Function identity

nodedb-codec/src/vector_quant/opq.rs:182–188

Return a dim×dim row-major identity matrix.

(dim: usize)

/// Return a dim×dim row-major identity matrix.
fn identity(dim: usize) -> Vec<f32> {
    let mut mat = vec![0.0f32; dim * dim];
    for i in 0..dim {
        mat[i * dim + i] = 1.0;
    }
    mat
}

/// Dequantize PQ codes into a reconstructed vector in rotated space.
fn dequantize_codes(codes: &[u8], codebooks: &[Vec<Vec<f32>>]) -> Vec<f32> {