How can I ensure the quality of my synthetic data?

Synthetic data can be used for many purposes, from testing applications to generating “black swan” events that might not be present in historical data. It’s important to consider how a synthetic dataset is created and its quality.

Data quality is critical to a model’s ability to learn the statistical structure and correlations of real-world data. This includes things like the number of unique fields, field lengths, and underlying data types.

Accuracy

As with real-world data, the quality of synthetic datasets depends on the accuracy of the model used to generate them. Organizations can ensure that their generated data meets industry standards by performing quality checks marmitapharma using a combination of manual and automated tools. This can include checking for discrepancies between the synthetic data and the original source data, as well as evaluating the accuracy of specific attributes within the dataset.

A common metric is Histogram Similarity, which measures how closely the distributions of original and synthetic data overlap. A perfect score is 1; a value of 0 indicates no overlap at all.

However, even when using high-quality synthetic data, it’s possible that bias can still creep in. While it’s impossible to eliminate all bias, weeding out the most harmful kinds of bias is essential to make artificial data useful for businesses. This is particularly important when working with sensitive data, such as personal information. It can be easy to link these types of data back to the person it originated from, which could lead to privacy violations and legal issues.

Reliability

Using real data to build a model requires careful sampling and validation. It is also critical that the generated synthetic data replicates the statistical properties of the original dataset. For example, temporal dependencies should be preserved. In health care, patients must follow specific schedules for appointments and diagnostic procedures. And the corresponding timelines need to be replicated in artificial data. Exceptionally long fields in the data can also have a negative impact on a model’s ability to learn its statistical structure.

Using a robust and automated model audit process can detect errors or biases in synthetic data. This can alert a team to the presence of bad inputs or poor data transformations. And prevent the use of incorrect data in testing and training systems. GenRocket’s streamlined process allows agile teams to design the synthetic data they need for maximum test coverage during each sprint. And have it automatically generated on demand as part of their CI/CD pipeline.

Bias

While using synthetic data can be a powerful tool for mitigating bias in machine learning models. It must be done correctly. Poorly generated synthetic data can introduce artificial patterns that distort the underlying distribution and lead to misleading or biased predictions.

To avoid this, organizations should use verification processes that analyze source data for inaccuracies and errors to prevent them from being passed along during the synthesis process. They should also use multiple data sources to ensure that any human bias is not introduced into the artificial data.

Lastly, they should also consider using a synthetic data quality score that compares the statistical distribution of original and synthetic data to assess its utility for machine learning purposes. This metric can be used to measure the overlap of original and artificial  data distributions and identify any differences. It can also be used to evaluate a model’s accuracy by comparing the number of true positives and false negatives in different demographic groups.

Security

Creating synthetic data requires the use of sophisticated, privacy-protecting tools to replace real data with fake data points. This is done through a process known as Gretel Transform. Which removes identifying fields like names from the real-world dataset and replaces them with fabricated ones to generate a new data set. A privacy assurance assessment is then performed. Which determines whether or not any real data can be re-identified from the resulting artificial data set.

Synthetic data enables developers to work on software projects at a pace that isn’t limited by the availability of the right data sets. It also eliminates the need to move real data sets between teams, which often creates security risks and impedes productivity.

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Enterprise synthetic data generation solutions must protect the integrity of the data model. For example, referential integrity must be maintained in a scalable and consistent way for each synthetic test data project. No matter the number of permutations generated and their complexity.