D24 v6.2-0.5

Public preservation release for the half branch of the D24 v6.2 ratio-20 experiment. This repository contains both the terminal midtraining state and its terminal SFT descendant.

Repository layout

  • Repository root: final SFT Transformers model (BF16, SimpleChatML).
  • midtrain-hf/: final midtraining Transformers model (BF16 base model).
  • megatron-midtrain/iter_0002200/: exact terminal Megatron checkpoint, including optimizer/training state.
  • megatron-midtrain/: trackers, completion receipt, and frozen config.
  • provenance/: frozen campaign tickets and SFT receipt/config.
from transformers import AutoModelForCausalLM, AutoTokenizer

repo = "sfanm/d24-v6.2-0.5"
sft_model = AutoModelForCausalLM.from_pretrained(repo, token=True)
sft_tokenizer = AutoTokenizer.from_pretrained(repo, token=True)

midtrain_model = AutoModelForCausalLM.from_pretrained(
    repo, subfolder="midtrain-hf", token=True
)

Lineage

Stage Source/final state
Pretraining iteration 44,000; 184,549,376,000 tokens
Midtraining iteration 2,200; 9,227,468,800 tokens
SFT iteration 1,773; 475,114,114 packed tokens

Historical midtraining used the experiment's branch-scaled WSD schedule: warmup_iters=92 and decay_iters=440 with cosine decay. SFT used a constant learning rate of 1e-4 from optimizer step zero with zero warmup.

Both portable exports contain 756,819,456 parameters in BF16. This repository is an artifact-preservation release with frozen lineage and integrity metadata.

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