diff --git a/doc/pub/week39/html/week39-bs.html b/doc/pub/week39/html/week39-bs.html
index 9981773ad..e57267e6f 100644
--- a/doc/pub/week39/html/week39-bs.html
+++ b/doc/pub/week39/html/week39-bs.html
@@ -242,7 +242,6 @@ doconce format html week39.do.txt --html_style=bootstrap --pygments_html_style=d
                2,
                None,
                'the-syntax-a-dot-b-when-finding-the-dot-product'),
-              ('Recommended to avoid', 2, None, 'recommended-to-avoid'),
               ('Using Autograd with OLS', 2, None, 'using-autograd-with-ols'),
               ('Same code but now with momentum gradient descent',
                2,
@@ -359,7 +358,7 @@ MathJax.Hub.Config({
      <!-- navigation toc: --> <li><a href="._week39-bs044.html#program-example-for-gradient-descent-with-ridge-regression" style="font-size: 80%;">Program example for gradient descent with Ridge Regression</a></li>
      <!-- navigation toc: --> <li><a href="._week39-bs045.html#using-gradient-descent-methods-limitations" style="font-size: 80%;">Using gradient descent methods, limitations</a></li>
      <!-- navigation toc: --> <li><a href="._week39-bs046.html#improving-gradient-descent-with-momentum" style="font-size: 80%;">Improving gradient descent with momentum</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs084.html#same-code-but-now-with-momentum-gradient-descent" style="font-size: 80%;">Same code but now with momentum gradient descent</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs083.html#same-code-but-now-with-momentum-gradient-descent" style="font-size: 80%;">Same code but now with momentum gradient descent</a></li>
      <!-- navigation toc: --> <li><a href="._week39-bs048.html#overview-video-on-stochastic-gradient-descent" style="font-size: 80%;">Overview video on Stochastic Gradient Descent</a></li>
      <!-- navigation toc: --> <li><a href="._week39-bs049.html#batches-and-mini-batches" style="font-size: 80%;">Batches and mini-batches</a></li>
      <!-- navigation toc: --> <li><a href="._week39-bs050.html#stochastic-gradient-descent-sgd" style="font-size: 80%;">Stochastic Gradient Descent (SGD)</a></li>
@@ -391,17 +390,16 @@ MathJax.Hub.Config({
      <!-- navigation toc: --> <li><a href="._week39-bs076.html#using-recursion" style="font-size: 80%;">Using recursion</a></li>
      <!-- navigation toc: --> <li><a href="._week39-bs077.html#unsupported-functions" style="font-size: 80%;">Unsupported functions</a></li>
      <!-- navigation toc: --> <li><a href="._week39-bs078.html#the-syntax-a-dot-b-when-finding-the-dot-product" style="font-size: 80%;">The syntax a.dot(b) when finding the dot product</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs079.html#recommended-to-avoid" style="font-size: 80%;">Recommended to avoid</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs080.html#using-autograd-with-ols" style="font-size: 80%;">Using Autograd with OLS</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs084.html#same-code-but-now-with-momentum-gradient-descent" style="font-size: 80%;">Same code but now with momentum gradient descent</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs082.html#but-none-of-these-can-compete-with-newton-s-method" style="font-size: 80%;">But none of these can compete with Newton's method</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs083.html#including-stochastic-gradient-descent-with-autograd" style="font-size: 80%;">Including Stochastic Gradient Descent with Autograd</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs084.html#same-code-but-now-with-momentum-gradient-descent" style="font-size: 80%;">Same code but now with momentum gradient descent</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs085.html#similar-second-order-function-now-problem-but-now-with-adagrad" style="font-size: 80%;">Similar (second order function now) problem but now with AdaGrad</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs086.html#rmsprop-for-adaptive-learning-rate-with-stochastic-gradient-descent" style="font-size: 80%;">RMSprop for adaptive learning rate with Stochastic Gradient Descent</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs087.html#and-finally-adam-https-arxiv-org-pdf-1412-6980-pdf" style="font-size: 80%;">And finally "ADAM":"https://arxiv.org/pdf/1412.6980.pdf"</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs088.html#and-logistic-regression" style="font-size: 80%;">And Logistic Regression</a></li>
