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Default function in Neural Networks

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Contributor
Posts: 42

Default function in Neural Networks

Dear Members,

I have used a Neural Networks in EM for classification problem with default options. I want to know the default options of:

Hidden/Target layer combination function.

Hidden/Target layer activation function.

Thanks

SAS Employee
Posts: 15

Re: Default function in Neural Networks

If you are using the Neural Network Node in Enterprise Miner with the defaults it will run the neural network with the Multilayer Perceptron architecture and 3 hidden units. You can check this in the Node Results, by looking at the log and seeing if the proc neural call uses "arch MLP Hidden = 3"

For Multilayer Perceptron (default setting in Enterprise Miner):

Hidden layer activation function     = tanh

Hidden layer combination function = linear

The default target layer activation and combination functions are a bit more complicated, as it depends on the level of the target variable itself:

Target layer activation function      = identity (if LEVEL = INTERVAL)

                                                 = logistic (if LEVEL = ORDINAL)

                                                 = mlogistic (if LEVEL = NOMINAL)

Target layer combination function  = linear

I hope this helps. Most of this information came from the proc neural documentation if you care for further reading.

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