diff --git a/docs/data.html b/docs/data.html
index 8017103..d028d84 100644
--- a/docs/data.html
+++ b/docs/data.html
@@ -361,8 +361,8 @@ <h2>Working Directory Setup</h2>
 your working directory, you place the unzipped <code>demo_data</code>
 directory. Also under your <code>Working_Directory</code> are all the
 notebook files you create for the tutorials and assignments.</p>
-<div class="grViz html-widget html-fill-item-overflow-hidden html-fill-item" id="htmlwidget-4a79157a8798bb93435d" style="width:672px;height:480px;"></div>
-<script type="application/json" data-for="htmlwidget-4a79157a8798bb93435d">{"x":{"diagram":"digraph {\n  \ngraph[layout = dot]\n\nnode[style=filled, color = grey90, penwidth = 0.3, fontcolor = grey30]\nedge[color= grey40, alpha = 0.2, penwidth= 0.4, arrowsize=0.8, arrowhead = normal]\n\na [label = \"Working_Directory\", shape = folder, fillcolor= \"#B0E2FC\"]\nb [label = \"demo_data\", shape = folder, fillcolor= \"#B0E2FC\"]\nc1 [label = \"script1.ipynb\", shape=file, fillcolor= \"#96F597\"]\nc2 [label = \"script1.ipynb\", shape=file, fillcolor= \"#96F597\"]\nc3 [label = \"...\", shape=file, fillcolor= \"#96F597\"]\nd1 [label = \"dataset1.csv\", shape = file, fillcolor=\"#96F597\"]\nd2 [label = \"dataset2.csv\", shape = file, fillcolor=\"#96F597\"]\nd3 [label = \"...\", shape = file, fillcolor=\"#96F597\"]\n\na -> {b, c1, c2, c3}\nb -> {d1,d2, d3}\n}","config":{"engine":"dot","options":null}},"evals":[],"jsHooks":[]}</script>
+<div class="grViz html-widget html-fill-item-overflow-hidden html-fill-item" id="htmlwidget-b4535f2e1d398b0ed1fc" style="width:672px;height:480px;"></div>
+<script type="application/json" data-for="htmlwidget-b4535f2e1d398b0ed1fc">{"x":{"diagram":"digraph {\n  \ngraph[layout = dot]\n\nnode[style=filled, color = grey90, penwidth = 0.3, fontcolor = grey30]\nedge[color= grey40, alpha = 0.2, penwidth= 0.4, arrowsize=0.8, arrowhead = normal]\n\na [label = \"Working_Directory\", shape = folder, fillcolor= \"#B0E2FC\"]\nb [label = \"demo_data\", shape = folder, fillcolor= \"#B0E2FC\"]\nc1 [label = \"script1.ipynb\", shape=file, fillcolor= \"#96F597\"]\nc2 [label = \"script1.ipynb\", shape=file, fillcolor= \"#96F597\"]\nc3 [label = \"...\", shape=file, fillcolor= \"#96F597\"]\nd1 [label = \"dataset1.csv\", shape = file, fillcolor=\"#96F597\"]\nd2 [label = \"dataset2.csv\", shape = file, fillcolor=\"#96F597\"]\nd3 [label = \"...\", shape = file, fillcolor=\"#96F597\"]\n\na -> {b, c1, c2, c3}\nb -> {d1,d2, d3}\n}","config":{"engine":"dot","options":null}},"evals":[],"jsHooks":[]}</script>
 <p>With the above file structure, if you want to access a particular
 file in the <code>demo_data</code> in your jupyter notebook, you may
 access it using the following path:</p>
diff --git a/docs/disclaimer.html b/docs/disclaimer.html
index c142736..0bd3807 100644
--- a/docs/disclaimer.html
+++ b/docs/disclaimer.html
@@ -388,7 +388,7 @@ <h2>Contacting me</h2>
 Disclaimer or wish to contact me concerning any matter relating to it,
 you may send an email to <a href="mailto:alvinchen@ntnu.edu.tw"
 class="email">alvinchen@ntnu.edu.tw</a></p>
-<p><strong>This document was last updated on 2023-12-24</strong></p>
+<p><strong>This document was last updated on 2024-02-08</strong></p>
 </div>
 
 
diff --git a/docs/index.html b/docs/index.html
index 13473a4..37e7566 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -338,7 +338,7 @@ <h1 class="title toc-ignore">ENC2045: Computational Linguistics</h1>
 </div>
 
 
-<p><em>This site is last-updated on 2023-12-24</em></p>
+<p><em>This site is last-updated on 2024-02-08</em></p>
 <hr />
 <div id="annoucements" class="section level1">
 <h1><svg viewBox="0 0 384 512" style="height:1em;position:relative;display:inline-block;top:.1em;fill:white;" xmlns="http://www.w3.org/2000/svg">
@@ -348,7 +348,7 @@ <h1><svg viewBox="0 0 384 512" style="height:1em;position:relative;display:inlin
 announced in class. You are responsible for all material that appears
 here and should check this page for updates frequently.</p>
 <ul>
-<li><strong>2023-12-24</strong>: The current version of the course
+<li><strong>2024-02-08</strong>: The current version of the course
 website is based on the Spring Semester, 2021. It will be updated when
 it is offered next time, which is, hopefully, the spring of 2023.</li>
 </ul>
@@ -519,7 +519,8 @@ <h1><svg viewBox="0 0 384 512" style="height:1em;position:relative;display:inlin
 2023-03-29
 </td>
 <td style="text-align:left;">
-Common NLP Tasks
+Common NLP Tasks (Guest Lecturer: Robin Lin from Droidtown Linguistic
+Tech. Co. Ltd. )
 </td>
 </tr>
 <tr>