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70 lines
2.7 KiB
Markdown
70 lines
2.7 KiB
Markdown
<!--Copyright 2026 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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rendered properly in your Markdown viewer.
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# Unsloth
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[Unsloth](https://unsloth.ai/docs) is a fine-tuning and reinforcement framework that speeds up training and reduces memory usage for large language models. It supports training in 4-bit, 8-bit, and 16-bit precision with custom RoPE and Triton kernels. Unsloth works with Llama, Mistral, Gemma, Qwen, and other model families.
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```py
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from datasets import load_dataset
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from transformers import TrainingArguments
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from unsloth import FastLanguageModel
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from unsloth.trainer import UnslothTrainer
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model, tokenizer = FastLanguageModel.from_pretrained(
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model_name="unsloth/Llama-3.2-1B-Instruct",
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max_seq_length=2048,
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load_in_4bit=True,
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)
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model = FastLanguageModel.get_peft_model(
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model,
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r=16,
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lora_alpha=16,
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target_modules=["q_proj", "k_proj", "v_proj", "o_proj", "gate_proj", "up_proj", "down_proj"],
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)
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dataset = load_dataset("trl-lib/Capybara", split="train[:500]")
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dataset = dataset.map(lambda x: {"text": x["conversations"][0]["value"]})
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trainer = UnslothTrainer(
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model=model,
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tokenizer=tokenizer,
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train_dataset=dataset,
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dataset_text_field="text",
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max_seq_length=2048,
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args=TrainingArguments(
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output_dir="outputs",
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per_device_train_batch_size=2,
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num_train_epochs=1,
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),
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)
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trainer.train()
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```
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## Transformers integration
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Unsloth wraps Transformers APIs and patches internal methods for speed.
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- `FastLanguageModel.from_pretrained` loads config with [`AutoConfig.from_pretrained`]. It then loads a base model with [`AutoModelForCausalLM.from_pretrained`]. Before loading, Unsloth patches attention, decoder layer, and rotary embedding classes inside a Transformers model.
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- `UnslothTrainer` extends TRL's [`~trl.SFTTrainer`]. Unsloth patches [`~Trainer.compute_loss`] and [`~Trainer.training_step`] to fix gradient accumulation in older Transformers versions.
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## Resources
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- [Unsloth](https://unsloth.ai/docs) docs
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- [Make LLM Fine-tuning 2x faster with Unsloth and TRL](https://huggingface.co/blog/unsloth-trl) blog post |