Various updates (Bootstrap 3.4.1, lts-12.26 for Stack), small refactors

drafts/2017-04-20-modularity.org

@@ -281,3 +281,14 @@ https://github.com/stevemao/left-pad/issues/4
 - https://twitter.com/fchollet/status/962074070513631232
 
 - How does this fit with /composition/? Does it?
+
+- [[https://mitpress.mit.edu/sites/default/files/sicp/full-text/book/book-Z-H-9.html#%25_chap_1][From SICP chapter 1 intro]]: "The acts of the mind, wherein it exerts
+  its power over simple ideas, are chiefly these three: 1. Combining
+  several simple ideas into one compound one, and thus all complex
+  ideas are made. 2. The second is bringing two ideas, whether simple
+  or complex, together, and setting them by one another so as to take
+  a view of them at once, without uniting them into one, by which it
+  gets all its ideas of relations. 3. The third is separating them
+  from all other ideas that accompany them in their real existence:
+  this is called abstraction, and thus all its general ideas are
+  made." -John Locke, An Essay Concerning Human Understanding (1690)

drafts/2018-04-08-recommender-systems-1-export.md

@@ -5,29 +5,29 @@
 
 # Table of Contents
 
-- [1. Introduction](#1.-Introduction)
-  - [1.1. Motivation](#1.1.-Motivation)
-  - [1.2. Organization](#1.2.-Organization)
-- [2. Dependencies & Setup](#2.-Dependencies-&-Setup)
-- [3. Loading data](#3.-Loading-data)
-  - [3.1. Aggregation](#3.1.-Aggregation)
-- [4. Utility Matrix](#4.-Utility-Matrix)
-- [5. Slope One Predictors](#5.-Slope-One-Predictors)
-  - [5.1. Weighted Slope One](#5.1.-Weighted-Slope-One)
-  - [5.2. Linear Algebra Tricks](#5.2.-Linear-Algebra-Tricks)
-  - [5.3. Implementation](#5.3.-Implementation)
-- [6. "SVD" algorithm](#6.-%22SVD%22-algorithm)
-  - [6.1. Model & Background](#6.1.-Model-&-Background)
-  - [6.2. Motivation](#6.2.-Motivation)
-  - [6.3. Prediction & Error Function](#6.3.-Prediction-&-Error-Function)
-  - [6.4. Gradients & Gradient Descent Updates](#6.4.-Gradients-&-Gradient-Descent-Updates)
-  - [6.5. Implementation](#6.5.-Implementation)
-  - [6.6. Running & Testing](#6.6.-Running-&-Testing)
-  - [6.7. Visualization of Latent Space](#6.7.-Visualization-of-Latent-Space)
-  - [6.8. Bias](#6.8.-Bias)
-- [7. Implementations in scikit-surprise](#7.-Implementations-in-scikit-surprise)
-- [8. Overall results](#8.-Overall-results)
-- [9. Further Work](#9.-Further-Work)
+- [1. Introduction](#introduction)
+  - [1.1. Motivation](#motivation)
+  - [1.2. Organization](#organization)
+- [2. Dependencies & Setup](#dependencies-setup)
+- [3. Loading data](#loading-data)
+  - [3.1. Aggregation](#aggregation)
+- [4. Utility Matrix](#utility-matrix)
+- [5. Slope One Predictors](#slope-one-predictors)
+  - [5.1. Weighted Slope One](#weighted-slope-one)
+  - [5.2. Linear Algebra Tricks](#linear-algebra-tricks)
+  - [5.3. Implementation](#implementation)
+- [6. "SVD" algorithm](#svd-algorithm)
+  - [6.1. Model & Background](#model-background)
+  - [6.2. Motivation](#motivation)
+  - [6.3. Prediction & Error Function](#prediction-error-function)
+  - [6.4. Gradients & Gradient Descent Updates](#gradients-gradient-descent-updates)
+  - [6.5. Implementation](#implementation-1)
+  - [6.6. Running & Testing](#running-testing)
+  - [6.7. Visualization of Latent Space](#visualization-of-latent-space)
+  - [6.8. Bias](#bias)
+- [7. Implementations in scikit-surprise](#implementations-in-scikit-surprise)
+- [8. Overall results](#overall-results)
+- [9. Further Work](#further-work)
 
 # 1. Introduction