MIRA-Agent-Group1

A student scorer from MIRA (Mid-training Rubric Anchoring for Source-Aware Data Selection), fine-tuned to score CLI / general-purpose agent 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 1 in the Agent family, specialized for CLI / general-purpose agent 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 Multi-turn agent traces from CLI-style coding assistants (claude-cli, codex, gemini-cli, opencode, hermes), covering tool calls, reasoning steps and tool feedback.
Anchor rubric 15 group-specific dimensions (group_A_dim_anchors.jsonl in the project repo)
Source count 6 agent sources
Phase-2 corpus (this group) 456,412 teacher-scored records
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 Agent / CLI-and-generalist group:

Source Description
agent_codex Codex CLI agent traces
claude_cli Claude CLI agent traces
cli_linxi Mixed CLI corpora (claude-code, gemini, opencode)
ct_terminal_cli Internal terminal-CLI agent traces
ct_webdev Internal web-dev agent traces
hermes_agent_reasoning_traces Hermes agentic reasoning traces

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_A_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 Communication Conciseness 118,444
A2 Code Reference Accuracy 99,507
A3 Goal Achievement 88,516
A4 Tool Selection 80,189
A5 Goal Achievement 73,562
A6 Multi-turn Coherence 56,425
A7 Error Recovery 54,747
A8 Safety & scope 52,242
A9 Action Efficiency 51,115
A10 Tool Argument Correctness 48,507
A11 Plan Quality / Reasoning Transparency 36,400
A12 Language Appropriateness 35,042
A13 System Prompt Adherence 34,776
A14 Tool selection 29,836
A15 Plan Quality / Reasoning Transparency 24,115

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-Agent-Group1 lives in Stage 2: it scores the full Agent / CLI-and-generalist corpus so that downstream stages can apply reliability masking and source-aware retention.


Intended use

  • Primary: Score CLI / general-purpose agent 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 Agent / CLI-and-generalist 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-Agent-Group1 \
    --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-Agent-Group1",
    messages=[
        {"role": "system", "content": SYSTEM_PROMPT},   # group-A 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_agent_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 Agent / CLI-and-generalist 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.

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