changed titles to be larger

Author: pavelkomarov

taste_analysis.ipynb

@@ -505,7 +505,7 @@
     "\n",
     "That was fun.\n",
     "\n",
-    "### Release Dates\n",
+    "## Release Dates\n",
     "\n",
     "Which era of music do I prefer?"
    ]
@@ -638,7 +638,7 @@
    "source": [
     "Pretty good fit! I seem to be extra partial to music from about 5 years ago. We'll see whether the present or maybe the further past catches up.\n",
     "\n",
-    "### Popularity Contest\n",
+    "## Popularity Contest\n",
     "\n",
     "I was happy to find popularity listed as a field in Spotify's track JSON. It's a percentile between 0 and 100, rather than an absolute number of plays. Still, it can be used to give a notion of how hipster I am."
    ]
@@ -693,7 +693,7 @@
    "source": [
     "Damn, I'm a hipster.\n",
     "\n",
-    "### Track Duration\n",
+    "## Track Duration\n",
     "\n",
     "Do I prefer long songs or short ones?"
    ]
@@ -802,7 +802,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Musical Features\n",
+    "## Musical Features\n",
     "\n",
     "In the interest of understanding user tastes and providing the best possible music recommendations, Spotify has done [some really sophisticated analysis](http://benanne.github.io/2014/08/05/spotify-cnns.html) of actual track content, which has only gotten more extensive in recent years. Music is a time series, but most similarity metrics (and most ML methods generally) require inputs to be vectors, that is: points in some feature-space. So they've transformed the tracks to numerical metrics like Energy and Valence (continuous) and Key (discrete).\n",
     "\n",
@@ -1054,7 +1054,7 @@
     "\n",
     "So it looks like this category is for actual single beats and unusual time signatures that Spotify isn't sure what to do with.\n",
     "\n",
-    "### Joint Analysis\n",
+    "## Joint Analysis\n",
     "\n",
     "I mostly just want to showcase what's possible. Let's plot Energy and Popularity together to see whether there is a relationship."
    ]
@@ -1089,7 +1089,7 @@
    "source": [
     "The density is pretty scattered, doesn't  the whole plot, meaning the relationship here is actually pretty weak. Surprising.\n",
     "\n",
-    "### The Final Frontier\n",
+    "## The Final Frontier\n",
     "\n",
     "Finally, I'm going to follow [this guy's example](https://medium.com/cuepoint/visualizing-hundreds-of-my-favorite-songs-on-spotify-fe50c94b8af3) and feed the dimension-reduced data to a one-class SVM to get a sense of what the frontier of my normal taste looks like in that space, [heat-map-of-the-universe-style](https://www.nasa.gov/mission_pages/planck/multimedia/pia16873.html).\n",
     "\n",