diff --git a/doc/pub/day4/html/day4-bs.html b/doc/pub/day4/html/day4-bs.html
index c1cbe76..3bfdf15 100644
--- a/doc/pub/day4/html/day4-bs.html
+++ b/doc/pub/day4/html/day4-bs.html
@@ -493,7 +493,7 @@ <h1>Data Analysis and Machine Learning: Logistic Regression and Gradient Methods
 </center>
 <br>
 <center>
-<h4>November 7 and 14, 2022</h4>
+<h4>November 6, 12 and 13, 2023</h4>
 </center> <!-- date -->
 <br>
 
@@ -4748,7 +4748,7 @@ <h2 id="introducing-jax-https-jax-readthedocs-io-en-latest" class="anchor">Intro
 </footer>
 -->
 <center style="font-size:80%">
-<!-- copyright --> &copy; 1999-2022, Morten Hjorth-Jensen. Released under CC Attribution-NonCommercial 4.0 license
+<!-- copyright --> &copy; 1999-2023, Morten Hjorth-Jensen. Released under CC Attribution-NonCommercial 4.0 license
 </center>
 </body>
 </html>
diff --git a/doc/pub/day4/html/day4-reveal.html b/doc/pub/day4/html/day4-reveal.html
index 5595bd1..518f2ff 100644
--- a/doc/pub/day4/html/day4-reveal.html
+++ b/doc/pub/day4/html/day4-reveal.html
@@ -184,13 +184,13 @@ <h1 style="text-align: center;">Data Analysis and Machine Learning: Logistic Reg
 </center>
 <br>
 <center>
-<h4>November 7 and 14, 2022</h4>
+<h4>November 6, 12 and 13, 2023</h4>
 </center> <!-- date -->
 <br>
 
 
 <center style="font-size:80%">
-<!-- copyright --> &copy; 1999-2022, Morten Hjorth-Jensen. Released under CC Attribution-NonCommercial 4.0 license
+<!-- copyright --> &copy; 1999-2023, Morten Hjorth-Jensen. Released under CC Attribution-NonCommercial 4.0 license
 </center>
 </section>
 
diff --git a/doc/pub/day4/html/day4-solarized.html b/doc/pub/day4/html/day4-solarized.html
index c2009e4..ef8dfb9 100644
--- a/doc/pub/day4/html/day4-solarized.html
+++ b/doc/pub/day4/html/day4-solarized.html
@@ -387,7 +387,7 @@ <h1>Data Analysis and Machine Learning: Logistic Regression and Gradient Methods
 </center>
 <br>
 <center>
-<h4>November 7 and 14, 2022</h4>
+<h4>November 6, 12 and 13, 2023</h4>
 </center> <!-- date -->
 <br>
 
@@ -4618,7 +4618,7 @@ <h2 id="introducing-jax-https-jax-readthedocs-io-en-latest">Introducing <a href=
 
 <!-- ------------------- end of main content --------------- -->
 <center style="font-size:80%">
-<!-- copyright --> &copy; 1999-2022, Morten Hjorth-Jensen. Released under CC Attribution-NonCommercial 4.0 license
+<!-- copyright --> &copy; 1999-2023, Morten Hjorth-Jensen. Released under CC Attribution-NonCommercial 4.0 license
 </center>
 </body>
 </html>
diff --git a/doc/pub/day4/html/day4.html b/doc/pub/day4/html/day4.html
index c7059b8..5f6e5eb 100644
--- a/doc/pub/day4/html/day4.html
+++ b/doc/pub/day4/html/day4.html
@@ -464,7 +464,7 @@ <h1>Data Analysis and Machine Learning: Logistic Regression and Gradient Methods
 </center>
 <br>
 <center>
-<h4>November 7 and 14, 2022</h4>
+<h4>November 6, 12 and 13, 2023</h4>
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 <br>
 
@@ -4695,7 +4695,7 @@ <h2 id="introducing-jax-https-jax-readthedocs-io-en-latest">Introducing <a href=
 
 <!-- ------------------- end of main content --------------- -->
 <center style="font-size:80%">
-<!-- copyright --> &copy; 1999-2022, Morten Hjorth-Jensen. Released under CC Attribution-NonCommercial 4.0 license
+<!-- copyright --> &copy; 1999-2023, Morten Hjorth-Jensen. Released under CC Attribution-NonCommercial 4.0 license
 </center>
 </body>
 </html>
diff --git a/doc/pub/day4/ipynb/day4.ipynb b/doc/pub/day4/ipynb/day4.ipynb
index 2bba96c..5035771 100644
--- a/doc/pub/day4/ipynb/day4.ipynb
+++ b/doc/pub/day4/ipynb/day4.ipynb
@@ -2,7 +2,7 @@
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+   "id": "4c3f7e7f",
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-   "id": "fc355263",
+   "id": "ae415c7c",
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@@ -22,12 +22,12 @@
     "# Data Analysis and Machine Learning: Logistic Regression and Gradient Methods\n",
     "**Morten Hjorth-Jensen**, Department of Physics and Center for Computing in Science Education, University of Oslo, Norway and Department of Physics and Astronomy and Facility for Rare Ion Beams and National Superconducting Cyclotron Laboratory, Michigan State University, USA\n",
     "\n",
-    "Date: **November 7 and 14, 2022**"
+    "Date: **November 6, 12 and 13, 2023**"
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@@ -49,7 +49,7 @@
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@@ -183,7 +183,7 @@
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@@ -288,7 +288,7 @@
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@@ -301,7 +301,7 @@
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@@ -331,7 +331,7 @@
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@@ -384,7 +384,7 @@
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+   "id": "70d7f3e8",
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@@ -396,7 +396,7 @@
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@@ -406,7 +406,7 @@
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@@ -419,7 +419,7 @@
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@@ -484,7 +484,7 @@
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@@ -496,7 +496,7 @@
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@@ -576,7 +576,7 @@
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@@ -612,7 +612,7 @@
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@@ -623,7 +623,7 @@
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@@ -635,7 +635,7 @@
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@@ -646,7 +646,7 @@
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@@ -662,7 +662,7 @@
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+   "id": "a5620b5a",
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@@ -674,7 +674,7 @@
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+   "id": "8dbb3f49",
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@@ -684,7 +684,7 @@
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   {
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-   "id": "d69d3e5c",
+   "id": "60ada549",
    "metadata": {
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@@ -696,7 +696,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a66064ec",
+   "id": "dc330b3f",
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@@ -711,7 +711,7 @@
