index.json

{
  "title": "Bayesian Text Classification",
  "description": "In this coding challenge, I struggle my way through implementing a Naive Bayes text classifier in JavaScript using p5.js. I explain Bayes' theorem, demonstrate word frequency analysis, implement Laplacian smoothing, and build a working sentiment classifier that runs entirely in the browser.",
  "videoNumber": "187",
  "videoId": "g3-PXyF8U70",
  "date": "2025-10-11",
  "nebulaSlug": "codingtrain-coding-challenge-187-bayes-classifier",
  "languages": ["JavaScript", "p5.js"],
  "topics": [
    "Bayes theorem",
    "text classification",
    "naive Bayes",
    "sentiment analysis",
    "natural language processing",
    "machine learning",
    "word frequency",
    "Laplacian smoothing"
  ],
  "canContribute": true,
  "relatedChallenges": ["40-word-counter", "42-markov-chain-name-generator"],
  "timestamps": [
    { "time": "0:00:00", "title": "Hello!" },
    { "time": "0:03:34", "title": "Explaining Bayes' Theorem" },
    { "time": "0:12:07", "title": "What is Naive Bayes?" },
    { "time": "0:13:49", "title": "Setting up the Classifier in p5.js" },
    { "time": "0:15:41", "title": "Coding the train() function " },
    { "time": "0:22:14", "title": "Coding the classify() Function" },
    { "time": "0:24:45", "title": "Revising the train() function" },
    { "time": "0:29:06", "title": "Implementing Probability Calculations" },
    { "time": "0:33:24", "title": "Laplacian (Additive) Smoothing" },
    { "time": "0:42:21", "title": "Ignoring the enominator (Normalization)" },
    { "time": "0:45:36", "title": "Quick User Interface" },
    { "time": "0:49:42", "title": "Final thoughts and next steps." }
  ],
  "codeExamples": [
    {
      "title": "Text Classifier - Initial Version",
      "description": "Raw (but corrected) version in p5.js web editor.",
      "image": "classify.png",
      "urls": {
        "p5": "https://editor.p5js.org/codingtrain/sketches/RZ8a1z4DN"
      }
    },
    {
      "title": "Text Classifier - Refactored Version",
      "image": "classify.png",
      "description": "Refactored version with better structure and comments.",
      "urls": {
        "p5": "https://editor.p5js.org/codingtrain/sketches/P3ngrAANX",
        "other": "https://github.com/Programming-from-A-to-Z/bayes-classifier-js"
      }
    },
    {
      "title": "Text Classifier - File Loading Version",
      "description": "Version that loads training data from three novels (romance, horror, sci-fi).",
      "image": "classifyfiles.png",
      "urls": {
        "p5": "https://editor.p5js.org/codingtrain/sketches/WowR2Q9xg"
      }
    }
  ],
  "groupLinks": [
    {
      "title": "References",
      "links": [
        {
          "icon": "📓",
          "title": "Naive Bayes Classifier",
          "url": "https://en.wikipedia.org/wiki/Naive_Bayes_classifier",
          "description": "Wikipedia article explaining naive Bayes classification algorithms."
        },
        {
          "icon": "📓",
          "title": "Laplacian Smoothing",
          "url": "https://en.wikipedia.org/wiki/Additive_smoothing",
          "description": "Wikipedia article about additive (Laplacian) smoothing technique."
        }
      ]
    },
    {
      "title": "Videos",
      "links": [
        {
          "icon": "🚂",
          "title": "Word Counting",
          "url": "/challenges/40-word-counter",
          "description": "Video series on text analysis and word counting fundamentals."
        },
        {
          "icon": "🚂",
          "title": "Regular Expressions",
          "url": "https://youtu.be/7DG3kCDx53c?list=PLRqwX-V7Uu6YEypLuls7iidwHMdCM6o2w",
          "description": "Video series covering regular expressions for text processing."
        },
        {
          "icon": "📺",
          "title": "Bayes theorem, the geometry of changing beliefs",
          "url": "https://youtu.be/HZGCoVF3YvM",
          "description": "Visual explanation of Bayes' theorem with geometric visualization from 3Blue1Brown."
        },
        {
          "icon": "🚂",
          "title": "p5.js 2.0: async and await",
          "url": "/tracks/p5js-2.0/p5js-2.0/async-await",
          "description": "Asynchronous programming in p5.js using async and await."
        }
      ]
    },
    {
      "title": "Live Stream Archives",
      "links": [
        {
          "icon": "🔴",
          "title": "Full Live Stream",
          "url": "https://youtube.com/live/TsBDm0P0qaA",
          "description": "Complete unedited live stream showing the development process with all mistakes and problem-solving."
        }
      ]
    }
  ],
  "credits": [
    { "title": "Editing", "name": "Mathieu Blanchette" },
    { "title": "Animations", "name": "Jason Heglund" }
  ]
}