From 4db982a6985ccfa5b38204633e46d31f074b2269 Mon Sep 17 00:00:00 2001
From: Morten Hjorth-Jensen <morten.hjorth-jensen@fys.uio.no>
Date: Wed, 3 Nov 2021 08:00:38 +0100
Subject: [PATCH] update of typos

---
 doc/pub/week39/html/week39-reveal.html       |   6 +-
 doc/pub/week39/html/week39-solarized.html    |   6 +-
 doc/pub/week39/html/week39.html              |   6 +-
 doc/pub/week39/ipynb/ipynb-week39-src.tar.gz | Bin 193 -> 192 bytes
 doc/pub/week39/ipynb/week39.ipynb            | 402 ++++++++---------
 doc/pub/week40/html/._week40-bs012.html      |   6 +-
 doc/pub/week40/html/week40-reveal.html       |   6 +-
 doc/pub/week40/html/week40-solarized.html    |   6 +-
 doc/pub/week40/html/week40.html              |   6 +-
 doc/pub/week40/ipynb/ipynb-week40-src.tar.gz | Bin 34326 -> 34326 bytes
 doc/pub/week40/ipynb/week40.ipynb            | 426 +++++++++----------
 doc/src/week39/week39.do.txt                 |   6 +-
 doc/src/week40/week40.do.txt                 |   6 +-
 13 files changed, 441 insertions(+), 441 deletions(-)

diff --git a/doc/pub/week39/html/week39-reveal.html b/doc/pub/week39/html/week39-reveal.html
index 7271e8515..3bc363cd9 100644
--- a/doc/pub/week39/html/week39-reveal.html
+++ b/doc/pub/week39/html/week39-reveal.html
@@ -2246,9 +2246,9 @@ theta = np.random.randn(2,1)
 for epoch in range(n_epochs):
 # Can you figure out a better way of setting up the contributions to each batch?
     for i in range(m):
-        random_index = np.random.randint(m)
-        xi = X[random_index*M:random_index*M+M]
-        yi = y[random_index*M:random_index*M+M]
+        random_index = M*np.random.randint(m)
+        xi = X[random_index:random_index+M]
+        yi = y[random_index:random_index+M]
         gradients = (2.0/M)* xi.T @ ((xi @ theta)-yi)
         eta = learning_schedule(epoch*m+i)
         theta = theta - eta*gradients
diff --git a/doc/pub/week39/html/week39-solarized.html b/doc/pub/week39/html/week39-solarized.html
index 4ad4e500f..db67d2a6f 100644
--- a/doc/pub/week39/html/week39-solarized.html
+++ b/doc/pub/week39/html/week39-solarized.html
@@ -2133,9 +2133,9 @@ theta = np.random.randn(2,1)
 for epoch in range(n_epochs):
 # Can you figure out a better way of setting up the contributions to each batch?
     for i in range(m):
-        random_index = np.random.randint(m)
-        xi = X[random_index*M:random_index*M+M]
-        yi = y[random_index*M:random_index*M+M]
+        random_index = M*np.random.randint(m)
+        xi = X[random_index:random_index+M]
+        yi = y[random_index:random_index+M]
         gradients = (2.0/M)* xi.T @ ((xi @ theta)-yi)
         eta = learning_schedule(epoch*m+i)
         theta = theta - eta*gradients
diff --git a/doc/pub/week39/html/week39.html b/doc/pub/week39/html/week39.html
index 82bb8a138..7464180a5 100644
--- a/doc/pub/week39/html/week39.html
+++ b/doc/pub/week39/html/week39.html
@@ -2210,9 +2210,9 @@ theta = np.random.randn(2,1)
 for epoch in range(n_epochs):
 # Can you figure out a better way of setting up the contributions to each batch?
     for i in range(m):
-        random_index = np.random.randint(m)
-        xi = X[random_index*M:random_index*M+M]
-        yi = y[random_index*M:random_index*M+M]
+        random_index = M*np.random.randint(m)
+        xi = X[random_index:random_index+M]
+        yi = y[random_index:random_index+M]
         gradients = (2.0/M)* xi.T @ ((xi @ theta)-yi)
         eta = learning_schedule(epoch*m+i)
         theta = theta - eta*gradients
diff --git a/doc/pub/week39/ipynb/ipynb-week39-src.tar.gz b/doc/pub/week39/ipynb/ipynb-week39-src.tar.gz
index 3e20937d1a423c574899f2748602524746b72f66..d511de4b10fe0ff4a1760adf966602354dbdcf19 100644
GIT binary patch
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diff --git a/doc/pub/week39/ipynb/week39.ipynb b/doc/pub/week39/ipynb/week39.ipynb
index 065b14e68..db87fd4ba 100644
--- a/doc/pub/week39/ipynb/week39.ipynb
+++ b/doc/pub/week39/ipynb/week39.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "markdown",
-   "id": "f128077b",
+   "id": "c4da4e52",
    "metadata": {
     "editable": true
    },
@@ -14,7 +14,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "88eb0662",
+   "id": "f29028c4",
    "metadata": {
     "editable": true
    },
@@ -29,7 +29,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ef4b2c9f",
+   "id": "7f7ee367",
    "metadata": {
     "editable": true
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@@ -55,7 +55,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ea15a627",
+   "id": "fc2a836f",
    "metadata": {
     "editable": true
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@@ -67,7 +67,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8f497e37",
+   "id": "9617382d",
    "metadata": {
     "editable": true
    },
@@ -86,7 +86,7 @@
   {
    "cell_type": "code",
    "execution_count": 1,
-   "id": "1f28007d",
+   "id": "d49166c2",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -143,7 +143,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "53dcc56a",
+   "id": "19a9a5ab",
    "metadata": {
     "editable": true
    },
@@ -155,7 +155,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1c24f55e",
+   "id": "edeb088d",
    "metadata": {
     "editable": true
    },
@@ -170,7 +170,7 @@
   {
    "cell_type": "code",
    "execution_count": 2,
-   "id": "826e8ebc",
+   "id": "71bdc0a2",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -223,7 +223,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "575ec2af",
+   "id": "0ff3515b",
    "metadata": {
     "editable": true
    },
@@ -238,7 +238,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f1d41e62",
+   "id": "fb36d7f9",
    "metadata": {
     "editable": true
    },
@@ -258,7 +258,7 @@
   {
    "cell_type": "code",
    "execution_count": 3,
-   "id": "0f87e8b0",
+   "id": "0dc5c1a6",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -312,7 +312,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1501c5b4",
+   "id": "c0482352",
    "metadata": {
     "editable": true
    },
@@ -331,7 +331,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "5a2e32c5",
+   "id": "f13f9cf3",
    "metadata": {
     "editable": true
    },
@@ -348,7 +348,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e1a1d1e6",
+   "id": "563d2108",
    "metadata": {
     "editable": true
    },
@@ -363,7 +363,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "5311a844",
+   "id": "cfebfdde",
    "metadata": {
     "editable": true
    },
@@ -373,7 +373,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "415a12aa",
+   "id": "f732663f",
    "metadata": {
     "editable": true
    },
@@ -389,7 +389,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e9cb4b5b",
+   "id": "a4f74c15",
    "metadata": {
     "editable": true
    },
@@ -401,7 +401,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "cae474f3",
+   "id": "ce57218f",
    "metadata": {
     "editable": true
    },
@@ -412,7 +412,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "397a0e28",
+   "id": "e40a4cac",
    "metadata": {
     "editable": true
    },
@@ -424,7 +424,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "69de8cfd",
+   "id": "2eafcd65",
    "metadata": {
     "editable": true
    },
@@ -434,7 +434,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "d29ad122",
+   "id": "bdb8d75d",
    "metadata": {
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@@ -448,7 +448,7 @@
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    "cell_type": "markdown",
-   "id": "60ffe26f",
+   "id": "7304cc0b",
    "metadata": {
     "editable": true
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@@ -460,7 +460,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4a46900d",
+   "id": "d04b9c03",
    "metadata": {
     "editable": true
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@@ -470,7 +470,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2d334287",
