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https://github.com/huggingface/transformers.git
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d253de6d58
* initial * fix * fix * update * fix * fixes * quantization * attention mask visualizer * multimodal * small changes * fix code samples
259 lines
9.2 KiB
Markdown
259 lines
9.2 KiB
Markdown
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">
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<img alt="SDPA" src="https://img.shields.io/badge/SDPA-DE3412?style=flat&logo=pytorch&logoColor=white">
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</div>
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</div>
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# BERT
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[BERT](https://huggingface.co/papers/1810.04805) is a bidirectional transformer pretrained on unlabeled text to predict masked tokens in a sentence and to predict whether one sentence follows another. The main idea is that by randomly masking some tokens, the model can train on text to the left and right, giving it a more thorough understanding. BERT is also very versatile because its learned language representations can be adapted for other NLP tasks by fine-tuning an additional layer or head.
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You can find all the original BERT checkpoints under the [BERT](https://huggingface.co/collections/google/bert-release-64ff5e7a4be99045d1896dbc) collection.
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> [!TIP]
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> Click on the BERT models in the right sidebar for more examples of how to apply BERT to different language tasks.
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The example below demonstrates how to predict the `[MASK]` token 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="fill-mask",
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model="google-bert/bert-base-uncased",
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torch_dtype=torch.float16,
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device=0
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)
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pipeline("Plants create [MASK] through a process known as photosynthesis.")
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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 AutoModelForMaskedLM, AutoTokenizer
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tokenizer = AutoTokenizer.from_pretrained(
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"google-bert/bert-base-uncased",
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)
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model = AutoModelForMaskedLM.from_pretrained(
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"google-bert/bert-base-uncased",
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torch_dtype=torch.float16,
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device_map="auto",
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attn_implementation="sdpa"
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)
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inputs = tokenizer("Plants create [MASK] through a process known as photosynthesis.", return_tensors="pt").to("cuda")
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with torch.no_grad():
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outputs = model(**inputs)
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predictions = outputs.logits
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masked_index = torch.where(inputs['input_ids'] == tokenizer.mask_token_id)[1]
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predicted_token_id = predictions[0, masked_index].argmax(dim=-1)
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predicted_token = tokenizer.decode(predicted_token_id)
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print(f"The predicted token is: {predicted_token}")
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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 [MASK] through a process known as photosynthesis." | transformers-cli run --task fill-mask --model google-bert/bert-base-uncased --device 0
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```
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</hfoption>
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</hfoptions>
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## Notes
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- Inputs should be padded on the right because BERT uses absolute position embeddings.
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## BertConfig
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[[autodoc]] BertConfig
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- all
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## BertTokenizer
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[[autodoc]] BertTokenizer
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- build_inputs_with_special_tokens
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- get_special_tokens_mask
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- create_token_type_ids_from_sequences
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- save_vocabulary
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## BertTokenizerFast
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[[autodoc]] BertTokenizerFast
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## BertModel
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[[autodoc]] BertModel
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- forward
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## BertForPreTraining
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[[autodoc]] BertForPreTraining
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- forward
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## BertLMHeadModel
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[[autodoc]] BertLMHeadModel
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- forward
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## BertForMaskedLM
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[[autodoc]] BertForMaskedLM
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- forward
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## BertForNextSentencePrediction
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[[autodoc]] BertForNextSentencePrediction
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- forward
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## BertForSequenceClassification
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[[autodoc]] BertForSequenceClassification
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- forward
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## BertForMultipleChoice
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[[autodoc]] BertForMultipleChoice
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- forward
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## BertForTokenClassification
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[[autodoc]] BertForTokenClassification
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- forward
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## BertForQuestionAnswering
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[[autodoc]] BertForQuestionAnswering
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- forward
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## TFBertTokenizer
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[[autodoc]] TFBertTokenizer
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## TFBertModel
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[[autodoc]] TFBertModel
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- call
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## TFBertForPreTraining
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[[autodoc]] TFBertForPreTraining
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- call
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## TFBertModelLMHeadModel
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[[autodoc]] TFBertLMHeadModel
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- call
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## TFBertForMaskedLM
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[[autodoc]] TFBertForMaskedLM
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- call
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## TFBertForNextSentencePrediction
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[[autodoc]] TFBertForNextSentencePrediction
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- call
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## TFBertForSequenceClassification
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[[autodoc]] TFBertForSequenceClassification
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- call
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## TFBertForMultipleChoice
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[[autodoc]] TFBertForMultipleChoice
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- call
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## TFBertForTokenClassification
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[[autodoc]] TFBertForTokenClassification
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- call
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## TFBertForQuestionAnswering
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[[autodoc]] TFBertForQuestionAnswering
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- call
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## FlaxBertModel
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[[autodoc]] FlaxBertModel
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- __call__
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## FlaxBertForPreTraining
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[[autodoc]] FlaxBertForPreTraining
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- __call__
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## FlaxBertForCausalLM
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[[autodoc]] FlaxBertForCausalLM
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- __call__
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## FlaxBertForMaskedLM
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[[autodoc]] FlaxBertForMaskedLM
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- __call__
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## FlaxBertForNextSentencePrediction
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[[autodoc]] FlaxBertForNextSentencePrediction
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- __call__
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## FlaxBertForSequenceClassification
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[[autodoc]] FlaxBertForSequenceClassification
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- __call__
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## FlaxBertForMultipleChoice
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[[autodoc]] FlaxBertForMultipleChoice
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- __call__
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## FlaxBertForTokenClassification
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[[autodoc]] FlaxBertForTokenClassification
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- __call__
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## FlaxBertForQuestionAnswering
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[[autodoc]] FlaxBertForQuestionAnswering
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- __call__
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## Bert specific outputs
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[[autodoc]] models.bert.modeling_bert.BertForPreTrainingOutput
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[[autodoc]] models.bert.modeling_tf_bert.TFBertForPreTrainingOutput
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[[autodoc]] models.bert.modeling_flax_bert.FlaxBertForPreTrainingOutput |