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Python3 wrapper for the Weka Machine Learning Workbench

Project description

The python-weka-wrapper3 package makes it easy to run Weka algorithms and filters from within Python 3. It offers access to Weka API using thin wrappers around JNI calls using the javabridge package.

Forum for project at:!forum/python-weka-wrapper


0.2.4 (2021-11-25)

  • added method help_for to weka.core.classes module to generate a help screen for an weka.core.OptionHandler class using just the classname.
  • the to_help method of the weka.core.classes.OptionHandler class now allows to tweak the generated output a bit better (e.g., what sections to output).
  • setting window title of Matplotlib is now dependent on version (to avoid deprecation notice being output)
  • plot_classifier_errors (module weka.plot.classifiers) now plots the diagonal after adding all the plot data to get the right limits

0.2.3 (2021-06-09)

  • added weka.core.distances module for distance functions, with DistanceFunction base class
  • added avg_silhouette_coefficient method to weka.clusterers to calculate the average silhouette coefficient

0.2.2 (2021-04-23)

  • the Package class of the weka.core.packages module now has a version property to quickly access the version which is stored in the meta-data; the metadata property now returns a proper Python dictionary
  • added convenience methods to the weka.core.packages module: install_packages to install more than one package, install_missing_package and install_missing_packages to install one or more packages if missing (can automatically stop the JVM and exit the process), uninstall_packages to remove more than one package in one operation

0.2.1 (2021-04-12)

  • the ASEvaluation class in the weka.attribute_selection module now offers the following methods for attribute transformers like PCA: transformed_header, transformed_data, convert_instance
  • classes derived from weka.core.classes.JavaObject are now serializable via pickle
  • added the method copy_structure to the weka.core.dataset.Instances class to quickly get the header of a dataset
  • added the property header to the following classes that returns the training data structure: ASEvaluation, ASSearch, Associator, Classifier, Clusterer, TSForecaster
  • methods from weka.core.serialization have been moved into weka.core.classes, with the following methods getting the serialization_ prefix: write, write_all, read, read_all

0.2.0 (2021-02-21)

  • classes.new_instance method can take an options list now as well
  • added classes.get_enum method to return the instance of a Java enum item
  • added classes.new_instance method to create new instance of Java class
  • added typeconv.jstring_list_to_string_list method to convert a java.util.List containing strings into a Python list
  • added typeconv.jdouble_to_float method to convert a java.lang.Double to a Python float
  • in module typeconv renamed methods: string_array_to_list to jstring_array_to_list, string_list_to_array to string_list_to_jarray, double_matrix_to_ndarray to jdouble_matrix_to_ndarray, enumeration_to_list to jenumeration_to_list, double_to_float to float_to_jfloat
  • added weka.timeseries module that wraps the timeseriesForecasting Weka package

0.1.16 (2020-12-26)

  • upgraded Weka to 3.9.5

0.1.15 (2020-10-25)

0.1.14 (2020-05-26)

  • added AttributeSelectedClassifier meta-classifier to module weka.classifiers
  • added AttributeSelection meta-filter to module weka.filters

0.1.13 (2020-05-06)

  • added class_index parameter to weka.core.converters.load_any_file and weka.core.converters.Loader.load_file, which allows specifying of index while loading it (first, second, third, last-2, last-1, last or 1-based index).
  • added append and clear methods to weka.filters.MultiFilter and weka.classifiers.MultipleClassifiersCombiner to make adding of filters/classifiers easier.
  • added attribute_names() method to weka.core.dataset.Instances class
  • added subset method to weka.core.dataset.Instances class, which returns a subset of columns and/or rows.

0.1.12 (2020-01-10)

  • added method list_property_names to weka.core.classes module to allow listing of Bean property names (which are used by GridSearch and MultiSearch) for a Java object.

