unidq 0.1.2

Unified Transformer for Multi-Task Data Quality

UNIDQ: Unified Data Quality

A unified transformer architecture for multi-task data quality assessment.

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🎯 Overview

UNIDQ (Unified Data Quality) is a deep learning framework that addresses multiple data quality challenges with a single, efficient model. Unlike traditional approaches that require separate tools for each task (Raha for error detection, MICE for imputation, Cleanlab for label noise), UNIDQ handles 6 data quality tasks simultaneously using a unified transformer architecture.

Why UNIDQ?

Traditional Approach	UNIDQ Approach
Multiple separate tools	Single unified model
Tool-specific configurations	Configuration-free
No knowledge sharing between tasks	Multi-task learning with shared representations
High cumulative overhead	495K parameters total

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✨ Features

UNIDQ addresses 6 data quality tasks with a single model:

Task	Description	Output
✅ Error Detection	Identify erroneous values in your data	Binary mask of errors
✅ Data Repair	Suggest corrections for detected errors	Repaired values
✅ Missing Value Imputation	Fill in missing values intelligently	Imputed values
✅ Label Noise Detection	Find mislabeled samples	Noise probability scores
✅ Label Classification	Predict labels for downstream tasks	Class predictions
✅ Data Valuation	Score each sample's quality/usefulness	Quality scores [0-1]

Architecture Highlights

• Three-Tier Attention: Cell-level → Row-level → Column-level attention for comprehensive data understanding
• Task-Specific LoRA Adapters: Efficient fine-tuning with minimal parameters
• Nash Multi-Task Learning: Balanced optimization across all tasks
• Lightweight Design: Only 495K parameters

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📦 Installation

From PyPI (Recommended)

pip install unidq

From Source

git clone [git_loc]
cd unidq
pip install -e .

Dependencies

• Python >= 3.8
• PyTorch >= 1.9
• NumPy >= 1.19
• scikit-learn >= 0.24
• pandas >= 1.2

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🚀 Quick Start

Basic Usage

from unidq import UNIDQ, MultiTaskDataset, UNIDQTrainer

# Prepare your data
# X_dirty: DataFrame or array with potential errors
# X_clean: Ground truth clean data (for training)
# error_mask: Binary mask indicating errors (1 = error, 0 = clean)
# labels: Target labels for classification

# Create dataset
dataset = MultiTaskDataset(
    dirty_features=X_dirty,
    clean_features=X_clean,
    error_mask=error_mask,
    labels=labels
)

# Initialize model
model = UNIDQ(n_features=X_dirty.shape[1])

# Train
trainer = UNIDQTrainer(model)
trainer.fit(dataset, epochs=50)

# Get predictions
results = model.predict(X_new)

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📖 Detailed Usage

1. Error Detection

Detect erroneous values in your dataset:

from unidq import UNIDQ, ErrorDetector

# Load pre-trained model or train your own
model = UNIDQ(n_features=10)
model.load_pretrained('path/to/checkpoint.pt')

# Detect errors
error_predictions = model.detect_errors(X_dirty)

# Returns: dict with
#   - 'predictions': Binary array (1 = error)
#   - 'probabilities': Confidence scores
#   - 'error_indices': List of (row, col) tuples

print(f"Found {error_predictions['predictions'].sum()} errors")
print(f"Error locations: {error_predictions['error_indices'][:5]}")

2. Data Repair

Automatically repair detected errors:

# Detect and repair in one step
repaired_data, repair_report = model.detect_and_repair(X_dirty)

# Or repair specific cells
repairs = model.repair(
    X_dirty, 
    error_mask=error_predictions['predictions']
)

print(f"Repaired {len(repair_report)} values")
print(f"Sample repairs: {repair_report[:3]}")

3. Missing Value Imputation

Handle missing values intelligently:

import numpy as np

# Create data with missing values
X_missing = X_dirty.copy()
X_missing[np.isnan(X_missing)] = np.nan  # or use None for DataFrames

# Impute missing values
X_imputed = model.impute(X_missing)

# Get imputation confidence
imputed_values, confidence = model.impute(X_missing, return_confidence=True)

print(f"Imputed {np.isnan(X_missing).sum()} missing values")
print(f"Average confidence: {confidence.mean():.3f}")

4. Label Noise Detection

Identify potentially mislabeled samples:

