Simple method for reading image (w. ImageSharp)

[dayo05]

Tensor ReadImage(string image)
{
    var img = Image.Load<Rgb24>(image, new JpegDecoder());
    return cat(new[] {ReadImageChannel(img, "R"), ReadImageChannel(img, "G"), ReadImageChannel(img, "B")}, 0).unsqueeze(0);
}


private Tensor ReadImageChannel(Image<Rgb24> image, string channel)
=> tensor(image.GetPixelMemoryGroup()[0].Span.ToArray().Select(x => channel switch
{
    "R" => x.R,
    "G" => x.G,
    "B" => x.B,
    _ => throw new InvalidEnumArgumentException("not defined channel")} / 255.0f).ToList(),
    new long[]{1, image.Width, image.Height});
}

Just call ReadImage(path to image)