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   {
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@@ -723,7 +723,7 @@
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+   "id": "039d4696",
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@@ -734,7 +734,7 @@
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@@ -746,7 +746,7 @@
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@@ -758,7 +758,7 @@
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@@ -770,7 +770,7 @@
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+   "id": "da65918f",
    "metadata": {
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@@ -780,7 +780,7 @@
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-   "id": "bdef7068",
+   "id": "814a8e72",
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@@ -792,7 +792,7 @@
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@@ -806,7 +806,7 @@
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@@ -818,7 +818,7 @@
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@@ -828,7 +828,7 @@
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@@ -840,7 +840,7 @@
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@@ -850,7 +850,7 @@
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+   "id": "3fb19082",
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@@ -862,7 +862,7 @@
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@@ -873,7 +873,7 @@
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@@ -896,7 +896,7 @@
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@@ -908,7 +908,7 @@
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@@ -918,7 +918,7 @@
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@@ -930,7 +930,7 @@
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@@ -947,7 +947,7 @@
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@@ -962,7 +962,7 @@
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@@ -998,7 +998,7 @@
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@@ -1012,7 +1012,7 @@
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@@ -1057,7 +1057,7 @@
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@@ -1082,7 +1082,7 @@
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@@ -1094,7 +1094,7 @@
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@@ -1105,7 +1105,7 @@
   {
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-   "id": "43c0e723",
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@@ -1117,7 +1117,7 @@
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@@ -1130,7 +1130,7 @@
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@@ -1141,7 +1141,7 @@
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-   "id": "cf1cb05d",
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@@ -1196,7 +1196,7 @@
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@@ -1217,7 +1217,7 @@
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@@ -1234,7 +1234,7 @@
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@@ -1249,7 +1249,7 @@
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@@ -1259,7 +1259,7 @@
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@@ -1275,7 +1275,7 @@
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@@ -1287,7 +1287,7 @@
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@@ -1298,7 +1298,7 @@
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@@ -1310,7 +1310,7 @@
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@@ -1320,7 +1320,7 @@
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@@ -1334,7 +1334,7 @@
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@@ -1346,7 +1346,7 @@
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@@ -1356,7 +1356,7 @@
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@@ -1368,7 +1368,7 @@
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@@ -1380,7 +1380,7 @@
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@@ -1400,7 +1400,7 @@
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@@ -1416,7 +1416,7 @@
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@@ -1432,7 +1432,7 @@
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@@ -1443,7 +1443,7 @@
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@@ -1455,7 +1455,7 @@
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@@ -1465,7 +1465,7 @@
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@@ -1477,7 +1477,7 @@
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@@ -1487,7 +1487,7 @@
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@@ -1499,7 +1499,7 @@
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@@ -1521,7 +1521,7 @@
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@@ -1534,7 +1534,7 @@
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@@ -1547,7 +1547,7 @@
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@@ -1557,7 +1557,7 @@
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@@ -1575,7 +1575,7 @@
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@@ -1585,7 +1585,7 @@
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@@ -1600,7 +1600,7 @@
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@@ -1610,7 +1610,7 @@
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@@ -1624,7 +1624,7 @@
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@@ -1634,7 +1634,7 @@
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@@ -1648,7 +1648,7 @@
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@@ -1663,7 +1663,7 @@
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@@ -1680,7 +1680,7 @@
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@@ -1692,7 +1692,7 @@
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@@ -1706,7 +1706,7 @@
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@@ -1721,7 +1721,7 @@
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@@ -1733,7 +1733,7 @@
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@@ -1744,7 +1744,7 @@
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@@ -1772,7 +1772,7 @@
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@@ -1794,7 +1794,7 @@
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@@ -1816,7 +1816,7 @@
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@@ -1828,7 +1828,7 @@
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@@ -1865,7 +1865,7 @@
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@@ -1893,7 +1893,7 @@
