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<!--Copyright 2020 The HuggingFace Team. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
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*This model was published in HF papers on 2020-06-19 and contributed to Hugging Face Transformers on 2020-11-16.*
# SqueezeBERT
## Overview
The SqueezeBERT model was proposed in [SqueezeBERT: What can computer vision teach NLP about efficient neural networks?](https://huggingface.co/papers/2006.11316) by Forrest N. Iandola, Albert E. Shaw, Ravi Krishna, Kurt W. Keutzer. It's a
bidirectional transformer similar to the BERT model. The key difference between the BERT architecture and the
SqueezeBERT architecture is that SqueezeBERT uses [grouped convolutions](https://blog.yani.io/filter-group-tutorial)
instead of fully-connected layers for the Q, K, V and FFN layers.
The abstract from the paper is the following:
*Humans read and write hundreds of billions of messages every day. Further, due to the availability of large datasets,
large computing systems, and better neural network models, natural language processing (NLP) technology has made
significant strides in understanding, proofreading, and organizing these messages. Thus, there is a significant
opportunity to deploy NLP in myriad applications to help web users, social networks, and businesses. In particular, we
consider smartphones and other mobile devices as crucial platforms for deploying NLP models at scale. However, today's
highly-accurate NLP neural network models such as BERT and RoBERTa are extremely computationally expensive, with
BERT-base taking 1.7 seconds to classify a text snippet on a Pixel 3 smartphone. In this work, we observe that methods
such as grouped convolutions have yielded significant speedups for computer vision networks, but many of these
techniques have not been adopted by NLP neural network designers. We demonstrate how to replace several operations in
self-attention layers with grouped convolutions, and we use this technique in a novel network architecture called
SqueezeBERT, which runs 4.3x faster than BERT-base on the Pixel 3 while achieving competitive accuracy on the GLUE test
set. The SqueezeBERT code will be released.*
This model was contributed by [forresti](https://huggingface.co/forresti).
## Usage tips
- SqueezeBERT is a model with absolute position embeddings so it's usually advised to pad the inputs on the right
rather than the left.
- SqueezeBERT is similar to BERT and therefore relies on the masked language modeling (MLM) objective. It is therefore
efficient at predicting masked tokens and at NLU in general, but is not optimal for text generation. Models trained
with a causal language modeling (CLM) objective are better in that regard.
- For best results when finetuning on sequence classification tasks, it is recommended to start with the
*squeezebert/squeezebert-mnli-headless* checkpoint.
## Resources
- [Text classification task guide](../tasks/sequence_classification)
- [Token classification task guide](../tasks/token_classification)
- [Question answering task guide](../tasks/question_answering)
- [Masked language modeling task guide](../tasks/masked_language_modeling)
- [Multiple choice task guide](../tasks/multiple_choice)
## SqueezeBertConfig
[[autodoc]] SqueezeBertConfig
## SqueezeBertTokenizer
[[autodoc]] SqueezeBertTokenizer
- get_special_tokens_mask
- save_vocabulary
## SqueezeBertTokenizerFast
[[autodoc]] SqueezeBertTokenizerFast
## SqueezeBertModel
[[autodoc]] SqueezeBertModel
## SqueezeBertForMaskedLM
[[autodoc]] SqueezeBertForMaskedLM
## SqueezeBertForSequenceClassification
[[autodoc]] SqueezeBertForSequenceClassification
## SqueezeBertForMultipleChoice
[[autodoc]] SqueezeBertForMultipleChoice
## SqueezeBertForTokenClassification
[[autodoc]] SqueezeBertForTokenClassification
## SqueezeBertForQuestionAnswering
[[autodoc]] SqueezeBertForQuestionAnswering