---
license: other
license_name: jamba-open-model-license
license_link: https://www.ai21.com/jamba-open-model-license/
library_name: transformers
---
# Model Information
Built with hybrid SSM-Transformer architecture, the Jamba 1.6 family of models outperform other open, instruction-following foundation models on quality, speed, and long context performance, and rival leading closed models on quality. As open models, Jamba Mini 1.6 (12B active/52B total) and Jamba Large 1.6 (94B active/398B total) are available for private deployment, either in VPC or on-premise, and demonstrate superior performance on the kind of long context tasks that matter most to enterprises, such as RAG workflows and grounded question answering across lengthy documents.
The models are released under the Jamba Open Model License, a permissive license allowing full research use and commercial use under the license terms.
If you need to license the model for your needs, talk to us.
For more details of this model, see the release [blog post](https://www.ai21.com/blog/introducing-jamba-1-6).
## Model Details
- **Developed by:** [AI21](https://www.ai21.com)
- **Model type:** Joint Attention and Mamba (Jamba)
- **License:** [Jamba Open Model License](https://www.ai21.com/licenses/jamba-open-model-license)
- **Context length:** 256K
- **Knowledge cutoff date:** March 5, 2024
- **Supported languages:** English, Spanish, French, Portuguese, Italian, Dutch, German, Arabic and Hebrew
## Results on common benchmarks
| Benchmark | Jamba Mini 1.6 | Ministral 8B | Llama 3.1 8B | Command R7B |
|--------------|:-----:|:-----:|:-----:|:-----:|
| Arena Hard | 51.2| 41.35| 28.17| 27.95|
| CRAG | 76.2| 52| 60| 23.1|
| FinanceBench (FullDoc) | 45.4 | 19.2 | 28.4 | 2.8|
| HELMET LongQA | 46.9 | 33 | 29.2| 9.6|
| LongBench | 32 | 17.5 | 17.7 | 2|
LongBench and Arena Hard scores are from official leaderboards for applicable models. Examples that couldn't fit models' context windows were scored accordingly. Due to a 32K context limit in its vLLM deployment, Ministral 8B was evaluated through its official API.
# Usage
## Prerequisites
In order to run optimized Mamba implementations, you first need to install `mamba-ssm` and `causal-conv1d`:
```bash
pip install mamba-ssm causal-conv1d>=1.2.0
```
You also have to have the model on a CUDA device.
## Run the model with vLLM
The recommended way to perform efficient inference with Jamba Mini 1.6 is using [vLLM](https://docs.vllm.ai/en/latest/). First, make sure to install vLLM (version 0.5.4 or higher is required)
```bash
pip install vllm>=0.5.4
```
In the example below, `number_gpus` should match the number of GPUs you want to deploy Jamba Mini 1.6 on. A minimum of 2 80GB GPUs is required.
```python
from vllm import LLM, SamplingParams
from transformers import AutoTokenizer
model = "ai21labs/AI21-Jamba-Mini-1.6"
number_gpus = 2
llm = LLM(model=model,
max_model_len=200*1024,
tensor_parallel_size=number_gpus)
tokenizer = AutoTokenizer.from_pretrained(model)
messages = [
{"role": "system", "content": "You are an ancient oracle who speaks in cryptic but wise phrases, always hinting at deeper meanings."},
{"role": "user", "content": "Hello!"},
]
prompts = tokenizer.apply_chat_template(messages, add_generation_prompt=True, tokenize=False)
sampling_params = SamplingParams(temperature=0.4, top_p=0.95, max_tokens=100)
outputs = llm.generate(prompts, sampling_params)
generated_text = outputs[0].outputs[0].text
print(generated_text)
#Output: Seek and you shall find. The path is winding, but the journey is enlightening. What wisdom do you seek from the ancient echoes?
```
With the default BF16 precision on 2 80GB A100 GPUs and default vLLM configuration, you'll be able to perform inference on prompts up to 200K tokens long. On more than 2 80GB GPUs, you can easily fit the full 256K context.
Note: vLLM's `main` branch has some memory utilization improvements specific to the Jamba architecture that allow using the full 256K context length on 2 80 GPUs. You can [build vLLM from source](https://docs.vllm.ai/en/latest/getting_started/installation.html#build-from-source) if you wish to make use of them.
### ExpertsInt8 quantization
We've developed an innovative and efficient quantization technique, [ExpertsInt8](https://www.ai21.com/blog/announcing-jamba-model-family#:~:text=Like%20all%20models%20in%20its%20size%20class%2C%20Jamba%201.6%20Large%20can%E2%80%99t%20be%20loaded%20in%20full%20(FP32)%20or%20half%20(FP16/BF16)%20precision%20on%20a%20single%20node%20of%208%20GPUs.%20Dissatisfied%20with%20currently%20available%20quantization%20techniques%2C%20we%20developed%20ExpertsInt8%2C%20a%20novel%20quantization%20technique%20tailored%20for%20MoE%20models.), designed for MoE models deployed in vLLM, including Jamba models. Using it, you'll be able to deploy Jamba Mini 1.6 on a single 80GB GPU.
In order to use ExpertsInt8, you need to use vllm version 0.5.5 or higher: `pip install vllm>=0.5.5`
With default vLLM configuration, you can fit prompts up to 100K on a single 80GB A100 GPU:
```python
import os
os.environ['VLLM_FUSED_MOE_CHUNK_SIZE']='32768' # This is a workaround a bug in vLLM's fused_moe kernel
from vllm import LLM
llm = LLM(model="ai21labs/AI21-Jamba-Mini-1.6",
max_model_len=100*1024,
quantization="experts_int8")
```
## Run the model with `transformers`
The following example loads Jamba Mini 1.6 to the GPU in BF16 precision, uses optimized [FlashAttention2](https://github.com/Dao-AILab/flash-attention) and Mamba kernels, and parallelizes the model across multiple GPUs using [accelerate](https://huggingface.co./docs/accelerate/index). Note that in half precision (FP16/BF16), Jamba Mini 1.6 is too large to fit on a single 80GB GPU, so you'll need at least 2 such GPUs.
