Package smile.data

Interface Dataset<T>

Type Parameters:
T - the type of data objects.
All Known Subinterfaces:
BinarySparseDataset, DataFrame, SparseDataset
All Known Implementing Classes:
IndexDataFrame
public interface Dataset<T>
An immutable collection of data objects.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Interface
    Description
    static interface 
    Dataset.Collectors
    Stream collectors.

  • Method Summary

    Modifier and Type
    Method
    Description
    default T
    apply(int i)
    Returns the element at the specified position in this dataset.
    default boolean
    distributed()
    Returns true if the dataset is distributed over multiple machines.
    T
    get(int i)
    Returns the element at the specified position in this dataset.
    default boolean
    isEmpty()
    Returns true if the dataset is empty.
    static <T> Dataset<T>
    of(Collection<T> data)
    Returns a default implementation of Dataset from a collection.
    int
    size()
    Returns the number of elements in this collection.
    Stream<T>
    stream()
    Returns a (possibly parallel) Stream with this collection as its source.
    default List<T>
    toList()
    Returns the List of data items.
    default String
    toString(int numRows)
    Returns the string representation of the dataset.

  • Method Details

    • distributed

      default boolean distributed()
      Returns true if the dataset is distributed over multiple machines.
      Returns:
      true if the dataset is distributed over multiple machines.

    • size

      int size()
      Returns the number of elements in this collection.
      Returns:
      the number of elements in this collection.

    • isEmpty

      default boolean isEmpty()
      Returns true if the dataset is empty.
      Returns:
      true if the dataset is empty.

    • get

      T get(int i)
      Returns the element at the specified position in this dataset.
      Parameters:
      i - the index of the element to be returned.
      Returns:
      the i-th element.

    • apply

      default T apply(int i)
      Returns the element at the specified position in this dataset.
      Parameters:
      i - the index of the element to be returned.
      Returns:
      the i-th element.

    • stream

      Stream<T> stream()
      Returns a (possibly parallel) Stream with this collection as its source.
      Returns:
      a (possibly parallel) Stream with this collection as its source.

    • toList

      default List<T> toList()
      Returns the List of data items.
      Returns:
      the List of data items.

    • toString

      default String toString(int numRows)
      Returns the string representation of the dataset.
      Parameters:
      numRows - the number of rows to show.
      Returns:
      the string representation of the dataset.

    • of

      static <T> Dataset<T> of(Collection<T> data)
      Returns a default implementation of Dataset from a collection.
      Type Parameters:
      T - the type of input elements.
      Parameters:
      data - the data collection.
      Returns:
      the dataset.