Model Information
We introduce Nemotron-UltraLong-8B, a series of ultra-long context language models designed to process extensive sequences of text (up to 1M, 2M, and 4M tokens) while maintaining competitive performance on standard benchmarks. Built on the Llama-3.1, UltraLong-8B leverages a systematic training recipe that combines efficient continued pretraining with instruction tuning to enhance long-context understanding and instruction-following capabilities. This approach enables our models to efficiently scale their context windows without sacrificing general performance.
The UltraLong Models
- nvidia/Llama-3.1-Nemotron-8B-UltraLong-1M-Instruct
- nvidia/Llama-3.1-Nemotron-8B-UltraLong-2M-Instruct
- nvidia/Llama-3.1-Nemotron-8B-UltraLong-4M-Instruct
Uses
Starting with transformers >= 4.43.0 onward, you can run conversational inference using the Transformers pipeline abstraction or by leveraging the Auto classes with the generate() function.
Make sure to update your transformers installation via pip install --upgrade transformers.
import transformers
import torch
model_id = "nvidia/Llama-3.1-Nemotron-8B-UltraLong-2M-Instruct"
pipeline = transformers.pipeline(
"text-generation",
model=model_id,
model_kwargs={"torch_dtype": torch.bfloat16},
device_map="auto",
)
messages = [
{"role": "system", "content": "You are a pirate chatbot who always responds in pirate speak!"},
{"role": "user", "content": "Who are you?"},
]
outputs = pipeline(
messages,
max_new_tokens=256,
)
print(outputs[0]["generated_text"][-1])
Model Card
- Base model: meta-llama/Llama-3.1-8B-Instruct
- Continued Pretraining: The training data consists of 1B tokens sourced from a pretraining corpus using per-domain upsampling based on sample length. The model was trained for 245 steps with a sequence length of 2M and a global batch size of 2.
- Supervised fine-tuning (SFT): 1B tokens on open-source instruction datasets across general, mathematics, and code domains. We subsample the data from the ‘general_sft_stage2’ from AceMath-Instruct.
- Maximum context window: 2M tokens
Evaluation Results
We evaluate Nemotron-UltraLong-8B on a diverse set of benchmarks, including long-context tasks (e.g., RULER, LV-Eval, and InfiniteBench) and standard tasks (e.g., MMLU, MATH, GSM-8K, and HumanEval). UltraLong-8B achieves superior performance on ultra-long context tasks while maintaining competitive results on standard benchmarks.
Needle in a Haystack
Long context evaluation
Standard capability evaluation
Correspondence to
Chejian Xu (chejian2@illinois.edu), Wei Ping (wping@nvidia.com)