PHP Classes

PHP NGram Predictor: Predict the next characters based on the previous

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Description 

Author

JImmy Bo

This package can predict the following characters based on the previous ones.

It can be trained with sentences with valid words to learn the most common words users may type when asking questions.

The package can parse a sequence of characters a user may have typed and predict the following letters based on what it learned during the training phase.

It uses an N-Gram model, where the probability of each character is calculated based on the previous N characters.

The class includes methods for converting text to integers, creating a dictionary of character sequences, finding the previous(todo) and following characters based on a given sequence, and predicting the most likely next character based on a given sequence.

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Example

<?php
    // example of using the NGramPredictor class
    // shows:
    // 1. how to train the predictor
    // 2. how to predict the next character
    // 3. how to get all matches for a given string
    // 4. how to get the next character for a given string
    // 5. how to get the previous character for a given string (TODO)
   

    require_once("class.npredict.php");

    $predictor = new NGramPredictor(2);
    $predictor->train("Hello my name is Fred and I like to enjoy life. Life is one hell of a ride. Likewise, naturally, I like to jump. Martha helped the donkey open the gate while tying her shoe.");

    $str = "el";
    for ($i = 0; $i < 10; $i++) {
        $char = $predictor->predict($str);
        $str .= $char;
        print("c:".$char."<br />\n");
        print("s:".$str."<br />\n");
    }

    echo "\r\n<br /><br />";

    $match_str = "el";
    print("match_str:".$match_str."<br />\n");
    // now show the matching dict for the matches
    foreach ($predictor->predict_get_all_matches($match_str) as $key => $val) {
        // decode key
        $decoded = $predictor->decode([$key]);
        print("key:".$key." val:".$val." decoded:".$decoded."<br />\n");
    }


    /*
    Output:
        c:l
        s:ell
        c:o
        s:ello
        c:
        s:ello
        c:m
        s:ello m
        c:y
        s:ello my
        c:
        s:ello my
        c:n
        s:ello my n
        c:a
        s:ello my na
        c:m
        s:ello my nam
        c:e
        s:ello my name


        match_str:el
        key:2 val:2 decoded:l
        key:25 val:1 decoded:p
    */
?>

  Files folder image Files (2)  
File Role Description
Plain text file class.npredict.php Class PHP Class for N-Gram Prediction
Accessible without login Plain text file example.npredict.php Example example of using the NGramPredictor class

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