# Problem: feed-forward neural network — the connection between

Problem: feed-forward neural network — the connection between the hidden layer and output layer is removed.

I am facing a strange problem with Matlab and, in particular, with the training of a feed-forward neural network.

In practice, I set the network, which is formed by an input layer, a hidden layer and an output layer. But, when I call the train function, the connection between the hidden layer and the output layer is removed and I do not understand why. I hope someone can help me.

The following is the simple code I use:

`if true`

load fisheriris

feedforwardNetwork = feedforwardnet(10);

feedforwardNetwork.divideFcn = 'dividetrain';

feedforwardNetwork.trainFcn = 'traingd';

feedforwardNetwork.trainParam.epochs = 10;

feedforwardNetwork = train(feedforwardNetwork, meas');

end

# ANSWER

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% Hi Greg and Brendan. Thanks for your reply. % % Well, after struggling reading the **Matlab documentation**, % I think I understood what the problem was. % % The code I posted was just a dummy example to explain the % issue I was facing. My real problem is the following: I am % trying to solve an anomaly detection problem and, in % particular, reading sensor data, I am trying to detect when % there is an anomaly behavior. % % In order to do so, I am using different machine learning % algorithms and evaluating their performance. So far, I have % used the nearest neighbor algorithm, the self-organizing maps % and the support vector machines. Another “instrument” I would % like to use is that of neural networks.

`Your problem is that you did not do the following:`

1. Identify the problem as one of the following

a. regression/curvefitting

b. classification/patternrecognition

c. clustering

d. time-series 2. Search both NEWSGROUP and ANSWERS using

a. classification

b. pattern-recognition to identify

a. classification/pattern-recognition functions

(e.g., patternnet)

b. example classification/pattern-recognition code

and data examples 3. Practice using one or more of the MATLAB classification/...

pattern-recognition example data obtained from help nndata

doc nndata

5. Apply what is learned above on your dataset.

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