+   "id": "43c885d7",
    "metadata": {
     "editable": true
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@@ -482,7 +482,7 @@
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   {
    "cell_type": "markdown",
-   "id": "07bbf1c5",
+   "id": "46bde37c",
    "metadata": {
     "editable": true
    },
@@ -494,7 +494,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "0f6955e9",
+   "id": "a0b72eb7",
    "metadata": {
     "editable": true
    },
@@ -514,7 +514,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "016a3ed1",
+   "id": "5b7485f1",
    "metadata": {
     "editable": true
    },
@@ -530,7 +530,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e687408a",
+   "id": "4ba6228a",
    "metadata": {
     "editable": true
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@@ -546,7 +546,7 @@
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   {
    "cell_type": "markdown",
-   "id": "8153a1ef",
+   "id": "30380d0c",
    "metadata": {
     "editable": true
    },
@@ -557,7 +557,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8a6508af",
+   "id": "23c99855",
    "metadata": {
     "editable": true
    },
@@ -569,7 +569,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "81ecbeb8",
+   "id": "08273eaa",
    "metadata": {
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@@ -579,7 +579,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "73ffd285",
+   "id": "e77fa937",
    "metadata": {
     "editable": true
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@@ -591,7 +591,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e3230763",
+   "id": "52d8ac79",
    "metadata": {
     "editable": true
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@@ -601,7 +601,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "fcd1e9f5",
+   "id": "c749910f",
    "metadata": {
     "editable": true
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@@ -613,7 +613,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "c162cd0f",
+   "id": "ce3de0ff",
    "metadata": {
     "editable": true
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@@ -635,7 +635,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ae042626",
+   "id": "7e046c1f",
    "metadata": {
     "editable": true
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@@ -648,7 +648,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "c15dcfe7",
+   "id": "6b1748dc",
    "metadata": {
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@@ -661,7 +661,7 @@
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   {
    "cell_type": "markdown",
-   "id": "f441f82b",
+   "id": "81266388",
    "metadata": {
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@@ -671,7 +671,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "0bcf9fbb",
+   "id": "b8b28a01",
    "metadata": {
     "editable": true
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@@ -689,7 +689,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a5ce05a3",
+   "id": "a37caf24",
    "metadata": {
     "editable": true
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@@ -699,7 +699,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "537bd35d",
+   "id": "4421201b",
    "metadata": {
     "editable": true
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@@ -714,7 +714,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "c1ea25fd",
+   "id": "156aa5ac",
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@@ -724,7 +724,7 @@
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-   "id": "f86025d3",
+   "id": "19c663a4",
    "metadata": {
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@@ -738,7 +738,7 @@
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   {
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-   "id": "6eab3c0f",
+   "id": "fab6f264",
    "metadata": {
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@@ -748,7 +748,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "64eb342e",
+   "id": "d3726f16",
    "metadata": {
     "editable": true
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@@ -762,7 +762,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "74504c64",
+   "id": "091973c9",
    "metadata": {
     "editable": true
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@@ -777,7 +777,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "888900dc",
+   "id": "2042ba02",
    "metadata": {
     "editable": true
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@@ -794,7 +794,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9ef0d6b7",
+   "id": "66e3647e",
    "metadata": {
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@@ -806,7 +806,7 @@
   },
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    "cell_type": "markdown",
-   "id": "711f9890",
+   "id": "038d29b8",
    "metadata": {
     "editable": true
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@@ -820,7 +820,7 @@
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    "cell_type": "markdown",
-   "id": "5f512c94",
+   "id": "7b2aec41",
    "metadata": {
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@@ -835,7 +835,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "20ebe957",
+   "id": "c5344c2b",
    "metadata": {
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@@ -847,7 +847,7 @@
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-   "id": "24bfec40",
+   "id": "e42471e7",
    "metadata": {
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@@ -858,7 +858,7 @@
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   {
    "cell_type": "markdown",
-   "id": "afa92ed3",
+   "id": "b38320ec",
    "metadata": {
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@@ -886,7 +886,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "be78c7ff",
+   "id": "792e177b",
    "metadata": {
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@@ -908,7 +908,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "b48631d0",
+   "id": "760fca67",
    "metadata": {
     "editable": true
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@@ -930,7 +930,7 @@
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   {
    "cell_type": "markdown",
-   "id": "74f9b42d",
+   "id": "52452fa9",
    "metadata": {
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@@ -942,7 +942,7 @@
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   {
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-   "id": "1f3c24ad",
+   "id": "3dffb542",
    "metadata": {
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@@ -979,7 +979,7 @@
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-   "id": "cef1cbcf",
+   "id": "24a9cadc",
    "metadata": {
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@@ -1007,7 +1007,7 @@
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-   "id": "b48fc102",
+   "id": "b9748fe1",
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@@ -1037,7 +1037,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8771707f",
+   "id": "4d93454f",
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@@ -1057,7 +1057,7 @@
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   {
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-   "id": "e3699e3c",
+   "id": "3b02576e",
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@@ -1069,7 +1069,7 @@
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-   "id": "3fe85e9b",
+   "id": "c34de3f5",
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@@ -1079,7 +1079,7 @@
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-   "id": "2d274e5f",
+   "id": "cfc60396",
    "metadata": {
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@@ -1091,7 +1091,7 @@
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-   "id": "1d8977ca",
+   "id": "b6bc2825",
    "metadata": {
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@@ -1103,7 +1103,7 @@
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+   "id": "71cce93d",
