Meta has developed and publicly 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. We provide a detailed description of our approach to fine-tuning and safety improvements of Llama-2-Chat in order to enable the community to build on our work and contribute to the responsible development of LLMs.

Note: Use of this model is governed by the Meta license. Click on View License above.

	Training Data	Params	Content Length	GQA	Tokens	LR
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. Bigger model -- 70B -- uses Grouped-Query Attention (GQA) for improved inference scalability.

Model Developers Meta AI

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 optimized transformer. The tuned versions use supervised fine-tuning (SFT) and reinforcement learning with human feedback (RLHF) to align to human preferences for helpfulness and safety.

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. Please see the Artifacts tab.

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, or by opening an issue in the GitHub repository.

Version: 22

disable-batch : true training_datasets : Publicly available sources maas-inference : true inference_supported_envs : ['vllm', 'ds_mii']

View in Studio: https://ml.azure.com/registries/azureml/models/Llama-2-13b-chat/version/22

languages: EN

evaluation-min-sku-spec: 12|2|224|1474

inference-min-sku-spec: 24|4|448|2900

evaluation-recommended-sku: Standard_NC12s_v3, Standard_NC24s_v3, Standard_ND40rs_v2, Standard_ND96asr_v4, Standard_ND96amsr_A100_v4

inference-recommended-sku: Standard_NC24s_v3, Standard_ND40rs_v2, Standard_ND96asr_v4, Standard_ND96amsr_A100_v4

azureml.copyRegistryFilesToWorkspace: True

SharedComputeCapacityEnabled: True