Knowledge Engineering

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Presentation transcript:

Knowledge Engineering Representation Probabilistic Graphical Models Wrapup Knowledge Engineering

Important Distinctions Template based versus specific Directed versus undirected Generative versus discriminative Hybrids are also common

Important Distinctions Template-based Specific

Important Distinctions Generative Discriminative

Variable Types Target Observed Latent Including complex, constructed features Latent GMT W1 W2 W3 Wk …

Structure Causal versus non-causal ordering … … GMT W1 W2 W3 Wk GMT W1

Extending the Conversation

Parameters: Values What matters: Structured CPDs Zeros Orders of magnitude Relative values Structured CPDs

Parameters: Local Structure Table CPDs are the exception Context-specific Aggregating Discrete Continuous

Iterative Refinement Model testing Sensitivity analysis for parameters Error analysis Add features Add dependencies

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