LLaMA Model Card
Model Details
Meta developed and released the Llama 2 family of large language models (LLMs), a collection of pretrained and fine-tuned generative text models ranging in scale from 7 billion to 70 billion parameters. Our fine-tuned LLMs, called Llama-2-Chat, are optimized for dialogue use cases. Llama-2-Chat models outperform open-source chat models on most benchmarks we tested, and in our human evaluations for helpfulness and safety, are on par with some popular closed-source models like ChatGPT and PaLM.
Model Developers Meta
Variations Llama 2 comes in a range of parameter sizes — 7B, 13B, and 70B — as well as pretrained and fine-tuned variations.
Input Models input text only.
Output Models generate text only.
Model Architecture Llama 2 is an auto-regressive language model that uses an optimized transformer architecture. The tuned versions use supervised fine-tuning (SFT) and reinforcement learning with human feedback (RLHF) to align to human preferences for helpfulness and safety.
Llama 2
A new mix of publicly available online data
7B
4k
✗
2.0T
3.0 x 10-4
Llama 2
A new mix of publicly available online data
13B
4k
✗
2.0T
3.0 x 10-4
Llama 2
A new mix of publicly available online data
70B
4k
✔
2.0T
1.5 x 10-4
Llama 2 family of models. Token counts refer to pretraining data only. All models are trained with a global batch-size of 4M tokens. The 70B version uses Grouped-Query Attention (GQA) for improved inference scalability.
Model Dates Llama 2 was trained between January 2023 and July 2023.
Status This is a static model trained on an offline dataset. Future versions of the tuned models will be released as we improve model safety with community feedback.
License A custom commercial license is available at: https://ai.meta.com/resources/models-and-libraries/llama-downloads/
Research Paper More information can be found in the paper "Llama-2: Open Foundation and Fine-tuned Chat Models", available at https://ai.meta.com/research/publications/llama-2-open-foundation-and-fine-tuned-chat-models/.
Where to send questions or comments about the model Instructions on how to provide feedback or comments on the model can be found in the model README.
Intended Use
Intended Use Cases Llama 2 is intended for commercial and research use in English. Tuned models are intended for assistant-like chat, whereas pretrained models can be adapted for a variety of natural language generation tasks.
Out-of-scope Uses Use in any manner that violates applicable laws or regulations (including trade compliance laws). Use in languages other than English. Use in any other way that is prohibited by the Acceptable Use Policy and Licensing Agreement for Llama 2.
Hardware and Software
Training Factors We used custom training libraries, Meta's Research Super Cluster, and production clusters for pretraining. Fine-tuning, annotation, and evaluation were also performed on third-party cloud compute.
Carbon Footprint Pretraining utilized a cumulative 3.3M GPU hours of computation on hardware of type A100-80GB (TDP of 350-400W). Estimated total emissions were 539 tCO2eq, 100% of which were offset by Meta’s sustainability program.
Time (GPU hours)
Power Consumption (W)
Carbon Emitted(tCO2eq)
Llama 2 7B
184320
400
31.22
Llama 2 13B
368640
400
62.44
Llama 2 70B
1720320
400
291.42
Total
3311616
539.00
CO2 emissions during pretraining. Time: total GPU time required for training each model. Power Consumption: peak power capacity per GPU device for the GPUs used adjusted for power usage efficiency. 100% of the emissions are directly offset by Meta's sustainability program, and because we are openly releasing these models, the pretraining costs do not need to be incurred by others.
Training Data
Overview Llama 2 was pretrained on 2 trillion tokens of data from publicly available sources. The fine-tuning data includes publicly available instruction datasets, as well as over one million new human-annotated examples. Neither the pretraining nor the fine-tuning datasets include Meta user data.
Data Freshness The pretraining data has a cutoff of September 2022, but some tuning data is more recent, up to July 2023.
Evaluation Results
In this section, we report the results for the Llama 1 and Llama 2 models on standard academic benchmarks. For all the evaluations, we use our internal evaluations library.
Llama 1
7B
14.1
60.8
46.2
58.5
6.95
35.1
30.3
23.9
Llama 1
13B
18.9
66.1
52.6
62.3
10.9
46.9
37.0
33.9
Llama 1
33B
26.0
70.0
58.4
67.6
21.4
57.8
39.8
41.7
Llama 1
65B
30.7
70.7
60.5
68.6
30.8
63.4
43.5
47.6
Llama 2
7B
16.8
63.9
48.9
61.3
14.6
45.3
32.6
29.3
Llama 2
13B
24.5
66.9
55.4
65.8
28.7
54.8
39.4
39.1
Llama 2
70B
37.5
71.9
63.6
69.4
35.2
68.9
51.2
54.2
Overall performance on grouped academic benchmarks.
Code: We report the average pass@1 scores of our models on HumanEval and MBPP. (Note: MBPP or Mostly Basic Python Programming, is the benchmark consists of around 1,000 crowd-sourced Python programming problems, designed to be solvable by entry-level programmers, covering programming covering fundamentals, standard library functionality, and so on. Each problem consists of a task description, code solution and 3 automated test cases.)
Commonsense Reasoning: We report the average of PIQA, SIQA, HellaSwag, WinoGrande, ARC easy and challenge, OpenBookQA, and CommonsenseQA. We report 7-shot results for CommonSenseQA and 0-shot results for all other benchmarks.
World Knowledge: We evaluate the 5-shot performance on NaturalQuestions and TriviaQA and report the average.
Reading Comprehension: For reading comprehension, we report the 0-shot average on SQuAD, QuAC, and BoolQ. MATH: We report the average of the GSM8K (8 shot) and MATH (4 shot) benchmarks at top 1.
Llama 1
7B
27.42
23.00
Llama 1
13B
41.74
23.08
Llama 1
33B
44.19
22.57
Llama 1
65B
48.71
21.77
Llama 2
7B
33.29
21.25
Llama 2
13B
41.86
26.10
Llama 2
70B
50.18
24.60
Evaluation of pretrained LLMs on automatic safety benchmarks. For TruthfulQA, we present the percentage of generations that are both truthful and informative (the higher the better). For ToxiGen, we present the percentage of toxic generations (the smaller the better).
Llama-2-Chat
7B
57.04
0.00
Llama-2-Chat
13B
62.18
0.00
Llama-2-Chat
70B
64.14
0.01
Evaluation of fine-tuned LLMs on different safety datasets. Same metric definitions as above.
Ethical Considerations and Limitations
LlaMA 2 is a new technology that carries risks with use. Testing conducted to date has been in English, and has not covered, nor could it cover all scenarios. For these reasons, as with all LLMs, LlaMA 2’s potential outputs cannot be predicted in advance, and the model may in some instances produce inaccurate, biased or other objectionable responses to user prompts. Therefore, before deploying any applications of Llama 2, developers should perform safety testing and tuning tailored to their specific applications of the model.
Please see the Responsible Use Guide available at https://ai.meta.com/llama/responsible-use-guide/
Last updated