-     <!-- navigation toc: --> <li><a href="._week39-bs089.html#introducing-jax-https-jax-readthedocs-io-en-latest" style="font-size: 80%;">Introducing "JAX":"https://jax.readthedocs.io/en/latest/"</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs079.html#using-autograd-with-ols" style="font-size: 80%;">Using Autograd with OLS</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs083.html#same-code-but-now-with-momentum-gradient-descent" style="font-size: 80%;">Same code but now with momentum gradient descent</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs081.html#but-none-of-these-can-compete-with-newton-s-method" style="font-size: 80%;">But none of these can compete with Newton's method</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs082.html#including-stochastic-gradient-descent-with-autograd" style="font-size: 80%;">Including Stochastic Gradient Descent with Autograd</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs083.html#same-code-but-now-with-momentum-gradient-descent" style="font-size: 80%;">Same code but now with momentum gradient descent</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs084.html#similar-second-order-function-now-problem-but-now-with-adagrad" style="font-size: 80%;">Similar (second order function now) problem but now with AdaGrad</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs085.html#rmsprop-for-adaptive-learning-rate-with-stochastic-gradient-descent" style="font-size: 80%;">RMSprop for adaptive learning rate with Stochastic Gradient Descent</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs086.html#and-finally-adam-https-arxiv-org-pdf-1412-6980-pdf" style="font-size: 80%;">And finally "ADAM":"https://arxiv.org/pdf/1412.6980.pdf"</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs087.html#and-logistic-regression" style="font-size: 80%;">And Logistic Regression</a></li>
+     <!-- navigation toc: --> <li><a href="._week39-bs088.html#introducing-jax-https-jax-readthedocs-io-en-latest" style="font-size: 80%;">Introducing "JAX":"https://jax.readthedocs.io/en/latest/"</a></li>
 
         </ul>
       </li>
@@ -456,7 +454,7 @@ MathJax.Hub.Config({
   <li><a href="._week39-bs008.html">9</a></li>
   <li><a href="._week39-bs009.html">10</a></li>
   <li><a href="">...</a></li>
-  <li><a href="._week39-bs089.html">90</a></li>
+  <li><a href="._week39-bs088.html">89</a></li>
   <li><a href="._week39-bs001.html">&raquo;</a></li>
 </ul>
 <!-- ------------------- end of main content --------------- -->
diff --git a/doc/pub/week39/html/week39-reveal.html b/doc/pub/week39/html/week39-reveal.html
index bc484770c..88b9db0f9 100644
--- a/doc/pub/week39/html/week39-reveal.html
+++ b/doc/pub/week39/html/week39-reveal.html
@@ -3106,36 +3106,6 @@ x = np.array([<span style="color: #B452CD">3.0</span>,<span style="color: #B452C
 </div>
 </section>
 
-<section>
-<h2 id="recommended-to-avoid">Recommended to avoid </h2>
-<p>The documentation recommends to avoid inplace operations such as</p>
-
-<!-- code=python (!bc pycod) typeset with pygments style "perldoc" -->
-<div class="cell border-box-sizing code_cell rendered">
-  <div class="input">
-    <div class="inner_cell">
-      <div class="input_area">
-        <div class="highlight" style="background: #eeeedd">
-  <pre style="font-size: 80%; line-height: 125%;">a += b
-a -= b
-a*= b
-a /=b
-</pre>
-</div>
-      </div>
-    </div>
-  </div>
-  <div class="output_wrapper">
-    <div class="output">
-      <div class="output_area">
-        <div class="output_subarea output_stream output_stdout output_text">          
-        </div>
-      </div>
-    </div>
-  </div>
-</div>
-</section>
-
 <section>
 <h2 id="using-autograd-with-ols">Using Autograd with OLS </h2>
 
diff --git a/doc/pub/week39/html/week39-solarized.html b/doc/pub/week39/html/week39-solarized.html
index 121eb1b65..d553b3e72 100644
--- a/doc/pub/week39/html/week39-solarized.html
+++ b/doc/pub/week39/html/week39-solarized.html
@@ -269,7 +269,6 @@ div.toc p,a {
                2,
                None,
                'the-syntax-a-dot-b-when-finding-the-dot-product'),
-              ('Recommended to avoid', 2, None, 'recommended-to-avoid'),
               ('Using Autograd with OLS', 2, None, 'using-autograd-with-ols'),
               ('Same code but now with momentum gradient descent',
                2,
@@ -3044,36 +3043,6 @@ x = np.array([<span style="color: #B452CD">3.0</span>,<span style="color: #B452C
 </div>
 
 
-<!-- !split --><br><br><br><br><br><br><br><br><br><br>
-<h2 id="recommended-to-avoid">Recommended to avoid </h2>
-<p>The documentation recommends to avoid inplace operations such as</p>
-
-<!-- code=python (!bc pycod) typeset with pygments style "perldoc" -->
-<div class="cell border-box-sizing code_cell rendered">
-  <div class="input">
-    <div class="inner_cell">
-      <div class="input_area">
-        <div class="highlight" style="background: #eeeedd">
-  <pre style="line-height: 125%;">a += b
-a -= b
-a*= b
-a /=b
-</pre>
-</div>
-      </div>
-    </div>
-  </div>
-  <div class="output_wrapper">
-    <div class="output">
-      <div class="output_area">
-        <div class="output_subarea output_stream output_stdout output_text">          
-        </div>
-      </div>
-    </div>
-  </div>
-</div>
-
-
 <!-- !split --><br><br><br><br><br><br><br><br><br><br>
 <h2 id="using-autograd-with-ols">Using Autograd with OLS </h2>
 
diff --git a/doc/pub/week39/html/week39.html b/doc/pub/week39/html/week39.html
index a829601d8..43852bafc 100644
--- a/doc/pub/week39/html/week39.html
+++ b/doc/pub/week39/html/week39.html
@@ -346,7 +346,6 @@ div.toc p,a {
                2,
                None,
                'the-syntax-a-dot-b-when-finding-the-dot-product'),
-              ('Recommended to avoid', 2, None, 'recommended-to-avoid'),