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@@ -1115,7 +1115,7 @@
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-   "id": "4e1a0f0f",
+   "id": "39b1c049",
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@@ -1127,7 +1127,7 @@
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   {
    "cell_type": "markdown",
-   "id": "e3cbbeae",
+   "id": "ab1ecb22",
    "metadata": {
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@@ -1138,7 +1138,7 @@
   },
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-   "id": "76da825c",
+   "id": "a3495238",
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@@ -1151,7 +1151,7 @@
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-   "id": "5ca66074",
+   "id": "44d95f33",
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@@ -1163,7 +1163,7 @@
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-   "id": "e656b7c1",
+   "id": "694edeb5",
    "metadata": {
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@@ -1173,7 +1173,7 @@
   },
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    "cell_type": "markdown",
-   "id": "95dc0049",
+   "id": "4ec42882",
    "metadata": {
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@@ -1185,7 +1185,7 @@
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+   "id": "5e3ada87",
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@@ -1195,7 +1195,7 @@
   },
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-   "id": "a0363bec",
+   "id": "f996558a",
    "metadata": {
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@@ -1206,7 +1206,7 @@
   },
   {
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-   "id": "c8baf68f",
+   "id": "043db570",
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@@ -1218,7 +1218,7 @@
   },
   {
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-   "id": "d6e62d6a",
+   "id": "b2e31383",
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@@ -1230,7 +1230,7 @@
   },
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    "cell_type": "markdown",
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@@ -1242,7 +1242,7 @@
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@@ -1253,7 +1253,7 @@
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@@ -1264,7 +1264,7 @@
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@@ -1276,7 +1276,7 @@
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@@ -1286,7 +1286,7 @@
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@@ -1298,7 +1298,7 @@
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@@ -1308,7 +1308,7 @@
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@@ -1320,7 +1320,7 @@
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@@ -1330,7 +1330,7 @@
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@@ -1342,7 +1342,7 @@
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@@ -1352,7 +1352,7 @@
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@@ -1364,7 +1364,7 @@
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@@ -1375,7 +1375,7 @@
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@@ -1406,7 +1406,7 @@
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@@ -1417,7 +1417,7 @@
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@@ -1431,7 +1431,7 @@
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@@ -1442,7 +1442,7 @@
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@@ -1455,7 +1455,7 @@
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@@ -1466,7 +1466,7 @@
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@@ -1484,7 +1484,7 @@
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@@ -1495,7 +1495,7 @@
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@@ -1510,7 +1510,7 @@
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@@ -1520,7 +1520,7 @@
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@@ -1534,7 +1534,7 @@
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@@ -1546,7 +1546,7 @@
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@@ -1557,7 +1557,7 @@
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@@ -1569,7 +1569,7 @@
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@@ -1580,7 +1580,7 @@
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@@ -1591,7 +1591,7 @@
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@@ -1603,7 +1603,7 @@
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@@ -1613,7 +1613,7 @@
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@@ -1625,7 +1625,7 @@
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@@ -1637,7 +1637,7 @@
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@@ -1649,7 +1649,7 @@
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@@ -1661,7 +1661,7 @@
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@@ -1672,7 +1672,7 @@
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@@ -1684,7 +1684,7 @@
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@@ -1694,7 +1694,7 @@
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@@ -1706,7 +1706,7 @@
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@@ -1716,7 +1716,7 @@
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@@ -1728,7 +1728,7 @@
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@@ -1748,7 +1748,7 @@
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@@ -1760,7 +1760,7 @@
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@@ -1770,7 +1770,7 @@
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@@ -1782,7 +1782,7 @@
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@@ -1792,7 +1792,7 @@
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@@ -1803,7 +1803,7 @@
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@@ -1815,7 +1815,7 @@
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@@ -1827,7 +1827,7 @@
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@@ -1839,7 +1839,7 @@
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@@ -1852,7 +1852,7 @@
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@@ -1863,7 +1863,7 @@
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@@ -1875,7 +1875,7 @@
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@@ -1891,7 +1891,7 @@
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@@ -1903,7 +1903,7 @@
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@@ -1914,7 +1914,7 @@
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@@ -1926,7 +1926,7 @@
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@@ -1936,7 +1936,7 @@
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@@ -1948,7 +1948,7 @@
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@@ -1958,7 +1958,7 @@
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@@ -1970,7 +1970,7 @@
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@@ -1980,7 +1980,7 @@
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@@ -1992,7 +1992,7 @@
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@@ -2016,7 +2016,7 @@
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@@ -2029,7 +2029,7 @@
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@@ -2040,7 +2040,7 @@
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@@ -2052,7 +2052,7 @@
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@@ -2062,7 +2062,7 @@
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@@ -2074,7 +2074,7 @@
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@@ -2088,7 +2088,7 @@
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@@ -2104,7 +2104,7 @@
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@@ -2114,7 +2114,7 @@
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@@ -2126,7 +2126,7 @@
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@@ -2136,7 +2136,7 @@
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@@ -2148,7 +2148,7 @@
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@@ -2162,7 +2162,7 @@
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@@ -2172,7 +2172,7 @@
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@@ -2183,7 +2183,7 @@
