fn transcode()

in crates/ratchet-loader/src/gguf/dtype.rs [87:124]

• 34 lines of code
• 2 McCabe index (conditional complexity)

    fn transcode(
        data: &[Self::GGUF_TYPE],
        n_blocks: usize,
        shape: Shape,
        device: &Device,
    ) -> anyhow::Result<Tensor> {
        //TODO: these should be uninit
        let mut qs_bytes = Vec::with_capacity(n_blocks * QK_K);
        let mut scales_bytes = Vec::with_capacity(n_blocks * K_SCALE_SIZE);
        let mut dmin_bytes = Vec::with_capacity(n_blocks * 2);
        let mut d_bytes = Vec::with_capacity(n_blocks * 2);

        for block in data {
            dmin_bytes.extend_from_slice(&block.dmin.to_le_bytes());
            d_bytes.extend_from_slice(&block.d.to_le_bytes());
            let block_qs = block.qs;
            qs_bytes.extend_from_slice(bytemuck::cast_slice(&block_qs));
            scales_bytes.extend_from_slice(bytemuck::cast_slice(&block.scales));
        }

        let _ = qs_bytes.pad_to_offset();
        let _ = scales_bytes.pad_to_offset();
        let _ = dmin_bytes.pad_to_offset();
        let _ = d_bytes.pad_to_offset();

        qs_bytes.append(&mut scales_bytes);
        qs_bytes.append(&mut dmin_bytes);
        qs_bytes.append(&mut d_bytes);
        let casted = bytemuck::cast_slice::<u8, u32>(&qs_bytes);
        unsafe {
            Ok(Tensor::from_quantized::<u32, _>(
                casted,
                DType::Q4_KH(Q4_KH::default()),
                shape,
                device.clone(),
            ))
        }
    }