org.apache.mahout.cf.taste.hadoop

Class TasteHadoopUtils

java.lang.Object

org.apache.mahout.cf.taste.hadoop.TasteHadoopUtils

public final class TasteHadoopUtils
extends Object

Some helper methods for the hadoop-related stuff in org.apache.mahout.cf.taste

Field Summary

Fields

Modifier and Type	Field and Description
static int	ITEM_ID_POS
static int	USER_ID_POS

Method Summary

Methods

Modifier and Type	Method and Description
static int	idToIndex(long id) Maps a long to an int with range of 0 to Integer.MAX_VALUE-1
static int	readID(String token, boolean usesLongIDs)
static OpenIntLongHashMap	readIDIndexMap(String idIndexPathStr, org.apache.hadoop.conf.Configuration conf) Reads a binary mapping file
static String[]	splitPrefTokens(CharSequence line) Splits a preference data line into string tokens

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

USER_ID_POS

public static final int USER_ID_POS

See Also:

Constant Field Values

ITEM_ID_POS

public static final int ITEM_ID_POS

See Also:

Constant Field Values

Method Detail

splitPrefTokens

public static String[] splitPrefTokens(CharSequence line)

Splits a preference data line into string tokens

idToIndex

public static int idToIndex(long id)

Maps a long to an int with range of 0 to Integer.MAX_VALUE-1

readID

public static int readID(String token,
         boolean usesLongIDs)

readIDIndexMap

public static OpenIntLongHashMap readIDIndexMap(String idIndexPathStr,
                                org.apache.hadoop.conf.Configuration conf)

Reads a binary mapping file