lib/mining: realign struct for better size allocation

The realignment reduce the cost of the following struct,

* classifier/cart.Runtime: from 40 to 16 bytes (-24)
* classifier/cart.NodeValue: from 72 to 40 bytes (-32)
* classifier.CM: from 184 to 152 bytes (-32)
* classifier/crf.Runtime: from 376 to 312 bytes (-64)
* classifier/rf.Runtime: from 336 to 304 bytes (-32)
* classifier.Runtime: from 256 to 112 bytes (-144)
* gain/gini.Gini: from 152 to 104 bytes (-48)
* knn.Runtime: from 56 to 32 bytes (-24)
* resampling/lnsmote.Runtime: from 232 to 224 bytes (-8)
* resampling/smote.Runtime: from 144 to 128 bytes (-16)

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/mining/classifier/stat.go b/lib/mining/classifier/stat.go
index f7aa8a50..514da3bd 100644
--- a/lib/mining/classifier/stat.go
+++ b/lib/mining/classifier/stat.go
@@ -16,39 +16,55 @@ import (
 type Stat struct {
 	// ID unique id for this statistic (e.g. number of tree).
 	ID int64
+
 	// StartTime contain the start time of classifier in unix timestamp.
 	StartTime int64
+
 	// EndTime contain the end time of classifier in unix timestamp.
 	EndTime int64
+
 	// ElapsedTime contain actual time, in seconds, between end and start
 	// time.
 	ElapsedTime int64
+
 	// TP contain true-positive value.
 	TP int64
+
 	// FP contain false-positive value.
 	FP int64
+
 	// TN contain true-negative value.
 	TN int64
+
 	// FN contain false-negative value.
 	FN int64
+
 	// OobError contain out-of-bag error.
 	OobError float64
+
 	// OobErrorMean contain mean of out-of-bag error.
 	OobErrorMean float64
+
 	// TPRate contain true-positive rate (recall): tp/(tp+fn)
 	TPRate float64
+
 	// FPRate contain false-positive rate: fp/(fp+tn)
 	FPRate float64
+
 	// TNRate contain true-negative rate: tn/(tn+fp)
 	TNRate float64
+
 	// Precision contain: tp/(tp+fp)
 	Precision float64
+
 	// FMeasure contain value of F-measure or the harmonic mean of
 	// precision and recall.
 	FMeasure float64
+
 	// Accuracy contain the degree of closeness of measurements of a
 	// quantity to that quantity's true value.
 	Accuracy float64
+
 	// AUC contain the area under curve.
 	AUC float64
 }