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@@ -2198,7 +2198,7 @@
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@@ -2208,7 +2208,7 @@
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@@ -2220,7 +2220,7 @@
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@@ -2232,7 +2232,7 @@
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@@ -2247,7 +2247,7 @@
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@@ -2260,7 +2260,7 @@
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@@ -2317,7 +2317,7 @@
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@@ -2328,7 +2328,7 @@
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@@ -2355,7 +2355,7 @@
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@@ -2367,7 +2367,7 @@
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@@ -2379,7 +2379,7 @@
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@@ -2389,7 +2389,7 @@
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@@ -2403,7 +2403,7 @@
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@@ -2413,7 +2413,7 @@
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@@ -2425,7 +2425,7 @@
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@@ -2436,7 +2436,7 @@
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@@ -2451,7 +2451,7 @@
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@@ -2465,7 +2465,7 @@
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@@ -2476,7 +2476,7 @@
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@@ -2537,7 +2537,7 @@
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@@ -2559,7 +2559,7 @@
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@@ -2571,7 +2571,7 @@
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@@ -2581,7 +2581,7 @@
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-   "id": "de4176bc",
+   "id": "3227c51a",
    "metadata": {
     "editable": true
    },
@@ -2598,7 +2598,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "6ae32c9d",
+   "id": "d414c535",
    "metadata": {
     "editable": true
    },
@@ -2611,7 +2611,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4897da29",
+   "id": "0c25b0fc",
    "metadata": {
     "editable": true
    },
@@ -2624,7 +2624,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9fbdb5d3",
+   "id": "23dca3ab",
    "metadata": {
     "editable": true
    },
@@ -2637,7 +2637,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "3c2d61cb",
+   "id": "3b169c06",
    "metadata": {
     "editable": true
    },
@@ -2651,7 +2651,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "89bee80f",
+   "id": "d7ce6406",
    "metadata": {
     "editable": true
    },
@@ -2673,7 +2673,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "5a5d1781",
+   "id": "0a528877",
    "metadata": {
     "editable": true
    },
@@ -2688,7 +2688,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "fa2f5d32",
+   "id": "0f93ca5e",
    "metadata": {
     "editable": true
    },
@@ -2700,7 +2700,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "682c24e0",
+   "id": "1d87bd14",
    "metadata": {
     "editable": true
    },
@@ -2713,7 +2713,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9d1616d5",
+   "id": "4181f46b",
    "metadata": {
     "editable": true
    },
@@ -2727,7 +2727,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4727394c",
+   "id": "af66da80",
    "metadata": {
     "editable": true
    },
@@ -2738,7 +2738,7 @@
   {
    "cell_type": "code",
    "execution_count": 13,
-   "id": "416e28d2",
+   "id": "83e51ad8",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -2763,7 +2763,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "aab85c9b",
+   "id": "e73bde3d",
    "metadata": {
     "editable": true
    },
@@ -2779,7 +2779,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "deccca01",
+   "id": "97d463c4",
    "metadata": {
     "editable": true
    },
@@ -2800,7 +2800,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f29f65b8",
+   "id": "cc362c51",
    "metadata": {
     "editable": true
    },
@@ -2823,7 +2823,7 @@
   {
    "cell_type": "code",
    "execution_count": 14,
-   "id": "92349988",
+   "id": "0716d374",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -2858,7 +2858,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "fd9af7b6",
+   "id": "f7480cca",
    "metadata": {
     "editable": true
    },
@@ -2869,7 +2869,7 @@
   {
    "cell_type": "code",
    "execution_count": 15,
-   "id": "2ffb14c6",
+   "id": "440f74c2",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -2945,7 +2945,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9f39fc35",
+   "id": "c3d4f269",
    "metadata": {
     "editable": true
    },
@@ -2955,7 +2955,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "bd845e63",
+   "id": "21369b43",
    "metadata": {
     "editable": true
    },
@@ -2968,7 +2968,7 @@
   {
    "cell_type": "code",
    "execution_count": 16,
-   "id": "b8c2c078",
+   "id": "00fc4272",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -3023,9 +3023,9 @@
     "for epoch in range(n_epochs):\n",
     "# Can you figure out a better way of setting up the contributions to each batch?\n",
     "    for i in range(m):\n",
-    "        random_index = np.random.randint(m)\n",
-    "        xi = X[random_index*M:random_index*M+M]\n",
-    "        yi = y[random_index*M:random_index*M+M]\n",
+    "        random_index = M*np.random.randint(m)\n",
+    "        xi = X[random_index:random_index+M]\n",
+    "        yi = y[random_index:random_index+M]\n",
     "        gradients = (2.0/M)* xi.T @ ((xi @ theta)-yi)\n",
     "        eta = learning_schedule(epoch*m+i)\n",
     "        theta = theta - eta*gradients\n",
diff --git a/doc/pub/week40/html/._week40-bs012.html b/doc/pub/week40/html/._week40-bs012.html
index e5d5a3168..dcbe5895a 100644
--- a/doc/pub/week40/html/._week40-bs012.html
+++ b/doc/pub/week40/html/._week40-bs012.html
@@ -365,9 +365,9 @@ theta <span style="color: #666666">=</span> np<span style="color: #666666">.</sp
 <span style="color: #008000; font-weight: bold">for</span> epoch <span style="color: #AA22FF; font-weight: bold">in</span> <span style="color: #008000">range</span>(n_epochs):
 <span style="color: #408080; font-style: italic"># Can you figure out a better way of setting up the contributions to each batch?</span>
     <span style="color: #008000; font-weight: bold">for</span> i <span style="color: #AA22FF; font-weight: bold">in</span> <span style="color: #008000">range</span>(m):
-        random_index <span style="color: #666666">=</span> np<span style="color: #666666">.</span>random<span style="color: #666666">.</span>randint(m)
-        xi <span style="color: #666666">=</span> X[random_index<span style="color: #666666">*</span>M:random_index<span style="color: #666666">*</span>M<span style="color: #666666">+</span>M]
-        yi <span style="color: #666666">=</span> y[random_index<span style="color: #666666">*</span>M:random_index<span style="color: #666666">*</span>M<span style="color: #666666">+</span>M]
+        random_index <span style="color: #666666">=</span> M<span style="color: #666666">*</span>np<span style="color: #666666">.</span>random<span style="color: #666666">.</span>randint(m)
+        xi <span style="color: #666666">=</span> X[random_index:random_index<span style="color: #666666">+</span>M]
+        yi <span style="color: #666666">=</span> y[random_index:random_index<span style="color: #666666">+</span>M]
         gradients <span style="color: #666666">=</span> (<span style="color: #666666">2.0/</span>M)<span style="color: #666666">*</span> xi<span style="color: #666666">.</span>T <span style="color: #666666">@</span> ((xi <span style="color: #666666">@</span> theta)<span style="color: #666666">-</span>yi)
         eta <span style="color: #666666">=</span> learning_schedule(epoch<span style="color: #666666">*</span>m<span style="color: #666666">+</span>i)
