Web Project

Idea

Neural-net chatbot using brain.js
- Type of page: "Web toy"
- Target group: Techies

Modules

Diagram

Style

Page looking like a command prompt/terminal.

Font:
- Size: 16
- Font: Consolas
Colors:
- Screen Text: 192, 192, 192
- Screen Background: 0, 0, 0
- Popup Text: 128, 0, 128
- Popup Background: 255, 255, 255

Documentation

How to use

Set up a database with a table named vocab, the table needs two fields, an auto incrementing field called id, and a varchar field called word.
Create a new file with the name db_cred.json in learny/_server/. Then paste the following in the file and fill in the credentials to your database.

{
	"host": "",
	"user": "",
	"password": "",
	"database": ""
}

Make sure to install the dependencies with npm install.
now you just need to run_node.bat to start the server. your connection should appear on the site.

By default main.js is set to connect to localhost, if you want to change that its at the top of the file.

Process

Most of my work went fairly smoothly and after about a week of working, the bot could learn from a dataset. However, things got harder when i started implementing the database. As of writing this the bot is in a somewhat broken state, most of the problems stem from having to reload the database when a new word is added to the vocabulary. I tried to fix the some of them by using callbacks, but to no avail. Because of this I now realize that this might not be a good use of databases.

I have made a couple of last minute fixes to make the bot a little bit less broken.

Validation

I got no errors on validator.nu
wave.webaim.org reported that the input element had no form label, which I fixed by adding a title attribute to it.

index.js

/* - Variables - */

const net // The neural net/bot, for more info see brain.js documentation.

var vocab // Array where vocabulary loaded from database is stored.


/* - Functions - */

/**
 * Loads vocabulary from database to vocab.
 */
loadVocab()

/**
 * Inserts a word into vocab database.
 */
insertVocab()

/**
 * Calls toData() on inputMessage and outputMessage and then trains the bot on the returned data. Returns a sample result after training.
 * @param {String} inputMessage input to train on
 * @param {String} outputMessage output to train on
 */
train(inputMessage, outputMessage)

/**
 * Calls toData() on inputMessage and then
 * @param {String} inputMessage
 */
generateReply(inputMessage)

/**
 * Splits inputString Converts inputString to data and returns inputData
 * @param {String} inputString String to be converted to data
 */
toData(inputString)


/**
 * Converts inputArray to a string and returns it.
 * @param {Array} inputArray 
 */
toWords(inputArray) 

/**
 * Gets vocabIndex of word, if word isn't in vocab, word gets inserted into vocab database. Returns vocabIndex.id of word.
 * As of right now it cannot return return a word id
 * @param {String} word Single word string.
 */
getWord(word) 

/**
 * Returns vocab index of id.
 */
getId(id)

DigitalMoleMan / learny