Function streamed_image_of 

pub fn streamed_image_of(
    machine: &Layout,
    layout: &ImageLayout,
) -> Result<(Image, Vec<usize>), ImageError>

The weight image of the matrices machine’s matvec jobs stream, in its order and no other tensor, laid out under layout (in stripes when it has one), with each image tensor’s index in the machine’s: what the hybrid engine’s streaming matvec reads beside the flat space the reference engine reads the rest of the memory from.