         theta <span style="color: #666666">=</span> theta <span style="color: #666666">-</span> eta<span style="color: #666666">*</span>gradients
diff --git a/doc/pub/week40/html/week40-reveal.html b/doc/pub/week40/html/week40-reveal.html
index 3aad4d3c1..cc773c1c2 100644
--- a/doc/pub/week40/html/week40-reveal.html
+++ b/doc/pub/week40/html/week40-reveal.html
@@ -547,9 +547,9 @@ theta = np.random.randn(<span style="color: #B452CD">2</span>,<span style="color
 <span style="color: #8B008B; font-weight: bold">for</span> epoch <span style="color: #8B008B">in</span> <span style="color: #658b00">range</span>(n_epochs):
 <span style="color: #228B22"># Can you figure out a better way of setting up the contributions to each batch?</span>
     <span style="color: #8B008B; font-weight: bold">for</span> i <span style="color: #8B008B">in</span> <span style="color: #658b00">range</span>(m):
-        random_index = np.random.randint(m)
-        xi = X[random_index*M:random_index*M+M]
-        yi = y[random_index*M:random_index*M+M]
+        random_index = M*np.random.randint(m)
+        xi = X[random_index:random_index+M]
+        yi = y[random_index:random_index+M]
         gradients = (<span style="color: #B452CD">2.0</span>/M)* xi.T @ ((xi @ theta)-yi)
         eta = learning_schedule(epoch*m+i)
         theta = theta - eta*gradients
diff --git a/doc/pub/week40/html/week40-solarized.html b/doc/pub/week40/html/week40-solarized.html
index d3532d62a..9cf4831de 100644
--- a/doc/pub/week40/html/week40-solarized.html
+++ b/doc/pub/week40/html/week40-solarized.html
@@ -594,9 +594,9 @@ theta = np.random.randn(<span style="color: #B452CD">2</span>,<span style="color
 <span style="color: #8B008B; font-weight: bold">for</span> epoch <span style="color: #8B008B">in</span> <span style="color: #658b00">range</span>(n_epochs):
 <span style="color: #228B22"># Can you figure out a better way of setting up the contributions to each batch?</span>
     <span style="color: #8B008B; font-weight: bold">for</span> i <span style="color: #8B008B">in</span> <span style="color: #658b00">range</span>(m):
-        random_index = np.random.randint(m)
-        xi = X[random_index*M:random_index*M+M]
-        yi = y[random_index*M:random_index*M+M]
+        random_index = M*np.random.randint(m)
+        xi = X[random_index:random_index+M]
+        yi = y[random_index:random_index+M]
         gradients = (<span style="color: #B452CD">2.0</span>/M)* xi.T @ ((xi @ theta)-yi)
         eta = learning_schedule(epoch*m+i)
         theta = theta - eta*gradients
diff --git a/doc/pub/week40/html/week40.html b/doc/pub/week40/html/week40.html
index da6c5d4ee..952eee87b 100644
--- a/doc/pub/week40/html/week40.html
+++ b/doc/pub/week40/html/week40.html
@@ -671,9 +671,9 @@ theta <span style="color: #666666">=</span> np<span style="color: #666666">.</sp
 <span style="color: #008000; font-weight: bold">for</span> epoch <span style="color: #AA22FF; font-weight: bold">in</span> <span style="color: #008000">range</span>(n_epochs):
 <span style="color: #408080; font-style: italic"># Can you figure out a better way of setting up the contributions to each batch?</span>
     <span style="color: #008000; font-weight: bold">for</span> i <span style="color: #AA22FF; font-weight: bold">in</span> <span style="color: #008000">range</span>(m):
-        random_index <span style="color: #666666">=</span> np<span style="color: #666666">.</span>random<span style="color: #666666">.</span>randint(m)
-        xi <span style="color: #666666">=</span> X[random_index<span style="color: #666666">*</span>M:random_index<span style="color: #666666">*</span>M<span style="color: #666666">+</span>M]
-        yi <span style="color: #666666">=</span> y[random_index<span style="color: #666666">*</span>M:random_index<span style="color: #666666">*</span>M<span style="color: #666666">+</span>M]
+        random_index <span style="color: #666666">=</span> M<span style="color: #666666">*</span>np<span style="color: #666666">.</span>random<span style="color: #666666">.</span>randint(m)
+        xi <span style="color: #666666">=</span> X[random_index:random_index<span style="color: #666666">+</span>M]
+        yi <span style="color: #666666">=</span> y[random_index:random_index<span style="color: #666666">+</span>M]
         gradients <span style="color: #666666">=</span> (<span style="color: #666666">2.0/</span>M)<span style="color: #666666">*</span> xi<span style="color: #666666">.</span>T <span style="color: #666666">@</span> ((xi <span style="color: #666666">@</span> theta)<span style="color: #666666">-</span>yi)
         eta <span style="color: #666666">=</span> learning_schedule(epoch<span style="color: #666666">*</span>m<span style="color: #666666">+</span>i)
         theta <span style="color: #666666">=</span> theta <span style="color: #666666">-</span> eta<span style="color: #666666">*</span>gradients
diff --git a/doc/pub/week40/ipynb/ipynb-week40-src.tar.gz b/doc/pub/week40/ipynb/ipynb-week40-src.tar.gz
index 7878018fcac7c2541dd22ae2fef9259cdba8d82e..61f42d6a114078c669bf0ea2ad972fbd5131f760 100644
GIT binary patch
delta 17
YcmbQ%!!)gjiA}zngQ3fKBbz`Q05G2g3jhEB

delta 17
YcmbQ%!!)gjiA}zngTdKwBbz`Q050nU!T<mO

diff --git a/doc/pub/week40/ipynb/week40.ipynb b/doc/pub/week40/ipynb/week40.ipynb
index 48a946bd2..e7a165740 100644
--- a/doc/pub/week40/ipynb/week40.ipynb
+++ b/doc/pub/week40/ipynb/week40.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "markdown",
-   "id": "8c1bc594",
+   "id": "44dffed8",
    "metadata": {
     "editable": true
    },
@@ -14,7 +14,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "532d5f80",
+   "id": "24bd602e",
    "metadata": {
     "editable": true
    },
@@ -29,7 +29,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "642ef5f2",
+   "id": "9fa291da",
    "metadata": {
     "editable": true
    },
@@ -51,7 +51,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "388d28a9",
+   "id": "558ad3d2",
    "metadata": {
     "editable": true
    },
@@ -63,7 +63,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "811c319c",
+   "id": "6200d2c2",
    "metadata": {
     "editable": true
    },
@@ -85,7 +85,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4e7a70d6",
+   "id": "8586454c",
    "metadata": {
     "editable": true
    },
@@ -117,7 +117,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1a453559",
+   "id": "0387c628",
    "metadata": {
     "editable": true
    },
@@ -134,7 +134,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "323d7ab6",
+   "id": "98cbfbda",
    "metadata": {
     "editable": true
    },
@@ -147,7 +147,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "61f145c0",
+   "id": "50edee62",
    "metadata": {
     "editable": true
    },
@@ -160,7 +160,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "954c1b01",
+   "id": "32331cab",
    "metadata": {
     "editable": true
    },
@@ -173,7 +173,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "942eeb65",
+   "id": "03106238",
    "metadata": {
     "editable": true
    },
@@ -187,7 +187,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f901816b",
+   "id": "814f28cf",
    "metadata": {
     "editable": true
    },
@@ -210,7 +210,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e3aba58e",
+   "id": "3129597d",
    "metadata": {
     "editable": true
    },
@@ -225,7 +225,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4ca91e49",
+   "id": "6ca9f6b1",
    "metadata": {
     "editable": true
    },
@@ -237,7 +237,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e1c5e217",
+   "id": "3c541968",
    "metadata": {
     "editable": true
    },
@@ -250,7 +250,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "c2ad92a4",
+   "id": "80d5fe29",
    "metadata": {
     "editable": true
    },
@@ -264,7 +264,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f54810af",
+   "id": "415a444d",
    "metadata": {
     "editable": true
    },
@@ -275,7 +275,7 @@
   {
    "cell_type": "code",
