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+ ---
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+ language: en
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+ tags:
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+ - exbert
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+ license: apache-2.0
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+ datasets:
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+ - bookcorpus
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+ - wikipedia
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+ ---
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+
11
+ # BERT base model (uncased)
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+
13
+ Pretrained model on English language using a masked language modeling (MLM) objective. It was introduced in
14
+ [this paper](https://arxiv.org/abs/1810.04805) and first released in
15
+ [this repository](https://github.com/google-research/bert). This model is uncased: it does not make a difference
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+ between english and English.
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+
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+ Disclaimer: The team releasing BERT did not write a model card for this model so this model card has been written by
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+ the Hugging Face team.
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+
21
+ ## Model description
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+
23
+ BERT is a transformers model pretrained on a large corpus of English data in a self-supervised fashion. This means it
24
+ was pretrained on the raw texts only, with no humans labelling them in any way (which is why it can use lots of
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+ publicly available data) with an automatic process to generate inputs and labels from those texts. More precisely, it
26
+ was pretrained with two objectives:
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+
28
+ - Masked language modeling (MLM): taking a sentence, the model randomly masks 15% of the words in the input then run
29
+ the entire masked sentence through the model and has to predict the masked words. This is different from traditional
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+ recurrent neural networks (RNNs) that usually see the words one after the other, or from autoregressive models like
31
+ GPT which internally mask the future tokens. It allows the model to learn a bidirectional representation of the
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+ sentence.
33
+ - Next sentence prediction (NSP): the models concatenates two masked sentences as inputs during pretraining. Sometimes
34
+ they correspond to sentences that were next to each other in the original text, sometimes not. The model then has to
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+ predict if the two sentences were following each other or not.
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+
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+ This way, the model learns an inner representation of the English language that can then be used to extract features
38
+ useful for downstream tasks: if you have a dataset of labeled sentences for instance, you can train a standard
39
+ classifier using the features produced by the BERT model as inputs.
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+
41
+ ## Model variations
42
+
43
+ BERT has originally been released in base and large variations, for cased and uncased input text. The uncased models also strips out an accent markers.
44
+ Chinese and multilingual uncased and cased versions followed shortly after.
45
+ Modified preprocessing with whole word masking has replaced subpiece masking in a following work, with the release of two models.
46
+ Other 24 smaller models are released afterwards.
47
+
48
+ The detailed release history can be found on the [google-research/bert readme](https://github.com/google-research/bert/blob/master/README.md) on github.
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+
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+ | Model | #params | Language |
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+ |------------------------|--------------------------------|-------|
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+ | [`bert-base-uncased`](https://huggingface.co/bert-base-uncased) | 110M | English |
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+ | [`bert-large-uncased`](https://huggingface.co/bert-large-uncased) | 340M | English | sub
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+ | [`bert-base-cased`](https://huggingface.co/bert-base-cased) | 110M | English |
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+ | [`bert-large-cased`](https://huggingface.co/bert-large-cased) | 340M | English |
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+ | [`bert-base-chinese`](https://huggingface.co/bert-base-chinese) | 110M | Chinese |
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+ | [`bert-base-multilingual-cased`](https://huggingface.co/bert-base-multilingual-cased) | 110M | Multiple |
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+ | [`bert-large-uncased-whole-word-masking`](https://huggingface.co/bert-large-uncased-whole-word-masking) | 340M | English |
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+ | [`bert-large-cased-whole-word-masking`](https://huggingface.co/bert-large-cased-whole-word-masking) | 340M | English |
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+
61
+ ## Intended uses & limitations
62
+
63
+ You can use the raw model for either masked language modeling or next sentence prediction, but it's mostly intended to
64
+ be fine-tuned on a downstream task. See the [model hub](https://huggingface.co/models?filter=bert) to look for
65
+ fine-tuned versions on a task that interests you.
66
+
67
+ Note that this model is primarily aimed at being fine-tuned on tasks that use the whole sentence (potentially masked)
68
+ to make decisions, such as sequence classification, token classification or question answering. For tasks such as text
69
+ generation you should look at model like GPT2.
70
+
71
+ ### How to use
72
+
73
+ You can use this model directly with a pipeline for masked language modeling:
74
+
75
+ ```python
76
+ >>> from transformers import pipeline
77
+ >>> unmasker = pipeline('fill-mask', model='bert-base-uncased')
78
+ >>> unmasker("Hello I'm a [MASK] model.")
