transformers/docs/source/en/model_doc/olmoe.md

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*This model was published in HF papers on 2024-09-03 and contributed to Hugging Face Transformers on 2024-09-03.*

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<img alt="FlashAttention" src="https://img.shields.io/badge/%E2%9A%A1%EF%B8%8E%20FlashAttention-eae0c8?style=flat">
<img alt="SDPA" src="https://img.shields.io/badge/SDPA-DE3412?style=flat&logo=pytorch&logoColor=white">
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# OLMoE

[OLMoE](https://huggingface.co/papers/2409.02060) is a sparse Mixture-of-Experts (MoE) language model with 7B parameters but only 1B parameters are used per input token. It has similar inference costs as dense models but trains ~3x faster. OLMoE uses fine-grained routing with 64 small experts in each layer and uses a dropless token-based routing algorithm.

You can find all the original OLMoE checkpoints under the [OLMoE](https://huggingface.co/collections/allenai/olmoe-november-2024-66cf678c047657a30c8cd3da) collection.

> [!TIP]
> This model was contributed by [Muennighoff](https://huggingface.co/Muennighoff).
>
> Click on the OLMoE models in the right sidebar for more examples of how to apply OLMoE to different language tasks.

The example below demonstrates how to generate text with [`Pipeline`] or the [`AutoModel`] class.

<hfoptions id="usage">
<hfoption id="Pipeline">

```python
from transformers import pipeline


pipe = pipeline(
    task="text-generation",
    model="allenai/OLMoE-1B-7B-0125",
    device=0,
)

result = pipe("Dionysus is the god of")
print(result)
```

</hfoption>
<hfoption id="AutoModel">

```python
from transformers import AutoModelForCausalLM, AutoTokenizer


model = AutoModelForCausalLM.from_pretrained("allenai/OLMoE-1B-7B-0924", attn_implementation="sdpa", device_map="auto")
tokenizer = AutoTokenizer.from_pretrained("allenai/OLMoE-1B-7B-0924")

inputs = tokenizer("Bitcoin is", return_tensors="pt").to(model.device)
inputs = {k: v.to(model.device) for k, v in inputs.items()}
output = model.generate(**inputs, max_length=64)
print(tokenizer.decode(output[0]))
```

## Quantization

Quantization reduces the memory burden of large models by representing the weights in a lower precision. Refer to the [Quantization](../quantization/overview) overview for more available quantization backends.
The example below uses [bitsandbytes](../quantization/bitsandbytes) to only quantize the weights to 4-bits.

```python
import torch

from transformers import AutoModelForCausalLM, AutoTokenizer, BitsAndBytesConfig


quantization_config = BitsAndBytesConfig(
   load_in_4bit=True,
   bnb_4bit_compute_dtype=torch.float16,
   bnb_4bit_use_double_quant=True,
   bnb_4bit_quant_type="nf4"
)

model = AutoModelForCausalLM.from_pretrained("allenai/OLMoE-1B-7B-0924", attn_implementation="sdpa", device_map="auto", quantization_config=quantization_config)
tokenizer = AutoTokenizer.from_pretrained("allenai/OLMoE-1B-7B-0924")

inputs = tokenizer("Bitcoin is", return_tensors="pt").to(model.device)
inputs = {k: v.to(model.device) for k, v in inputs.items()}
output = model.generate(**inputs, max_length=64)
print(tokenizer.decode(output[0]))
```

## OlmoeConfig

[[autodoc]] OlmoeConfig

## OlmoeModel

[[autodoc]] OlmoeModel
    - forward

## OlmoeForCausalLM

[[autodoc]] OlmoeForCausalLM
    - forward