# Detect noisy labels
noise_scores = model.detect_label_noise(X, y)

# Returns: dict with
#   - 'noise_probabilities': P(label is wrong) for each sample
#   - 'predicted_clean_labels': What the label should be
#   - 'flagged_indices': Samples with noise_prob > threshold

# Find suspicious samples
threshold = 0.5
suspicious = noise_scores['noise_probabilities'] > threshold
print(f"Found {suspicious.sum()} potentially mislabeled samples")

# Review flagged samples
for idx in noise_scores['flagged_indices'][:5]:
    print(f"Sample {idx}: current={y[idx]}, suggested={noise_scores['predicted_clean_labels'][idx]}")

5. Data Valuation

Score the quality and usefulness of each sample:

# Get quality scores for each sample
quality_scores = model.valuate(X, y)

# Returns: array of scores in [0, 1]
#   - 1.0 = high quality, useful sample
#   - 0.0 = low quality, potentially harmful sample

# Use for data selection
high_quality_mask = quality_scores > 0.7
X_clean = X[high_quality_mask]
y_clean = y[high_quality_mask]

print(f"Kept {high_quality_mask.sum()}/{len(X)} high-quality samples")
print(f"Quality distribution: min={quality_scores.min():.3f}, max={quality_scores.max():.3f}")

6. Full Pipeline (All Tasks)

Run all tasks in one call:

# Comprehensive data quality assessment
results = model.assess_quality(
    X_dirty,
    labels=y,
    tasks=['error_detection', 'repair', 'imputation', 'noise_detection', 'valuation']
)

# Access results
print("=== Data Quality Report ===")
print(f"Errors detected: {results['error_detection']['count']}")
print(f"Values repaired: {results['repair']['count']}")
print(f"Missing imputed: {results['imputation']['count']}")
print(f"Noisy labels: {results['noise_detection']['count']}")
print(f"Avg quality score: {results['valuation']['mean']:.3f}")

# Get cleaned data
X_cleaned = results['cleaned_data']
y_cleaned = results['cleaned_labels']

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⚙️ Advanced Configuration

Custom Model Configuration

from unidq import UNIDQ, UNIDQConfig

# Configure model architecture
config = UNIDQConfig(
    d_model=128,           # Embedding dimension
    n_heads=4,             # Attention heads
    n_layers=3,            # Transformer layers
    dropout=0.1,           # Dropout rate
    use_lora=True,         # Enable LoRA adapters
    lora_rank=8,           # LoRA rank
    task_weights={         # Custom task weights
        'error_detection': 1.0,
        'repair': 0.5,
        'imputation': 0.5,
        'noise_detection': 1.0,
        'classification': 0.3,
        'valuation': 0.3
    }
)

model = UNIDQ(n_features=20, config=config)

Training Configuration

from unidq import UNIDQTrainer, TrainingConfig

# Configure training
train_config = TrainingConfig(
    batch_size=64,
    learning_rate=1e-3,
    max_epochs=100,
    early_stopping_patience=10,
    optimizer='adamw',
    scheduler='cosine',
    gradient_clip=1.0,
    validation_split=0.15
)

trainer = UNIDQTrainer(model, config=train_config)

# Train with callbacks
trainer.fit(
    dataset,
    callbacks=[
        EarlyStoppingCallback(patience=10),
        ModelCheckpointCallback(save_path='checkpoints/'),
        TensorBoardCallback(log_dir='logs/')
    ]
)

Working with Pandas DataFrames

import pandas as pd
from unidq import UNIDQ

# Load your data
df_dirty = pd.read_csv('dirty_data.csv')
df_clean = pd.read_csv('clean_data.csv')  # Optional, for training

# UNIDQ handles DataFrames directly
model = UNIDQ.from_dataframe(df_dirty)

# Or specify column types
model = UNIDQ.from_dataframe(
    df_dirty,
    numerical_columns=['age', 'salary', 'score'],
    categorical_columns=['city', 'department', 'status'],
    label_column='target'
)

# Detect errors
errors = model.detect_errors(df_dirty)

# Get cleaned DataFrame
df_cleaned = model.clean(df_dirty)
df_cleaned.to_csv('cleaned_data.csv', index=False)

Loading Benchmark Datasets

from unidq.datasets import load_benchmark

# Load a benchmark dataset
data = load_benchmark('beers')

print(f"Dirty data shape: {data['dirty'].shape}")
print(f"Clean data shape: {data['clean'].shape}")
print(f"Error rate: {data['error_mask'].mean():.2%}")

# Available datasets
from unidq.datasets import list_benchmarks
print(list_benchmarks())
# ['beers', 'flights', 'rayyan', 'hospital', 'tax', ...]