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+
80
+ [{'sequence': "[CLS] hello i'm a fashion model. [SEP]",
81
+ 'score': 0.1073106899857521,
82
+ 'token': 4827,
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+ 'token_str': 'fashion'},
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+ {'sequence': "[CLS] hello i'm a role model. [SEP]",
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+ 'score': 0.08774490654468536,
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+ 'token': 2535,
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+ 'token_str': 'role'},
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+ {'sequence': "[CLS] hello i'm a new model. [SEP]",
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+ 'score': 0.05338378623127937,
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+ 'token': 2047,
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+ 'token_str': 'new'},
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+ {'sequence': "[CLS] hello i'm a super model. [SEP]",
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+ 'score': 0.04667217284440994,
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+ 'token': 3565,
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+ 'token_str': 'super'},
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+ {'sequence': "[CLS] hello i'm a fine model. [SEP]",
97
+ 'score': 0.027095865458250046,
98
+ 'token': 2986,
99
+ 'token_str': 'fine'}]
100
+ ```
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+
102
+ Here is how to use this model to get the features of a given text in PyTorch:
103
+
104
+ ```python
105
+ from transformers import BertTokenizer, BertModel
106
+ tokenizer = BertTokenizer.from_pretrained('bert-base-uncased')
107
+ model = BertModel.from_pretrained("bert-base-uncased")
108
+ text = "Replace me by any text you'd like."
109
+ encoded_input = tokenizer(text, return_tensors='pt')
110
+ output = model(**encoded_input)
111
+ ```
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+
113
+ and in TensorFlow:
114
+
115
+ ```python
116
+ from transformers import BertTokenizer, TFBertModel
117
+ tokenizer = BertTokenizer.from_pretrained('bert-base-uncased')
118
+ model = TFBertModel.from_pretrained("bert-base-uncased")
119
+ text = "Replace me by any text you'd like."
120
+ encoded_input = tokenizer(text, return_tensors='tf')
121
+ output = model(encoded_input)
122
+ ```
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+
124
+ ### Limitations and bias
125
+
126
+ Even if the training data used for this model could be characterized as fairly neutral, this model can have biased
127
+ predictions:
128
+
129
+ ```python
130
+ >>> from transformers import pipeline
131
+ >>> unmasker = pipeline('fill-mask', model='bert-base-uncased')
132
+ >>> unmasker("The man worked as a [MASK].")
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+
134
+ [{'sequence': '[CLS] the man worked as a carpenter. [SEP]',
135
+ 'score': 0.09747550636529922,
136
+ 'token': 10533,
137
+ 'token_str': 'carpenter'},
138
+ {'sequence': '[CLS] the man worked as a waiter. [SEP]',
139
+ 'score': 0.0523831807076931,
140
+ 'token': 15610,
141
+ 'token_str': 'waiter'},
142
+ {'sequence': '[CLS] the man worked as a barber. [SEP]',
143
+ 'score': 0.04962705448269844,
144
+ 'token': 13362,
145
+ 'token_str': 'barber'},
146
+ {'sequence': '[CLS] the man worked as a mechanic. [SEP]',
147
+ 'score': 0.03788609802722931,
148
+ 'token': 15893,
149
+ 'token_str': 'mechanic'},
150
+ {'sequence': '[CLS] the man worked as a salesman. [SEP]',
151
+ 'score': 0.037680890411138535,
152
+ 'token': 18968,
153
+ 'token_str': 'salesman'}]
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+
155
+ >>> unmasker("The woman worked as a [MASK].")
156
+
157
+ [{'sequence': '[CLS] the woman worked as a nurse. [SEP]',
158
+ 'score': 0.21981462836265564,
159
+ 'token': 6821,
160
+ 'token_str': 'nurse'},
161
+ {'sequence': '[CLS] the woman worked as a waitress. [SEP]',
162
+ 'score': 0.1597415804862976,
163
+ 'token': 13877,
164
+ 'token_str': 'waitress'},
165
+ {'sequence': '[CLS] the woman worked as a maid. [SEP]',
166
+ 'score': 0.1154729500412941,
167
+ 'token': 10850,
168
+ 'token_str': 'maid'},
169
+ {'sequence': '[CLS] the woman worked as a prostitute. [SEP]',
170
+ 'score': 0.037968918681144714,
171
+ 'token': 19215,
172
+ 'token_str': 'prostitute'},
173
+ {'sequence': '[CLS] the woman worked as a cook. [SEP]',
174
+ 'score': 0.03042375110089779,
175
+ 'token': 5660,
176
+ 'token_str': 'cook'}]
177
+ ```
178
+
179
+ This bias will also affect all fine-tuned versions of this model.
