Method to_bytes

nodedb-vector/src/quantize/pq.rs:210–221

Serialize the codec to bytes with a versioned magic header. Format: `[NDPQ\0\0 (6 bytes)][version: u8 = 1][msgpack payload]` Charges the estimated serialized size to the governor (if set) before allocating the output buffer. The estimate is conservative: `m * k * sub_dim * size_of:: () + 64` (header + framing overhead).

(&self)

    /// allocating the output buffer.  The estimate is conservative:
    /// `m * k * sub_dim * size_of::<f32>() + 64` (header + framing overhead).
    pub fn to_bytes(&self) -> Result<Vec<u8>, VectorError> {
        const MAGIC: &[u8; 6] = b"NDPQ\0\0";
        const VERSION: u8 = 1;
        let estimated = self.m * self.k * self.sub_dim * size_of::<f32>() + 64;
        let _g = try_reserve_or_skip(&self.governor, estimated)?;
        let payload = zerompk::to_msgpack_vec(self).unwrap_or_default();
        let mut out = Vec::with_capacity(7 + payload.len());
        out.extend_from_slice(MAGIC);
        out.push(VERSION);
        out.extend_from_slice(&payload);
        Ok(out)
    }

    /// Deserialize the codec from bytes produced by [`Self::to_bytes`].
    ///