PHP Manual
SVM
Test training params on subsets of the training data

SVM::crossvalidate

(PECL svm >= 0.1.0)

SVM::crossvalidate — Test training params on subsets of the training data

说明

public svm::crossvalidate ( array $problem , int $number_of_folds ) : float

Crossvalidate can be used to test the effectiveness of the current parameter set on a subset of the training data. Given a problem set and a n "folds", it separates the problem set into n subsets, and the repeatedly trains on one subset and tests on another. While the accuracy will generally be lower than a SVM trained on the enter data set, the accuracy score returned should be relatively useful, so it can be used to test different training parameters.

参数

problem: The problem data. This can either be in the form of an array, the URL of an SVMLight formatted file, or a stream to an opened SVMLight formatted datasource.
number_of_folds: The number of sets the data should be divided into and cross tested. A higher number means smaller training sets and less reliability. 5 is a good number to start with.

返回值

The correct percentage, expressed as a floating point number from 0-1. In the case of NU_SVC or EPSILON_SVR kernels the mean squared error will returned instead.

参见

SVM::train() - Create a SVMModel based on training data

php data structures the collection interface php eventbuffer substracts a portion of the buffer data php ffi releases an unmanaged data structure php apcu 函数 retrieves cached information from apcu s data store php cubrid 函数 import blob/clob data from a file php filepro 函数 retrieves data from a filepro database php firebird/interbase 函数 open blob for retrieving data parts php sqlite 函数 execute a query that does not prefetch and buffer all data php gearmanclient send data to all job servers to see if they echo it back deprecated php harudoc read data from the temporary stream php sdo 函数 test to see if this sdo model type is an abstract data type php sdo 函数 test to see if this sdo model type is a primitive data type php sdo 函数 test for an sdo dataobject being an instance of this sdo model type php 范例 working with sequenced data objects php sessionhandler write session data php splobjectstorage returns the data associated with the current iterator entry php svm test training params on subsets of the training data php svm return the current training parameters php svm set training parameters php svm create a svmmodel based on training data