Mismatch between DeepStack visual embeds ({}) and mask posit

Error message

Mismatch between DeepStack visual embeds ({}) and mask positions ({})

What it means

Thrown when the number of DeepStack visual embeddings does not match the number of positions flagged in the attention mask for insertion.

Source

Thrown at candle-transformers/src/models/qwen3_vl/text.rs:367

        let mask = visual_pos_masks.to_device(device)?.to_dtype(DType::F32)?;
        let mask_flat = mask.flatten_all()?;

        let masked_count = mask_flat.sum_all()?.to_scalar::<f32>()? as usize;
        let visual_embeds = visual_embeds.to_device(device)?.to_dtype(dtype)?;

        if masked_count == 0 {
            if visual_embeds.dim(0)? != 0 {
                candle::bail!(
                    "DeepStack visual embeds ({}) provided but mask is empty",
                    visual_embeds.dim(0)?
                );
            }
            return Ok(hidden_states);
        }

        if visual_embeds.dim(0)? != masked_count {
            candle::bail!(
                "Mismatch between DeepStack visual embeds ({}) and mask positions ({})",
                visual_embeds.dim(0)?,
                masked_count
            );
        }

        let (batch, seq, hidden) = hidden_states.dims3()?;
        let total_positions = batch * seq;
        let mut hidden_flat = hidden_states.reshape((total_positions, hidden))?;

        let prefix = mask_flat.cumsum(0)?;
        let rank = (prefix - &mask_flat)?.mul(&mask_flat)?;
        let rank_u32 = rank.to_dtype(DType::U32)?;

        let positions = Tensor::arange(0u32, total_positions as u32, device)?;
        let positions_f32 = positions.to_dtype(DType::F32)?;
        let masked_positions = positions_f32.mul(&mask_flat)?;

View on GitHub (pinned to d5fee525bf)

When it happens

Trigger: Thrown at candle-transformers/src/models/qwen3_vl/text.rs:367 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of huggingface/candle@d5fee525bf (2026-09-02). Data as JSON: /api/errors/9ff16fb1465b14d2. Report an issue: GitHub.