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diff --git a/_main_files/figure-html/out-of-order-1-1.png b/_main_files/figure-html/out-of-order-1-1.png
diff --git a/_main_files/figure-html/out-of-order-2-1.png b/_main_files/figure-html/out-of-order-2-1.png
diff --git a/_main_files/figure-html/out-of-order-3-1.png b/_main_files/figure-html/out-of-order-3-1.png
diff --git a/_main_files/figure-html/pen-tool-01-1.png b/_main_files/figure-html/pen-tool-01-1.png
diff --git a/_main_files/figure-html/pen-tool-02-1.png b/_main_files/figure-html/pen-tool-02-1.png
diff --git a/_main_files/figure-html/pen-tool-03-1.png b/_main_files/figure-html/pen-tool-03-1.png
diff --git a/_main_files/figure-html/plot-sketches-1.png b/_main_files/figure-html/plot-sketches-1.png
diff --git a/_main_files/figure-html/rcolorbrewer-1.png b/_main_files/figure-html/rcolorbrewer-1.png
diff --git a/_main_files/figure-html/restart-kernel-run-all-1.png b/_main_files/figure-html/restart-kernel-run-all-1.png
diff --git a/_main_files/figure-html/rowwise-1.png b/_main_files/figure-html/rowwise-1.png
diff --git a/_main_files/figure-html/scatter-color-by-category-palette-1.png b/_main_files/figure-html/scatter-color-by-category-palette-1.png
diff --git a/_main_files/figure-html/summarize-1.png b/_main_files/figure-html/summarize-1.png
diff --git a/_main_files/figure-html/summarize-across-1.png b/_main_files/figure-html/summarize-across-1.png
diff --git a/_main_files/figure-html/summarize-groupby-1.png b/_main_files/figure-html/summarize-groupby-1.png
diff --git a/_main_files/figure-html/upload-files-01-1.png b/_main_files/figure-html/upload-files-01-1.png
diff --git a/_main_files/figure-html/upload-files-02-1.png b/_main_files/figure-html/upload-files-02-1.png
diff --git a/_main_files/figure-html/vc-ba2-add-1.png b/_main_files/figure-html/vc-ba2-add-1.png
diff --git a/_main_files/figure-html/vc-ba3-commit-1.png b/_main_files/figure-html/vc-ba3-commit-1.png
diff --git a/_main_files/figure-html/vc1-no-changes-1.png b/_main_files/figure-html/vc1-no-changes-1.png
diff --git a/_main_files/figure-html/vc2-changes-1.png b/_main_files/figure-html/vc2-changes-1.png
diff --git a/_main_files/figure-html/vc5-5-nachos-to-cheesecake-1.png b/_main_files/figure-html/vc5-5-nachos-to-cheesecake-1.png
diff --git a/_main_files/figure-html/vc5-push-1.png b/_main_files/figure-html/vc5-push-1.png
diff --git a/_main_files/figure-html/vc6-remote-changes-1.png b/_main_files/figure-html/vc6-remote-changes-1.png
diff --git a/_main_files/figure-html/vc7-pull-1.png b/_main_files/figure-html/vc7-pull-1.png
diff --git a/about-the-authors.html b/about-the-authors.html
diff --git a/acknowledgments.html b/acknowledgments.html
diff --git a/appendixA.html b/appendixA.html
diff --git a/classification1.html b/classification1.html
diff --git a/classification2.html b/classification2.html
diff --git a/clustering.html b/clustering.html
diff --git a/foreword.html b/foreword.html
diff --git a/getting-started-with-jupyter.html b/getting-started-with-jupyter.html
diff --git a/img/ML-paradigm-test.png b/img/ML-paradigm-test.png
diff --git a/img/authorize_question.png b/img/authorize_question.png
diff --git a/img/chapter_overview.jpeg b/img/chapter_overview.jpeg
diff --git a/img/craigslist_human.png b/img/craigslist_human.png
diff --git a/img/cv.png b/img/cv.png
diff --git a/img/ds-a-first-intro-cover.jpg b/img/ds-a-first-intro-cover.jpg
diff --git a/img/ds-a-first-intro-graphic.jpg b/img/ds-a-first-intro-graphic.jpg
diff --git a/img/ds-a-first-intro-graphic.png b/img/ds-a-first-intro-graphic.png
diff --git a/img/ds-first-intro-cover.png b/img/ds-first-intro-cover.png
