water.util

Class MRUtils.ClassDist

java.lang.Object

jsr166y.ForkJoinTask<java.lang.Void>

jsr166y.CountedCompleter

water.H2O.H2OCountedCompleter<T>

water.DTask<T>

water.MRTask<MRUtils.ClassDist>

water.util.MRUtils.ClassDist

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.concurrent.Future<java.lang.Void>, ForkJoinPool.ManagedBlocker, Freezable<MRUtils.ClassDist>

Enclosing class:

MRUtils

public static class MRUtils.ClassDist
extends MRTask<MRUtils.ClassDist>

Compute the class distribution from a class label vector (not counting missing values) Usage 1: Label vector is categorical ------------------------------------ Vec label = ...; assert(label.isCategorical()); double[] dist = new ClassDist(label).doAll(label).dist(); Usage 2: Label vector is numerical ---------------------------------- Vec label = ...; int num_classes = ...; assert(label.isInt()); double[] dist = new ClassDist(num_classes).doAll(label).dist();

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class water.DTask

DTask.DKeyTask<T extends DTask.DKeyTask,V extends Keyed>, DTask.RemoveCall

Field Summary

Fields

Modifier and Type	Field and Description
protected double[]	_ys

Fields inherited from class water.MRTask

_appendables, _fr, _fs, _hi, _keys, _left, _lo, _nhi, _nleft, _nlo, _nrite, _rite, _run_local, _topLocal

Fields inherited from class water.DTask

_ex

Constructor Summary

Constructors

Constructor and Description
MRUtils.ClassDist(int n)
MRUtils.ClassDist(Vec label)

Method Summary

Methods

Modifier and Type	Method and Description
double[]	dist()
void	map(Chunk ys) Override with your map implementation.
void	map(Chunk ys, Chunk ws) Override with your map implementation.
void	reduce(MRUtils.ClassDist that) Override to combine results from 'mrt' into 'this' MRTask.
double[]	rel_dist()

Methods inherited from class water.MRTask

appendables, asyncExecOnAllNodes, block, closeLocal, compute2, dfork, dfork, dfork, dfork, dfork, dinvoke, doAll, doAll, doAll, doAll, doAll, doAll, doAll, doAll, doAll, doAll, doAll, doAll, doAllNodes, getResult, getResult, isReleasable, map, map, map, map, map, map, map, map, map, modifiesVolatileVecs, onCompletion, onExceptionalCompletion, outputFrame, outputFrame, outputFrame, postGlobal, profile, profString, self, setupLocal

Methods inherited from class water.DTask

copyOver, getDException, hasException, logVerbose, onAck, onAckAck, setException

Methods inherited from class water.H2O.H2OCountedCompleter

asBytes, clone, compute, compute1, currThrPriority, frozenType, icer, priority, read, readJSON, reloadFromBytes, write, writeJSON

Methods inherited from class jsr166y.CountedCompleter

__tryComplete, addToPendingCount, compareAndSetPendingCount, complete, exec, getCompleter, getPendingCount, getRawResult, setCompleter, setPendingCount, setRawResult, tryComplete

Methods inherited from class jsr166y.ForkJoinTask

adapt, adapt, adapt, cancel, compareAndSetForkJoinTaskTag, completeExceptionally, fork, get, get, getException, getForkJoinTaskTag, getPool, getQueuedTaskCount, getSurplusQueuedTaskCount, helpQuiesce, inForkJoinPool, invoke, invokeAll, invokeAll, invokeAll, isCancelled, isCompletedAbnormally, isCompletedNormally, isDone, join, peekNextLocalTask, pollNextLocalTask, pollTask, quietlyComplete, quietlyInvoke, quietlyJoin, reinitialize, setForkJoinTaskTag, tryUnfork

Methods inherited from class java.lang.Object

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

Field Detail

_ys

protected double[] _ys

Constructor Detail

MRUtils.ClassDist

public MRUtils.ClassDist(Vec label)

MRUtils.ClassDist

public MRUtils.ClassDist(int n)

Method Detail

dist

public final double[] dist()

rel_dist

public final double[] rel_dist()

map

public void map(Chunk ys)

Description copied from class: MRTask

Override with your map implementation. This overload is given a single local input Chunk. It is meant for map/reduce jobs that use a single column in a input Frame. All map variants are called, but only one is expected to be overridden.

Overrides:

map in class MRTask<MRUtils.ClassDist>

map

public void map(Chunk ys,
       Chunk ws)

Description copied from class: MRTask

Override with your map implementation. This overload is given two local Chunks. All map variants are called, but only one is expected to be overridden.

Overrides:

map in class MRTask<MRUtils.ClassDist>

reduce

public void reduce(MRUtils.ClassDist that)

Description copied from class: MRTask

Override to combine results from 'mrt' into 'this' MRTask. Both 'this' and 'mrt' are guaranteed to either have map() run on them, or be the results of a prior reduce(). Reduce is optional if, e.g., the result is some output vector.

Overrides:

reduce in class MRTask<MRUtils.ClassDist>