               ('Using Autograd with OLS', 2, None, 'using-autograd-with-ols'),
               ('Same code but now with momentum gradient descent',
                2,
@@ -3121,36 +3120,6 @@ x <span style="color: #666666">=</span> np<span style="color: #666666">.</span>a
 </div>
 
 
-<!-- !split --><br><br><br><br><br><br><br><br><br><br>
-<h2 id="recommended-to-avoid">Recommended to avoid </h2>
-<p>The documentation recommends to avoid inplace operations such as</p>
-
-<!-- code=python (!bc pycod) typeset with pygments style "default" -->
-<div class="cell border-box-sizing code_cell rendered">
-  <div class="input">
-    <div class="inner_cell">
-      <div class="input_area">
-        <div class="highlight" style="background: #f8f8f8">
-  <pre style="line-height: 125%;">a <span style="color: #666666">+=</span> b
-a <span style="color: #666666">-=</span> b
-a<span style="color: #666666">*=</span> b
-a <span style="color: #666666">/=</span>b
-</pre>
-</div>
-      </div>
-    </div>
-  </div>
-  <div class="output_wrapper">
-    <div class="output">
-      <div class="output_area">
-        <div class="output_subarea output_stream output_stdout output_text">          
-        </div>
-      </div>
-    </div>
-  </div>
-</div>
-
-
 <!-- !split --><br><br><br><br><br><br><br><br><br><br>
 <h2 id="using-autograd-with-ols">Using Autograd with OLS </h2>
 
diff --git a/doc/pub/week39/ipynb/ipynb-week39-src.tar.gz b/doc/pub/week39/ipynb/ipynb-week39-src.tar.gz
index 97d2e6938..39737c46d 100644
Binary files a/doc/pub/week39/ipynb/ipynb-week39-src.tar.gz and b/doc/pub/week39/ipynb/ipynb-week39-src.tar.gz differ
diff --git a/doc/pub/week39/ipynb/week39.ipynb b/doc/pub/week39/ipynb/week39.ipynb
index f0c833c7e..e19f189a4 100644
--- a/doc/pub/week39/ipynb/week39.ipynb
+++ b/doc/pub/week39/ipynb/week39.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "markdown",
-   "id": "0be56d20",
+   "id": "2254a68d",
    "metadata": {
     "editable": true
    },
@@ -14,7 +14,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "41352012",
+   "id": "31cedf5c",
    "metadata": {
     "editable": true
    },
@@ -27,7 +27,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "471d9b17",
+   "id": "923b4bde",
    "metadata": {
     "editable": true
    },
@@ -37,7 +37,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a3f843e5",
+   "id": "73724d06",
    "metadata": {
     "editable": true
    },
@@ -67,7 +67,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "b611ff2d",
+   "id": "4b19d8d6",
    "metadata": {
     "editable": true
    },
@@ -94,7 +94,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "126f7d60",
+   "id": "c99e4edf",
    "metadata": {
     "editable": true
    },
@@ -115,7 +115,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a2682f11",
+   "id": "e31c673b",
    "metadata": {
     "editable": true
    },
@@ -132,7 +132,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "d51c88b5",
+   "id": "ac43b608",
    "metadata": {
     "editable": true
    },
@@ -147,7 +147,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4a135362",
+   "id": "aabe79ec",
    "metadata": {
     "editable": true
    },
@@ -157,7 +157,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "26444396",
+   "id": "78804ec8",
    "metadata": {
     "editable": true
    },
@@ -173,7 +173,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9bc5702f",
+   "id": "7dbc40f0",
    "metadata": {
     "editable": true
    },
@@ -185,7 +185,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a857de8b",
+   "id": "cfb64d4a",
    "metadata": {
     "editable": true
    },
@@ -196,7 +196,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "dc870dc3",
+   "id": "18d5ecb5",
    "metadata": {
     "editable": true
    },
@@ -208,7 +208,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4001c458",
+   "id": "1af7b435",
    "metadata": {
     "editable": true
    },
@@ -218,7 +218,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4f3262b4",
+   "id": "81594f4d",
    "metadata": {
     "editable": true
    },
@@ -232,7 +232,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "0d94cee2",
+   "id": "5d03e20f",
    "metadata": {
     "editable": true
    },
@@ -244,7 +244,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "d92e7b5d",
+   "id": "e9ef26a5",
    "metadata": {
     "editable": true
    },
@@ -254,7 +254,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "076acdca",
+   "id": "d7830188",
    "metadata": {
     "editable": true
    },
@@ -266,7 +266,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "c37ab3fd",
+   "id": "d46a0f97",
    "metadata": {
     "editable": true
    },
@@ -278,7 +278,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4f771526",
+   "id": "cf9b07d2",
    "metadata": {
     "editable": true
    },
@@ -298,7 +298,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e13dad72",
+   "id": "4b0ccd27",
    "metadata": {
     "editable": true
    },
@@ -314,7 +314,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "aff57d4b",
+   "id": "38fad3c1",
    "metadata": {
     "editable": true
    },
