Function sign_unpack

nodedb-codec/src/vector_quant/rabitq.rs:102–112

Dequantize sign-packed bits back to ±1 values (for dot_quantized calc).

(packed: &[u8], dim: usize)

/// Dequantize sign-packed bits back to ±1 values (for dot_quantized calc).
fn sign_unpack(packed: &[u8], dim: usize) -> Vec<f32> {
    (0..dim)
        .map(|i| {
            if packed[i / 8] & (1 << (i % 8)) != 0 {
                -1.0f32
            } else {
                1.0f32
            }
        })
        .collect()
}

// ── RaBitQCodec ──────────────────────────────────────────────────────────────