smile.data

Interface BinarySparseDataset

All Superinterfaces:

Dataset<int[]>

public interface BinarySparseDataset
extends Dataset<int[]>

Binary sparse dataset. Each item is stored as an integer array, which are the indices of nonzero elements in ascending order.

Method Summary

Modifier and Type	Method and Description
static BinarySparseDataset	from(java.nio.file.Path path) Parse a binary sparse dataset from a file, of which each line is a data item which are the indices of nonzero elements.
default int	get(int i, int j) Returns the binary value at entry (i, j) by binary search.
int	length() Returns the number of nonzero entries.
int	ncols() Returns the number of columns.
static BinarySparseDataset	of(java.util.Collection<int[]> data) Returns a default implementation of BinarySparseDataset from a collection.
smile.math.matrix.SparseMatrix	toMatrix() Returns the Harwell-Boeing column-compressed sparse matrix.

Methods inherited from interface smile.data.Dataset

apply, distributed, get, isEmpty, of, size, stream, toDataset, toMatrix, toString

Method Detail

length

int length()

Returns the number of nonzero entries.

ncols

int ncols()

Returns the number of columns.

get

default int get(int i,
                int j)

Returns the binary value at entry (i, j) by binary search.

Parameters:

i - the row index.

j - the column index.

toMatrix

smile.math.matrix.SparseMatrix toMatrix()

Returns the Harwell-Boeing column-compressed sparse matrix.

of

static BinarySparseDataset of(java.util.Collection<int[]> data)

Returns a default implementation of BinarySparseDataset from a collection.

Parameters:

data - Each row is a data item which are the indices of nonzero elements. Every row will be sorted into ascending order.

from

static BinarySparseDataset from(java.nio.file.Path path)
                         throws java.io.IOException,
                                java.lang.NumberFormatException

Parse a binary sparse dataset from a file, of which each line is a data item which are the indices of nonzero elements.

Parameters:

path - the input file path.

Throws:

java.io.IOException - if stream to file cannot be read or closed.

java.lang.NumberFormatException - if an entry is not an integer.