```python
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
model = AutoModelForCausalLM.from_pretrained("ai21labs/AI21-Jamba-Mini-1.6",
torch_dtype=torch.bfloat16,
attn_implementation="flash_attention_2",
device_map="auto")
tokenizer = AutoTokenizer.from_pretrained("ai21labs/AI21-Jamba-Mini-1.6")
messages = [
{"role": "system", "content": "You are an ancient oracle who speaks in cryptic but wise phrases, always hinting at deeper meanings."},
{"role": "user", "content": "Hello!"},
]
input_ids = tokenizer.apply_chat_template(messages, add_generation_prompt=True, return_tensors='pt').to(model.device)
outputs = model.generate(input_ids, max_new_tokens=216)
# Decode the output
conversation = tokenizer.decode(outputs[0], skip_special_tokens=True)
# Split the conversation to get only the assistant's response
assistant_response = conversation.split(messages[-1]['content'])[1].strip()
print(assistant_response)
# Output: Seek and you shall find. The path is winding, but the journey is enlightening. What wisdom do you seek from the ancient echoes?
```
Note: Versions 4.44.0 and 4.44.1 of `transformers` have a bug that restricts the ability to run the Jamba architecture. Make sure you're not using these versions.
Note: If you're having trouble installing `mamba-ssm` and `causal-conv1d` for the optimized Mamba kernels, you can run Jamba Mini 1.6 without them, at the cost of extra latency. In order to do that, add the kwarg `use_mamba_kernels=False` when loading the model via `AutoModelForCausalLM.from_pretained()`.
Load the model in 8-bit
**Using 8-bit precision, it is possible to fit up to 140K sequence length on a single 80GB GPU.** You can easily quantize the model to 8-bit using [bitsandbytes](https://huggingface.co./docs/bitsandbytes/index). In order to not degrade model quality, we recommend to exclude the Mamba blocks from the quantization:
```python
from transformers import AutoModelForCausalLM, BitsAndBytesConfig
quantization_config = BitsAndBytesConfig(load_in_8bit=True,
llm_int8_skip_modules=["mamba"])
model = AutoModelForCausalLM.from_pretrained("ai21labs/AI21-Jamba-Mini-1.6",
torch_dtype=torch.bfloat16,
attn_implementation="flash_attention_2",
quantization_config=quantization_config)
```
Load the model on CPU
If you don't have access to a GPU, you can also load and run Jamba Mini 1.6 on a CPU. Note this will result in poor inference performance.
```python
from transformers import AutoModelForCausalLM
model = AutoModelForCausalLM.from_pretrained("ai21labs/AI21-Jamba-Mini-1.6",
use_mamba_kernels=False)
```
# Model features
## Tool use with Jamba
Jamba Mini 1.6 supports tool use capabilities in accordance with Huggingface's tool use API. The tools defined by the user are inserted into a dedicated section in the chat template which the model was trained to recognize.
Given a conversation that contains tools, the model can output content, tool invocations or both.
Tool usage example
```python
from transformers import AutoTokenizer
tokenizer = AutoTokenizer.from_pretrained("ai21labs/AI21-Jamba-Mini-1.6")
messages = [
{
"role": "user",
"content": "What's the weather like right now in Jerusalem and in London?"
}
]
tools = [
{
'type': 'function',
'function': {
'name': 'get_current_weather',
'description': 'Get the current weather',
'parameters': {
'type': 'object',
'properties': {
'location': {'type': 'string', 'description': 'The city and state, e.g. San Francisco, CA'},
'format': {'type': 'string', 'enum': ['celsius', 'fahrenheit'], 'description': 'The temperature unit to use. Infer this from the users location.'}
},
'required': ['location', 'format']
}
}
}
]
prompt = tokenizer.apply_chat_template(
messages,
tools=tools,
tokenize=False,
)
```
Output:
```
[
{"name": "get_current_weather", "arguments": {"location": "Jerusalem", "format": "celsius"}},
{"name": "get_current_weather", "arguments": {"location": "celsius", "format": "celsius"}}
]
```
Feeding back tool responses into the model
Now that the model has called the tools, we need to feed the tool responses back to the model. In the next call, send the assistant message with the `tool_messages` field, as shown below, along with additional `tool` messages (in the corresponding order) that contain the tool outputs.
The `arguments` field for each tool call can be either a dict or a JSON string.
```python
from transformers import AutoTokenizer
tokenizer = AutoTokenizer.from_pretrained("ai21labs/AI21-Jamba-Mini-1.6")
# Note that you must send the tool responses in the same order as the model called the tools:
messages = [
{
"role": "user",
"content": "What's the weather like right now in Jerusalem and in London?"
},
{
"role": "assistant",
"content": null,
"tool_calls": [
{
"name": "get_current_weather",
"arguments": "{\"location\": \"Jerusalem\", \"format\": \"celsius\"}"
},
{
"name": "get_current_weather",
"arguments": "{\"location\": \"London\", \"format\": \"celsius\"}"
}
]
},
{
"role": "tool",
"content": "The weather in Jerusalem is 18 degrees celsius."
},
{
"role": "tool",
"content": "The weather in London is 8 degrees celsius."
}
]
tool_use_prompt = tokenizer.apply_chat_template(
messages,
tools=tools,
tokenize=False,
)
```
example output:
```
The weather in Jerusalem is currently 18 degrees Celsius. In London, it is 8 degrees Celsius.
```