# DeepLearning.scala

**DeepLearning.scala** is a DSL for creating complex neural networks.

With the help of DeepLearning.scala, regular programmers are able to build complex neural networks from simple code. You write code almost as usual, the only difference being that code based on DeepLearning.scala is differentiable, which enables such code to evolve by modifying its parameters continuously.

## Features

### Differentiable basic types

Like Theano and other deep learning toolkits, DeepLearning.scala allows you to build neural networks from mathematical formulas. It supports floats, doubles, GPU-accelerated N-dimensional arrays, and calculates derivatives of the weights in the formulas.

### Differentiable ADTs

Neural networks created by DeepLearning.scala support ADT data structures (e.g. HList and Coproduct), and calculate derivatives through these data structures.

### Differentiable control flow

Neural networks created by DeepLearning.scala may contains control flows like `if`

/`else`

/`match`

/`case`

in a regular language. Combined with ADT data structures, you can implement arbitary algorithms inside neural networks, and still keep some of the variables used in the algorithms differentiable and trainable.

### Composability

Neural networks created by DeepLearning.scala are composable. You can create large networks by combining smaller networks. If two larger networks share some sub-networks, the weights in shared sub-networks trained with one network affect the other network.

### Static type system

All of the above features are statically type checked.

## Roadmap

### v1.0

Version 1.0 is the current version with all of the above features. The final version will be released in March 2017.

### v2.0

- Support
`for`

/`while`

and other higher-order functions on differenitable`Seq`

s. - Support
`for`

/`while`

and other higher-order functions on GPU-accelerated differenitable N-dimensional arrays.

Version 2.0 will be released in Q2 2017.

### v3.0

- Support using custom
`case class`

es inside neural networks. - Support distributed models and distributed training on Spark.

Version 3.0 will be released in late 2017.

## Links

## Acknowledges

DeepLearning.scala is heavily inspired by my colleague @MarisaKirisame. Originally, we worked together for a prototype of deep learning framework, then we split our work aprt to this project and DeepDarkFantasy.

@milessabin's shapeless provides a solid foundation for type-level programming as used in DeepLearning.scala.