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<div class="flex flex-wrap space-x-1">
<img alt="PyTorch" src="https://img.shields.io/badge/PyTorch-DE3412?style=flat&logo=pytorch&logoColor=white">
<img alt="TensorFlow" src="https://img.shields.io/badge/TensorFlow-FF6F00?style=flat&logo=tensorflow&logoColor=white">
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">
<img alt="SDPA" src="https://img.shields.io/badge/SDPA-DE3412?style=flat&logo=pytorch&logoColor=white">
</div>
</div>
# BERT
[BERT](https://huggingface.co/papers/1810.04805) 是一个在无标签的文本数据上预训练的双向 transformer用于预测句子中被掩码的masked token以及预测一个句子是否跟随在另一个句子之后。其主要思想是在预训练过程中通过随机掩码一些 token让模型利用左右上下文的信息预测它们从而获得更全面深入的理解。此外BERT 具有很强的通用性,其学习到的语言表示可以通过额外的层或头进行微调,从而适配其他下游 NLP 任务。
你可以在 [BERT](https://huggingface.co/collections/google/bert-release-64ff5e7a4be99045d1896dbc) 集合下找到 BERT 的所有原始 checkpoint。
> [!TIP]
> 点击右侧边栏中的 BERT 模型,以查看将 BERT 应用于不同语言任务的更多示例。
下面的示例演示了如何使用 [`Pipeline`], [`AutoModel`] 和命令行预测 `[MASK]` token。
<hfoptions id="usage">
<hfoption id="Pipeline">
```py
import torch
from transformers import pipeline
pipeline = pipeline(
task="fill-mask",
model="google-bert/bert-base-uncased",
dtype=torch.float16,
device=0
)
pipeline("Plants create [MASK] through a process known as photosynthesis.")
```
</hfoption>
<hfoption id="AutoModel">
```py
import torch
from transformers import AutoModelForMaskedLM, AutoTokenizer
tokenizer = AutoTokenizer.from_pretrained(
"google-bert/bert-base-uncased",
)
model = AutoModelForMaskedLM.from_pretrained(
"google-bert/bert-base-uncased",
dtype=torch.float16,
device_map="auto",
attn_implementation="sdpa"
)
inputs = tokenizer("Plants create [MASK] through a process known as photosynthesis.", return_tensors="pt").to("cuda")
with torch.no_grad():
outputs = model(**inputs)
predictions = outputs.logits
masked_index = torch.where(inputs['input_ids'] == tokenizer.mask_token_id)[1]
predicted_token_id = predictions[0, masked_index].argmax(dim=-1)
predicted_token = tokenizer.decode(predicted_token_id)
print(f"The predicted token is: {predicted_token}")
```
</hfoption>
</hfoptions>
## 注意
- 输入内容应在右侧进行填充,因为 BERT 使用绝对位置嵌入。
## BertConfig
[[autodoc]] BertConfig
- all
## BertTokenizer
[[autodoc]] BertTokenizer
- get_special_tokens_mask
- save_vocabulary
## BertTokenizerLegacy
[[autodoc]] BertTokenizerLegacy
## BertTokenizerFast
[[autodoc]] BertTokenizerFast
## BertModel
[[autodoc]] BertModel
- forward
## BertForPreTraining
[[autodoc]] BertForPreTraining
- forward
## BertLMHeadModel
[[autodoc]] BertLMHeadModel
- forward
## BertForMaskedLM
[[autodoc]] BertForMaskedLM
- forward
## BertForNextSentencePrediction
[[autodoc]] BertForNextSentencePrediction
- forward
## BertForSequenceClassification
[[autodoc]] BertForSequenceClassification
- forward
## BertForMultipleChoice
[[autodoc]] BertForMultipleChoice
- forward
## BertForTokenClassification
[[autodoc]] BertForTokenClassification
- forward
## BertForQuestionAnswering
[[autodoc]] BertForQuestionAnswering
- forward
## Bert specific outputs
[[autodoc]] models.bert.modeling_bert.BertForPreTrainingOutput