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@@ -1923,7 +1923,7 @@
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@@ -1943,7 +1943,7 @@
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@@ -1955,7 +1955,7 @@
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@@ -1965,7 +1965,7 @@
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@@ -1977,7 +1977,7 @@
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@@ -1989,7 +1989,7 @@
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@@ -2001,7 +2001,7 @@
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@@ -2013,7 +2013,7 @@
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@@ -2024,7 +2024,7 @@
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@@ -2037,7 +2037,7 @@
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@@ -2049,7 +2049,7 @@
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@@ -2059,7 +2059,7 @@
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@@ -2071,7 +2071,7 @@
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@@ -2081,7 +2081,7 @@
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@@ -2092,7 +2092,7 @@
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@@ -2104,7 +2104,7 @@
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@@ -2116,7 +2116,7 @@
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@@ -2128,7 +2128,7 @@
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@@ -2139,7 +2139,7 @@
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@@ -2150,7 +2150,7 @@
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@@ -2162,7 +2162,7 @@
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@@ -2172,7 +2172,7 @@
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@@ -2184,7 +2184,7 @@
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@@ -2194,7 +2194,7 @@
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@@ -2206,7 +2206,7 @@
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@@ -2216,7 +2216,7 @@
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@@ -2228,7 +2228,7 @@
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@@ -2238,7 +2238,7 @@
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@@ -2250,7 +2250,7 @@
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@@ -2261,7 +2261,7 @@
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@@ -2292,7 +2292,7 @@
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@@ -2303,7 +2303,7 @@
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@@ -2317,7 +2317,7 @@
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@@ -2328,7 +2328,7 @@
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@@ -2341,7 +2341,7 @@
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@@ -2352,7 +2352,7 @@
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@@ -2370,7 +2370,7 @@
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@@ -2381,7 +2381,7 @@
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@@ -2396,7 +2396,7 @@
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@@ -2406,7 +2406,7 @@
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@@ -2420,7 +2420,7 @@
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@@ -2432,7 +2432,7 @@
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@@ -2443,7 +2443,7 @@
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@@ -2455,7 +2455,7 @@
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@@ -2466,7 +2466,7 @@
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@@ -2477,7 +2477,7 @@
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@@ -2489,7 +2489,7 @@
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@@ -2499,7 +2499,7 @@
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@@ -2511,7 +2511,7 @@
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@@ -2523,7 +2523,7 @@
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@@ -2535,7 +2535,7 @@
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@@ -2547,7 +2547,7 @@
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@@ -2558,7 +2558,7 @@
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@@ -2570,7 +2570,7 @@
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@@ -2580,7 +2580,7 @@
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@@ -2592,7 +2592,7 @@
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@@ -2602,7 +2602,7 @@
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@@ -2614,7 +2614,7 @@
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@@ -2634,7 +2634,7 @@
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@@ -2646,7 +2646,7 @@
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@@ -2656,7 +2656,7 @@
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@@ -2668,7 +2668,7 @@
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@@ -2678,7 +2678,7 @@
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@@ -2689,7 +2689,7 @@
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@@ -2701,7 +2701,7 @@
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@@ -2713,7 +2713,7 @@
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@@ -2738,7 +2738,7 @@
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@@ -2749,7 +2749,7 @@
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@@ -2789,7 +2789,7 @@
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@@ -2800,7 +2800,7 @@
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@@ -2812,7 +2812,7 @@
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@@ -2822,7 +2822,7 @@
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@@ -2834,7 +2834,7 @@
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@@ -2844,7 +2844,7 @@
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@@ -2856,7 +2856,7 @@
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@@ -2866,7 +2866,7 @@
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@@ -2915,7 +2915,7 @@
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@@ -2926,7 +2926,7 @@
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@@ -2938,7 +2938,7 @@
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@@ -2948,7 +2948,7 @@
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@@ -2960,7 +2960,7 @@
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@@ -2974,7 +2974,7 @@
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@@ -2990,7 +2990,7 @@
