From 2d600ccb5b758ab2b046cdbe0fb460607136359d Mon Sep 17 00:00:00 2001
From: Sebastian Raschka <mail@sebastianraschka.com>
Date: Wed, 18 Feb 2026 22:35:57 -0500
Subject: [PATCH] Use correct input in layernorm example (#960)

* Update CI

* Use correct example in layernorm section

* update
---
 ch04/01_main-chapter-code/ch04.ipynb | 30 ++++++++++++++++++----------
 reasoning-from-scratch               |  2 +-
 2 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/ch04/01_main-chapter-code/ch04.ipynb b/ch04/01_main-chapter-code/ch04.ipynb
index 59bb28c..9df7822 100644
--- a/ch04/01_main-chapter-code/ch04.ipynb
+++ b/ch04/01_main-chapter-code/ch04.ipynb
@@ -38,9 +38,9 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "matplotlib version: 3.10.0\n",
-      "torch version: 2.6.0\n",
-      "tiktoken version: 0.9.0\n"
+      "matplotlib version: 3.10.8\n",
+      "torch version: 2.10.0\n",
+      "tiktoken version: 0.12.0\n"
      ]
     }
    ],
@@ -492,8 +492,8 @@
      "output_type": "stream",
      "text": [
       "Mean:\n",
-      " tensor([[    -0.0000],\n",
-      "        [     0.0000]], grad_fn=<MeanBackward1>)\n",
+      " tensor([[-0.0000],\n",
+      "        [ 0.0000]], grad_fn=<MeanBackward1>)\n",
       "Variance:\n",
       " tensor([[1.0000],\n",
       "        [1.0000]], grad_fn=<VarBackward0>)\n"
@@ -564,8 +564,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "ln = LayerNorm(emb_dim=5)\n",
-    "out_ln = ln(batch_example)"
+    "ln = LayerNorm(emb_dim=6)\n",
+    "out_ln = ln(out)"
    ]
   },
   {
@@ -579,11 +579,11 @@
      "output_type": "stream",
      "text": [
       "Mean:\n",
-      " tensor([[    -0.0000],\n",
-      "        [     0.0000]], grad_fn=<MeanBackward1>)\n",
+      " tensor([[-0.0000],\n",
+      "        [-0.0000]], grad_fn=<MeanBackward1>)\n",
       "Variance:\n",
-      " tensor([[1.0000],\n",
-      "        [1.0000]], grad_fn=<VarBackward0>)\n"
+      " tensor([[0.9995],\n",
+      "        [0.9997]], grad_fn=<VarBackward0>)\n"
      ]
     }
    ],
@@ -595,6 +595,14 @@
     "print(\"Variance:\\n\", var)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "07220af7-cf53-48c8-8831-813a7088edea",
+   "metadata": {},
+   "source": [
+    "- Variance is not exactly 1 because we use `eps`"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "e136cfc4-7c89-492e-b120-758c272bca8c",
diff --git a/reasoning-from-scratch b/reasoning-from-scratch
index edcae1d..7b6a9d0 160000
--- a/reasoning-from-scratch
+++ b/reasoning-from-scratch
@@ -1 +1 @@
-Subproject commit edcae1d894192a2d7c036bfea43922cb140dea10
+Subproject commit 7b6a9d0f9090201dcb66c6242812d29aec379c77