    "execution_count": 1,
-   "id": "b6d7a087",
+   "id": "a7f3672a",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -300,7 +300,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "aa6b9db7",
+   "id": "76d986f0",
    "metadata": {
     "editable": true
    },
@@ -316,7 +316,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "52dba806",
+   "id": "9e98c43b",
    "metadata": {
     "editable": true
    },
@@ -337,7 +337,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "256088f6",
+   "id": "21aaf596",
    "metadata": {
     "editable": true
    },
@@ -360,7 +360,7 @@
   {
    "cell_type": "code",
    "execution_count": 2,
-   "id": "f3809eae",
+   "id": "5f53f1a0",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -395,7 +395,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f8bcda50",
+   "id": "7370236e",
    "metadata": {
     "editable": true
    },
@@ -405,7 +405,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "02040fa6",
+   "id": "a7dc58ac",
    "metadata": {
     "editable": true
    },
@@ -416,7 +416,7 @@
   {
    "cell_type": "code",
    "execution_count": 3,
-   "id": "e7919c6b",
+   "id": "c054c431",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -474,9 +474,9 @@
     "for epoch in range(n_epochs):\n",
     "# Can you figure out a better way of setting up the contributions to each batch?\n",
     "    for i in range(m):\n",
-    "        random_index = np.random.randint(m)\n",
-    "        xi = X[random_index*M:random_index*M+M]\n",
-    "        yi = y[random_index*M:random_index*M+M]\n",
+    "        random_index = M*np.random.randint(m)\n",
+    "        xi = X[random_index:random_index+M]\n",
+    "        yi = y[random_index:random_index+M]\n",
     "        gradients = (2.0/M)* xi.T @ ((xi @ theta)-yi)\n",
     "        eta = learning_schedule(epoch*m+i)\n",
     "        theta = theta - eta*gradients\n",
@@ -498,7 +498,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "5d71ac48",
+   "id": "19ca5975",
    "metadata": {
     "editable": true
    },
@@ -513,7 +513,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "867a9b01",
+   "id": "9c652bcb",
    "metadata": {
     "editable": true
    },
@@ -525,7 +525,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "0f97fa56",
+   "id": "0e758830",
    "metadata": {
     "editable": true
    },
@@ -543,7 +543,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "5a094f0e",
+   "id": "75435924",
    "metadata": {
     "editable": true
    },
@@ -562,7 +562,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "16711622",
+   "id": "8f831559",
    "metadata": {
     "editable": true
    },
@@ -574,7 +574,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e98517fe",
+   "id": "2e4d9fb3",
    "metadata": {
     "editable": true
    },
@@ -584,7 +584,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e1a15dbb",
+   "id": "c5cfcbe2",
    "metadata": {
     "editable": true
    },
@@ -600,7 +600,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a70edb37",
+   "id": "a812b62a",
    "metadata": {
     "editable": true
    },
@@ -612,7 +612,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "6696a85a",
+   "id": "797d4b91",
    "metadata": {
     "editable": true
    },
@@ -622,7 +622,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e16a6dca",
+   "id": "fa197b36",
    "metadata": {
     "editable": true
    },
@@ -634,7 +634,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "7dcdf569",
+   "id": "97504291",
    "metadata": {
     "editable": true
    },
@@ -644,7 +644,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "0ff6cc5b",
+   "id": "f7582df0",
    "metadata": {
     "editable": true
    },
@@ -656,7 +656,7 @@
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@@ -672,7 +672,7 @@
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@@ -684,7 +684,7 @@
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@@ -717,7 +717,7 @@
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@@ -729,7 +729,7 @@
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@@ -747,7 +747,7 @@
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@@ -757,7 +757,7 @@
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@@ -788,7 +788,7 @@
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@@ -803,7 +803,7 @@
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@@ -821,7 +821,7 @@
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@@ -833,7 +833,7 @@
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@@ -845,7 +845,7 @@
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@@ -863,7 +863,7 @@
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@@ -886,7 +886,7 @@
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@@ -904,7 +904,7 @@
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@@ -916,7 +916,7 @@
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@@ -928,7 +928,7 @@
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@@ -940,7 +940,7 @@
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@@ -952,7 +952,7 @@
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@@ -964,7 +964,7 @@
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@@ -981,7 +981,7 @@
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@@ -1000,7 +1000,7 @@
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@@ -1012,7 +1012,7 @@
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@@ -1032,7 +1032,7 @@
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@@ -1070,7 +1070,7 @@
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@@ -1082,7 +1082,7 @@
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@@ -1092,7 +1092,7 @@
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@@ -1104,7 +1104,7 @@
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@@ -1115,7 +1115,7 @@
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@@ -1160,7 +1160,7 @@
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@@ -1177,7 +1177,7 @@
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@@ -1205,7 +1205,7 @@
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@@ -1220,7 +1220,7 @@
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@@ -1264,7 +1264,7 @@
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@@ -1274,7 +1274,7 @@
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@@ -1285,7 +1285,7 @@
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@@ -1313,7 +1313,7 @@
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@@ -1328,7 +1328,7 @@
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@@ -1339,7 +1339,7 @@
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@@ -1367,7 +1367,7 @@
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@@ -1378,7 +1378,7 @@
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@@ -1403,7 +1403,7 @@
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@@ -1414,7 +1414,7 @@
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@@ -1450,7 +1450,7 @@
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@@ -1470,7 +1470,7 @@
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@@ -1481,7 +1481,7 @@
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@@ -1519,7 +1519,7 @@
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@@ -1529,7 +1529,7 @@
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@@ -1543,7 +1543,7 @@
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@@ -1565,7 +1565,7 @@
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@@ -1575,7 +1575,7 @@
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@@ -1586,7 +1586,7 @@
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@@ -1608,7 +1608,7 @@
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@@ -1621,7 +1621,7 @@
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@@ -1646,7 +1646,7 @@
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@@ -1658,7 +1658,7 @@
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@@ -1673,7 +1673,7 @@
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@@ -1687,7 +1687,7 @@
