# Milestone 2 Model and Training Artefact Delivery

This English-language package consolidates nine historical model checkpoints, the
core training and data-preparation code, launch scripts, provenance evidence, datasets
already selected for delivery, and integrity tooling. Four additional SFT checkpoints
(S1--S4) were selected for this model-only increment.

## Delivered Models

| Model | Path | Initialisation | Training record |
|---|---|---|---|
| CodeGPT multilingual CPT | `models/pretrained/codegpt_multilingual_5epoch/` | `AISE-TUDelft/CodeGPT-Multilingual`, revision `f373547d1234992a64cd08d64cd69abbb3a83579` | 5 epochs, 222,615 steps, 8,753,591,494 training tokens |
| GPT-2 124M CPT | `models/pretrained/gpt2_124m_code_5epoch/` | `openai-community/gpt2`, revision `607a30d783dfa663caf39e06633721c8d4cfcd7e` | 5 epochs, 222,615 steps, 8,753,591,494 training tokens |
| Qwen2.5-Coder-7B CPT | `models/pretrained/qwen25_coder_7b_cpt/` | `Qwen/Qwen2.5-Coder-7B`, revision `0396a76181e127dfc13e5c5ec48a8cee09938b02` | full-parameter CPT, 3 epochs, 18,165/18,165 steps |
| Qwen2.5-Coder-0.5B Stage-1 CPT | `models/pretrained/stage1_cpt/` | `Qwen/Qwen2.5-Coder-0.5B` | continued-pre-training deliverable |
| Qwen2.5-Coder-0.5B-Instruct F3 SFT | `models/sft/sft_f3_refined_instruct/` | `Qwen/Qwen2.5-Coder-0.5B-Instruct` | reported pass@1 9.1%; pass@5 13.0% |
| S1: Qwen2.5-Coder-0.5B-Instruct, F3 clean | `models/sft/sft_f3_clean_instruct/` | `Qwen/Qwen2.5-Coder-0.5B-Instruct` | 473,465 records; step 14,550; reported pass@1 9.1%, pass@5 13.0% |
| S2: Qwen2.5-Coder-0.5B-Instruct, F3 high-quality v4 | `models/sft/sft_f3_hq_instruct/` | `Qwen/Qwen2.5-Coder-0.5B-Instruct` | 134,775 records; step 4,212; reported pass@1 8.3%, pass@5 13.0% |
| S3: Qwen2.5-Coder-0.5B-Instruct, F3+F4 clean | `models/sft/sft_f3f4_instruct/` | `Qwen/Qwen2.5-Coder-0.5B-Instruct` | 491,004 records; step 15,033; reported pass@1 5.7%, pass@5 11.5% |
| S4: Qwen2.5-Coder-0.5B-Instruct, F4 clean | `models/sft/sft_f4_instruct/` | `Qwen/Qwen2.5-Coder-0.5B-Instruct` | 17,539 records; step 484; reported pass@1 0.9%, pass@5 2.5% |

All nine directories are standard Hugging Face checkpoints. The 7B selection is the
completed full-parameter continued-pre-training checkpoint, not the separate historical
7B LoRA instruction-tuning experiment.

The S1--S4 identifiers, exact source checkpoints, and evaluation results are catalogued
in `models/sft/README.md`. In particular, S3 used 491,004 records (473,465 F3 records plus
17,539 F4 records); this corrects the approximate 150K count in an earlier historical
report. The checkpoint arguments, launch record, and measured input files support the
491,004-record count.

Model weights, tokenisers, and available effective-argument records are included.
Optimizer, scheduler, and random-number-generator states are excluded because this is a
model and training-recipe delivery, not a mid-run resume package.

## Training Code and Scripts

The GPT-2-family runs used the `llm.c` code snapshot at Git commit
`f1e2ace651495b74ae22d45d1723443fd00ecd3a`. The required CUDA trainer, headers,
Makefile, dataset converter, and Hugging Face import/export utilities are preserved in
`code/llmc_training/`. Exact historical launch scripts are in `training_scripts/pretrain/`.

The Qwen runs used ms-swift. The 7B run-specific command, package snapshot, system record,
and complete training log are in `evidence/training_runs/qwen25_coder_7b_cpt/`. The smaller
May 2026 runs did not capture run-specific package snapshots; this limitation is documented
in `environment/KNOWN_LIMITATIONS.md`.

This S1--S4 increment contains the selected model checkpoints and their provenance
catalogue. Additional S2--S4 datasets and variant-specific launch scripts remain in the
local candidate staging area and are not part of this upload.

Historical scripts intentionally retain the absolute paths, GPU assignments, Docker image,
ports, and cache locations used at training time. Replace these machine-specific paths
before rerunning.

## Training-Data Dependency

CodeGPT, GPT-2, and Qwen2.5-Coder-7B were trained from the same historical source file:

```text
/raid/data/weifeng/Datasets/code_messages_pre_train.jsonl
2,239,565 records; 20,021,101,140 bytes
SHA-256: 74e8b9111dfca80324ade8da530858584cc3833d7650688989eedd1cb6d0f25d
```

That 20 GB raw source is not duplicated in this model-and-code increment. The GPT-2-family
tokenisation and deterministic train/validation split implementation is included at
`code/llmc_training/dev/data/code_messages.py`. The smaller filtered Stage-1 dataset and
the complete F3 chain already remain under `data/`.

## F3 Filtering and Evaluation Evidence

`data/f3/` contains the input, principal intermediate artefacts, score output, and final
207,009-record F3 training dataset. Its corresponding code is in `code/f3_filtering/`.
Stage 4 used an external `Qwen3-Coder-30B-A3B-Instruct` scoring model; its saved scores and
final dataset are included, while its original absolute model path must be replaced on a
new system.

`evidence/eval/f3_refined_9p1_summary.json` records the historical Runnable alignment
evaluation: 200 tasks, five samples per task, 1,000 attempts, pass@1 of 9.1%, and pass@5 of
13.0%. This is not the later repository-level Core/Hold benchmark.

## Licensing and External Distribution

See `THIRD_PARTY_NOTICES.md`. The official GPT-2 metadata declares MIT and the Qwen2.5
Coder model declares Apache-2.0. The official CodeGPT-Multilingual repository declares no
model licence; its derivative checkpoint therefore requires explicit rights confirmation
before distribution outside the authorised delivery channel.

## Integrity and Validation

- `MANIFEST.json` maps every delivered file to its source and SHA-256 digest.
- `SHA256SUMS` supports byte-level verification after transfer.
- `tools/build_manifest.py` regenerates both integrity records.
- `tools/smoke_test.py` loads the delivered checkpoints and checks finite,
  non-degenerate logits.

Hard-linked files are a local storage optimisation only. Archives and Hugging Face uploads
read the full file contents, so recipients receive ordinary complete files.