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NDArray::inner

public static function inner(NDArray|array|float|int $a, NDArray|array|float|int $b): NDArray|float;

Calculates the inner product of two arrays. This operation involves multiplying corresponding elements of the arrays and summing them up.

  • When dealing with N-D arrays, the inner product is computed by taking a sum product over the last axes of the arrays.

Parameters​

$a $b​

Type NDArray|array|long|double

The arrays to perfom the inner product.

Return​

Type NDArray

  • If both $a and $b are scalars or 1-D arrays, the function will return a scalar value. Otherwise, if the input arrays have more than one dimension, an array will be returned.

Notes​

tip

GPU SUPPORTED​

This operation is supported by GPU (VRAM) and contains a custom CUDA kernel.

Examples​

use \NDArray as nd;

$a = nd::array([2, -2,   3]);
$b = nd::array([1, -1.5, 3]);

$result = nd::inner($a, $b);
print_r($result);
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