From a0bba7173f147f8cf43613d519382ff2d8774ef7 Mon Sep 17 00:00:00 2001
From: Tissevert <tissevert+devel@marvid.fr>
Date: Sat, 16 Mar 2024 15:49:23 +0100
Subject: [PATCH] Avoid division by zero when computing the scalar product of
 two quotes

---
 memory.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/memory.py b/memory.py
index b5989da..bac5b69 100644
--- a/memory.py
+++ b/memory.py
@@ -55,7 +55,8 @@ We define a similarity measure on sets which counts the number of elements
 they have in common
 """
 def scalar(a, b):
-    return len(a.intersection(b))/sqrt(len(a)*len(b))
+    sizeProduct = len(a)*len(b)
+    return len(a.intersection(b))/sqrt(sizeProduct) if sizeProduct > 0 else 0
 
 def find_best_quote(db, user_input):
     indexed_input = index(user_input)