https://github.com/d12/simpleneuralnetwork

A simple neural network implementation in Ruby.
https://github.com/d12/simpleneuralnetwork

machine-learning neural-network ruby

Last synced: 9 days ago
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A simple neural network implementation in Ruby.

• Host: GitHub
• URL: https://github.com/d12/simpleneuralnetwork
• Owner: d12
• Created: 2018-02-20T20:56:12.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2021-09-02T18:45:05.000Z (over 3 years ago)
• Last Synced: 2024-04-25T14:02:40.755Z (8 months ago)
• Topics: machine-learning, neural-network, ruby
• Language: Ruby
• Size: 34.2 KB
• Stars: 1
• Watchers: 0
• Forks: 0
• Open Issues: 3
• Metadata Files:
  • Readme: README.md

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README

        
# SimpleNeuralNetwork

This is a simple neural network implementation in Ruby.

This gem does not include any learning implementations (back-prop, etc).

## Installation

```

gem install simple_neural_network

```

## Sample usage:

![Sample Neural Network](https://cdn-images-1.medium.com/max/1600/0*IUWJ5oJ_z6AiG7Ja.jpg)

The following code implements the above neural network.

```ruby

require 'simple_neural_network'

network = SimpleNeuralNetwork::Network.new

network.create_layer(neurons: 5)

network.create_layer(neurons: 7)

network.create_layer(neurons: 7)

network.create_layer(neurons: 4)

```

Neural networks are initialized with random edge weights and zero-valued neuron biases. Edge/bias initialization is configurable by setting the initialization lambdas.

The following code runs an input set against the network.

```ruby

 network.run([0.5, 0.4, 0.8, 0, 0.9])

 => [0.2257, 0.7488, 0.1016, 0.9935]

```

## Manipulating the network

### Setting a neuron bias

```ruby

network.layers[layer_index].neurons[neuron_index].bias = new_neuron_bias

```

### Setting an edge weight

In `SimpleNeuralNetwork`, edges point forward and edge weights stored as an array of integers on a `Neuron` object. To access the edge pointing from a neuron to the `n'th` neuron in the next layer:

```ruby

network.layers[layer_index].neurons[neuron_index].edges[n] = new_edge_weight

```

## Improvements / Bugs

Improvements and bugs are listed as issues in the gem repository.