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Programmatic Task Network Planning: Extending Hierarchical HTN For Service Composition.pdf

Mohr18ProgrammaticPlanning.pdf
Preview of Programmatic Task Network Planning: Extending Hierarchical HTN for Service Composition
🔗 Source: icaps18.icaps-conference.org
📊 Size: 341 KB
📄 Pages: 9 pages
⬇️ Downloads: 39

Summary

Allowing Output from Operations and Methods: PTN expands traditional HTN by enabling operations and methods to produce outputs, not just inputs.

2. Integrating Interpreted Predicates: Formulas within PTN can include interpreted terms, specifically interpreted predicates evaluated using external theories.

3. Introducing Oracle Tasks: PTN supports a new task type, oracle tasks, handled by external libraries rather than the planner itself, similar to external calls in SHOP2 but more formally defined.

Motivation: Automated Machine Learning

The authors motivate their approach through its application to automated machine learning (AutoML). AutoML aims to automate the process of developing tailored ML pipelines for specific datasets. PTN can represent this as a hierarchical task network, where tasks like "classify" are refined recursively by adding preprocessing steps and algorithm choices.

Case Study: Binary Classification with Nested Dichotomies

The paper illustrates PTN's utility using a simplified AutoML problem: training a multi-class classifier. It demonstrates how nested dichotomies (NDs), represented as binary trees, can be used to break down the classification task into smaller, manageable binary classification problems.

Benefits and Contributions:

The authors aim to determine if PTN offers practical advantages in terms of problem expression compactness and planning efficiency. The case study contributes a real-world application of AI planning to AutoML.

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Description

Programmatic Task Network Planning extends classical HTN planning by allowing output parameters for operations and methods, incorporating interpreted terms with external library evaluation, and enabling flexible modeling for complex applications like automated service composition.

Technical Information

  • File Format: PDF
  • File Size: 341 KB
  • Pages: 9
  • Language: EN
  • Total Downloads: 39
  • Last Updated: 6 hours ago

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