packages

Installing packages in Docker image

0.2.9 and older

When building Docker images for your environments, your code will most likely rely on additional Weka packages. You can install the packages by creating a little Python script that uses python-weka-wrapper3 to install them (just like you would normally do in a script). Here is the content of the install_packages.py script:

import weka.core.jvm as jvm
import weka.core.packages as packages

jvm.start(packages=True)

# for reproducibility, we also specify the version of the package that we need
packages.install_package("SelfOrganizingMap", version="1.0.3")

jvm.stop()

A minimal Dockerfile then looks like this (using the CPU Docker base image of pww3 0.2.9):

FROM fracpete/pww3:0.2.9_cpu
COPY install_packages.py /workspace/install_packages.py
RUN python3 /workspace/install_packages.py

You can then build this image just like any other Docker image:

docker build -t pww3-pkg .

The following command simply runs the local test_packages.py script to check whether the installation was successful. To achieve this, it maps the current directory (pwd) into the container's /workspace/scripts directory:

docker run \
    -v `pwd`:/workspace/scripts \
    -t pww3-pkg:latest \
    python3 /workspace/scripts/test_packages.py

The output will be something like this:

DEBUG:weka.core.jvm:Adding bundled jars
DEBUG:weka.core.jvm:Classpath=...
DEBUG:weka.core.jvm:MaxHeapSize=default
DEBUG:weka.core.jvm:Package support enabled
SelfOrganizingMap/1.0.3
  http://prdownloads.sourceforge.net/wekann/SelfOrganizingMap1.0.3.zip?download
weka.clusterers.SelfOrganizingMap -L 1.0 -O 2000 -C 1000 -H 2 -W 2

0.2.10 and newer

With version 0.2.10 and later, you can also use the pww-packages entry point to install packages rather than having to rely on Python scripts.

The above minimal Dockerfile gets even shorter (using the CPU Docker base image of pww3 0.2.10):

FROM fracpete/pww3:0.2.10_cpu
RUN pww-packages install SelfOrganizingMap==1.0.3 

And you can also list the installed packages without a script now:

docker run \
    -t pww3-pkg:latest \
    pww-packages list installed