@@ -330,7 +330,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "38304c1d",
+   "id": "956d8d8d",
    "metadata": {
     "editable": true
    },
@@ -341,7 +341,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8da576a0",
+   "id": "c04d5f5b",
    "metadata": {
     "editable": true
    },
@@ -353,7 +353,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "46d9c588",
+   "id": "6381557f",
    "metadata": {
     "editable": true
    },
@@ -363,7 +363,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "3a3ca58b",
+   "id": "b794a967",
    "metadata": {
     "editable": true
    },
@@ -375,7 +375,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "0c9c700f",
+   "id": "a585ccf0",
    "metadata": {
     "editable": true
    },
@@ -385,7 +385,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "b273b273",
+   "id": "fa670518",
    "metadata": {
     "editable": true
    },
@@ -397,7 +397,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "3e0a875b",
+   "id": "6ae1fe30",
    "metadata": {
     "editable": true
    },
@@ -419,7 +419,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "727cfd55",
+   "id": "d24b1dde",
    "metadata": {
     "editable": true
    },
@@ -432,7 +432,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f78349b5",
+   "id": "6d83d75f",
    "metadata": {
     "editable": true
    },
@@ -445,7 +445,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2ee16c9e",
+   "id": "fc197a3e",
    "metadata": {
     "editable": true
    },
@@ -455,7 +455,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f95fdb8b",
+   "id": "c9b845b1",
    "metadata": {
     "editable": true
    },
@@ -473,7 +473,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "3f039432",
+   "id": "e35d282a",
    "metadata": {
     "editable": true
    },
@@ -483,7 +483,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "dbd20795",
+   "id": "fa743fe6",
    "metadata": {
     "editable": true
    },
@@ -498,7 +498,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "98ba6676",
+   "id": "1c4a8103",
    "metadata": {
     "editable": true
    },
@@ -508,7 +508,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ad52dad5",
+   "id": "b502afca",
    "metadata": {
     "editable": true
    },
@@ -522,7 +522,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "cc09e475",
+   "id": "3ba44616",
    "metadata": {
     "editable": true
    },
@@ -532,7 +532,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "7a1c0547",
+   "id": "cb9490f1",
    "metadata": {
     "editable": true
    },
@@ -546,7 +546,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9fe4208b",
+   "id": "a0db4fd4",
    "metadata": {
     "editable": true
    },
@@ -561,7 +561,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2a81e02b",
+   "id": "4f1f9355",
    "metadata": {
     "editable": true
    },
@@ -578,7 +578,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f90232dd",
+   "id": "13978c16",
    "metadata": {
     "editable": true
    },
@@ -590,7 +590,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4fb8b51e",
+   "id": "a016b4b5",
    "metadata": {
     "editable": true
    },
@@ -604,7 +604,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "81da0301",
+   "id": "b3d6e411",
    "metadata": {
     "editable": true
    },
@@ -619,7 +619,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9b1a0014",
+   "id": "dca89a3a",
    "metadata": {
     "editable": true
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@@ -631,7 +631,7 @@
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@@ -642,7 +642,7 @@
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@@ -670,7 +670,7 @@
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@@ -692,7 +692,7 @@
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@@ -714,7 +714,7 @@
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@@ -735,7 +735,7 @@
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@@ -774,7 +774,7 @@
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@@ -802,7 +802,7 @@
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@@ -832,7 +832,7 @@
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@@ -852,7 +852,7 @@
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@@ -864,7 +864,7 @@
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@@ -874,7 +874,7 @@
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@@ -886,7 +886,7 @@
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@@ -898,7 +898,7 @@
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@@ -910,7 +910,7 @@
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@@ -922,7 +922,7 @@
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@@ -933,7 +933,7 @@
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@@ -946,7 +946,7 @@
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@@ -958,7 +958,7 @@
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@@ -968,7 +968,7 @@
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@@ -980,7 +980,7 @@
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@@ -990,7 +990,7 @@
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@@ -1001,7 +1001,7 @@