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@@ -1705,7 +1705,7 @@
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@@ -1729,7 +1729,7 @@
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@@ -1747,7 +1747,7 @@
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@@ -1787,7 +1787,7 @@
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@@ -1816,7 +1816,7 @@
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@@ -1837,7 +1837,7 @@
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@@ -1866,7 +1866,7 @@
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@@ -1887,7 +1887,7 @@
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@@ -1908,7 +1908,7 @@
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@@ -1925,7 +1925,7 @@
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@@ -1946,7 +1946,7 @@
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@@ -1962,7 +1962,7 @@
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@@ -1979,7 +1979,7 @@
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@@ -2020,7 +2020,7 @@
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@@ -2030,7 +2030,7 @@
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@@ -2041,7 +2041,7 @@
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@@ -2101,7 +2101,7 @@
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@@ -2111,7 +2111,7 @@
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@@ -2122,7 +2122,7 @@
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@@ -2142,7 +2142,7 @@
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@@ -2154,7 +2154,7 @@
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@@ -2166,7 +2166,7 @@
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@@ -2181,7 +2181,7 @@
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@@ -2193,7 +2193,7 @@
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@@ -2210,7 +2210,7 @@
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@@ -2225,7 +2225,7 @@
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@@ -2243,7 +2243,7 @@
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@@ -2255,7 +2255,7 @@
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@@ -2273,7 +2273,7 @@
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@@ -2286,7 +2286,7 @@
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@@ -2298,7 +2298,7 @@
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@@ -2316,7 +2316,7 @@
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@@ -2334,7 +2334,7 @@
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@@ -2344,7 +2344,7 @@
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@@ -2362,7 +2362,7 @@
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@@ -2381,7 +2381,7 @@
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@@ -2394,7 +2394,7 @@
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@@ -2412,7 +2412,7 @@
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@@ -2423,7 +2423,7 @@
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@@ -2442,7 +2442,7 @@
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@@ -2460,7 +2460,7 @@
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@@ -2473,7 +2473,7 @@
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@@ -2493,7 +2493,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "480ff354",
+   "id": "03122fc0",
    "metadata": {
     "editable": true
    },
@@ -2526,7 +2526,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "94619368",
+   "id": "8e182c43",
    "metadata": {
     "editable": true
    },
@@ -2538,7 +2538,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "388ff7f4",
+   "id": "d6222603",
    "metadata": {
     "editable": true
    },
@@ -2557,7 +2557,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "d9d7c987",
+   "id": "a18b794e",
    "metadata": {
     "editable": true
    },
@@ -2571,7 +2571,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8a3e33b4",
+   "id": "c1374a72",
    "metadata": {
     "editable": true
    },
@@ -2594,7 +2594,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "30971d96",
+   "id": "cdd7a335",
    "metadata": {
     "editable": true
    },
@@ -2613,7 +2613,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1471a891",
+   "id": "f1a990bf",
    "metadata": {
     "editable": true
    },
@@ -2625,7 +2625,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "c0d00750",
+   "id": "ef2dad05",
    "metadata": {
     "editable": true
    },
@@ -2635,7 +2635,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "05c9d4ee",
+   "id": "d050a400",
    "metadata": {
     "editable": true
    },
@@ -2647,7 +2647,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1406fbbe",
+   "id": "411f78a9",
    "metadata": {
     "editable": true
    },
@@ -2664,7 +2664,7 @@
   {
    "cell_type": "code",
    "execution_count": 20,
-   "id": "65d6a383",
+   "id": "6cf5e680",
    "metadata": {
     "collapsed": false,
     "editable": true
@@ -2746,7 +2746,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9f0fe103",
+   "id": "cd94f1b9",
    "metadata": {
     "editable": true
    },
@@ -2784,7 +2784,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "d8ec7ed4",
+   "id": "63bec6f4",
    "metadata": {
     "editable": true
    },
@@ -2814,7 +2814,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9a8b3d4b",
+   "id": "4ced21f4",
    "metadata": {
     "editable": true
    },
@@ -2835,7 +2835,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "21e1e7a1",
+   "id": "32ffc25f",
    "metadata": {
     "editable": true
    },
@@ -2847,7 +2847,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "100a1461",
+   "id": "5916c261",
    "metadata": {
     "editable": true
    },
@@ -2862,7 +2862,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "fcc4eef2",
+   "id": "848287b3",
    "metadata": {
     "editable": true
    },
@@ -2879,7 +2879,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a25f726d",
+   "id": "fab97f92",
    "metadata": {
     "editable": true
    },
@@ -2891,7 +2891,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "0d98d20e",
+   "id": "c0cb4b64",
    "metadata": {
     "editable": true
    },
@@ -2904,7 +2904,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2f4c366c",
+   "id": "6bde395f",
    "metadata": {
     "editable": true
    },
@@ -2916,7 +2916,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "6dd7c96e",
+   "id": "843e4d8f",
    "metadata": {
     "editable": true
    },
@@ -2930,7 +2930,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a513b6e5",
+   "id": "00476455",
    "metadata": {
     "editable": true
    },
@@ -2942,7 +2942,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2af99fb5",
+   "id": "9468aea4",
    "metadata": {
     "editable": true
    },
@@ -2954,7 +2954,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "988f1325",
+   "id": "919d6489",
    "metadata": {
     "editable": true
    },
@@ -2966,7 +2966,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ccd7f26c",
+   "id": "c3753933",
    "metadata": {
     "editable": true
    },
@@ -2976,7 +2976,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "12e11580",
+   "id": "5eb0cae9",
    "metadata": {
     "editable": true
    },
@@ -2988,7 +2988,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1e70b838",
+   "id": "636ac3d5",
    "metadata": {
     "editable": true
    },
@@ -2998,7 +2998,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1edf7ab2",
+   "id": "73606c95",
    "metadata": {
     "editable": true
    },
@@ -3010,7 +3010,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "d36fd2da",
+   "id": "b53b50a9",
    "metadata": {
     "editable": true
    },
@@ -3024,7 +3024,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4ee56ad9",
+   "id": "0866f680",
    "metadata": {
     "editable": true
    },
@@ -3036,7 +3036,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "160efabd",
+   "id": "035e9ec2",
    "metadata": {
