From 1fe1d59be4942c77a12082cd7920c452dd729db7 Mon Sep 17 00:00:00 2001
From: Christoph Boeddeker <cbj@mail.uni-paderborn.de>
Date: Mon, 21 Jul 2025 17:07:44 +0200
Subject: [PATCH] kernel: fix edge case

---
 paderbox/array/kernel.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/paderbox/array/kernel.py b/paderbox/array/kernel.py
index d7793cab..1022de65 100644
--- a/paderbox/array/kernel.py
+++ b/paderbox/array/kernel.py
@@ -133,6 +133,8 @@ def _ai_dilate_erode(ai, khalf):
 
     """
     pairs = np.array(ai.normalized_intervals)
+    if pairs.size == 0:
+        pairs = pairs.reshape(0, 2)
     assert pairs.shape[-1] == 2, pairs.shape
     if ai.inverse_mode:
         khalf = -khalf
@@ -157,6 +159,8 @@ def ai_dilate(ai, kernel_size):
     '   ██████   '
     '  ████████  '
     '████████████'
+    >>> ai_dilate(pb.array.interval.zeros(10), 3)
+    ArrayInterval("", shape=(10,))
 
 
     """