaded max out of expected range: {} (expected [0.0, 4.0])",
+            loaded_max >= 0.0 && loaded_max <= 5.0,
+            "Loaded max out of expected range: {} (expected [0.0, 5.0])",
             loaded_max
         );
         assert!(
@@ -1614,8 +1614,8 @@ mod tests {
         );
 
         println!("   ✓ Statistics within expected ranges");
-        println!("     - Min: {:.6} (expected [-4.0, 0.0])", loaded_min);
-        println!("     - Max: {:.6} (expected [0.0, 4.0])", loaded_max);
+        println!("     - Min: {:.6} (expected [-5.0, 0.0])", loaded_min);
+        println!("     - Max: {:.6} (expected [0.0, 5.0])", loaded_max);
         println!("     - Scale: {:.6} (expected (0.0, 0.1))", loaded_scale);
         println!("     - Zero point: {} (expected 127)", loaded_zero_point);