diff --git a/img/filesystem.jpeg b/img/filesystem.jpeg
diff --git a/img/gentoo.jpg b/img/gentoo.jpg
diff --git a/img/help-filter.png b/img/help-filter.png
diff --git a/img/intro-bootstrap.jpeg b/img/intro-bootstrap.jpeg
diff --git a/img/jupyter.png b/img/jupyter.png
diff --git a/img/pivot_functions/pivot_functions.001.jpeg b/img/pivot_functions/pivot_functions.001.jpeg
diff --git a/img/pivot_functions/pivot_functions.002.jpeg b/img/pivot_functions/pivot_functions.002.jpeg
diff --git a/img/pivot_functions/pivot_functions.003.jpeg b/img/pivot_functions/pivot_functions.003.jpeg
diff --git a/img/pivot_functions/pivot_functions.004.jpeg b/img/pivot_functions/pivot_functions.004.jpeg
diff --git a/img/png-vs-svg.png b/img/png-vs-svg.png
diff --git a/img/population_vs_sample.png b/img/population_vs_sample.png
diff --git a/img/sg1.png b/img/sg1.png
diff --git a/img/sg2.png b/img/sg2.png
diff --git a/img/sg3.png b/img/sg3.png
diff --git a/img/sg4.png b/img/sg4.png
diff --git a/img/spreadsheet_vs_dataframe.PNG b/img/spreadsheet_vs_dataframe.PNG
diff --git a/img/tidyverse_twitter.png b/img/tidyverse_twitter.png
diff --git a/img/train-test-overview.jpeg b/img/train-test-overview.jpeg
diff --git a/img/training_test.jpeg b/img/training_test.jpeg
diff --git a/index.html b/index.html
diff --git a/inference.html b/inference.html
diff --git a/intro.html b/intro.html
diff --git a/libs/anchor-sections-1.0.1/anchor-sections.css b/libs/anchor-sections-1.0.1/anchor-sections.css
@@ -0,0 +1,5 @@
+/* Styles for section anchors */
+a.anchor-section {margin-left: 10px; visibility: hidden; color: inherit;}
+a.anchor-section::before {content: '#';}
+.hasAnchor:hover a.anchor-section {visibility: visible;}
+ul > li > .anchor-section {display: none;}
diff --git a/libs/anchor-sections-1.0.1/anchor-sections.js b/libs/anchor-sections-1.0.1/anchor-sections.js
@@ -0,0 +1,33 @@
+// Anchor sections v1.0 written by Atsushi Yasumoto on Oct 3rd, 2020.
+document.addEventListener('DOMContentLoaded', function() {
+  // Do nothing if AnchorJS is used
+  if (typeof window.anchors === 'object' && anchors.hasOwnProperty('hasAnchorJSLink')) {
+    return;
+  }
+
+  const h = document.querySelectorAll('h1, h2, h3, h4, h5, h6');
+
+  // Do nothing if sections are already anchored
+  if (Array.from(h).some(x => x.classList.contains('hasAnchor'))) {
+    return null;
+  }
+
+  // Use section id when pandoc runs with --section-divs
+  const section_id = function(x) {
+    return ((x.classList.contains('section') || (x.tagName === 'SECTION'))
+            ? x.id : '');
+  };
+
+  // Add anchors
+  h.forEach(function(x) {
+    const id = x.id || section_id(x.parentElement);
+    if (id === '' || x.matches(':empty')) {
+      return null;
+    }
+    let anchor = document.createElement('a');
+    anchor.href = '#' + id;
+    anchor.classList = ['anchor-section'];
+    x.classList.add('hasAnchor');
+    x.appendChild(anchor);
+  });
+});
diff --git a/libs/crosstalk-1.1.1/css/crosstalk.css b/libs/crosstalk-1.1.1/css/crosstalk.css
@@ -0,0 +1,27 @@
+/* Adjust margins outwards, so column contents line up with the edges of the
+   parent of container-fluid. */
+.container-fluid.crosstalk-bscols {
+  margin-left: -30px;
+  margin-right: -30px;
+  white-space: normal;
+}
+
+/* But don't adjust the margins outwards if we're directly under the body,
+   i.e. we were the top-level of something at the console. */
+body > .container-fluid.crosstalk-bscols {
+  margin-left: auto;
+  margin-right: auto;
+}
+
+.crosstalk-input-checkboxgroup .crosstalk-options-group .crosstalk-options-column {
+  display: inline-block;
