HyperCLOVAX-SEED-Think-DeepConf-14B

Model Card for sigridjineth/HyperCLOVAX-SEED-Think-DeepConf-14B

Summary

This model enhances a user-forked version of HyperCLOVAX-SEED-Think-14B by integrating ideas from Meta AI × UCSD's DeepConf. It performs confidence-based quality estimation and adaptive sampling to improve both accuracy and efficiency.

The core of this method is the Lowest Group Confidence (LGC), a metric that uses a sliding window to identify the "most uncertain segment" of a generation path. This allows for intelligent offline filtering (Top-p% Filtering, Confidence-Weighted Voting) and online optimization (Early Abort), ultimately achieving higher accuracy at a lower computational cost.

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1. Background and Motivation

While Self-Consistency—generating multiple paths and taking a majority vote—can improve performance on reasoning tasks, its practical application is limited by prohibitive computational costs and the noise introduced by low-quality generation paths.

The DeepConf framework addresses this by reading the model's internal token generation probability distribution (confidence) to estimate the quality of a path in real time. Simple average confidence can be misleading due to the "pitfall of averages." We instead use the sliding-window LGC metric to quantify the path's weakest link.

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2. Methods

2.1 Confidence Metric: Lowest Group Confidence (LGC)

LGC is calculated by moving a window of size $W$ (e.g., 2048 tokens) across the entire generation path, calculating the average confidence within each window, and taking the minimum value as the quality score for the entire trajectory.

• Intuition: The quality of a path is limited by its most uncertain or speculative segment.

The formula is: $$\text{LGC}(\text{trajectory}) = \min_{t} \frac{1}{W}\sum_{i=t}^{t+W-1} \text{conf}(y_i)$$

Here, $\text{conf}(y_i)$ is the generation probability of token $y_i$. Our implementation defaults to using the softmax probability of the top-1 token.

2.2 Offline Methods: Top-p% Filtering & Confidence-Weighted Voting

• Top-p% Filtering: Among $N$ generated paths, only the top p% with the highest confidence scores are included in the final vote.
• Confidence-Weighted Voting: Each path's vote is weighted by a function of its confidence score (e.g., its LGC score or a monotonic transformation of it).
• Literature Example: For a GPT-family model on AIME-2025, using only the top 10% of 512 samples reportedly improved accuracy from 97.0% to 99.9%. (Note: This is a literature example; this model's specific results are detailed below.)

2.3 Online Method: Adaptive Sampling (Early Abort)

1. Warm-up: Fully generate $M$ initial paths (e.g., 16) to establish a dynamic confidence threshold, $\tau$.
2. Monitoring: For each new path, if its real-time LGC drops below $\tau$ at any point, the generation is immediately aborted and discarded, preventing wasted computation on low-quality paths.

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• Reported Gains: This technique can reduce the number of sampled tokens by ~85% while maintaining or even improving accuracy.

2.4 HyperCLOVAX (Think/Answer) Specialization

We leverage the model's ChatML structure, which separates the thinking (exploration) and answer (formal response) stages, by applying a dual-threshold system: $\tau_{\text{think}} < \tau_{\text{answer}}$.

• Thinking Stage: A looser threshold encourages broader exploration of ideas.
• Answer Stage: A stricter threshold enforces high confidence, ensuring formal correctness and accuracy in the final output.

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3. Hyperparameters (Recommended Defaults)

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4. Evaluation

4.1 AIME 2025 (30-question slice) — deepconf vs. original

Scoring: Correct = 1, Incorrect / No Format = 0. "No Format" is treated as not attempted.

Breakdown by Part:

• Part I: Both models solved 6/15 questions (Tie).
• Part II: original solved 2/15, while deepconf solved 4/15. The performance gain was concentrated in the more difficult second half.

Note: The high number of "Format Failures" in this slice indicates that the ability to adhere to strict output formatting was a significant factor in the final score.

4.2 Efficiency & Speed (10-question sample test)

Caution: These results are based on a very small sample size (N≈10). However, they signal a meaningful improvement across accuracy, speed, and cost.

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5. Use Cases and Recommended Pipeline

This model is ideal for mathematical and logical reasoning tasks where it offers significant sample savings and improved reliability compared to standard self-consistency.

Recommended Pipeline:

1. Online: Use adaptive sampling with a warm-up phase and early abort to filter out low-quality paths efficiently.
2. Offline: Apply Top-p% Filtering (with p=10 as a starting point) to the remaining high-quality paths.
3. Finalization: Use Confidence-Weighted Voting on the filtered set and apply a final format validation step to extract the answer.

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6. Limitations & What to Watch Out For

• Confidence Miscalibration: If the model's probability estimates are not well-calibrated, the threshold $\tau$ may be unreliable. This can be mitigated by tuning temperature/top-k or relying on warm-up statistics.
• Domain Shift: The optimal hyperparameters ($\tau, W, p$) may need recalibration when applied to new domains or problem styles.
• Unintended Early Aborts: A path might be discarded prematurely if it contains rare tokens or formatting that cause a temporary dip in confidence. Consider implementing a minimum generation length or a cooldown period.
• Reliance on Format Validation: If the final answer extraction logic is not robust, "correct but badly formatted" answers may still be missed.

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7. Responsible Use

• Expose Reasoning: For math and coding tasks, always pair the final answer with the generation's reasoning or verification steps to mitigate hallucinations and minor errors.
• Resource Allocation: While early abort reduces overall cost, the warm-up phase introduces overhead. Manage this effectively with batching and queueing in a production environment.
• Bias and Fairness: Confidence-based filtering may systematically favor certain response styles. We recommend periodic auditing and sampling to ensure fairness and diversity in outputs.

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Citation

• Original Idea: Fu, Wang, Tian, Zhao et al., Deep Think With Confidence (Meta AI, UCSD)