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Limitations – emulation. Suitability for models. Must be deterministic. If stochastic then noise must be approximately Gaussian distributed with constant variance (nugget). Some models can’t be emulated. Discontinuous response, huge input / output space. No support for spatial models.

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Limitations emulation
Limitations – emulation

  • Suitability for models.

    • Must be deterministic.

      • If stochastic then noise must be approximately Gaussian distributed with constant variance (nugget).

    • Some models can’t be emulated.

      • Discontinuous response, huge input / output space.

    • No support for spatial models.

  • Input variable type support.

    • Currently only continuous.

    • Integeris possible but not implemented.

    • Discrete/categorical support is possible but requires changes to emulation code.


Limitations web application
Limitations – Web application

  • Requires your model to be exposed on the Web.

    • Only using a supported interface!

  • Data encoding support.

    • The models we’ve been using only have double input and output values.

    • Challenges with complex data types such as O&M.


Limitations web application1
Limitations – Web application

  • Web service interface support.

    • Not all of the WPS specification is supported.

    • Only some SOAP/WSDL services are compatible.

      • Includes all processes exposed using the UncertWeb Processing Service framework.

  • Conditional input specifications.

    • Cannot specify a design where input X1 > X2, for example.


Summary
Summary

  • Performing sensitivity analysis can help to understand your model / workflow.

  • Building emulators can greatly speed up multiple model runs required for sensitivity and uncertainty analysis.

  • We have built open source tools to make this possible in the Model Web.

    • Source code: http://github.com/itszootime

The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [248488].


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