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🔬 API Reference

Core Classes

Class	Description
UNIDQ	Main model class
MultiTaskDataset	Dataset wrapper for training
UNIDQTrainer	Training loop handler
UNIDQConfig	Model configuration
TrainingConfig	Training configuration

UNIDQ Methods

Method	Description	Returns
detect_errors(X)	Detect erroneous values	Dict with predictions, probabilities
repair(X, error_mask)	Repair detected errors	Repaired array
impute(X)	Impute missing values	Imputed array
detect_label_noise(X, y)	Find mislabeled samples	Dict with noise scores
valuate(X, y)	Score sample quality	Quality scores array
assess_quality(X, y)	Run all tasks	Comprehensive report dict
predict(X)	Get all predictions	Dict with all outputs
fit(dataset)	Train the model	self
save(path)	Save model checkpoint	None
load(path)	Load model checkpoint	self

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🧪 Examples

Example 1: Cleaning a Messy CSV

import pandas as pd
from unidq import UNIDQ

# Load messy data
df = pd.read_csv('messy_customer_data.csv')

# Initialize and run UNIDQ
model = UNIDQ.from_dataframe(df)
report = model.assess_quality(df)

# Print summary
print(f"Found {report['total_issues']} data quality issues:")
print(f"  - {report['error_detection']['count']} errors")
print(f"  - {report['imputation']['count']} missing values")
print(f"  - {report['noise_detection']['count']} suspicious labels")

# Save cleaned data
report['cleaned_data'].to_csv('clean_customer_data.csv', index=False)

Example 2: Training on Custom Data

from unidq import UNIDQ, MultiTaskDataset, UNIDQTrainer
from sklearn.model_selection import train_test_split

# Prepare data
X_train, X_val, y_train, y_val = train_test_split(X, y, test_size=0.2)

# Create datasets
train_dataset = MultiTaskDataset(
    dirty_features=X_train_dirty,
    clean_features=X_train_clean,
    error_mask=train_errors,
    labels=y_train
)

val_dataset = MultiTaskDataset(
    dirty_features=X_val_dirty,
    clean_features=X_val_clean,
    error_mask=val_errors,
    labels=y_val
)

# Train
model = UNIDQ(n_features=X.shape[1])
trainer = UNIDQTrainer(model)
history = trainer.fit(train_dataset, val_dataset=val_dataset, epochs=50)

# Plot training curves
trainer.plot_history(history)

# Save model
model.save('my_unidq_model.pt')

Example 3: Integration with Scikit-learn

from unidq import UNIDQTransformer
from sklearn.pipeline import Pipeline
from sklearn.ensemble import RandomForestClassifier

# Create sklearn-compatible transformer
unidq_transformer = UNIDQTransformer(
    tasks=['error_detection', 'repair', 'imputation']
)

# Build pipeline
pipeline = Pipeline([
    ('data_quality', unidq_transformer),
    ('classifier', RandomForestClassifier())
])

# Fit and predict
pipeline.fit(X_train, y_train)
predictions = pipeline.predict(X_test)

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🤝 Contributing

We welcome contributions! Please see our Contributing Guide for details.

# Clone the repo
git clone 
cd unidq

# Install dev dependencies
pip install -e ".[dev]"

# Run tests
pytest tests/

# Run linting
flake8 unidq/
black unidq/

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📄 Citation

If you use UNIDQ in your research, please cite our paper:

@inproceedings{unidq2026,
  title={UNIDQ: A Unified Transformer Architecture for Multi-Task Data Quality},
  author={Koreddi, Shiva and Sowrupilli, Sravani},
  booktitle={Proceedings of the VLDB Endowment},
  year={2026},
  publisher={VLDB Endowment}
}

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📜 License

This project is licensed under the MIT License - see the LICENSE file for details.

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Acknowledgments

• Built with PyTorch
• Inspired by research in data quality and multi-task learning

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📧 Contact

• Issues: [GitHub Issues]
• Email: [e-mail]

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Made with ❤️ for the data quality community