bertnado 0.1.5

BertNado: A framework for training and evaluating transformer-based models for Chromatin binding

BertNado

BertNado is a modular framework for fine-tuning Hugging Face DNA language models such as GROVER, NT2, and DNABERT variants on genomic prediction tasks. It supports both full fine-tuning and parameter-efficient transfer learning (PEFT) strategies like LoRA.

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Features

• Model Support: GROVER, NT2 (Nucleotide Transformer), DNABERT, and other Hugging Face-compatible DNA language models
• Task Flexibility: Supports regression, binary, and multi-label classification, as well as masked DNA modeling
• Chromosome-aware Splits: Train/val/test split by chromosome to prevent data leakage
• Efficient Fine-tuning: Drop-in support for parameter-efficient tuning methods like LoRA
• Hyperparameter Optimization: Integrated with Weights & Biases for Bayesian sweep-based tuning
• Robust Evaluation: Automatically generates ROC, PR, and confusion matrix plots for binary classification
• Model Interpretation: SHAP and Captum Layer Integrated Gradients (LIG) for biological insight
• Trainer Integration: Built on Hugging Face Trainer with custom heads and metrics
• W&B Logging: Full experiment tracking with Weights & Biases out of the box

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Installation

git clone https://github.com/CChahrour/BertNado.git
cd BertNado
pip install -e .

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Project Structure

bertnado/
├── cli.py                      # Command-line interface
├── data/
│   └── prepare_dataset.py      # Dataset creation and tokenization
├── evaluation/
│   ├── predict.py              # Predict from trained models
│   └── feature_extraction.py   # SHAP / LIG-based interpretation
└── training/
    ├── finetune.py             # Fine-tuning using best config
    ├── full_train.py           # Full training loop
    ├── model.py                # PEFT/LoRA model architecture
    ├── sweep.py                # W&B sweep setup
    ├── trainers.py             # Trainer wrappers
    └── metrics.py              # Metric computation

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Quickstart

Step 1: Prepare Dataset

bertnado-data \
  --file-path test/data/mock_data.parquet \
  --target-column bound \
  --fasta-file test/data/mock_genome.fasta \
  --tokenizer-name PoetschLab/GROVER \
  --output-dir output/dataset \
  --task-type binary_classification \
  --threshold 0.5

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Step 2: Run Hyperparameter Sweep

bertnado-sweep \
  --config-path test/data/mock_sweep_config.json \
  --output-dir output/sweep \
  --model-name PoetschLab/GROVER \
  --dataset output/dataset \
  --sweep-count 2 \
  --project-name project \
  --metric-name eval/roc_auc \
  --metric-goal maximize \
  --task-type binary_classification

--config-path points to a Weights & Biases sweep config. The sweep metric is also used to choose the best checkpoint inside each run.

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Step 3: Train Best Model

bertnado-train \
  --output-dir output/train \
  --model-name PoetschLab/GROVER \
  --dataset output/dataset \
  --best-config-path output/sweep/best_sweep_config.json \
  --task-type binary_classification \
  --project-name project \
  --metric-name eval/roc_auc \
  --metric-goal maximize

The metric flags are optional when best_sweep_config.json was produced by bertnado-sweep, because the resolved metric is saved in that file.

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Step 4: Predict on Test Set

bertnado-predict \
  --tokenizer-name PoetschLab/GROVER \
  --model-dir output/train/model \
  --dataset-dir output/dataset \
  --output-dir output/predictions \
  --task-type binary_classification

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Step 5: Interpret Model with SHAP or LIG

bertnado-feature \
  --tokenizer-name PoetschLab/GROVER \
  --model-dir output/train/model \
  --dataset-dir output/dataset \
  --output-dir output/feature_analysis \
  --task-type binary_classification \
  --method shap \
  --target-class 1

Run both SHAP and LIG:

--method both --target-class 1

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Outputs

• Figures saved to output/figures/

  • Binary classification: ROC and precision-recall curves
  • Binary classification: Confusion matrix

• SHAP scores saved to output/shap/

• Trained models saved to output/models/

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Interpretation Tools

• SHAP: Global and local token importance
• Captum LIG: Gradient-based token attribution at the embedding level

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Acknowledgements

• Hugging Face Transformers
• PoetschLab/GROVER
• PEFT/LoRA
• SHAP & Captum for interpretability
• crested for efficient sequence extraction

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