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@@ -3000,7 +3000,7 @@
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@@ -3012,7 +3012,7 @@
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@@ -3022,7 +3022,7 @@
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@@ -3034,7 +3034,7 @@
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@@ -3048,7 +3048,7 @@
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@@ -3058,7 +3058,7 @@
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@@ -3069,7 +3069,7 @@
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@@ -3084,7 +3084,7 @@
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@@ -3094,7 +3094,7 @@
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@@ -3106,7 +3106,7 @@
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@@ -3118,7 +3118,7 @@
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@@ -3133,7 +3133,7 @@
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@@ -3146,7 +3146,7 @@
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@@ -3203,7 +3203,7 @@
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@@ -3214,7 +3214,7 @@
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@@ -3241,7 +3241,7 @@
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@@ -3253,7 +3253,7 @@
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@@ -3265,7 +3265,7 @@
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@@ -3275,7 +3275,7 @@
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@@ -3289,7 +3289,7 @@
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@@ -3299,7 +3299,7 @@
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@@ -3311,7 +3311,7 @@
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@@ -3322,7 +3322,7 @@
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@@ -3337,7 +3337,7 @@
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@@ -3351,7 +3351,7 @@
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@@ -3362,7 +3362,7 @@
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@@ -3423,7 +3423,7 @@
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@@ -3445,7 +3445,7 @@
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@@ -3458,7 +3458,7 @@
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@@ -3524,7 +3524,7 @@
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@@ -3535,7 +3535,7 @@
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@@ -3609,7 +3609,7 @@
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@@ -3621,7 +3621,7 @@
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@@ -3642,7 +3642,7 @@
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@@ -3674,7 +3674,7 @@
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@@ -3691,7 +3691,7 @@
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@@ -3704,7 +3704,7 @@
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@@ -3717,7 +3717,7 @@
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@@ -3730,7 +3730,7 @@
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@@ -3744,7 +3744,7 @@
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@@ -3766,7 +3766,7 @@
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@@ -3781,7 +3781,7 @@
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@@ -3793,7 +3793,7 @@
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@@ -3806,7 +3806,7 @@
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@@ -3820,7 +3820,7 @@
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@@ -3831,7 +3831,7 @@
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@@ -3856,7 +3856,7 @@
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@@ -3872,7 +3872,7 @@
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@@ -3893,7 +3893,7 @@
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@@ -3913,7 +3913,7 @@
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@@ -3932,7 +3932,7 @@
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@@ -3967,7 +3967,7 @@
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@@ -3980,7 +3980,7 @@
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@@ -4057,7 +4057,7 @@
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@@ -4072,7 +4072,7 @@
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@@ -4087,7 +4087,7 @@
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@@ -4099,7 +4099,7 @@
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@@ -4117,7 +4117,7 @@
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@@ -4136,7 +4136,7 @@
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@@ -4148,7 +4148,7 @@
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@@ -4158,7 +4158,7 @@
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@@ -4174,7 +4174,7 @@
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@@ -4186,7 +4186,7 @@
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@@ -4196,7 +4196,7 @@
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@@ -4208,7 +4208,7 @@
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@@ -4218,7 +4218,7 @@
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@@ -4230,7 +4230,7 @@
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@@ -4246,7 +4246,7 @@
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@@ -4258,7 +4258,7 @@
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@@ -4291,7 +4291,7 @@
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@@ -4303,7 +4303,7 @@
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@@ -4321,7 +4321,7 @@
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@@ -4331,7 +4331,7 @@
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@@ -4362,7 +4362,7 @@
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@@ -4377,7 +4377,7 @@
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@@ -4395,7 +4395,7 @@
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@@ -4407,7 +4407,7 @@
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@@ -4419,7 +4419,7 @@
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@@ -4437,7 +4437,7 @@
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@@ -4466,7 +4466,7 @@
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@@ -4484,7 +4484,7 @@
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@@ -4496,7 +4496,7 @@
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@@ -4508,7 +4508,7 @@
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@@ -4520,7 +4520,7 @@
