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Table of Contents

This article consists of the following sections.

Features

Cookiecutter Docker Science provides the following features.
  • Improve reproducibility of the results in machine learning projects with Docker
  • Output optimal directories and file template for machine learning projects
  • Edit codes with favorite editors (Atom, vim, Emacs etc)
  • Provide make targets useful for data analysis (Jupyter notebook, test, lint, docker etc)

Introduction

NOTE: please visit home page before you get started.

Many researchers and engineers do their machine learning or data mining experiments. For such data engineering tasks, researchers apply various tools and system libraries which are constantly updated, installing and updating them cause problems in local environments. Even when we work in hosting environments such as EC2, we are not free from this problem. Some experiments succeeded in one instance but failed in another one, since library versions of each EC2 instances could be different.

By contrast, we can creates the identical Docker container in which needed tools with the correct versions are already installed in one command without changing system libraries in host machines. This aspect of Docker is important for reproducibility of experiments, and keep the projects in continuous integration systems.

Unfortunately running experiments in a Docker containers is troublesome. Adding a new library into requirements.txt or Dockerfile does not installed as if local machine. We need to create Docker image and container each time. We also need to forward ports to see server responses such as Jupyter Notebook UI launch in Docker container in our local PC. Cookiecutter Docker Science provides utilities to make working in Docker container simple.

This project is a tiny template for machine learning projects developed in Docker environments. In machine learning tasks, projects glow uniquely to fit target tasks, but in the initial state, most directory structure and targets in Makefile are common. Cookiecutter Docker Science generates initial directories which fits simple machine learning tasks.

Requirements

Quick start

To generate project from the cookiecutter-docker-science template, please run the following command.

$cookiecutter git@github.com:docker-science/cookiecutter-docker-science.git

Then the cookiecutter command ask for several questions on generated project as follows.

$cookiecutter git@github.com:docker-science/cookiecutter-docker-science.git
project_name [project_name]: food-image-classification
project_slug [food_image_classification]:
jupyter_host_port [8888]:
description [Please Input a short description]: Classify food images into several categories
Select data_source_type:
1 - s3
2 - nfs
3 - url
data_source [Please Input data source]: s3://research-data/food-images

Then you get the generated project directory, food-image-classification.

Initial directories and files

The following is the initial directory structure generated in the previous section.

├── Makefile                          <- Makefile contains many targets such as create docker container or
│                                        get input files.
├── config                            <- This directory contains configuration files used in scripts
│   │                                    or Jupyter Notebook.
│   └── jupyter_config.py
├── data                              <- data directory contains the input resources.
├── docker                            <- docker directory contains Dockerfile.
│   ├── Dockerfile                    <- Base Dockerfile contains the basic settings.
│   ├── Dockerfile.dev                <- Dockerfile for experiments this Docker image is derived from the base Docker image.
│   │                                    This Docker image does not copy the files and directory but used mount the top
│   │                                    directory of the host environments.
│   └── Dockerfile.release            <- Dockerfile for production this Docker image is derived from the base Docker image.
│                                        The Docker image copy the files and directory under the project top directory.
├── model                             <- model directory store the model files created in the experiments.
├── my_data_science_project           <- cookie-cutter-docker-science creates the directory whose name is same
│   │                                    as project name. In this directory users puts python files used in scripts
│   │                                    or Jupyter Notebook.
│   └── __init__.py
├── notebook                          <- This directory stores the ipynb files saved in Jupyter Notebook.
├── requirements.txt                  <- Libraries needed in the project. The library listed in this file
│                                        are installed in the Docker images for not only development but also production.
├── requirements_dev.txt              <- Libraries needed to run experiments. The library listed in this file
│                                        are installed in the Docker images for developments.
└── scripts                           <- Users add the script files to generate model files or run evaluation.

Makefile targets

Cookiecutter Docker Science provides many Makefile targets to supports experiments in a Docker container. Users can run the target with make [TARGET] command.

init

After cookiecutter-docker-science generate the directories and files, users first run this command. init setups resources for experiments. Specifically init run init-docker and sync-from-source command.

  • init-docker

    init-docker command first creates Docker the images based on docker/Dockerfile.

