From 02991a7eb5cfecfb4c1cfbd6a5ce7a073fda5a10 Mon Sep 17 00:00:00 2001
From: YannAhlgrim <yann@ahlgrim.net>
Date: Sat, 25 Apr 2026 11:00:14 +0200
Subject: [PATCH] no grad if frozen in forward pass

---
 src/models/head.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/models/head.py b/src/models/head.py
index f846486..4f17237 100644
--- a/src/models/head.py
+++ b/src/models/head.py
@@ -13,7 +13,11 @@ class ViTClassifier(nn.Module):
 
     def forward(self, x):
         # ViT -> (B, N, D)
-        features = self.encoder(x)
+        if any(p.requires_grad for p in self.encoder.parameters()):
+            features = self.encoder(x)
+        else:
+            with torch.no_grad():
+                features = self.encoder(x)
 
         # Average Pool -> (B, D)
         avg_embed = features.mean(dim=1)