0.1.11 (2020-01-04)

  • Upgraded Weka to 3.9.4
  • added method suggest_package to the weka.core.packages module for suggesting packages for partial class names/package names (NNge or .ft.) or exact class names (weka.classifiers.meta.StackingC)
  • the JavaObject.new_instance method now suggests packages (if possible) in case the instantiation fails due to package not installed or JVM not started with package support

0.1.10 (2019-12-02)

  • method train_test_split of the weka.dataset.Instances class now creates a copy of itself before applying randomization, to avoid changing the order of data for subsequent calls.

0.1.9 (2019-11-19)

  • method create_instances_from_matrices from module weka.core.dataset now works with pure numeric data again
  • added sections for creating datasets (manual, lists, matrices) to examples documentation

0.1.8 (2019-11-11)

  • added console scripts: pww-associator, pww-attsel, pww-classifier, pww-clusterer, pww-datagenerator, pww-filter
  • added serialize, deserialize methods to weka.classifiers.Classifier to simplify loading/saving model
  • added serialize, deserialize methods to weka.clusterers.Clusterer to simplify loading/saving model
  • added serialize, deserialize methods to weka.filters.Filter to simplify loading/saving filter
  • added methods plot_rocs and plot_prcs to weka.plot.classifiers module to plot ROC/PRC curve on same dataset for multiple classifiers
  • method plot_classifier_errors of weka.plot.classifiers module now allows plotting predictions of multiple classifiers by providing a dictionary
  • method create_instances_from_matrices from module weka.core.dataset now allows string and bytes as well
  • method create_instances_from_lists from module weka.core.dataset now allows string and bytes as well

0.1.7 (2019-01-11)

  • added wrapper classes for association classes that implement AssociationRuleProducer (package weka.associations): AssociationRules, AssociationRule, item
  • added to_source method to weka.classifiers.Classifier and weka.filters.Filter (underlying Java classes must implement the respective Sourcable interface)

0.1.6 (2018-10-28)

  • fixed logging setup in weka.core.jvm to avoid global setting global logging setup to DEBUG (thanks to

0.1.5 (2018-09-16)

  • upgraded to Weka 3.9.3
  • weka.jar now included in PyPi package
  • exposed the following methods in weka.classifiers.Evaluation: cumulative_margin_distribution, sf_prior_entropy, sf_scheme_entropy

0.1.4 (2018-02-18)

  • upgraded to Weka 3.9.2
  • properly initializing package support now, rather than adding package jars to classpath
  • added weka.core.ClassHelper Java class for obtaining classes and static fields, as javabridge only uses the system class loader

0.1.3 (2017-08-23)

  • added check_for_modified_class_attribute method to FilterClassifier class
  • added complete_classname method to weka.core.classes module, which allows completion of partial classnames like .J48 to weka.classifiers.trees.J48 if there is a unique match; JavaObject.new_instance and JavaObject.check_type now make use of this functionality, allowing for instantiations like Classifier(cls=”.J48”)
  • jvm.start(system_cp=True) no longer fails with a KeyError: ‘CLASSPATH’ if there is no CLASSPATH environment variable defined
  • Libraries mtl.jar, core.jar and arpack_combined_all.jar were added as is to the weka.jar in the 3.9.1 release instead of adding their content to it. Repackaged weka.jar to fix this issue (

0.1.2 (2017-01-04)

  • typeconv.double_matrix_to_ndarray no longer assumes a square matrix (
  • len(Instances) now returns the number of rows in the dataset (module weka.core.dataset)
  • added method insert_attribute to the Instances class
  • added class method create_relational to the Attribute class
  • upgraded Weka to 3.9.1

0.1.1 (2016-10-19)

  • plot_learning_curve method of module weka.plot.classifiers now accepts a list of test sets; * is index of test set in label template string
  • added missing_value() methods to weka.core.dataset module and Instance class
  • output variable y for convenience method create_instances_from_lists in module weka.core.dataset is now optional
  • added convenience method create_instances_from_matrices to weka.core.dataset module to easily create an Instances object from numpy matrices (x and y)

0.1.0 (2016-05-09)

  • initial release of Python3 port

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