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transformers/docs/source/en/model_doc/mamba.md
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transformers/docs/source/en/model_doc/mamba.md
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<!--Copyright 2024 The HuggingFace Team. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
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an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
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specific language governing permissions and limitations under the License.
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⚠️ Note that this file is in Markdown but contain specific syntax for our doc-builder (similar to MDX) that may not be
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*This model was released on 2023-12-01 and added to Hugging Face Transformers on 2024-03-05.*
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<div style="float: right;">
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<div class="flex flex-wrap space-x-1">
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<img alt="PyTorch" src="https://img.shields.io/badge/PyTorch-DE3412?style=flat&logo=pytorch&logoColor=white">
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</div>
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</div>
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# Mamba
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[Mamba](https://huggingface.co/papers/2312.00752) is a selective structured state space model (SSMs) designed to work around Transformers computational inefficiency when dealing with long sequences. It is a completely attention-free architecture, and comprised of a combination of H3 and gated MLP blocks (Mamba block). Mamba's "content-based reasoning" allows it to focus on specific parts of an input depending on the current token. Mamba also uses a new hardware-aware parallel algorithm to compensate for the lack of convolutional operations. As a result, Mamba has fast inference and can scale to very long sequences.
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You can find all the original Mamba checkpoints under the [State Space Models](https://huggingface.co/state-spaces) organization.
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> [!TIP]
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> This model was contributed by [Molbap](https://huggingface.co/Molbap) and [AntonV](https://huggingface.co/AntonV).
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> Click on the Mamba models in the right sidebar for more examples of how to apply Mamba to different language tasks.
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The example below demonstrates how to generate text with [`Pipeline`], [`AutoModel`], and from the command line.
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<hfoptions id="usage">
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<hfoption id="Pipeline">
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```py
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import torch
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from transformers import pipeline
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pipeline = pipeline(
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task="text-generation",
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model="state-spaces/mamba-130m-hf",
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dtype=torch.float16,
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device=0
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)
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pipeline("Plants create energy through a process known as")
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```
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</hfoption>
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<hfoption id="AutoModel">
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```py
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import torch
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from transformers import AutoModelForCausalLM, AutoTokenizer
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tokenizer = AutoTokenizer.from_pretrained("state-spaces/mamba-130m-hf")
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model = AutoModelForCausalLM.from_pretrained("state-spaces/mamba-130m-hf", dtype=torch.float16, device_map="auto",)
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input_ids = tokenizer("Plants create energy through a process known as", return_tensors="pt").to(model.device)
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output = model.generate(**input_ids)
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print(tokenizer.decode(output[0], skip_special_tokens=True)
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```
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</hfoption>
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<hfoption id="transformers CLI">
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```bash
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echo -e "Plants create energy through a process known as" | transformers run --task text-generation --model state-spaces/mamba-130m-hf --device 0
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```
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</hfoption>
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</hfoptions>
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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.
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The example below uses [torchao](../quantization/torchao) to only quantize the weights to 4-bit integers.
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```py
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import torch
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from transformers import AutoModelForCausalLM, AutoTokenizer, TorchAoConfig
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from torchao.quantization import Int4WeightOnlyConfig
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quantization_config = Int4WeightOnlyConfig(group_size=128)
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quantization_config = TorchAoConfig(quant_type=quant_config)
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tokenizer = AutoTokenizer.from_pretrained("state-spaces/mamba-2.8b-hf")
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model = AutoModelForCausalLM.from_pretrained("state-spaces/mamba-2.8b-hf", dtype=torch.bfloat16, quantization_config=quantization_config, device_map="auto",)
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input_ids = tokenizer("Plants create energy through a process known as", return_tensors="pt").to(model.device)
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output = model.generate(**input_ids)
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print(tokenizer.decode(output[0], skip_special_tokens=True))
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```
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## Notes
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- The current implementation uses the original CUDA kernels. The FlashAttention equivalent implementation is hosted in the [mamba-ssm](https://github.com/state-spaces/mamba) and [causal_conv1d](https://github.com/Dao-AILab/causal-conv1d) repositories. Make sure to install them if your hardware supports it!
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- Mamba stacks `mixer` layers which are equivalent to `Attention` layers. You can find the main logic of Mamba in the `MambaMixer` class.
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- The example below demonstrates how to fine-tune Mamba with [PEFT](https://huggingface.co/docs/peft).
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```py
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from datasets import load_dataset
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from trl import SFTConfig, SFTTrainer
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from peft import LoraConfig
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model_id = "state-spaces/mamba-130m-hf"
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dataset = load_dataset("Abirate/english_quotes", split="train")
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training_args = SFTConfig(dataset_text_field="quote")
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lora_config = LoraConfig(target_modules=["x_proj", "embeddings", "in_proj", "out_proj"])
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trainer = SFTTrainer(
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model=model_id,
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args=training_args,
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train_dataset=dataset,
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peft_config=lora_config,
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)
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trainer.train()
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```
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## MambaCache
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[[autodoc]] MambaCache
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- update_conv_state
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- update_ssm_state
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- reset
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## MambaConfig
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[[autodoc]] MambaConfig
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## MambaModel
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[[autodoc]] MambaModel
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- forward
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## MambaLMHeadModel
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[[autodoc]] MambaForCausalLM
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- forward
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