MIRA-QA-Group3

A student scorer from MIRA (Mid-training Rubric Anchoring for Source-Aware Data Selection), fine-tuned to score mathematical reasoning QA (with thinking traces) along a group-specific set of anchor rubric dimensions.

📄 Paper: MIRA: Mid-training Rubric Anchoring for Source-Aware Data Selection (EMNLP 2026) 💻 Code: https://github.com/Multilingual-Multimodal-NLP/mira


TL;DR

MIRA is a source-aware data selection framework for heterogeneous mid-training corpora. Instead of applying a single global quality rubric, MIRA (1) clusters sources into capability-coherent groups, (2) lets a frontier teacher (Kimi-K2.6) freely propose rubric dimensions and anchors them per group, (3) distills the anchored teacher into a lightweight per-group student scorer, and (4) applies reliability-aware aggregation with per-source retention thresholds.

This repository is one of those student scorers — variant 3 in the QA family, specialized for mathematical reasoning QA (with thinking traces). Given an in-distribution record, it produces a numerical score and a short rationale for every anchor dimension in this group's rubric.


Model summary

Architecture Mixture-of-Experts decoder (35B total / ≈3B active params)
Base model Qwen3.5-35B-A3B-Base
Fine-tuning Full-parameter SFT on Kimi-K2.6 anchored teacher labels
Domain Mathematical reasoning corpora with explicit chain-of-thought — AceReason-1.1, lean_qa, mathcode, QwQ Big-SFT, DeepSeek-R1 distill, Kimi distill. Uses the qa_with_think prompt family (5 think + 5 combined + 5 QA anchor dims).
Anchor rubric 15 group-specific dimensions (group_2_dim_anchors.jsonl in the project repo)
Source count 6 qa sources
Output Structured (score, rationale) per anchor dimension
Precision BF16
License Apache-2.0 (inherits from Qwen3)

Sources covered

This scorer is calibrated for the following mid-training sources in the QA / Math reasoning group:

Source Description
ace_reason AceReason-1.1-SFT
lean_qa Lean theorem-prover QA
mathcode Math-code distill QA
qwq QwQ Big-SFT-Data think-dedup
reason_dpsk32 DeepSeek-R1 32B distill outputs
reason_kimi Kimi distill outputs

The full source-grouping report (KMeans k=4 / 5 clusters, intra-group cosine similarities) is in the project repo.


Anchor dimensions (15 slots)

The scoring rubric for this group, discovered via Kimi-K2.6 free-form judging and clustered into 15 anchor dimensions (KMeans k=15 over the group's dim-score embeddings). Dimensions below are sorted by cluster size — larger clusters dominate the corpus and carry more signal. Anchor names are read verbatim from this group's group_2_dim_anchors.jsonl; some names recur across slots because semantically related but distinct rubric facets were clustered separately by the teacher.

Slot Dimension Cluster size
A1 Factual Correctness 11,915
A2 Difficulty Appropriateness 10,521
A3 Educational Value 10,206
A4 Difficulty Level 10,142
A5 Specificity 7,645
A6 Answer Depth 6,902
A7 Think-Response Consistency 4,881
A8 Answer Completeness 4,858
A9 Verifiability 4,613
A10 Pedagogical Value 4,537
A11 Answer Completeness 4,291
A12 Question Clarity 4,107
A13 Answer Conciseness 3,812
A14 Actionability 3,783
A15 Practical Applicability 2,787

The scorer outputs one [Ai] <dimension>: <score>/10 — <rationale> line per slot, plus overall, training_recommendation, domain_tag, and brief.


Where this model fits in the MIRA pipeline

┌──────────────────┐  ┌──────────────────┐  ┌──────────────────┐  ┌──────────────────┐
│ 1. Rubric        │  │ 2. Anchored      │  │ 3. Reliability   │  │ 4. Data          │
│    Discovery     │→ │    Judge         │→ │    Aggregation   │→ │    Selection     │
│ (Kimi-K2.6,      │  │    Distillation  │  │ (mask unreliable │  │ (per-source      │
│  free-form       │  │ ◀── THIS MODEL   │  │  src×dim cells)  │  │  retention)      │
│  judging)        │  │                  │  │                  │  │                  │
└──────────────────┘  └──────────────────┘  └──────────────────┘  └──────────────────┘

MIRA-QA-Group3 lives in Stage 2: it scores the full QA / Math reasoning corpus so that downstream stages can apply reliability masking and source-aware retention.


Intended use

  • Primary: Score mathematical reasoning QA (with thinking traces) on this group's anchor dimensions to drive source-aware data selection and filtering.
  • Secondary: Research on rubric distillation, semantic quality scoring, and reliability diagnostics for heterogeneous training corpora.

Not intended for:

  • General-purpose chat or instruction following — fine-tuned to emit structured scores, not freeform dialogue.
  • Single-shot quality judgments without the anchor-dimension prompt template — outputs will be miscalibrated.
  • Records outside the QA / Math reasoning group; use the matching sibling scorer instead.

Deployment

The scorer is designed to be served via vLLM behind an OpenAI-compatible endpoint and called in batch from the MIRA scoring pipeline.