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@@ -1013,7 +1013,7 @@
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@@ -1025,7 +1025,7 @@
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@@ -1037,7 +1037,7 @@
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@@ -1048,7 +1048,7 @@
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@@ -1059,7 +1059,7 @@
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@@ -1071,7 +1071,7 @@
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@@ -1081,7 +1081,7 @@
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@@ -1093,7 +1093,7 @@
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@@ -1103,7 +1103,7 @@
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@@ -1115,7 +1115,7 @@
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@@ -1125,7 +1125,7 @@
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@@ -1137,7 +1137,7 @@
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@@ -1147,7 +1147,7 @@
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@@ -1159,7 +1159,7 @@
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@@ -1170,7 +1170,7 @@
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@@ -1203,7 +1203,7 @@
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@@ -1214,7 +1214,7 @@
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@@ -1228,7 +1228,7 @@
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@@ -1239,7 +1239,7 @@
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@@ -1252,7 +1252,7 @@
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@@ -1263,7 +1263,7 @@
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@@ -1281,7 +1281,7 @@
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@@ -1292,7 +1292,7 @@
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@@ -1307,7 +1307,7 @@
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@@ -1317,7 +1317,7 @@
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@@ -1331,7 +1331,7 @@
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@@ -1343,7 +1343,7 @@
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@@ -1354,7 +1354,7 @@
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@@ -1366,7 +1366,7 @@
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@@ -1377,7 +1377,7 @@
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@@ -1388,7 +1388,7 @@
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@@ -1400,7 +1400,7 @@
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@@ -1410,7 +1410,7 @@
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@@ -1422,7 +1422,7 @@
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@@ -1434,7 +1434,7 @@
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@@ -1446,7 +1446,7 @@
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@@ -1458,7 +1458,7 @@
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@@ -1469,7 +1469,7 @@
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@@ -1481,7 +1481,7 @@
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@@ -1491,7 +1491,7 @@
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@@ -1503,7 +1503,7 @@
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@@ -1513,7 +1513,7 @@
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@@ -1525,7 +1525,7 @@
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@@ -1545,7 +1545,7 @@
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@@ -1557,7 +1557,7 @@
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@@ -1567,7 +1567,7 @@
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@@ -1579,7 +1579,7 @@
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@@ -1589,7 +1589,7 @@
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@@ -1600,7 +1600,7 @@
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@@ -1612,7 +1612,7 @@
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@@ -1624,7 +1624,7 @@
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@@ -1636,7 +1636,7 @@
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@@ -1649,7 +1649,7 @@
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@@ -1660,7 +1660,7 @@
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@@ -1672,7 +1672,7 @@
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@@ -1688,7 +1688,7 @@
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@@ -1700,7 +1700,7 @@
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@@ -1711,7 +1711,7 @@
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@@ -1723,7 +1723,7 @@
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@@ -1733,7 +1733,7 @@
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@@ -1745,7 +1745,7 @@
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@@ -1755,7 +1755,7 @@
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@@ -1767,7 +1767,7 @@
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@@ -1777,7 +1777,7 @@
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@@ -1789,7 +1789,7 @@
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@@ -1813,7 +1813,7 @@
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@@ -1827,7 +1827,7 @@
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@@ -1838,7 +1838,7 @@
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@@ -1850,7 +1850,7 @@
