adjustThreshold
PURPOSE ![^](../up.png)
function [ab, clErr] = adjustThreshold(ab, trainingExamples, targetOuts, reqDetRate)
SYNOPSIS ![^](../up.png)
function [ab, clErr, resDetRate] = adjustThreshold(ab, trainingExamples, targetOuts, reqDetRate)
DESCRIPTION ![^](../up.png)
CROSS-REFERENCE INFORMATION ![^](../up.png)
This function calls:
This function is called by:
- learn function [ab, err] = learn(ab, trnExamples, targetOuts, nStages, reqDetRate)
SOURCE CODE ![^](../up.png)
0001 function [ab, clErr, resDetRate] = adjustThreshold(ab, trainingExamples, targetOuts, reqDetRate)
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0016 [clOuts, realOuts] = computeOutputs(ab, trainingExamples);
0017 posVal = getPosVal(ab);
0018 negVal = getNegVal(ab);
0019 posIndxs = find(targetOuts == posVal);
0020 numPos = length(posIndxs);
0021 targetPos = ceil(numPos * reqDetRate);
0022 numDetPos = sum(clOuts == posVal & targetOuts == posVal);
0023 if targetPos > numDetPos,
0024
0025
0026 cmpSign = sign(posVal - negVal);
0027 if cmpSign > 0,
0028 sortMode = 'ascend';
0029 else
0030 sortMode = 'descend';
0031 end
0032 sortedPosOuts = sort(realOuts(posIndxs), sortMode);
0033 ab.thresh = sortedPosOuts(numPos - targetPos + 1);
0034 clOuts = computeOutputs(ab, trainingExamples);
0035 end
0036 clErr = sum(clOuts ~= targetOuts) / length(clOuts);
0037 resDetRate = sum((targetOuts == posVal) & (clOuts == posVal)) / ...
0038 sum((targetOuts == posVal));
0039 ab.detectionRate = resDetRate;
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