neuroflow

extern crate neuroflow;

use neuroflow::FeedForward;
use neuroflow::data::DataSet;
use neuroflow::activators::Type::Tanh;


fn main(){
    /*
        Define a neural network with 1 neuron in input layers. The network contains 4 hidden layers.
        And, such as our function returns a single value, it is reasonable to have 1 neuron in the output layer.
    */
    let mut nn = FeedForward::new(&[1, 7, 8, 8, 7, 1]);
    
    /*
        Define DataSet.
        
        DataSet is the Type that significantly simplifies work with neural networks.
        The majority of its functionality is still under development :(
    */
    let mut data: DataSet = DataSet::new();
    let mut i = -3.0;
    
    // Push the data to DataSet (method push accepts two slices: input data and expected output)
    while i <= 2.5 {
        data.push(&[i], &[0.5*(i.exp().sin()) - (-i.exp()).cos()]);
        i += 0.05;
    }
    
    // Here, we set the necessary parameters and train the neural network by our DataSet with 50 000 iterations
    nn.activation(Tanh)
        .learning_rate(0.01)
        .train(&data, 50_000);

    let mut res;
    
    // Let's check the result
    i = 0.0;
    while i <= 0.3{
        res = nn.calc(&[i])[0];
        println!("for [{:.3}], [{:.3}] -> [{:.3}]", i, 0.5*(i.exp().sin()) - (-i.exp()).cos(), res);
        i += 0.07;
    }
}

Expected output

for [0.000], [-0.120] -> [-0.119]
for [0.070], [-0.039] -> [-0.037]
for [0.140], [0.048] -> [0.050]
for [0.210], [0.141] -> [0.141]
for [0.280], [0.240] -> [0.236]

But we don't want to lose our trained network so easily. So, there is functionality to save and restore neural networks from files.

    /*
        In order to save neural network into file call function save from neuroflow::io module.
        
        The first argument is the link to the saving neural network;
        The second argument is the path to the file. 
    */
    neuroflow::io::save(&mut nn, "test.flow").unwrap();
    
    /*
        After we have saved the neural network to the file we can restore it by calling
        of load function from neuroflow::io module.
        
        We must specify the type of new_nn variable.
        The only argument of the load function is the path to a file containing
        the neural network
    */
    let mut new_nn: FeedForward = neuroflow::io::load("test.flow").unwrap();

Classic XOR problem (with no classic input of data)

Let's create a file named TerribleTom.csv at the root of the project. This file should have the following innards:

0,0,-,0
0,1,-,1
1,0,-,1
1,1,-,0

where - is the delimiter that separates the input vector from its desired output vector.

extern crate neuroflow;

use neuroflow::FeedForward;
use neuroflow::data::DataSet;
use neuroflow::activators::Type::Tanh;


fn main(){
    /*
        Define a neural network with 2 neurons in input layers,
        1 hidden layer (with 2 neurons),
        1 neuron in the output layer
    */
    let mut nn = FeedForward::new(&[2, 2, 1]);
    
    // Here we load data for XOR from the file `TerribleTom.csv`
    let mut data = DataSet::from_csv("TerribleTom.csv");
    
    // Set parameters and train the network
    nn.activation(Tanh)
        .learning_rate(0.1)
        .momentum(0.15)
        .train(&data, 20_000);

    let mut res;
    let mut d;
    for i in 0..data.len(){
        res = nn.calc(data.get(i).0)[0];
        d = data.get(i);
        println!("for [{:.3}, {:.3}], [{:.3}] -> [{:.3}]", d.0[0], d.0[1], d.1[0], res);
    }
}

Expected output

for [0.000, 0.000], [0.000] -> [0.000]
for [1.000, 0.000], [1.000] -> [1.000]
for [0.000, 1.000], [1.000] -> [1.000]
for [1.000, 1.000], [0.000] -> [0.000]

Installation

Insert into your project's cargo.toml block next line

[dependencies]
neuroflow = "~0.2"

Then in project root file

extern crate neuroflow;

License

MIT License

Attribution

The origami bird from the logo is made by Freepik