forked from ewalker544/libsvm-go
/
crossvalidation.go
56 lines (48 loc) · 1.57 KB
/
crossvalidation.go
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/*
** Copyright 2014 Edward Walker
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http ://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
**
** @author: Ed Walker
*/
package main
import (
"fmt"
"github.com/ewalker544/libsvm-go"
)
func doCrossValidation(prob *libSvm.Problem, param *libSvm.Parameter, nrFold int) {
targets := libSvm.CrossValidation(prob, param, nrFold)
if param.SvmType == libSvm.EPSILON_SVR || param.SvmType == libSvm.NU_SVR {
squareErr := libSvm.NewSquareErrorComputer()
var i int = 0
for prob.Begin(); !prob.Done(); prob.Next() {
y, _ := prob.GetLine()
v := targets[i]
squareErr.Sum(v, y)
i++
}
fmt.Fprintf(outFP, "Cross Validation Mean squared error = %.6g\n", squareErr.MeanSquareError())
fmt.Fprintf(outFP, "Cross Validation Squared correlation coefficient = %.6g\n", squareErr.SquareCorrelationCoeff())
} else {
var i int = 0
var correct int = 0
for prob.Begin(); !prob.Done(); prob.Next() {
y, _ := prob.GetLine()
if targets[i] == y {
correct++
}
i++
}
fmt.Fprintf(outFP, "Cross Validation Accuracy = %.6g%%\n", 100*float64(correct)/float64(prob.ProblemSize()))
}
}