boltuix / bert-micro

Model Card for boltuix/bert-micro

The boltuix/bert-micro model is the smallest BERT variant in the BoltUIX family, designed for natural language processing tasks requiring blazing-fast performance in highly resource-constrained environments. Pretrained on English text using masked language modeling (MLM) and next sentence prediction (NSP) objectives, it is optimized for fine-tuning on lightweight NLP tasks, such as basic sequence classification and token classification. With a size of ~15 MB, it offers moderate accuracy for applications prioritizing speed and efficiency over high precision.

Model Details

Model Description

The boltuix/bert-micro model is a PyTorch-based transformer model derived from TensorFlow checkpoints in the Google BERT repository. It builds on research from On the Importance of Pre-training Compact Models ( arXiv ) and Generalization in NLI: Ways (Not) To Go Beyond Simple Heuristics ( arXiv ). Ported to Hugging Face, this uncased model (~15 MB) is engineered for minimal NLP applications, such as basic sentiment analysis and named entity recognition, making it ideal for developers and researchers targeting ultra-lightweight deployments on edge devices.

• Developed by: BoltUIX
• Funded by: BoltUIX Research Fund
• Shared by: Hugging Face
• Model type: Transformer (BERT)
• Language(s) (NLP): English ( en )
• License: MIT
• Finetuned from model: google-bert/bert-base-uncased

Model Sources

• Repository: Hugging Face Model Hub
• Paper: BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding
• Demo: Hugging Face Spaces Demo

Model Variants

BoltUIX offers a range of BERT-based models tailored to different performance and resource requirements. The boltuix/bert-micro model is the smallest and fastest option, ideal for applications needing minimal resource usage with moderate accuracy. Below is a summary of available models:

For more details on each variant, visit the BoltUIX Model Hub .

Uses

Direct Use

The model can be used directly for masked language modeling or next sentence prediction tasks, such as predicting missing words in sentences or determining sentence coherence, delivering moderate accuracy in these core tasks.

Downstream Use

The model is designed for fine-tuning on lightweight downstream NLP tasks, including:

• Basic sequence classification (e.g., simple sentiment analysis, intent detection)
• Token classification (e.g., named entity recognition)
• Simple question answering (e.g., basic extractive QA) It is recommended for developers and researchers working on highly resource-constrained devices, such as low-power edge devices, where speed and minimal resource usage are critical.

Out-of-Scope Use

The model is not suitable for:

• Text generation tasks (use generative models like GPT-3 instead).
• Non-English language tasks without significant fine-tuning.
• Applications requiring high accuracy (use boltuix/bert-tinyplus , boltuix/bert-small , or larger variants instead).

Bias, Risks, and Limitations

The model may inherit biases from its training data (BookCorpus and English Wikipedia), potentially reinforcing stereotypes, such as gender or occupational biases. For example:

from transformers import pipeline
unmasker = pipeline('fill-mask', model='boltuix/bert-micro')
unmasker("The man worked as a [MASK].")

Output :

[
  {'sequence': '[CLS] the man worked as a engineer. [SEP]', 'token_str': 'engineer'},
  {'sequence': '[CLS] the man worked as a doctor. [SEP]', 'token_str': 'doctor'},
  ...
]

unmasker("The woman worked as a [MASK].")

Output :

[
  {'sequence': '[CLS] the woman worked as a teacher. [SEP]', 'token_str': 'teacher'},
  {'sequence': '[CLS] the woman worked as a nurse. [SEP]', 'token_str': 'nurse'},
  ...
]

These biases may propagate to downstream tasks. Due to its minimal size (~15 MB), the model is highly efficient but has limited capacity for complex tasks, making it less suitable for applications requiring robust performance.

Recommendations

Users should:

• Conduct bias audits tailored to their application.
• Fine-tune with diverse, representative datasets to reduce bias.
• Apply model compression techniques (e.g., quantization) for deployment on ultra-constrained devices.

How to Get Started with the Model

Use the code below to get started with the model.

from transformers import pipeline, BertTokenizer, BertModel

# Masked Language Modeling
unmasker = pipeline('fill-mask', model='boltuix/bert-micro')
result = unmasker("Hello I'm a [MASK] model.")
print(result)

# Feature Extraction (PyTorch)
tokenizer = BertTokenizer.from_pretrained('boltuix/bert-micro')
model = BertModel.from_pretrained('boltuix/bert-micro')
text = "Replace me by any text you'd like."
encoded_input = tokenizer(text, return_tensors='pt')
output = model(**encoded_input)

Training Details

Training Data

The model was pretrained on:

• BookCorpus : ~11,038 unpublished books, providing diverse narrative text.
• English Wikipedia : Excluding lists, tables, and headers for clean, factual content.

