What is the format of training data in pyfann?

Question

What is the format of thraining data in pyfann? Concretely I would like to use the init_weight function of pyfann, but it does not take a range, but finds the range from traning data. Therefore I would like to create a small fake dataset, which has the lowest and the highes value of what can be expected in the programm.

Answer 1

Frist Line, 3 arguments: number of data to train, number of inputs, number of outputs from there, goes one line of inputs and one of outputs e.g. (AND logic matrix):

4 2 1    
1 1    
1    
0 1    
0    
0 0    
0    
1 0    
0  

Above:

• 4 datas to train:

  1 AND 1 = 1
  0 AND 1 = 0
  0 AND 0 = 0
  1 AND 0 = 0

• 2 inputs

• 1 output

Answer 2

Now you can also use train_on_data, which receives the same arguments as train_on_file, but you change the filename with an object libfann.training_data() and set the lists of lists of input and output as (for the xor case):

training = libfann.training_data()    
training.set_train_data([[-1,-1],[-1,1],[1,-1],[1,1]],[[-1],[1],[1],[-1]])

Answer 3

you might find help on this page.

http://leenissen.dk/fann/html/files2/gettingstarted-txt.html#Execution

half-way down the page there is a description of the training data format.