Function generate 

pub fn generate(
    model: &dyn MIBackend,
    device: &Device,
    mask_token_id: u32,
    prompt_ids: &[u32],
    config: &DiffusionSamplingConfig,
) -> Result<Vec<u32>>

Generate one sequence by masked-diffusion ancestral sampling.

Returns the final token ids (length config.seq_len, no [MASK] left). prompt_ids is clamped to the prefix and carried over unchanged.

Errors

Returns MIError::Model on a forward-pass or tensor failure.