How to populate sample in php machine learning library

Question

$samples = [[0], [5], [10], [20], [25], [18], [30]];
$labels = ['fail', 'fail', 'pass', 'pass'];

$classifier = new NaiveBayes();
$classifier->train($samples, $labels);

echo $classifier->predict([14]);

The above code is from php machine library named php ml. The sample and label are hardcoded in the above code. What i want to do is fill the $sample array from database. But the problem i am seeing is i cannot figure it out as you can see its $sample = [[],[],[]] . Is it array with in an array? And how to populate it

I have populated the $label successfully from db.

@Joseph_J you are right joseph. But that's not my question i want to populate samples from database. And what do we call $sample = [ [ ], [ ] ] why the double brackets are used? Is it getting array with in array or something i am missing in php? — Husnain, Nov 07 '18 at 09:34
Lets see your code for your queries including the fetches for your samples. — Joseph_J, Nov 07 '18 at 09:42
Yes, it's an array in an array. The reason why each sample value is an array is so that multiple values can be passed each data point, so more than one value can be evaluated & trained, in parallel. See Multiple Linear Regression for more info on this concept. — FredTheWebGuy, Jan 20 '19 at 18:08

score 0 · Answer 1 · answered Nov 07 '18 at 09:45

0

$samples = [[0], [5], [10], [20], [25], [18], [30]];

This seems like $samples is an array that contains sub-arrays for each of the sample 0, 5, 10 etc. According to the NaiveBayes for PHP, the sample paramter expects array.

answered Nov 07 '18 at 09:45

Osama Ibrahim

148
10

score 0 · Answer 2 · answered Nov 07 '18 at 10:17

You can use recursive iteration to flatten your array. This will work for you based on your example data.

On another note, I would try to manipulate your query to provide you the results in the proper format.

This solution creates an unnecessary tax on your resources having to iterate across your array, which I am assuming is going to be fairly large, when a proper query will eliminate the need for this altogether.

Try this:

$samples = [[0], [5], [10], [20], [25], [18], [30]];
$labels = ['fail', 'fail', 'pass', 'pass'];

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($samples));
$results = iterator_to_array($iterator, false);

echo '<pre>';
print_r($results);
print_r($labels);
echo '</pre>';

This will output:

Sample:

Array
(
    [0] => 0
    [1] => 5
    [2] => 10
    [3] => 20
    [4] => 25
    [5] => 18
    [6] => 30
)

Labels

Array
(
    [0] => fail
    [1] => fail
    [2] => pass
    [3] => pass
)

Good luck!

score 0 · Accepted Answer · answered Nov 07 '18 at 10:50

0

That is how we can accomplish it. Thank you everyone

 while($row = mysqli_fetch_assoc($result)){

        array_push($samples, array($row['result_midterm']));
    }

answered Nov 07 '18 at 10:50

Husnain

137
1
9

How to populate sample in php machine learning library

3 Answers3