org.apache.mahout.classifier.df
Class DFUtils

java.lang.Object
  org.apache.mahout.classifier.df.DFUtils

public final class DFUtils
extends Object

Utility class that contains various helper methods

Method Summary

static String	elapsedTime(long milli) Formats a time interval in milliseconds to a String in the form "hours:minutes:seconds:millis"
static org.apache.hadoop.fs.Path[]	listOutputFiles(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path outputPath) Return a list of all files in the output directory
static double[]	readDoubleArray(DataInput in) Reads a double[] from a DataInput
static int[]	readIntArray(DataInput in) Reads an int[] from a DataInput
static Node[]	readNodeArray(DataInput in) Reads a Node[] from a DataInput
static void	storeWritable(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.fs.Path path, org.apache.hadoop.io.Writable writable)
static void	writeArray(DataOutput out, double[] array) Writes a double[] into a DataOutput
static void	writeArray(DataOutput out, int[] array) Writes an int[] into a DataOutput
static void	writeArray(DataOutput out, Node[] array) Writes an Node[] into a DataOutput

Methods inherited from class java.lang.Object

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

Method Detail

writeArray

public static void writeArray(DataOutput out,
                              Node[] array)
                       throws IOException

Writes an Node[] into a DataOutput

Throws:

IOException

readNodeArray

public static Node[] readNodeArray(DataInput in)
                            throws IOException

Reads a Node[] from a DataInput

Throws:

IOException

writeArray

public static void writeArray(DataOutput out,
                              double[] array)
                       throws IOException

Writes a double[] into a DataOutput

Throws:

IOException

readDoubleArray

public static double[] readDoubleArray(DataInput in)
                                throws IOException

Reads a double[] from a DataInput

Throws:

IOException

writeArray

public static void writeArray(DataOutput out,
                              int[] array)
                       throws IOException

Writes an int[] into a DataOutput

Throws:

IOException

readIntArray

public static int[] readIntArray(DataInput in)
                          throws IOException

Reads an int[] from a DataInput

Throws:

IOException

listOutputFiles

public static org.apache.hadoop.fs.Path[] listOutputFiles(org.apache.hadoop.fs.FileSystem fs,
                                                          org.apache.hadoop.fs.Path outputPath)
                                                   throws IOException

Return a list of all files in the output directory

Throws:

IOException - if no file is found

elapsedTime

public static String elapsedTime(long milli)

Formats a time interval in milliseconds to a String in the form "hours:minutes:seconds:millis"

storeWritable

public static void storeWritable(org.apache.hadoop.conf.Configuration conf,
                                 org.apache.hadoop.fs.Path path,
                                 org.apache.hadoop.io.Writable writable)
                          throws IOException

Throws:

IOException