180
+
181
+ ## Training data
182
+
183
+ The BERT model was pretrained on [BookCorpus](https://yknzhu.wixsite.com/mbweb), a dataset consisting of 11,038
184
+ unpublished books and [English Wikipedia](https://en.wikipedia.org/wiki/English_Wikipedia) (excluding lists, tables and
185
+ headers).
186
+
187
+ ## Training procedure
188
+
189
+ ### Preprocessing
190
+
191
+ The texts are lowercased and tokenized using WordPiece and a vocabulary size of 30,000. The inputs of the model are
192
+ then of the form:
193
+
194
+ ```
195
+ [CLS] Sentence A [SEP] Sentence B [SEP]
196
+ ```
197
+
198
+ With probability 0.5, sentence A and sentence B correspond to two consecutive sentences in the original corpus and in
199
+ the other cases, it's another random sentence in the corpus. Note that what is considered a sentence here is a
200
+ consecutive span of text usually longer than a single sentence. The only constrain is that the result with the two
201
+ "sentences" has a combined length of less than 512 tokens.
202
+
203
+ The details of the masking procedure for each sentence are the following:
204
+ - 15% of the tokens are masked.
205
+ - In 80% of the cases, the masked tokens are replaced by `[MASK]`.
206
+ - In 10% of the cases, the masked tokens are replaced by a random token (different) from the one they replace.
207
+ - In the 10% remaining cases, the masked tokens are left as is.
208
+
209
+ ### Pretraining
210
+
211
+ The model was trained on 4 cloud TPUs in Pod configuration (16 TPU chips total) for one million steps with a batch size
212
+ of 256. The sequence length was limited to 128 tokens for 90% of the steps and 512 for the remaining 10%. The optimizer
213
+ used is Adam with a learning rate of 1e-4, \\(\beta_{1} = 0.9\\) and \\(\beta_{2} = 0.999\\), a weight decay of 0.01,
214
+ learning rate warmup for 10,000 steps and linear decay of the learning rate after.
215
+
216
+ ## Evaluation results
217
+
218
+ When fine-tuned on downstream tasks, this model achieves the following results:
219
+
220
+ Glue test results:
221
+
222
+ | Task | MNLI-(m/mm) | QQP | QNLI | SST-2 | CoLA | STS-B | MRPC | RTE | Average |
223
+ |:----:|:-----------:|:----:|:----:|:-----:|:----:|:-----:|:----:|:----:|:-------:|
224
+ | | 84.6/83.4 | 71.2 | 90.5 | 93.5 | 52.1 | 85.8 | 88.9 | 66.4 | 79.6 |
225
+
226
+
227
+ ### BibTeX entry and citation info
228
+
229
+ ```bibtex
230
+ @article{DBLP:journals/corr/abs-1810-04805,
231
+ author = {Jacob Devlin and
232
+ Ming{-}Wei Chang and
233
+ Kenton Lee and
234
+ Kristina Toutanova},
235
+ title = {{BERT:} Pre-training of Deep Bidirectional Transformers for Language
236
+ Understanding},
237
+ journal = {CoRR},
238
+ volume = {abs/1810.04805},
239
+ year = {2018},
240
+ url = {http://arxiv.org/abs/1810.04805},
241
+ archivePrefix = {arXiv},
242
+ eprint = {1810.04805},
243
+ timestamp = {Tue, 30 Oct 2018 20:39:56 +0100},
244
+ biburl = {https://dblp.org/rec/journals/corr/abs-1810-04805.bib},
245
+ bibsource = {dblp computer science bibliography, https://dblp.org}
246
+ }
247
+ ```
248
+
249
+ <a href="https://huggingface.co/exbert/?model=bert-base-uncased">
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+ <img width="300px" src="https://cdn-media.huggingface.co/exbert/button.png">
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+ </a>
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