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@@ -4532,7 +4532,7 @@
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@@ -4544,7 +4544,7 @@
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@@ -4561,7 +4561,7 @@
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@@ -4580,7 +4580,7 @@
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@@ -4592,7 +4592,7 @@
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@@ -4606,7 +4606,7 @@
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@@ -4626,7 +4626,7 @@
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@@ -4664,7 +4664,7 @@
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@@ -4676,7 +4676,7 @@
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@@ -4686,7 +4686,7 @@
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@@ -4698,7 +4698,7 @@
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@@ -4709,7 +4709,7 @@
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@@ -4754,7 +4754,7 @@
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@@ -4771,7 +4771,7 @@
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@@ -4799,7 +4799,7 @@
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@@ -4814,7 +4814,7 @@
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@@ -4858,7 +4858,7 @@
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@@ -4868,7 +4868,7 @@
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@@ -4879,7 +4879,7 @@
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-   "id": "477e0c94",
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@@ -4907,7 +4907,7 @@
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@@ -4922,7 +4922,7 @@
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@@ -4933,7 +4933,7 @@
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-   "id": "4554a3c2",
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@@ -4961,7 +4961,7 @@
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@@ -4972,7 +4972,7 @@
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-   "id": "797ef368",
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@@ -4997,7 +4997,7 @@
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@@ -5008,7 +5008,7 @@
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-   "id": "941ce0fd",
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@@ -5044,7 +5044,7 @@
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-   "id": "d4982be9",
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@@ -5064,7 +5064,7 @@
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@@ -5075,7 +5075,7 @@
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-   "id": "550977a1",
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@@ -5113,7 +5113,7 @@
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@@ -5123,7 +5123,7 @@
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@@ -5137,7 +5137,7 @@
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@@ -5159,7 +5159,7 @@
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@@ -5169,7 +5169,7 @@
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@@ -5180,7 +5180,7 @@
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-   "id": "9a93fb89",
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@@ -5202,7 +5202,7 @@
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@@ -5215,7 +5215,7 @@
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@@ -5240,7 +5240,7 @@
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@@ -5252,7 +5252,7 @@
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@@ -5267,7 +5267,7 @@
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@@ -5282,7 +5282,7 @@
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-   "id": "d8fef0f2",
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@@ -5342,7 +5342,7 @@
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@@ -5353,7 +5353,7 @@
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-   "id": "bd8d0bc3",
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@@ -5417,7 +5417,7 @@
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@@ -5428,7 +5428,7 @@
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@@ -5477,7 +5477,7 @@
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@@ -5489,7 +5489,7 @@
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@@ -5573,7 +5573,7 @@
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@@ -5584,7 +5584,7 @@
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@@ -5662,7 +5662,7 @@
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@@ -5673,7 +5673,7 @@
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@@ -5732,7 +5732,7 @@
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@@ -5742,7 +5742,7 @@
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@@ -5753,7 +5753,7 @@
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@@ -5818,7 +5818,7 @@
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@@ -5829,7 +5829,7 @@
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@@ -5899,7 +5899,7 @@
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@@ -5910,7 +5910,7 @@
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@@ -5954,7 +5954,7 @@
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@@ -5973,7 +5973,7 @@
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diff --git a/doc/pub/day4/ipynb/ipynb-Day4-src.tar.gz b/doc/pub/day4/ipynb/ipynb-Day4-src.tar.gz
index 431c509..460276f 100644
Binary files a/doc/pub/day4/ipynb/ipynb-Day4-src.tar.gz and b/doc/pub/day4/ipynb/ipynb-Day4-src.tar.gz differ
diff --git a/doc/pub/day4/pdf/day4.pdf b/doc/pub/day4/pdf/day4.pdf
index 94e9d83..ee73ea1 100644
Binary files a/doc/pub/day4/pdf/day4.pdf and b/doc/pub/day4/pdf/day4.pdf differ
diff --git a/doc/src/Day4/Day4.do.txt b/doc/src/Day4/Day4.do.txt
index 90387c9..75841c5 100644
--- a/doc/src/Day4/Day4.do.txt
+++ b/doc/src/Day4/Day4.do.txt
@@ -1,6 +1,6 @@
 TITLE: Data Analysis and Machine Learning: Logistic Regression and Gradient Methods
 AUTHOR: Morten Hjorth-Jensen {copyright, 1999-present|CC BY-NC} at Department of Physics and Center for Computing in Science Education, University of Oslo, Norway & Department of Physics and Astronomy and Facility for Rare Ion Beams and National Superconducting Cyclotron Laboratory, Michigan State University, USA
-DATE: November 7 and 14, 2022
+DATE: November 6, 12 and 13, 2023