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@@ -1860,7 +1860,7 @@
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@@ -1872,7 +1872,7 @@
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@@ -1886,7 +1886,7 @@
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@@ -1902,7 +1902,7 @@
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@@ -1912,7 +1912,7 @@
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@@ -1924,7 +1924,7 @@
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@@ -1934,7 +1934,7 @@
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@@ -1946,7 +1946,7 @@
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@@ -1960,7 +1960,7 @@
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@@ -1970,7 +1970,7 @@
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@@ -1981,7 +1981,7 @@
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@@ -1996,7 +1996,7 @@
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@@ -2006,7 +2006,7 @@
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@@ -2018,7 +2018,7 @@
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@@ -2030,7 +2030,7 @@
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@@ -2045,7 +2045,7 @@
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@@ -2058,7 +2058,7 @@
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@@ -2115,7 +2115,7 @@
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@@ -2126,7 +2126,7 @@
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@@ -2153,7 +2153,7 @@
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@@ -2165,7 +2165,7 @@
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@@ -2177,7 +2177,7 @@
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@@ -2187,7 +2187,7 @@
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@@ -2201,7 +2201,7 @@
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@@ -2211,7 +2211,7 @@
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@@ -2223,7 +2223,7 @@
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@@ -2234,7 +2234,7 @@
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@@ -2249,7 +2249,7 @@
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@@ -2263,7 +2263,7 @@
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@@ -2274,7 +2274,7 @@
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@@ -2335,7 +2335,7 @@
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@@ -2357,7 +2357,7 @@
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@@ -2370,7 +2370,7 @@
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@@ -2436,7 +2436,7 @@
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@@ -2447,7 +2447,7 @@
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@@ -2521,7 +2521,7 @@
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@@ -2533,7 +2533,7 @@
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@@ -2554,7 +2554,7 @@
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@@ -2586,7 +2586,7 @@
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@@ -2603,7 +2603,7 @@
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@@ -2616,7 +2616,7 @@
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@@ -2629,7 +2629,7 @@
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@@ -2642,7 +2642,7 @@
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@@ -2656,7 +2656,7 @@
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@@ -2678,7 +2678,7 @@
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@@ -2693,7 +2693,7 @@
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@@ -2705,7 +2705,7 @@
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@@ -2718,7 +2718,7 @@
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@@ -2732,7 +2732,7 @@
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@@ -2743,7 +2743,7 @@
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@@ -2768,7 +2768,7 @@
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@@ -2784,7 +2784,7 @@
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@@ -2805,7 +2805,7 @@
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@@ -2825,7 +2825,7 @@
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@@ -2844,7 +2844,7 @@
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@@ -2879,7 +2879,7 @@
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@@ -2892,7 +2892,7 @@
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@@ -2969,7 +2969,7 @@
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@@ -2984,7 +2984,7 @@
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@@ -2999,7 +2999,7 @@
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@@ -3011,7 +3011,7 @@
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@@ -3029,7 +3029,7 @@
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@@ -3048,7 +3048,7 @@
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@@ -3060,7 +3060,7 @@
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@@ -3070,7 +3070,7 @@
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@@ -3086,7 +3086,7 @@
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@@ -3098,7 +3098,7 @@
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@@ -3108,7 +3108,7 @@
