From 25b384297d71b30350b8644dcef3cb420a7ecbc8 Mon Sep 17 00:00:00 2001
From: Phil Wang <lucidrains@gmail.com>
Date: Fri, 28 Jan 2022 17:49:58 -0800
Subject: [PATCH] return None from extractor if no attention layers

---
 setup.py                | 2 +-
 vit_pytorch/recorder.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/setup.py b/setup.py
index ca864bc..a815baa 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@ from setuptools import setup, find_packages
 setup(
   name = 'vit-pytorch',
   packages = find_packages(exclude=['examples']),
-  version = '0.26.5',
+  version = '0.26.6',
   license='MIT',
   description = 'Vision Transformer (ViT) - Pytorch',
   author = 'Phil Wang',
diff --git a/vit_pytorch/recorder.py b/vit_pytorch/recorder.py
index 3d3ad7e..7ecac2c 100644
--- a/vit_pytorch/recorder.py
+++ b/vit_pytorch/recorder.py
@@ -55,5 +55,5 @@ class Recorder(nn.Module):
         target_device = self.device if self.device is not None else img.device
         recordings = tuple(map(lambda t: t.to(target_device), self.recordings))
 
-        attns = torch.stack(recordings, dim = 1)
+        attns = torch.stack(recordings, dim = 1) if len(recordings) > 0 else None
         return pred, attns