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| 16 | + |
| 17 | +# Fine-grained FP8 |
| 18 | + |
| 19 | +With FP8 quantization method, you can quantize your model in FP8 (W8A8): |
| 20 | +- the weights will be quantized in 8bit (FP8) per 2D block (e.g. weight_block_size=(128, 128)) which is inspired from the deepseek implementation |
| 21 | +- Activations are quantized to 8 bits (FP8) per group per token, with the group value matching that of the weights in the input channels (128 by default) |
| 22 | + |
| 23 | +It's implemented to add support for DeepSeek-V3 and DeepSeek-R1 models, you can see the paper [here](https://arxiv.org/pdf/2412.19437), and the image below explains the quantization scheme : |
| 24 | + |
| 25 | + |
| 26 | + |
| 27 | +> [!TIP] |
| 28 | +> You need a GPU with compute capability>=9 (e.g. H100) |
| 29 | +
|
| 30 | +Before you begin, make sure the following libraries are installed with their latest version: |
| 31 | + |
| 32 | +```bash |
| 33 | +pip install --upgrade accelerate torch |
| 34 | +``` |
| 35 | +> [!TIP] |
| 36 | +> You need to install a torch version compatible with the cuda version of your GPU. |
| 37 | +
|
| 38 | + |
| 39 | +By default, the weights are loaded in full precision (torch.float32) regardless of the actual data type the weights are stored in such as torch.float16. Set `torch_dtype="auto"` to load the weights in the data type defined in a model's `config.json` file to automatically load the most memory-optimal data type. |
| 40 | + |
| 41 | +```py |
| 42 | +from transformers import FineGrainedFP8Config, AutoModelForCausalLM, AutoTokenizer |
| 43 | + |
| 44 | +model_name = "meta-llama/Meta-Llama-3-8B" |
| 45 | +quantization_config = FineGrainedFP8Config() |
| 46 | +quantized_model = AutoModelForCausalLM.from_pretrained(model_name, torch_dtype="auto", device_map="auto", quantization_config=quantization_config) |
| 47 | + |
| 48 | +tokenizer = AutoTokenizer.from_pretrained(model_name) |
| 49 | +input_text = "What are we having for dinner?" |
| 50 | +input_ids = tokenizer(input_text, return_tensors="pt").to("cuda") |
| 51 | + |
| 52 | +output = quantized_model.generate(**input_ids, max_new_tokens=10) |
| 53 | +print(tokenizer.decode(output[0], skip_special_tokens=True)) |
| 54 | +``` |
| 55 | + |
| 56 | +A quantized model can be saved via "saved_pretrained" and be reused again via the "from_pretrained". |
| 57 | + |
| 58 | +```py |
| 59 | +quant_path = "/path/to/save/quantized/model" |
| 60 | +model.save_pretrained(quant_path) |
| 61 | +model = AutoModelForCausalLM.from_pretrained(quant_path, device_map="auto") |
| 62 | +``` |
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