Neural network in Go

Overview

network

Package network is a simple implementation of a nonbiased neural network.

The networks created by this package can be trained with backpropagation and use a variety of activation functions.

For example, the following code trains a simple 2x3x1 neural network the XOR function:

config := []network.LayerConf{
	network.LayerConf{Inputs: 2},
	network.LayerConf{Inputs:3, Activation: activation.LeakyReLU{Leak: 0.01}},
	network.LayerConf{Inputs:1, Activation: activation.LeakyReLU{Leak: 0.01}},
}
net, err := network.NewNetwork(config)
if err != nil {
	log.Fatalln(`can't create network`, err)
}

// Training samples
samples := map[[2]float64][]float64{
	[2]float64{0, 0}: []float64{0},
	[2]float64{0, 1}: []float64{1},
	[2]float64{1, 0}: []float64{1},
	[2]float64{1, 1}: []float64{0},
}

targetMSE := 0.005  // Desired Mean Squared Error
learningRate := 0.1 // Learning rate for the network, larger is faster, smaller is more accurate

var iter int

for iter = 0; iter < 1000; iter++ {
	meanSquaredError := float64(0)

	for input, target := range samples {
		input := input[:]
		output := net.Forward(input)
		error := net.Error(output, target)
		net.Backprop(input, error, learningRate)

		for _, e := range error {
			meanSquaredError += math.Pow(e, 2)
		}
	}

	meanSquaredError /= float64(len(samples))

	if meanSquaredError <= targetMSE {
		break
	}
}

log.Println(`Took`, iter, `iterations to reach target MSE`, targetMSE)

for input, target := range samples {
	log.Println(`Input:`, input, `Target:`, target, `Output:`, net.Forward(input[:])
}

Usage

type LayerConf

type LayerConf struct {
	Inputs     int
	Activation activation.Activation
}

LayerConf represents a configuration for one single layer in the network

type Network

type Network struct {
}

Network is structure that represents an unbiased neural network

func NewNetwork

func NewNetwork(layerConfigs []LayerConf) (*Network, error)

NewNetwork creates a new neural network with the desired layer configurations. The activation is ignored for the first layer and has to be set to nil.

The following creates a fully connected 2x3x1 network with sigmoid activation between all layers:

config := []LayerConf{
  LayerConf{Inputs: 2, Activation: nil},
  LayerConf{Inputs: 3, Activation: SigmoidActivation{}},
  LayerConf{Inputs: 1, Activation: SigmoidActivation{}},
}
net := network.NewNetwork(config)

func (*Network) Backprop

func (n *Network) Backprop(inputs, error []float64, learningRate float64)

Backprop performs one pass of back propagation through the network for the given input, error and learning rate.

Before Backprop is called, you need to do one forward pass for the input with Forward. A typical usage looks like this:

input := []float64{0, 1.0, 2.0}
target := []float64{0, 1}
output := net.Forward(input)
error := net.Error(output, target)
net.Backprop(input, error, 0.1) // Perform back propagation with learning rate 0.1

func (*Network) Error

func (n *Network) Error(outputs, targets []float64) []float64

Error computes the error of the given outputs when compared to the given targets.

This is intended to be used during training. See the documentation for Backprop for an example usage.

func (*Network) Forward

func (n *Network) Forward(inputs []float64) []float64

Forward performs a forward pass through the network for the given inputs. The returned value is the output of the uppermost layer of neurons.

func (*Network) Restore

func (n *Network) Restore(prefix string) error

Restore restores a network that was previously saved with Snapshot.

The result is undefined if the network architecture differs.

func (*Network) Snapshot

func (n *Network) Snapshot(prefix string) error

Snapshot stores a snapshot of all layers to files prefixed with prefix. The files are suffixed with the layer number and the string .layer.

Owner
Shingirai Chanakira
Just another developer.
Shingirai Chanakira
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