From 51c3d93a67d22b158af0ebff4623a7b7f55c9ecc Mon Sep 17 00:00:00 2001
From: Agnes Leroy <agnes.leroy@zama.ai>
Date: Fri, 28 Jan 2022 13:53:02 +0100
Subject: [PATCH] fix(concrete_npe): fix base log in the pbs noise

---
 concrete-npe/src/operators.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/concrete-npe/src/operators.rs b/concrete-npe/src/operators.rs
index 7638b7b681..733832fc44 100644
--- a/concrete-npe/src/operators.rs
+++ b/concrete-npe/src/operators.rs
@@ -527,6 +527,7 @@ where
 
     Variance(res)
 }
+
 /// Computes the dispersion of the bits greater than $q$ after a modulus switching.
 /// # Example
 /// ```rust
@@ -709,7 +710,7 @@ where
 {
     let n = lwe_mask_size.0 as f64;
     let k = rlwe_mask_size.0 as f64;
-    let b = base_log.0 as f64;
+    let b = (1 << base_log.0) as f64;
     let l = level.0 as f64;
     let b2l = f64::powf(b, 2. * l) as f64;
     let big_n = poly_size.0 as f64;