1. VisTrails: Overview Juliana Freire University of Utah http://www.vistrails.org Joint work with: Erik Andersen, Steven P. Callahan, David Koop, Emanuele Santos, Carlos E. Scheidegger, Claudio Silva and Huy T. Vo

2. 2007 2 VisTrails: An Overview VisTrails: Managing Provenance u Provenance of computational artifacts is necessary to reproduce, validate and share scientific results

3. 2007 3 VisTrails: An Overview VisTrails: Managing Provenance u Provenance of computational artifacts is necessary to reproduce, validate and share scientific results u VisTrails provides comprehensive provenance infrastructure for computational tasks –Provenance is captured transparently –Efficient storage and intuitive query interfaces for exploring provenance data –Support for collaboration u Designed to support exploratory tasks such as visualization and data mining –Task specification iteratively refined as users generate and test hypotheses u VisTrails is open source: www.vistrails.org

4. 2007 4 VisTrails: An Overview Provenance for Workflows u Treat a workflow (computational task)as a first- class data product u In exploratory tasks, series of workflows are created and refined: change is the norm u Keep exploration trail Provenance can be as important as the results! (Freire et al., IPAW 2006)

5. 2007 5 VisTrails: An Overview Keeping Scientific Exploration Trails Trail Workflows u Uniformly captures data and workflow provenance –Data provenance: where does a specific data product come from? –Workflow evolution: how has workflow structure changed over time?

6. 2007 6 VisTrails: An Overview Keeping Scientific Exploration Trails Trail Initial visualization with z-scaling corrected Notes Added texture and shading Added plane to visualize internal structure Found good transfer function Identified lesion tissue User juliana eranders stevec

7. 2007 7 VisTrails: An Overview Provenance Beyond Reproducibility Scalable exploration of parameter spaces Visual comparison of workflows and data products Query workflows by example

8. 2007 8 VisTrails: An Overview Querying Workflows u Workflows are graphs: hard to specify queries using text u Querying workflows by example –WYSIWYQ -- What You See Is What You Query –Interface to create workflow is same as to query (Scheidegger et al., TVCG 2007)

9. 2007 9 VisTrails: An Overview Creating Workflows by Analogy u Simplify creation of workflows u Use the wisdom of the crowds –Some workflow refinements are common, e.g., change the rendering technique, publish image on the Web u Apply refinements by analogy, automatically Source Target (Scheidegger et al., TVCG 2007)

10. 2007 10 VisTrails: An Overview Integrating Tools and Libraries SCIRun in VisTrails Workflow that combines 5 different libraries VisTrails add-on for ParaView

11. 2007 11 VisTrails: An Overview Applications and Users Psychiatry-U of Utah

12. 2007 12 VisTrails: An Overview Applications and Users Physics-Cornell

13. 2007 13 VisTrails: An Overview Applications and Users Environmental Science-OHSU

14. 2007 14 VisTrails: An Overview Acknowledgments u This work is partially supported by the National Science Foundation, the Department of Energy, an IBM Faculty Award, and a University of Utah Seed Grant.

15. 2007 15 VisTrails: An Overview More info about VisTrails google vistrails Or http://www.vistrails.org