Artificial intelligence
A heuristic is a way of trying __________

All of the mentioned
To compare two nodes in a search tree to see if one is better than the other is
To search and measure how far a node in a search tree seems to be from a goal
To discover something or an idea embedded in a program

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Artificial intelligence
What is perceptron?

an auto-associative neural network
a single layer feed-forward neural network with pre-processing
a double layer auto-associative neural network
a neural network that contains feedback

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