See the BoltUIX Dataset Card for more details.

Training Procedure

Preprocessing

• Texts are lowercased and tokenized using WordPiece with a vocabulary size of 30,000.
• Inputs are formatted as: [CLS] Sentence A [SEP] Sentence B [SEP] .
• 50% of the time, Sentence A and B are consecutive; otherwise, Sentence B is random.
• Masking:
  • 15% of tokens are masked.
  • 80% of masked tokens are replaced with [MASK] .
  • 10% are replaced with a random token.
  • 10% are left unchanged.

Training Hyperparameters

• Training regime: fp16 mixed precision
• Optimizer : Adam (learning rate 1e-4, β1=0.9, β2=0.999, weight decay 0.01)
• Batch size : 32
• Steps : 400,000
• Sequence length : 128 tokens (99% of steps), 512 tokens (1% of steps)
• Warmup : 4,000 steps with linear learning rate decay

Speeds, Sizes, Times

• Training time : Approximately 40 hours
• Checkpoint size : ~15 MB
• Throughput : ~180 sentences/second on TPU infrastructure

Evaluation

Testing Data, Factors & Metrics

Testing Data

Evaluated on the GLUE benchmark, including tasks like MNLI, QQP, QNLI, SST-2, CoLA, STS-B, MRPC, and RTE.

Factors

• Subpopulations : General English text, academic, and professional domains
• Domains : News, books, Wikipedia, scientific articles

Metrics

• Accuracy : For classification tasks (e.g., MNLI, SST-2)
• F1 Score : For tasks like QQP, MRPC
• Pearson/Spearman Correlation : For STS-B

Results

GLUE test results (fine-tuned):

Summary

The model provides moderate performance across GLUE tasks, with acceptable results in SST-2 and QNLI. It is suitable for basic NLP tasks in resource-constrained environments, offering blazing-fast inference with minimal resource usage.

Model Examination

The model’s attention mechanisms were analyzed to ensure minimal but functional contextual understanding, with no significant overfitting observed during pretraining. Ablation studies validated the training configuration for ultra-lightweight performance.

Environmental Impact

Carbon emissions estimated using the Machine Learning Impact calculator from Lacoste et al. (2019) .

• Hardware Type : 1 cloud TPU (4 TPU chips)
• Hours used : 40 hours
• Cloud Provider : Google Cloud
• Compute Region : us-central1
• Carbon Emitted : ~30 kg CO2eq (estimated based on TPU energy consumption and regional grid carbon intensity)

Technical Specifications

Model Architecture and Objective

• Architecture : BERT (transformer-based, bidirectional)
• Objective : Masked Language Modeling (MLM) and Next Sentence Prediction (NSP)
• Layers : 2
• Hidden Size : 128
• Attention Heads : 2

Compute Infrastructure

Hardware

• 1 cloud TPU (4 TPU chips total)

Software

• PyTorch
• Transformers library (Hugging Face)

Citation

BibTeX:

@article{DBLP:journals/corr/abs-1810-04805,
  author    = {Jacob Devlin and Ming{-}Wei Chang and Kenton Lee and Kristina Toutanova},
  title     = {{BERT:} Pre-training of Deep Bidirectional Transformers for Language Understanding},
  journal   = {CoRR},
  volume    = {abs/1810.04805},
  year      = {2018},
  url       = {http://arxiv.org/abs/1810.04805},
  archivePrefix = {arXiv},
  eprint    = {1810.04805}
}

APA: Devlin, J., Chang, M.-W., Lee, K., & Toutanova, K. (2018). BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding. CoRR, abs/1810.04805 . http://arxiv.org/abs/1810.04805

Glossary

• MLM : Masked Language Modeling, where 15% of tokens are masked for prediction.
• NSP : Next Sentence Prediction, determining if two sentences are consecutive.
• WordPiece : Tokenization method splitting words into subword units.

More Information

• See the Hugging Face documentation for advanced usage details.
• Contact: [email protected]

Model Card Authors

• Hugging Face team
• BoltUIX contributors

Model Card Contact

For questions, please contact [email protected] or open an issue on the model repository .