Multi Table API

The Multi Table Quality Report evaluates how well your synthetic data captures mathematical properties in your data:

Use this report when you have multiple, connected tables of data.


Generating the report


Create your report object by importing it from the multi table reports module.

from sdmetrics.reports.multi_table import QualityReport

report = QualityReport()

generate(real_data, synthetic_data, metadata)

Generate your report by passing in the data and metadata.

  • (required) real_data: A dictionary mapping the name of each table to a pandas.DataFrame containing the real data for that table

  • (required) synthetic_data: A dictionary mapping the name of each table to a pandas.DataFrame containing the synthetic data for that table

  • (required) metadata: A dictionary describing the format, types of data and relationship between the tables. See Multi Table Metadata for more details.

  • verbose: A boolean describing whether or not to print the report progress and results. Defaults to True. Set this to False to run the report silently.

report.generate(real_data, synthetic_data, metadata)

Once completed, some preliminary scores will be printed out.

Generating report ...
(1/4) Evaluating Column Shapes: : 100%|██████████| 13/13 [00:00<00:00, 338.47it/s]
(2/4) Evaluating Column Pair Trends: : 100%|██████████| 22/22 [00:00<00:00, 95.98it/s]
(3/4) Evaluating Cardinality: : 100%|██████████| 2/2 [00:00<00:00, 69.99it/s]
(4/4) Evaluating Intertable Trends: : 100%|██████████| 36/36 [00:00<00:00, 111.46it/s]

Overall Quality Score: 62.49%

- Column Shapes: 79.23%
- Column Pair Trends: 42.5%
- Cardinality: 80.0%
- Intertable Trends: 48.24%

Getting & explaining the results

Every score that the report generates ranges from 0 (worst) to 1 (best)


Use this method at any point to retrieve the overall score.

Returns: A floating point value between 0 and 1 that summarizes the quality of your synthetic data.



Use this method at any point to retrieve each property that the report evaluated

Returns: A pandas.DataFrame that lists each property name and its associated score

Property                        Score
Column Shapes                   0.792262
Column Pair Trends              0.424967
Cardinality                     0.800000
Intertable Trends               0.482407

get_details(property_name, table_name)

Use this method to get more details about a particular property.

  • (required) property_name: A string with the name of the property. One of: 'Column Shapes', 'Column Pair Trends', 'Cardinality' or 'Intertable Trends'

  • table_name: A string with the name of the table. If provided, you'll receive filtered results for the table.

Returns: A pandas.DataFrame that returns more details about the property for the given table

For example, the details for 'Column Shapes' shows the name of each individual column, the metric that was used to compute it and the overall score for that column.

    property_name='Column Shapes',
Table        Column         Metric         Score
users        purchase_amt   KSComplement   0.880
users        card_type      TVComplement   0.690
users        start_date     KSComplement   0.790

Visualizing the report

You can visualize the properties and use the SDMetrics utilities to visualize the raw data too.

get_visualization(property_name, table_name)

Use this method to visualize the details about a property.

  • (required) property_name: A string with the name of the property. One of: 'Column Shapes', 'Column Pair Trends', 'Cardinality' or 'Intertable Trends'

  • (required) table_name: A string with the name of the table

Returns: A plotly.Figure object

fig = report.get_visualization(
    property_name='Column Shapes',

The exact visualization is based on the property. For example, 'Column Shapes' property visualizes the quality score for every column as well as the metric used to compute it.

Other visualizations are available! Use the SDMetrics Visualization Utilities to get more insights into your data. Tip: All visualizations returned in this report are interactive. If you're using an iPython notebook, you can zoom, pan, toggle legends and take screenshots.

Saving & loading the report

You can save your report if you want to share or access it in the future.


Save the Python report object

  • (required) filepath: The name of file to save the object. This must end with .pkl'results/quality_report.pkl')

The report does not save the full real and synthetic datasets, but it does save the metadata along with the score for each property, breakdown and metric.

The score information may still leak sensitive details about your real data. Use caution when deciding where to store the report and who to share it with.


Load the report from the file

  • (required) filepath: The name of the file where the report is stored

Returns: A QualityReport object.

from sdmetrics.reports.multi_table import QualityReport

report = QualityReport.load('results/quality_report.pkl')


What is the best way to see the visualizations? Can I save them?

This report returns all visualizations as plotly.Figure object, which are integrated with most iPython notebooks (eg. Colab, Jupyter).

Tip! You can interact with the visualizations when you're viewing them in a notebook. You can zoom, pan and take screenshots.

It's also possible to programmatically save a static image export. See the Plotly Guide for more details.

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