How to create arff file in weka

How do I make my data into an ARFF file?

Save your dataset in ARFF format by clicking theFile” menu and selecting “Save as…”. Enter a filename with a . arff extension and click the “Save” button.

What is ARFF file in Weka?

An ARFF (Attribute-Relation File Format) file is an ASCII text file that describes a list of instances sharing a set of attributes. ARFF files were developed by the Machine Learning Project at the Department of Computer Science of The University of Waikato for use with the Weka machine learning software.

Where can I find ARFF files in Weka?

arff file is available from the various WEKA manuals. There are some sample data sets that come with WEKA that you can access and play with. These are all in a data directory where the program is installed (on PCs, under “program files” and on the LC machines they should be under /usr/local/share/weka-3.6. 4/data).

How do I create an ARFF file from Excel?

  1. Open the Weka GUI Chooser and then click on the tools button in the top menu bar.
  2. Click on the Arffviwer.
  3. Choose file types to be loaded like, *.csv, *.data.
  4. Open *.csv file to view the data and values.
  5. Name the file with the .arff extension.
  6. Save the file.

How do I convert a CSV file to Arff?

You can also use the ArffViewer (Tools -> ArffViewer or Ctrl+A). Then open your CSV file. Next go to File -> Save as and select Arff data files (should be selected by default). Note that your fields must be separated with a comma and not a semicolon.

How do I open an ARFF file in Excel?

Simply export your . arff file to CSV format. Once you have the . csv file, import that to MS Excel or similar spreadsheet program and save it either as .

How do I open an ARFF file?

The best way to open an ARFF file is to simply double-click it and let the default assoisated application open the file. If you are unable to open the file this way, it may be because you do not have the correct application associated with the extension to view or edit the ARFF file.

How do I convert a text file to ARFF format?

One simple way to do this is in version 3.6. 11 (I’m on a mac) is to open up the Explorer and then in the Preprocess tab select “Open file“, just as you would when you want to open a . arff file. Then where it asks for the File Format at the bottom of the dialog box, change it to .

How can I download dataset for Weka?

The regression datasets can be downloaded from the WEKA webpage “Collections of datasets”. It has 37 regression problems obtained from different sources. The downloaded file will create numeric/directory with regression datasets in . arff format.

Is Weka a testing tool?

Weka is tried and tested open source machine learning software that can be accessed through a graphical user interface, standard terminal applications, or a Java API.

What is Weka tool?

Weka is a collection of machine learning algorithms for data mining tasks. Weka contains tools for data pre-processing, classification, regression, clustering, association rules, and visualization.

How do we sample in Weka?

How do you overcome class imbalance?

7 Techniques to Handle Imbalanced Data
  1. Use the right evaluation metrics.
  2. Resample the training set.
  3. Use K-fold Cross-Validation in the right way.
  4. Ensemble different resampled datasets.
  5. Resample with different ratios.
  6. Cluster the abundant class.
  7. Design your own models.

What is random undersampling?

Random undersampling involves randomly selecting examples from the majority class and deleting them from the training dataset. In the random under-sampling, the majority class instances are discarded at random until a more balanced distribution is reached.

Which is better undersampling or oversampling?

As far as the illustration goes, it is perfectly understandable that oversampling is better, because you keep all the information in the training dataset. With undersampling you drop a lot of information. Even if this dropped information belongs to the majority class, it is usefull information for a modeling algorithm.

Is sometimes called oversampling?

The term oversampling is also used to denote a process used in the reconstruction phase of digital-to-analog conversion, in which an intermediate high sampling rate is used between the digital input and the analogue output.

What is smote technique?

SMOTE (synthetic minority oversampling technique) is one of the most commonly used oversampling methods to solve the imbalance problem. It aims to balance class distribution by randomly increasing minority class examples by replicating them. SMOTE synthesises new minority instances between existing minority instances.

How do I install smote?

From source available on GitHub

Use the following commands to get a copy from Github and install all dependencies: git clone cd imbalanced-learn pip install . Be aware that you can install in developer mode with: pip install –no-build-isolation –editable .

How can I improve my smote?

SMOTE first start by choosing random data from the minority class, then k-nearest neighbors from the data are set.


  1. SMOTE. We would start by using the SMOTE in their default form.
  2. SMOTE-NC.
  3. Borderline-SMOTE.
  4. Borderline-SMOTE SVM.
  5. Adaptive Synthetic Sampling (ADASYN)

Why is smote used?

SMOTE is an oversampling technique where the synthetic samples are generated for the minority class. This algorithm helps to overcome the overfitting problem posed by random oversampling.

How does smote oversampling work?

Rather than replicating the minority observations (e.g., defaulters, fraudsters, churners), Synthetic Minority Oversampling (SMOTE) works by creating synthetic observations based upon the existing minority observations (Chawla et al., 2002). For each minority class observation, SMOTE calculates the k nearest neighbors.

Is smote effective?

Results. While in most cases SMOTE seems beneficial with low-dimensional data, it does not attenuate the bias towards the classification in the majority class for most classifiers when data are high-dimensional, and it is less effective than random undersampling.

What is smote in ML?

SMOTE stands for Synthetic Minority Oversampling Technique. This is a statistical technique for increasing the number of cases in your dataset in a balanced way. SMOTE takes the entire dataset as an input, but it increases the percentage of only the minority cases.