sft-flint-section-v2-3ep arm of the caveman reasoning-compression ablation study: Qwen/Qwen3.5-4B fine-tuned (LoRA adapter) on flint/data/flint-section-aware.jsonl (552 rows, 3 epochs, LoRA r=64).

The study asks whether compressed ("caveman") reasoning traces can train a model to reason in fewer tokens without losing accuracy — and which parts of a trace are compressible. See the run manifest below for the exact recipe; eval results live in the study's report.

Eval summary (t=0, max_tokens 8192)

Accuracy (avg reasoning tokens, loop rate) — this arm vs the original model it was fine-tuned from (Qwen/Qwen3.5-4B), same harness and prompts.

suite	this model	original Qwen3.5-4B
gsm8k@t0.0	0.66 (3483.3 tok, loops 0.22)	0.575 (4413.4 tok, loops 0.2167)
math500@t0.0	0.49 (5472.3 tok, loops 0.18)	0.3083 (6631.6 tok, loops 0.2833)

Run manifest

json

{
  "arm": "sft-flint-section-v2-3ep",
  "dataset": "flint/data/flint-section-aware.jsonl",
  "rows": 552,
  "dropped_overlong": 0,
  "epochs": 3,
  "system_prompts": true,
  "lora": {
    "r": 64,
    "alpha": 128,
    "dropout": 0.0,
    "target": "all"
  },
  "train": {
    "epochs": 2,
    "lr": 0.0002,
    "batch_size": 1,
    "grad_accum": 16,
    "warmup_ratio": 0.03,
    "lr_scheduler": "cosine",
    "weight_decay": 0.01,
    "seed": 3407,
    "logging_steps": 10,
    "save_strategy": "epoch"
  },
  "model": {
    "name": "Qwen/Qwen3.5-4B",
    "max_seq_length": 13312,
    "load_in_4bit": true,
    "chat_template": "qwen3.5"
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    {
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      "learning_rate": 3.0957997942825336e-05,
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    {
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    {
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      "learning_rate": 1.7364751777736332e-06,
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    },
    {
      "train_runtime": 7129.7994,
      "train_samples_per_second": 0.232,
      "train_steps_per_second": 0.015,
      "total_flos": 2.0013017119053005e+17,
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  ]
}

marcodsn/qwen3.5-4b-sft-flint-section-v2-3ep

qwen3.5-4b-sft-flint-section-v2-3ep

Eval summary (t=0, max_tokens 8192)

Run manifest

marcodsn/
qwen3.5-4b-sft-flint-section-v2-3ep