  • sync-from-source

    sync-from-source downloads input files which we specified in the project generation. If you want to change the input files, please modify this target to download the new data source.

create-container

create-container command creates Docker container based on the created image and login the Docker container.

start-container

Users can start and login the Docker container with start container created by the create-container.

jupyter

jupyter target launch Jupyter Notebook server.

profile

profile target shows the misc information of the project such as port number or container name.

clean

clean target removes the artifacts such as models and *.pyc files.

  • clean-model

    clean-model command removes model files in model directory.

  • clean-pyc

    clean-pyc command removes model files of *.pyc, *.pyo and __pycache__.

  • clean-docker

    clean-docker command removes the Docker images and container generated with make init-docker and make create-container. When we update Python libraries in requirements.txt or system tools in Dockerfile, we need to clean Docker the image and container with this target and create the updated image and container with make init-docker and make create-container.

distclean

distclean target removes all reproducible objects. Specifically this target run clean target and remove all files in data directory.

  • clean-data

    clean-data command removes all datasets in data directory.

lint

lint target check if coding style meets the coding standard.

test

test target executes tests.

sync-to-source

sync-to-remote target uploads the local files stored in data to specified data sources in such as S3 or NFS directories.

Working with Docker container

With Cookiecutter Docker Science, data scientists or software engineers do their developments in host environment. They open Jupyter notebook in the browsers in the host machine connecting the Jupyter server launched in Docker container. They also writes the ML scripts or library classes in the host machine. The code modification in host environment are reflected in the container environment. In the containers, they just launch Jupyter server or start ML scripts with make command.

Files and directories

When you log in a Docker container by make create-container or make start-container command, the log in directory is /work. The directory contains the project top directories in host computer such as data or model. Actually the Docker container mounts the project directory to /work of the container and therefore when you can edit the files in the host environment with your favorite editor such as Vim, Emacs, Atom or PyCharm. The changes in host environment are reflected in container environment.

Jupyter Notebook

We can run a Jupyter Notebook in the Docker container. The Jupyter Notebook uses the default port 8888 in Docker container (NOT host machine) and the port is forwarded to the one you specify with JUPYTER_HOST_PORT in the cookiecutter command. You can see the Jupyter Notebook UI accessing "http://localhost:JUPYTER_HOST_PORT". When you save notebooks the files are saved in the notebook directory.

Tips

Generate Docker Image for production

make init-docker command creates a Docker image based on docker/Dockerfile.dev, which contains libraries for developments. The libraries are not needed in production.

To create a Docker image for production which does not contain the development libraries such as Jupyter, we run make init-docker command specifying a environment variable MODE to release as make init-docker MODE=release.

Override port number for Jupyter Notebook

In the generation of project with cookiecutter, the default port of Jupyter Notebook in host is 8888. The number is common and could have a collision to another server processes.

If we already have the container, we first need to remove the current container with make clean-container. And then we create the Docker container changing the port number with make create-container command adding the Jupyter port parameter (JUPYTER_HOST_PORT). For example the following command creates Docker container forwarding Jupyter default port 8888 to 9900 in host.

make create-container JUPYTER_HOST_PORT=9900

Then you launch Jupyter Notebook in the Docker container, you can see the Jupyter Notebook in http://localhost:9900

Specify suitable Dockerfile in stages

Some projects can have multiple Dockerfiles. Dockerfile.gpu contains the settings for GPU machines. Dockerfile.cpu contains settings to be that can be used in production for non-GPU machines.

To use one of these specific Dockerfile, override the settings by adding parameters to the make command. For example, when we want to create a container from docker/Dockerfile.cpu, we run make create-container DOCKERFILE=docker/Dockerfile.cpu.

Show target specific help

help target flushes the details of specified target. For example, to get the details of clean target.

$make help TARGET=clean
target: clean
dependencies: clean-model clean-pyc clean-docker
description: remove all artifacts

As we can see, the dependencies and description of the specified target (clean) are shown.

License

Apache version 2.0

Contribution

See CONTRIBUTING.md.

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Cookiecutter template for data scientists working with Docker containers

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