Data Science fun using the image dataset from my rps-cv project:

A Rock-Paper-Scissors game using computer vision and machine learning on Raspberry Pi.

Checkout the rps-cv project repository on GitHub at DrGFreeman/rps-cv

The following Jupyter notebooks are included in the repository:

• pca-svm_classifier_skopt.ipynb
  This notebook shows how to train a Support Vector Machine classifier on the grayscale images using Principal Component Analysis for dimensionality reduction and Bayesian optimization of the model hyperparameters. The model is trained using 75% of the dataset with a five fold cross-validation and achieves a F1 (micro) score of 97.6% on a test set of 547 images (the remainig 25% of the dataset)

• pca_visualization.ipynb
  This notebook presents a visualisation of the Principal Component Analysis (PCA) method used as dimensionality reduction in my Rock-Paper-Scissors game project. The objective of the notebook is mainly to develop an intuition of the meaning of PCA applied to images rather than to present a mathematically rigorous definition of PCA.

• pca_viz-interactive.ipynb
  This notebook is similar to the pca_visualization notebook except it uses interactive sliders to display the image reconstruction using principal components. Note that GitHub does not render the interactive widgets.

To get started, download or clone this repository:

$ git clone https://github.com/DrGFreeman/rps-cv-data-science.git

Then download and extract the dataset and install the required dependencies as per instructions below.

Once the above steps are completed, launch Jupyter Lab with the command

$ jupyter lab

or Jupyter notebook with the command

$ jupyter notebook

The dataset consists of 2188 images of Rock, Paper and Scissors hand gestures captured from the rps-cv game. The dataset is relatively well balanced, with 710, 726 and 752 images of the Rock, Paper and Scissors gestures respectively. The images corresponding to each gesture are stored in subdirectories named rock, paper and scissors.

The dataset is released under the Creative Commons Attribution Share-Alike 4.0 license (CC-BY-SA 4.0).

The dataset can be downloaded from the following link: https://www.dropbox.com/s/sr1iui3zfdk0o53/rps-cv-image.zip. The images can then be extracted into the img directory of the cloned repository. On Linux, this can be done from the command line:

$ cd rps-cv-data-science
$ wget https://www.dropbox.com/s/sr1iui3zfdk0o53/rps-cv-images.zip
$ unzip rps-cv-images.zip -d img/
$ rm rps-cv-images.zip

The Jupyter notebooks in this repository depend on different Python packages. The simplest way to install all the required packages is by using the Anaconda Distribution and the conda package manager.

Two environment files are provided to setup conda virtual environments, one base environment for the traditional machine learning tasks using Scikit-Learn, and one for both traditional machine learning using Scikit-Learn and deep-learning using the Keras library and GPU accelerated Tensorflow backend.

To setup an environment with the base libraries use the environment-base.yml environment file:

$ conda env create -f environment-base.yml

This will create an environment named rps-cv that can be activated with the command

$ conda activate rps-cv

To setup an environment for deep-learning using Keras, use the environment-keras-gpu.yml environment file:

$ conda env create -f environment-keras-gpu.yml

This will create an environment named rps-cv-keras that can be activated with the command

$ conda activate rps-cv-keras

Note that this second environment installs the GPU accelerated versions of Keras and the Tensorflow backend. This will only work if your computer is equipped with a Cuda compatible Nvidia GPU. Running the artificial neural network notebooks from this repository is intractable on a CPU.

To allow changing the conda environments from within Jupyter Lab or Jupyter Notebook, install the nb_conda package in the base conda environment:

(base) $ conda install nb_conda

Jupyter Lab or Jupyter Notebook can then be launched from the base environment and the desired kernel (conda environment) selected within Jupyter.

To use the interactive widgets in jupyter lab, the ipywidgets jupyter lab extension must be installed with the following command:

(rps-cv) $ jupyter labextension install @jupyter-widgets/jupyterlab-manager