From 003160dc479daa7fb22e63a03c18bb9511a84c03 Mon Sep 17 00:00:00 2001
From: huisman <23581164+huisman@users.noreply.github.com>
Date: Wed, 29 Oct 2025 21:40:46 +0100
Subject: [PATCH 1/2] Update topic mapping when all documents match zero-shot
 topics

Fix topic labels when all documents match zero-shot topics by updating the topic id mapping even when all documents are matched with zero-shot topics
---
 bertopic/_bertopic.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/bertopic/_bertopic.py b/bertopic/_bertopic.py
index 8c27ba14..bfe84691 100644
--- a/bertopic/_bertopic.py
+++ b/bertopic/_bertopic.py
@@ -494,6 +494,19 @@ def fit_transform(
                     documents, embeddings, assigned_documents, assigned_embeddings
                 )
         else:
+            # Update topic id to zeroshot topic id mapping
+            self._topic_id_to_zeroshot_topic_idx = {
+                new_topic_id: zeroshot_topic_id
+                for new_topic_id, zeroshot_topic_id in enumerate(set(assigned_documents.Topic))
+            }
+
+            # All documents matches zero-shot topics
+            documents = assigned_documents
+            embeddings = assigned_embeddings
+
+             # Update topic sizes
+            self._update_topic_size(documents)
+
             # All documents matches zero-shot topics
             documents = assigned_documents
             embeddings = assigned_embeddings

From 4a3b74a50874a33b4f60c544bb1fafec515f6b5c Mon Sep 17 00:00:00 2001
From: huisman <23581164+huisman@users.noreply.github.com>
Date: Wed, 29 Oct 2025 21:54:55 +0100
Subject: [PATCH 2/2] Fix extra space before comment

---
 bertopic/_bertopic.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bertopic/_bertopic.py b/bertopic/_bertopic.py
index bfe84691..d584a598 100644
--- a/bertopic/_bertopic.py
+++ b/bertopic/_bertopic.py
@@ -504,7 +504,7 @@ def fit_transform(
             documents = assigned_documents
             embeddings = assigned_embeddings
 
-             # Update topic sizes
+            # Update topic sizes
             self._update_topic_size(documents)
 
             # All documents matches zero-shot topics