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[docs] Increase visibility of torch_dtype="auto" (#35067)

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* auto-dtype

* feedback
This commit is contained in:
Steven Liu
2024-12-04 09:18:44 -08:00
committed by GitHub
parent baa3b22137
commit 1ed1de2fec
11 changed files with 49 additions and 35 deletions
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15
docs/source/en/quantization/bitsandbytes.md
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@@ -64,7 +64,7 @@ model_8bit = AutoModelForCausalLM.from_pretrained(
)
```
By default, all the other modules such as `torch.nn.LayerNorm` are converted to `torch.float16`. You can change the data type of these modules with the `torch_dtype` parameter if you want:
By default, all the other modules such as `torch.nn.LayerNorm` are converted to `torch.float16`. You can change the data type of these modules with the `torch_dtype` parameter if you want. Setting `torch_dtype="auto"` loads the model in the data type defined in a model's `config.json` file.
```py
import torch
@@ -75,7 +75,7 @@ quantization_config = BitsAndBytesConfig(load_in_8bit=True)
model_8bit = AutoModelForCausalLM.from_pretrained(
"facebook/opt-350m",
quantization_config=quantization_config,
torch_dtype=torch.float32
torch_dtype="auto"
)
model_8bit.model.decoder.layers[-1].final_layer_norm.weight.dtype
```
@@ -112,7 +112,7 @@ model_4bit = AutoModelForCausalLM.from_pretrained(
)
```
By default, all the other modules such as `torch.nn.LayerNorm` are converted to `torch.float16`. You can change the data type of these modules with the `torch_dtype` parameter if you want:
By default, all the other modules such as `torch.nn.LayerNorm` are converted to `torch.float16`. You can change the data type of these modules with the `torch_dtype` parameter if you want. Setting `torch_dtype="auto"` loads the model in the data type defined in a model's `config.json` file.
```py
import torch
@@ -123,7 +123,7 @@ quantization_config = BitsAndBytesConfig(load_in_4bit=True)
model_4bit = AutoModelForCausalLM.from_pretrained(
"facebook/opt-350m",
quantization_config=quantization_config,
torch_dtype=torch.float32
torch_dtype="auto"
)
model_4bit.model.decoder.layers[-1].final_layer_norm.weight.dtype
```
@@ -190,6 +190,7 @@ Now load your model with the custom `device_map` and `quantization_config`:
```py
model_8bit = AutoModelForCausalLM.from_pretrained(
"bigscience/bloom-1b7",
torch_dtype="auto",
device_map=device_map,
quantization_config=quantization_config,
)
@@ -212,6 +213,7 @@ quantization_config = BitsAndBytesConfig(
model_8bit = AutoModelForCausalLM.from_pretrained(
model_id,
torch_dtype="auto",
device_map=device_map,
quantization_config=quantization_config,
)
@@ -232,6 +234,7 @@ quantization_config = BitsAndBytesConfig(
model_8bit = AutoModelForCausalLM.from_pretrained(
model_id,
torch_dtype="auto",
device_map="auto",
quantization_config=quantization_config,
)
@@ -275,7 +278,7 @@ nf4_config = BitsAndBytesConfig(
bnb_4bit_quant_type="nf4",
)
model_nf4 = AutoModelForCausalLM.from_pretrained(model_id, quantization_config=nf4_config)
model_nf4 = AutoModelForCausalLM.from_pretrained(model_id, torch_dtype="auto", quantization_config=nf4_config)
```
For inference, the `bnb_4bit_quant_type` does not have a huge impact on performance. However, to remain consistent with the model weights, you should use the `bnb_4bit_compute_dtype` and `torch_dtype` values.
@@ -292,7 +295,7 @@ double_quant_config = BitsAndBytesConfig(
bnb_4bit_use_double_quant=True,
)
model_double_quant = AutoModelForCausalLM.from_pretrained("meta-llama/Llama-2-13b", quantization_config=double_quant_config)
model_double_quant = AutoModelForCausalLM.from_pretrained("meta-llama/Llama-2-13b", torch_dtype="auto", quantization_config=double_quant_config)
```
## Dequantizing `bitsandbytes` models