     "editable": true
    },
@@ -3046,7 +3046,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "cab136bb",
+   "id": "bce6aaef",
    "metadata": {
     "editable": true
    },
@@ -3058,7 +3058,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "217ca399",
+   "id": "ec649282",
    "metadata": {
     "editable": true
    },
@@ -3068,7 +3068,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "63747f21",
+   "id": "43ff5678",
    "metadata": {
     "editable": true
    },
@@ -3080,7 +3080,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "54d3e3e3",
+   "id": "96cad493",
    "metadata": {
     "editable": true
    },
@@ -3092,7 +3092,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f6ec4ea3",
+   "id": "29e473d3",
    "metadata": {
     "editable": true
    },
@@ -3104,7 +3104,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1f48793d",
+   "id": "12702264",
    "metadata": {
     "editable": true
    },
@@ -3114,7 +3114,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e340e6d7",
+   "id": "114eb638",
    "metadata": {
     "editable": true
    },
@@ -3126,7 +3126,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ba026ba1",
+   "id": "64cae220",
    "metadata": {
     "editable": true
    },
@@ -3136,7 +3136,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "836235e1",
+   "id": "abf61730",
    "metadata": {
     "editable": true
    },
@@ -3148,7 +3148,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4c7e35e8",
+   "id": "3f415d4f",
    "metadata": {
     "editable": true
    },
@@ -3172,7 +3172,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "5e17d297",
+   "id": "757a39df",
    "metadata": {
     "editable": true
    },
@@ -3184,7 +3184,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "90a264a8",
+   "id": "5cc7f608",
    "metadata": {
     "editable": true
    },
@@ -3194,7 +3194,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9c45cadd",
+   "id": "7c299248",
    "metadata": {
     "editable": true
    },
@@ -3206,7 +3206,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a02fe84e",
+   "id": "afedf0a2",
    "metadata": {
     "editable": true
    },
@@ -3218,7 +3218,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1123e58e",
+   "id": "75ead77a",
    "metadata": {
     "editable": true
    },
@@ -3230,7 +3230,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "b93e2324",
+   "id": "bcad7c84",
    "metadata": {
     "editable": true
    },
@@ -3240,7 +3240,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "c8c7b816",
+   "id": "5af46577",
    "metadata": {
     "editable": true
    },
@@ -3252,7 +3252,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e185ca0a",
+   "id": "34ef53c1",
    "metadata": {
     "editable": true
    },
@@ -3262,7 +3262,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "6087b111",
+   "id": "ca58e38f",
    "metadata": {
     "editable": true
    },
@@ -3276,7 +3276,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "20fc7314",
+   "id": "0cd1ce56",
    "metadata": {
     "editable": true
    },
@@ -3294,7 +3294,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "cc682107",
+   "id": "185438b5",
    "metadata": {
     "editable": true
    },
@@ -3304,7 +3304,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e048bf4d",
+   "id": "e6bfbd4a",
    "metadata": {
     "editable": true
    },
@@ -3322,7 +3322,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "6f55d291",
+   "id": "05ba16dc",
    "metadata": {
     "editable": true
    },
@@ -3332,7 +3332,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "edd966f8",
+   "id": "dd9f1985",
    "metadata": {
     "editable": true
    },
@@ -3350,7 +3350,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "d6fe086b",
+   "id": "c960bbf0",
    "metadata": {
     "editable": true
    },
@@ -3377,7 +3377,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9541d79b",
+   "id": "44c4e864",
    "metadata": {
     "editable": true
    },
@@ -3389,7 +3389,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "cba8762c",
+   "id": "dcbc35ba",
    "metadata": {
     "editable": true
    },
@@ -3401,7 +3401,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4b26de68",
+   "id": "1e1af509",
    "metadata": {
     "editable": true
    },
@@ -3411,7 +3411,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "20c4375e",
+   "id": "4801d3fa",
    "metadata": {
     "editable": true
    },
@@ -3423,7 +3423,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "be1ed1e5",
+   "id": "a6e5f681",
    "metadata": {
     "editable": true
    },
@@ -3433,7 +3433,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "261bb8b0",
+   "id": "ac6775fa",
    "metadata": {
     "editable": true
    },
@@ -3445,7 +3445,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f4f6f49c",
+   "id": "21cca2b8",
    "metadata": {
     "editable": true
    },
@@ -3455,7 +3455,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "cc0d0da1",
+   "id": "7e43f278",
    "metadata": {
     "editable": true
    },
@@ -3467,7 +3467,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "b9b6d15f",
+   "id": "34332da6",
    "metadata": {
     "editable": true
    },
@@ -3479,7 +3479,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "844d96b5",
+   "id": "d8e4eaa5",
    "metadata": {
     "editable": true
    },
@@ -3502,7 +3502,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8ace79d2",
+   "id": "794ac72f",
    "metadata": {
     "editable": true
    },
@@ -3514,7 +3514,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "6b086fb0",
+   "id": "1f210a76",
    "metadata": {
     "editable": true
    },
@@ -3524,7 +3524,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8c88ee52",
+   "id": "eef3be22",
    "metadata": {
     "editable": true
    },
@@ -3536,7 +3536,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "bbe2623b",
+   "id": "cbc3c9ad",
    "metadata": {
     "editable": true
    },
@@ -3546,7 +3546,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "dce58ee6",
+   "id": "8956c500",
    "metadata": {
     "editable": true
    },
@@ -3558,7 +3558,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "6b18fdf9",
+   "id": "ab1bfd4d",
    "metadata": {
     "editable": true
    },
@@ -3570,7 +3570,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8714fbd1",
+   "id": "79b6fe92",
    "metadata": {
     "editable": true
    },
diff --git a/doc/src/week39/week39.do.txt b/doc/src/week39/week39.do.txt
index fb69cb5bb..96e0eb799 100644
--- a/doc/src/week39/week39.do.txt
+++ b/doc/src/week39/week39.do.txt
@@ -1558,9 +1558,9 @@ theta = np.random.randn(2,1)
 for epoch in range(n_epochs):
 # Can you figure out a better way of setting up the contributions to each batch?
     for i in range(m):
-        random_index = np.random.randint(m)
-        xi = X[random_index*M:random_index*M+M]
-        yi = y[random_index*M:random_index*M+M]
+        random_index = M*np.random.randint(m)
+        xi = X[random_index:random_index+M]
+        yi = y[random_index:random_index+M]
         gradients = (2.0/M)* xi.T @ ((xi @ theta)-yi)
         eta = learning_schedule(epoch*m+i)
         theta = theta - eta*gradients
diff --git a/doc/src/week40/week40.do.txt b/doc/src/week40/week40.do.txt
index 1829183b4..3dac7ddb8 100644
--- a/doc/src/week40/week40.do.txt
+++ b/doc/src/week40/week40.do.txt
@@ -279,9 +279,9 @@ theta = np.random.randn(2,1)
 for epoch in range(n_epochs):
 # Can you figure out a better way of setting up the contributions to each batch?
     for i in range(m):
-        random_index = np.random.randint(m)
-        xi = X[random_index*M:random_index*M+M]
-        yi = y[random_index*M:random_index*M+M]
+        random_index = M*np.random.randint(m)
+        xi = X[random_index:random_index+M]
+        yi = y[random_index:random_index+M]
         gradients = (2.0/M)* xi.T @ ((xi @ theta)-yi)
         eta = learning_schedule(epoch*m+i)
         theta = theta - eta*gradients