6. Compile And Run

Compile and Run. No change. Good!

Don’t think of an elephant! (ii) The TActivation class

How to implement the sigmoid? B3=IF(A3<=0.5,A3,1.0-A3)

[object Object],[object Object],[object Object]

Class Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Bureaucratic stuff

So OUR own code for “activation.increase” should be a Strategy Pattern ,[object Object],[object Object],[object Object],[object Object]

Advantages of a strategy pattern ,[object Object],[object Object]

[object Object],[object Object]

How do we change a method to a strategy pattern? ,[object Object]

1. Create an interface that defines the strategic operation ,[object Object],[object Object],[object Object]

How do we change a method to a strategy pattern? ,[object Object],[object Object]

2. Implement the interface with classes that represent each strategy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How do we change a method to a strategy pattern? ,[object Object],[object Object],[object Object]

3. Refactor the code to select and to use an instance of the right strategic class ,[object Object],[object Object]

(3.2) Now on to include methods to set_activation_sigmoid, or set_activation_linear; hence we include in the TActivation Class: ,[object Object]

[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object]

Let’s do classes for nodes and for links ,[object Object],[object Object],[object Object],[object Object],[object Object]

TLINK.Create_Link (Node1, Node2, Link_Type, Link_Distance, etc.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Rewriting… if spread_activation belongs to NODES… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

OR…if spread_activation belongs to LINKS… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

NODES Activation Data Data … Method Method Method … LINKS Distance Data Data … Method Method Method … The classes become strongly coupled. It will be very hard to change them in 2010. Practically impossible to include new links at runtime.

Welcome to the observer pattern! Can you imagine calling a method without knowing which method from which object you are calling?

How could we include a new display if they have all been hardcoded? By changing this code? That would be bad! We don’t want to change code. What if we want to include a new display during runtime?

So here's what the design looks like: ,[object Object],[object Object],Node= subject/publisher Links=observers

So here's what the design looks like: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Node= subject/publisher Links=observers

NODES implement: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Links implement: ,[object Object],[object Object]

6. Compile And Run

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6. Compile And Run