OLMo 3 3B SiameseNorm + DepthAttention — Stage 2 Mid-training
This repository is the Hugging Face export of o3sd3b-s2-s8192-g256-m1-ga2-tp2-cp1-dp128-h16-b8-mc2-lr2p071e4-256npu-arch-0903100156-s2v2 at
iteration 47684. This model preserves the trained SiameseNorm + DepthAttention architecture through bundled Hugging Face remote code. Load it with trust_remote_code=True.
- Training sequence length: 8,192
- Model context capacity: 8,192
- Sliding-window size: 4,096
- Attention pattern:
[SWA, SWA, SWA, Full] - Vocabulary: 100,278 real tokens; 74 Megatron padding-only rows removed
Stage 3/4 use the frozen 65,536-token configuration. YaRN applies to the Full Attention layers; SWA layers retain their original RoPE and 4,096-token local window.
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Use transformers>=4.57.6,<5.
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
repo_id = "ArchSpace-Collection/OLMo3-3B-SiameseNorm-DepthAttention-stage2"
tokenizer = AutoTokenizer.from_pretrained(
repo_id,
trust_remote_code=True,
use_fast=True,
fix_mistral_regex=False,
)
model = AutoModelForCausalLM.from_pretrained(
repo_id,
trust_remote_code=True,
dtype=torch.bfloat16,
attn_implementation="sdpa",
)
fix_mistral_regex=False preserves the exact tokenizer behavior used during
training. Conversion provenance, per-tensor hashes, and CPU validation results
are included in conversion_manifest.json, SHA256SUMS, and
hf_validation_report.json.