allenai / Emo_1b14b_1T

Emo_1b14b_1T

The main release of EMO from EMO: Pretraining Mixture of Experts for Emergent Modularity — referred to as EMO (1T tokens, midtrained) in the paper.

1B-active / 14B-total parameter Mixture-of-Experts model (128 experts: 127 routed + 1 shared, k=8 active per token) pretrained on 1T tokens of the OLMoE pretraining mix and annealed under the EMO objective for an additional 50B tokens. Tokens within the same document are constrained to route through a shared pool of experts during training, producing expert subsets that can be deployed in isolation for specific domains with minimal performance degradation.

Usage

from transformers import AutoModelForCausalLM, AutoTokenizer

model_id = "allenai/Emo_1b14b_1T"
model = AutoModelForCausalLM.from_pretrained(model_id, trust_remote_code=True)
tokenizer = AutoTokenizer.from_pretrained(model_id, trust_remote_code=True)

inputs = tokenizer(["Language modeling is "], return_tensors="pt", return_token_type_ids=False)
out = model.generate(**inputs, max_new_tokens=100, do_sample=True, temperature=1.0, top_p=0.7)
print(tokenizer.batch_decode(out, skip_special_tokens=True)[0])

Citation

@article{wang2026emo,
  title  = {EMO: Pretraining Mixture of Experts for Emergent Modularity},
  author = {Wang, Ryan and Bhagia, Akshita and Min, Sewon},
  year   = {2026},
  url    = {https://arxiv.org/abs/2605.06663}
}

Links

• Paper: https://arxiv.org/abs/2605.06663
• Code: https://github.com/allenai/EMO