ARFF

ARFF file format serializer and deserializer

An ARFF (Attribute-Relation File Format) file is an ASCII text file that describes a list of instances sharing a set of attributes. Its main use is in data science to store tabular data: rows are instances and columns are attributes. Meta data such as attribute (column) names, data types, and comments are included in the file format.

Usage

• ARFF is used as an input file format by the machine-learning tool Weka.
• The OpenML website provides data sets in ARFF and CSV formats.

The ARFF crate utilizes the power of Serde to allow serialization and deserialization of certain Rust types. The file format is relatively simple, so not all rust types are supported. As a general rule of thumb, data needs to be represented as a sequence of rows, and a row can be either a struct with named columns or a sequence with static length.

Example

This crate is not yet published at crates.io, so your Cargo.toml needs to link to the repository directly. toml [dependencies] arff = { git = "https://github.com/mbillingr/arff" }

```rust extern crate arff;

[macro_use]

extern crate serde_derive;

fn main() { let input = " @RELATION Data @ATTRIBUTE a NUMERIC @ATTRIBUTE b NUMERIC

@DATA 42, 9 7, 5";

#[derive(Debug, Deserialize)]
struct NamedRow {
    b: i32,  // order of fields does not matter
    a: i32,
}

let named_data: Vec<NamedRow> = arff::from_str(input).unwrap();
println!("{:?}", named_data);

let unnamed_data: Vec<[i32; 2]> = arff::from_str(input).unwrap();
println!("{:?}", unnamed_data);

} ```

License

The ARFF crate is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the ARFF crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.