1. Serve with vLLM (recommended)

vllm serve whw06/MIRA-QA-Group3 \
    --tensor-parallel-size 8 \
    --dtype bfloat16 \
    --max-model-len 65536 \
    --max-num-batched-tokens 131072 \
    --gpu-memory-utilization 0.9 \
    --trust-remote-code \
    --port 8000

Why these values (verified on H200 141GB during the paper's per-source evaluation):

  • max-model-len=65536 — 2× the mid-training cutoff. Records can hit ~60K tokens for densely-tokenized sources; 40K runs into prompt-overflow errors.
  • max-num-batched-tokens=131072 — supports two full-length sequences per scheduling step.
  • gpu-memory-utilization=0.9 — 35B BF16 weights take ~70GB, leaving ~57GB KV cache. Roughly 4 concurrent 65K-context sequences per GPU.
  • 8-way tensor parallel works well for the 35B MoE on a single 8×H200/A100 node.

2. Call from Python

from openai import OpenAI

client = OpenAI(base_url="http://localhost:8000/v1", api_key="EMPTY")

resp = client.chat.completions.create(
    model="whw06/MIRA-QA-Group3",
    messages=[
        {"role": "system", "content": SYSTEM_PROMPT},   # group-2 anchor calibration
        {"role": "user",   "content": USER_PROMPT},     # record + [A1]..[A15] template
    ],
    temperature=0.7,
    top_p=0.95,
    max_tokens=2048,
)
print(resp.choices[0].message.content)

3. Prompt template

The user message asks for one structured line per anchor dimension (top-15 of this group):

[A1] {anchor_dim_1}: <score>/10 — <justification>
[A2] {anchor_dim_2}: <score>/10 — <justification>
...
[A15] {anchor_dim_15}: <score>/10 — <justification>
overall: <0-100>
training_recommendation: <keep | downsample | drop>
domain_tag: <short tag>
brief: <one-sentence summary>

The system prompt embeds the top-12 anchor calibration references (canonical examples from clustering) so the student matches the teacher's scoring scale. The full prompt builder, anchor JSONL files, and output parser are in the project repo's scoring/score_qa_anchored.py.


Training details

Teacher Kimi-K2.6 (free-form rubric discovery in Phase 1; anchored re-scoring in Phase 2)
Training data Kimi-K2.6 anchored labels on this group's Phase-2 corpus, split into a distillation set + a held-out validation split for reliability diagnostics
Loss Standard next-token CE over (score, rationale) labels for every anchor dimension
Hyperparameters Held constant across all MIRA student scorers; full settings in paper Appendix A.4
Validation Per-dimension teacher–student MAE and Spearman ρ on a held-out split; dimensions failing reliability thresholds are masked post-hoc (Figure 3 in the paper)

Training loss / step curve is preserved in trainer_state.json for full reproducibility.


Headline results (from the paper)

End-to-end downstream evaluation: Qwen2.5-Coder-14B mid-trained on 25B-token MIRA-selected subsets vs. baselines, then SFT, evaluated on 9 code benchmarks across 4 categories.

Method Code Gen MultiplE SQL (EX) SWE-Multi Macro Avg
Base + SFT (no mid) 53.91 72.57 64.24 3.67 48.60
Raw Mixture (50B) 53.71 67.42 94.18 40.00 63.83
Random (25B) 52.71 71.44 91.03 35.00 63.23
DataMan (25B) 53.82 71.38 93.84 33.00 63.01
DSIR (25B) 48.74 67.26 95.20 27.00 59.55
PPL (25B) 50.52 57.74 90.66 20.00 54.73
MIRA-Global (25B) 53.12 67.84 94.26 32.00 61.81
MIRA-Group (25B) 54.53 71.85 94.08 36.33 64.20
MIRA-Source (25B) 54.18 72.84 94.38 30.33 62.93

MIRA-Group matches the full 50B-token raw mixture while using only half the tokens, and out-performs all 25B-token selection baselines on the macro average. This scorer is one of the 12 student models used by the MIRA-Group variant.


Sibling models

MIRA releases one student scorer per source-group variant. Use the matching scorer for each record's format:


Limitations

  • MIRA addresses source-aware filtering only. Source discovery, mixture-ratio design, curriculum scheduling, deduplication and contamination control remain orthogonal concerns.
  • This scorer is calibrated against the QA / Math reasoning group; cross-domain transfer is not advised — use the matching sibling for other source formats.
  • Some anchor dimensions exhibit high teacher–student MAE and are masked post-hoc during aggregation (see paper §3.4). The model still emits scores for masked dimensions; downstream consumers should re-apply the reliability mask from the project repository.
  • Calibrated on 6 sources within this group; behavior on out-of-distribution formats is unverified.

Citation

@inproceedings{wang2026mira,
  title     = {MIRA: Mid-training Rubric Anchoring for Source-Aware Data Selection},
  author    = {Wang, Haowen and Du, Yaxin and Yang, Jian and Wu, Jiajun and
               Liu, Shukai and Zhang, Yuxuan and Wang, Pingjie and Chen, Siheng and
               Zheng, Tuney and Zhou, Ming and Liu, Xianglong},
  booktitle = {Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing (EMNLP)},
  year      = {2026}
}

Acknowledgments

Built on Qwen3.5-35B-A3B-Base and the Megatron-LM training stack. Teacher labels generated with Kimi-K2.6.

Downloads last month
27
Safetensors
Model size
665k params
Tensor type
BF16
·
Inference Providers NEW
This model isn't deployed by any Inference Provider. 🙋 Ask for provider support

Model tree for whw06/MIRA-QA-Group3

Finetuned
(45)
this model