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diff --git a/posts/2013-04-01-download_weather.html b/posts/2013-04-01-download_weather.html
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@@ -309,10 +309,9 @@ <h1 class="title">Downloading weather data</h1>
 <div id="cell-22" class="cell" data-execution_count="23">
 <div class="sourceCode cell-code" id="cb20"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb20-1"><a href="#cb20-1" aria-hidden="true" tabindex="-1"></a>df.head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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@@ -352,18 +351,16 @@ <h1 class="title">Downloading weather data</h1>
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 <p>Now, we need to fix the timezone.</p>
 <div id="cell-24" class="cell" data-execution_count="24">
 <div class="sourceCode cell-code" id="cb21"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb21-1"><a href="#cb21-1" aria-hidden="true" tabindex="-1"></a>df <span class="op">=</span> df.tz_localize(<span class="st">"Asia/Kolkata"</span>).tz_convert(<span class="st">"US/Central"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <div id="cell-25" class="cell" data-execution_count="25">
 <div class="sourceCode cell-code" id="cb22"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb22-1"><a href="#cb22-1" aria-hidden="true" tabindex="-1"></a>df.head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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@@ -403,7 +400,6 @@ <h1 class="title">Downloading weather data</h1>
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 <p>I’ll now export this file to a CSV to use it for following demonstrations on aggregations on time series.</p>
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 <div class="sourceCode cell-code" id="cb23"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb23-1"><a href="#cb23-1" aria-hidden="true" tabindex="-1"></a>df.to_csv(<span class="st">"weather.csv"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>

diff --git a/posts/2013-05-01-aggregation-timeseries.html b/posts/2013-05-01-aggregation-timeseries.html
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@@ -212,9 +212,8 @@ <h2 id="toc-title">On this page</h2>
 <div class="sourceCode cell-code" id="cb3"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>df.head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <section id="question-1-what-is-the-mean-temperature-and-humidity-per-hour-of-the-day" class="level3">
 <h3 class="anchored" data-anchor-id="question-1-what-is-the-mean-temperature-and-humidity-per-hour-of-the-day">Question 1: What is the mean temperature and humidity per hour of the day?</h3>
 <p>We’ll create a new column in the df containing the hour information from the index.</p>
@@ -265,9 +263,8 @@ <h3 class="anchored" data-anchor-id="question-1-what-is-the-mean-temperature-and
 <div class="sourceCode cell-code" id="cb5"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a>df.head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <div class="sourceCode cell-code" id="cb6"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a>mean_temp_humidity <span class="op">=</span> df.groupby(<span class="st">"hour"</span>).mean()</span>
 <span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a>mean_temp_humidity.head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <div class="sourceCode cell-code" id="cb7"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a>mean_temp_humidity.plot(subplots<span class="op">=</span><span class="va">True</span>)<span class="op">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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@@ -385,9 +379,8 @@ <h3 class="anchored" data-anchor-id="question-1-what-is-the-mean-temperature-and
 <div class="sourceCode cell-code" id="cb9"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a>mean_temp_humidity_pivoting.head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <p>By default the aggregation function used in pivoting is mean.</p>
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 <div class="sourceCode cell-code" id="cb11"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a>df.head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <div class="sourceCode cell-code" id="cb12"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a>daily_temp <span class="op">=</span> pd.pivot_table(df, index<span class="op">=</span>[<span class="st">"hour"</span>], columns<span class="op">=</span>[<span class="st">"day"</span>], values<span class="op">=</span>[<span class="st">"temperature"</span>])</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <div class="sourceCode cell-code" id="cb13"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a>daily_temp.head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <span id="cb14-2"><a href="#cb14-2" aria-hidden="true" tabindex="-1"></a>plt.ylabel(<span class="st">"Temp"</span>)<span class="op">;</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>

diff --git a/posts/2013-06-01-hmm_simulate.html b/posts/2013-06-01-hmm_simulate.html
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diff --git a/posts/2014-07-01-mcmc_coins.html b/posts/2014-07-01-mcmc_coins.html
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diff --git a/posts/2017-04-19-nmf-out-matrix.html b/posts/2017-04-19-nmf-out-matrix.html
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@@ -272,9 +272,8 @@ <h4 class="anchored" data-anchor-id="defining-matrix-a">Defining matrix A</h4>
 <span id="cb1-8"><a href="#cb1-8" aria-hidden="true" tabindex="-1"></a>pd.DataFrame(A_orig).head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a>A_df.head()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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 <h4 class="anchored" data-anchor-id="defining-matrices-w-and-h-learning-on-m-1-users-and-n-movies">Defining matrices W and H (learning on M-1 users and N movies)</h4>
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