how can input array from my database to new variable?

I have an array from postgresql array with structure like this ,laravel dd($samples):

array:4 [▼
  0 => array:1 [▼
    0 => "8"
  ]
  1 => array:1 [▼
    0 => "10"
  ]
  2 => array:1 [▼
    0 => "17"
  ]
  3 => array:3 [▼
    0 => "11"
    1 => "10"
    2 => "27"
  ]
]

and i try to test data ,input that array to php-ml library here the link https://php-ml.readthedocs.io/en/latest/machine-learning/association/apriori/

why it getting error "Undefined offset: 1" ?

this is error detail :

protected function compileForeach($expression)
{
    preg_match('/\( *(.*) +as *(.*)\)$/is', $expression, $matches);

    $iteratee = trim($matches[1]);

    $iteration = trim($matches[2]);

    $initLoop = "\$__currentLoopData = {$iteratee}; \$__env->addLoop(\$__currentLoopData);";

    $iterateLoop = '$__env->incrementLoopIndices(); $loop = $__env->getLastLoop();';

    return "<?php {$initLoop} foreach(\$__currentLoopData as {$iteration}): {$iterateLoop} ?>";
}

and this my controller :

<?php

namespace App\Http\Controllers;

use App\Product;
use App\Order;
use App\OrderProduct;
use App\OrderItemset;
use Phpml\Association\Apriori;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class AprioriController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {

    $data = OrderItemset::get('order_itemset');
    $obj = json_decode($data,true);

    $samples = array_column($obj, 'order_itemset');
    $samples = array_map(function ($v) {
        preg_match("/^\{(.+)\}$/", $v, $matches);
        if ($matches[1]) {
            return explode(',', $matches[1]);
        }
        return null;
    }, $samples);

    // dd($samples);

    $labels  = [];

    $associator = new Apriori($support = 0.2, $confidence = 0.7);
    $associator->train($samples, $labels);

    $associator->predict(['3']);

    $associator->apriori();

    $associator->apriori();

    //dd($associator);
    ]);

im newb, and and very grateful if someone helps me. sorry for my broken english. Thanks

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