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@@ -3120,7 +3120,7 @@
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@@ -3130,7 +3130,7 @@
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@@ -3142,7 +3142,7 @@
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@@ -3158,7 +3158,7 @@
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@@ -3170,7 +3170,7 @@
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@@ -3203,7 +3203,7 @@
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@@ -3215,7 +3215,7 @@
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@@ -3233,7 +3233,7 @@
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@@ -3243,7 +3243,7 @@
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@@ -3274,7 +3274,7 @@
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@@ -3289,7 +3289,7 @@
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@@ -3307,7 +3307,7 @@
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@@ -3319,7 +3319,7 @@
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@@ -3331,7 +3331,7 @@
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@@ -3349,7 +3349,7 @@
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@@ -3378,7 +3378,7 @@
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@@ -3396,7 +3396,7 @@
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@@ -3408,7 +3408,7 @@
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@@ -3420,7 +3420,7 @@
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@@ -3432,7 +3432,7 @@
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@@ -3444,7 +3444,7 @@
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@@ -3456,7 +3456,7 @@
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@@ -3473,7 +3473,7 @@
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@@ -3492,7 +3492,7 @@
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@@ -3504,7 +3504,7 @@
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@@ -3518,7 +3518,7 @@
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@@ -3538,7 +3538,7 @@
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@@ -3576,7 +3576,7 @@
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@@ -3588,7 +3588,7 @@
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@@ -3598,7 +3598,7 @@
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@@ -3610,7 +3610,7 @@
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@@ -3621,7 +3621,7 @@
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@@ -3666,7 +3666,7 @@
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@@ -3683,7 +3683,7 @@
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@@ -3711,7 +3711,7 @@
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@@ -3726,7 +3726,7 @@
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@@ -3770,7 +3770,7 @@
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@@ -3780,7 +3780,7 @@
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@@ -3791,7 +3791,7 @@
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@@ -3819,7 +3819,7 @@
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@@ -3834,7 +3834,7 @@
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@@ -3845,7 +3845,7 @@
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     "collapsed": false,
     "editable": true
@@ -3873,7 +3873,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2d3597e1",
+   "id": "dbc2f6c3",
    "metadata": {
     "editable": true
    },
@@ -3884,7 +3884,7 @@
   {
    "cell_type": "code",
    "execution_count": 20,
-   "id": "a694b773",
+   "id": "5c842a06",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -3909,7 +3909,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "63681987",
+   "id": "844e01b1",
    "metadata": {
     "editable": true
    },
@@ -3920,7 +3920,7 @@
   {
    "cell_type": "code",
    "execution_count": 21,
-   "id": "ae061106",
+   "id": "85d188e2",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -3956,7 +3956,7 @@
   {
    "cell_type": "code",
    "execution_count": 22,
-   "id": "a194eddc",
+   "id": "b0afa960",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -3976,7 +3976,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8c21cf38",
+   "id": "581e341f",
    "metadata": {
     "editable": true
    },
@@ -3987,7 +3987,7 @@
   {
    "cell_type": "code",
    "execution_count": 23,
-   "id": "3eb55bad",
+   "id": "d4c349a5",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4025,7 +4025,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "12fbb13b",
+   "id": "d4ae05a6",
    "metadata": {
     "editable": true
    },
@@ -4035,7 +4035,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "19ed9d51",
+   "id": "13ef97cc",
    "metadata": {
     "editable": true
    },
@@ -4049,7 +4049,7 @@
   {
    "cell_type": "code",
    "execution_count": 24,
-   "id": "fb297a92",
+   "id": "5e7a3e34",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4071,7 +4071,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "06d0bc95",
+   "id": "a70af861",
    "metadata": {
     "editable": true
    },
@@ -4081,7 +4081,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9974f300",
+   "id": "846d050e",