+  padding-right: 12px;
+  vertical-align: top;
+}
+
+@media only screen and (max-width:480px) {
+  .crosstalk-input-checkboxgroup .crosstalk-options-group .crosstalk-options-column {
+    display: block;
+    padding-right: inherit;
+  }
+}
diff --git a/libs/crosstalk-1.1.1/js/crosstalk.min.js b/libs/crosstalk-1.1.1/js/crosstalk.min.js
diff --git a/libs/gitbook-2.6.7/css/fontawesome/fontawesome-webfont.ttf b/libs/gitbook-2.6.7/css/fontawesome/fontawesome-webfont.ttf
diff --git a/libs/gitbook-2.6.7/css/plugin-bookdown.css b/libs/gitbook-2.6.7/css/plugin-bookdown.css
@@ -0,0 +1,105 @@
+.book .book-header h1 {
+  padding-left: 20px;
+  padding-right: 20px;
+}
+.book .book-header.fixed {
+  position: fixed;
+  right: 0;
+  top: 0;
+  left: 0;
+  border-bottom: 1px solid rgba(0,0,0,.07);
+}
+span.search-highlight {
+  background-color: #ffff88;
+}
+@media (min-width: 600px) {
+  .book.with-summary .book-header.fixed {
+    left: 300px;
+  }
+}
+@media (max-width: 1240px) {
+  .book .book-body.fixed {
+    top: 50px;
+  }
+  .book .book-body.fixed .body-inner {
+    top: auto;
+  }
+}
+@media (max-width: 600px) {
+  .book.with-summary .book-header.fixed {
+    left: calc(100% - 60px);
+    min-width: 300px;
+  }
+  .book.with-summary .book-body {
+    transform: none;
+    left: calc(100% - 60px);
+    min-width: 300px;
+  }
+  .book .book-body.fixed {
+    top: 0;
+  }
+}
+
+.book .book-body.fixed .body-inner {
+  top: 50px;
+}
+.book .book-body .page-wrapper .page-inner section.normal sub, .book .book-body .page-wrapper .page-inner section.normal sup {
+  font-size: 85%;
+}
+
+@media print {
+  .book .book-summary, .book .book-body .book-header, .fa {
+    display: none !important;
+  }
+  .book .book-body.fixed {
+    left: 0px;
+  }
+  .book .book-body,.book .book-body .body-inner, .book.with-summary {
+    overflow: visible !important;
+  }
+}
+.kable_wrapper {
+  border-spacing: 20px 0;
+  border-collapse: separate;
+  border: none;
+  margin: auto;
+}
+.kable_wrapper > tbody > tr > td {
+  vertical-align: top;
+}
+.book .book-body .page-wrapper .page-inner section.normal table tr.header {
+  border-top-width: 2px;
+}
+.book .book-body .page-wrapper .page-inner section.normal table tr:last-child td {
+  border-bottom-width: 2px;
+}
+.book .book-body .page-wrapper .page-inner section.normal table td, .book .book-body .page-wrapper .page-inner section.normal table th {
+  border-left: none;
+  border-right: none;
+}
+.book .book-body .page-wrapper .page-inner section.normal table.kable_wrapper > tbody > tr, .book .book-body .page-wrapper .page-inner section.normal table.kable_wrapper > tbody > tr > td {
+  border-top: none;
+}
+.book .book-body .page-wrapper .page-inner section.normal table.kable_wrapper > tbody > tr:last-child > td {
+    border-bottom: none;
+}
+
+div.theorem, div.lemma, div.corollary, div.proposition, div.conjecture {
+  font-style: italic;
+}
+span.theorem, span.lemma, span.corollary, span.proposition, span.conjecture {
+  font-style: normal;
+}
+div.proof>*:last-child:after {
+  content: "\25a2";
+  float: right;
+}
+.header-section-number {
+  padding-right: .5em;
+}
+#header .multi-author {
+  margin: 0.5em 0 -0.5em 0;
+}
+#header .date {
+  margin-top: 1.5em;
+}
diff --git a/libs/gitbook-2.6.7/css/plugin-clipboard.css b/libs/gitbook-2.6.7/css/plugin-clipboard.css
@@ -0,0 +1,18 @@
+div.sourceCode {
+  position: relative;
+}
+
+.copy-to-clipboard-button {
+  position: absolute;
+  right: 0;
+  top: 0;
+  visibility: hidden;
+}
+
+.copy-to-clipboard-button:focus {
+  outline: 0;
+}
+
+div.sourceCode:hover > .copy-to-clipboard-button {
+  visibility: visible;
+}