dl-turtle is a wrapper library around Theano which allows user to build deep learning models, set parameters, start and analyse training. dl-turtle comes with an intuitive UI enabling user to build model using drag and drop.

Theano is a scientific library for defining symbolic mathematical expressions. Theano simplifies deep learning because of its automatic differentiation feature. However, Theano is an over-kill for traditional applications of deep learning since it is geared towards researchers. Thus, building an end-to-end deep learning system in Theano is still a lot of work. dl-turtle simplifies model building by its canvas based intuitive web UI. It also allows user to view how the training is progressing using rich visualizations.

####Canvas based HTML5 UI Web frontend for building the model graph and sending equivalent JSON representation to server

####Model Builder Parses JSON representation and builds equivalent model in Theano

####Data Handler Handles standard datasets (currently supported datasets: MNIST, CIFAR)

####Optimizer Takes the model and minimizes it using 'Gradient Descent' algorithms

####Layers Basic building blocks of the deep net (currently supported layers: convolution, pool, FC, softmax)

####Sampler Samples 3 random images from test set and sends back the top-three guesses for those images to the front-end

1. Model is represented by a graph using HTML5 UI
2. Graphical model is then transformed into a JSON representation
3. JSON representation of model is then sent to the server.
4. Server re-directs the string to Model Builder which parses the string and creates an equivalent model in Theano.
5. User is then redirected to Analyser window where training progression is seen
6. Server sends cost along with sample test images with top three guesses back to the user. Aalyser window incorporates this information as it arrives.

dl-turtle could be used by students who could define model with ease, tune parameters, apply them to standard datasets and see how training progresses by plugging different hyper-parameters. Most of the heavy-lifting is then done by dl-turtle at server end. Once we integrate feature to upload dataset, persist and load model, dl-turtle could be used a general purpose tool for solving arbitrary deep learning problems.