    "metadata": {
     "editable": true
    },
@@ -4092,7 +4092,7 @@
   {
    "cell_type": "code",
    "execution_count": 25,
-   "id": "cbb0a202",
+   "id": "a69564a2",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4114,7 +4114,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "7f08b96c",
+   "id": "453994b2",
    "metadata": {
     "editable": true
    },
@@ -4127,7 +4127,7 @@
   {
    "cell_type": "code",
    "execution_count": 26,
-   "id": "cba444cd",
+   "id": "a6462c1e",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4152,34 +4152,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "18e2b174",
-   "metadata": {
-    "editable": true
-   },
-   "source": [
-    "## Recommended to avoid\n",
-    "The documentation recommends to avoid inplace operations such as"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 27,
-   "id": "69c6914d",
-   "metadata": {
-    "collapsed": false,
-    "editable": true
-   },
-   "outputs": [],
-   "source": [
-    "a += b\n",
-    "a -= b\n",
-    "a*= b\n",
-    "a /=b"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "600cc052",
+   "id": "b2b3574e",
    "metadata": {
     "editable": true
    },
@@ -4193,8 +4166,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
-   "id": "cd18340b",
+   "execution_count": 27,
+   "id": "f5ac02a2",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4254,7 +4227,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "849de571",
+   "id": "31c54ed4",
    "metadata": {
     "editable": true
    },
@@ -4264,8 +4237,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 29,
-   "id": "ac458170",
+   "execution_count": 28,
+   "id": "e24d96d9",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4329,7 +4302,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f33ed0dd",
+   "id": "416d20eb",
    "metadata": {
     "editable": true
    },
@@ -4339,8 +4312,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 30,
-   "id": "e6b06cdb",
+   "execution_count": 29,
+   "id": "9d60ac01",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4389,7 +4362,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "90de8a04",
+   "id": "de82bfbc",
    "metadata": {
     "editable": true
    },
@@ -4400,8 +4373,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 31,
-   "id": "a010a209",
+   "execution_count": 30,
+   "id": "877c2b05",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4485,7 +4458,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "18298e5e",
+   "id": "b73c6697",
    "metadata": {
     "editable": true
    },
@@ -4495,8 +4468,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 32,
-   "id": "3320d6c6",
+   "execution_count": 31,
+   "id": "7f00a2d7",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4574,7 +4547,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f1411612",
+   "id": "2102c235",
    "metadata": {
     "editable": true
    },
@@ -4584,8 +4557,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 33,
-   "id": "19414323",
+   "execution_count": 32,
+   "id": "5f75ec0f",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4644,7 +4617,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a77cdfa4",
+   "id": "5c66075e",
    "metadata": {
     "editable": true
    },
@@ -4654,7 +4627,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9f488085",
+   "id": "a95c1509",
    "metadata": {
     "editable": true
    },
@@ -4664,8 +4637,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 34,
-   "id": "6724b3d2",
+   "execution_count": 33,
+   "id": "527efcff",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4730,7 +4703,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "09728e4a",
+   "id": "d771fa2d",
    "metadata": {
     "editable": true
    },
@@ -4740,8 +4713,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 35,
-   "id": "28aa6aad",
+   "execution_count": 34,
+   "id": "e778dd2b",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4811,7 +4784,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "70fc8bdd",
+   "id": "79899022",
    "metadata": {
     "editable": true
    },
@@ -4821,8 +4794,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 36,
-   "id": "f3dde7c5",
+   "execution_count": 35,
+   "id": "6285f635",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -4866,7 +4839,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "b46c449b",
+   "id": "23027ae4",
    "metadata": {
     "editable": true
    },
@@ -4884,8 +4857,8 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 37,
-   "id": "291c9b6d",
+   "execution_count": 36,
+   "id": "a2f5be06",
    "metadata": {
     "collapsed": false,
     "editable": true
diff --git a/doc/src/week39/week39.do.txt b/doc/src/week39/week39.do.txt
index 65e81c3cd..c89fd9195 100644
--- a/doc/src/week39/week39.do.txt
+++ b/doc/src/week39/week39.do.txt
@@ -2141,16 +2141,6 @@ print("The gradient of f9 is:",f9_alternative_grad(x))
 # w.r.t x is (b_1, b_2).
 !ec
 
-!split
-===== Recommended to avoid =====
-The documentation recommends to avoid inplace operations such as
-!bc pycod
-a += b
-a -= b
-a*= b
-a /=b
-!ec
-
 
 !split
 =====  Using Autograd with OLS =====