A toolbox to explore synchronous layerwise-parallel deep neural networks.
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README.md

statestream

Statestream is an experimental toolbox for streaming (see also this explanation) deep neural networks. It provides tools to easily design, train, visualize, and manipulate streaming deep neural networks.

This software is a research prototype and not ready for production use. It has neither been developed nor tested for a specific use case. However, the license conditions of the applicable Open Source licenses allow you to adapt the software to your needs.

Because this toolbox currently is in trial / test phase, code APIs should not be expected to stay stable and continuous improvements will be made. Please make sure you always have the current version.

Example visualization of a very simple example.


Documentation

Troubleshooting


Some cornerstones

  • Emphasis on streaming (or this) data and networks.
  • Emphasis on flexible and intuitive online visualization / manipulation of network states / parameters, etc.
  • Qualitative not quantitative exploration of new network architectures (first 50 percent vs. last 2 percent performance).
  • Emphasis on parallelism (processes, GPUs, restriced across machines).
  • Suited for specific type of very large (numerous but small network modules/layers) recurrent neural networks.

Implementation:

  • Networks are specified as yaml files.
  • For now, statestream supports Theano (default) or Tensorflow as backend.

Differences to prominent DL-frameworks

The statestream toolbox does not aim to improve over existing tools with respect to memory or computation efficiency but rather enables investigation of streaming networks and interact with them during runtime. In fact, the statestream toolbox is much more memory / computation in-efficient than other existing tools.

  • streaming: The network parts process information in a frame based / model-parallel synchronized manner, where one frame can be interpreted as one-step rollout of a recurrent neural network. Hence, dependent on network architecture, it may take several (up to many) frames until information is processed by the network. Now states stream through the network. While this toolbox supports only streaming network rollouts, scripts to benchmark different rollouts can be found in the reference/ folder.
  • separation of 'Layers': In contrast to most other deep learning toolkits, which decompose the network into layers, we try to emphasise the graph-nature of neural networks already in implementation. Hence, inside the statestream toolbox the network is decomposed in nodes (neuron-pools, short NP) and edges (synapse-pools, short SP). While NPs hold the state (a.k.a. feature maps) of the network, the SPs define the transformations between those states. For both, NPs and SPs, trainable parameters can be specified (e.g. bias for NPs, weights for SPs).
  • local updates: Due to its streaming nature for execution, losses and more general everything that changes parameters (in statestream these are called plasticities) are treated as separated parts of the network. While statestream also allows 'global' losses covering the entire network, it emphasises on 'local' plasticities, which rely only on information from small parts of the network to determine updates for small subset of parameters.

Pros

  • (+) Enables streaming (consistently model-parallel) networks.
  • (+) Intuitive behavior of recurrent neural networks (no extra rollout).
  • (+) Shared memory representation enables online visualization and manipulation of network behavior.
  • (+) Trivial parallelization across CPUs and GPUs due to model-parallelism.

Cons

  • (-) Shared memory makes it harder to scale across machines.
  • (-) Network representation in shared memory requires a considerable amount of memory and (parallel) inter-process communication.
  • (-) For streaming (model-parallel) networks it is more challenging to specify adequate plasticities (losses).

Installation requirements

The statestream toolbox is tested with:

If one wants to use GPU support, it is assumed that CUDA toolkit >=8.0 and optionally cuDNN >=5.0 is installed.

Besides the requirements below, we strongly recomment using anaconda or miniconda to manage python packages and to set up a conda python environment, e.g.:

conda create --name statestream python=3.5
source activate statestream

The statestream toolbox requires the following python packages:

To use the theano backend, the following packages are required:

To use the tensorflow backend, the following packages are required:

For the Theano backend, these requirements can be installed with:

conda install numpy scipy mkl theano pygpu scikit-image ruamel_yaml matplotlib h5py
pip install pygame sharedarray

Additionally, Tensorflow can be installed, e.g. through:

pip install --ignore-installed --upgrade https://storage.googleapis.com/tensorflow/linux/gpu/tensorflow_gpu-1.4.0-cp35-cp35m-linux_x86_64.whl

Installation

  • Check that all requirements are installed.
  • Checkout the statestream repository.
  • Compile some c/c++ functions:
cd statestream/ccpp
make
cd ..
  • Add the path of the repository (the folder that also contains this README.md) to the PYTHONPATH environment variable, e.g. with:
export PYTHONPATH=$PYTHONPATH:/path to repository/
  • Finally call the core once for initialization:
python core.py

Now the configuration file ~/.statestream/stcore.yml was created and one can change the theano flag or the save folder parameter which specifies where for example models should be saved. In this folder also other log files are stored during runtime.

The demonstration example does not make use of GPU acceleration, but in order to use GPU support see the help on devices.


Demonstration example

A demonstration example is provided with this repository for which neither an external dataset nor GPU support is required. It consists of a simple 4 layer network for classification of the first 10 roman numerals: I, II, III, IV, V, VI, VII, VIII, IX, X. Dependent on the monitor settings on the system, one may want to adapt the screen_width and screen_height setting in ~/.statestream/stviz.yml (available after first launch of the visualization) and the backend setting in the demo.st_graph specification. The demonstration example in particular uses a resolution of 1600 x 900. By default, this example will use the tensorflow backand. For the theano backend, the line

backend: tensorflow

in the examples/demo.st_graph file has to be removed or replaced with the line

backend: theano

Now the demonstration can be started from the statestream folder with:

python core.py ../examples/demo.st_graph

In fact, this is the preferred way to start any statestream session. The statestream terminal starts and the last line in the console should look like the following (only with the current time):

Wed, 21 Dec 2016 12:53:41 @ initializing: (7 remaining) <<  <<

Now, the entire network specified in demo.st_graph is instantiated in the background. Wait until the number of remaining items which are not yet instantiated reaches 0 and the network is ready (this can take some seconds), e.g.:

Wed, 21 Dec 2016 12:55:03 @ 00000000 <<  <<

While waiting, one can already start the provided GUI by entering viz on into the terminal and hitting enter:

Wed, 21 Dec 2016 12:53:50 @ initializing: (1 remaining) << viz on <<

The GUI opens and the network topology can be inspected. For this demonstration example, an example layout (graphview) of the network is provided. Once all items are instantiated, the network streaming can be started by pushing the play button in the GUI or entering stream into the terminal:

Wed, 21 Dec 2016 12:55:24 @ 00000000 << stream <<

In the visualization, one should see a similar overview to that at the top of this readme. The network is now streaming (the counter in the statestream terminal is the current frame), e.g.:

Wed, 21 Dec 2016 12:44:31 @ 00000732 << <<

To end the demonstration, enter exit in the statestream terminal.

Before running other provided examples, please set visible_devices in ~/.statestream/stcore.yml configuration file and read documentation on devices. Also see the network specification and adapt especially paths, local devices, and the backend specified in the st_graph example files. For more information on the statestream terminal and visualization, please visit the documentation. Good places to start further reading are:

An example realizing the common training / validation / test session is also provided: st_graph file, client file.


Contributing

Please see also CONTRIBUTING.


License

The statestream toolbox is open-sourced under the Apache-2.0 license. See the LICENSE file for details.

For a list of other open source components included in the statestream toolbox, see the file 3rd-party-licenses.txt.