$ opencv_traincascade -data cascade -vec samples/positives.vec -bg negative_samples -numStages 20 -precalcValBufSize 10 -precalcIdxBufSize 200 -acceptanceRatioBreakValue 0.0001 -w 50 -h 50 -mode ALL -maxWeakCount 100 -maxDepth 1 -weightTrimRate 0.95
PARAMETERS:
cascadeDirName: cascade
vecFileName: samples/positives.vec
bgFileName: negative_samples
numPos: 2000
numNeg: 1000
numStages: 20
precalcValBufSize[Mb] : 10
precalcIdxBufSize[Mb] : 200
acceptanceRatioBreakValue : 0.0001
stageType: BOOST
featureType: HAAR
sampleWidth: 50
sampleHeight: 50
boostType: GAB
minHitRate: 0.995
maxFalseAlarmRate: 0.5
weightTrimRate: 0.95
maxDepth: 1
maxWeakCount: 100
mode: ALL
Number of unique features given windowSize [50,50] : 5005351

===== TRAINING 0-stage =====
<BEGIN
POS count : consumed   2000 : 2000
NEG count : acceptanceRatio    1000 : 1
Precalculation time: 8.716
+----+---------+---------+
|  N |    HR   |    FA   |
+----+---------+---------+
|   1|   0.9995|    0.011|
+----+---------+---------+
END>
Training until now has taken 0 days 1 hours 5 minutes 58 seconds.

===== TRAINING 1-stage =====
<BEGIN
POS count : consumed   2000 : 2001
NEG count : acceptanceRatio    1000 : 0.0122336
Precalculation time: 12.277
+----+---------+---------+
|  N |    HR   |    FA   |
+----+---------+---------+
|   1|        1|        1|
+----+---------+---------+
|   2|        1|    0.287|
+----+---------+---------+
END>
Training until now has taken 0 days 2 hours 26 minutes 57 seconds.

===== TRAINING 2-stage =====
<BEGIN
POS count : consumed   2000 : 2001
NEG count : acceptanceRatio    1000 : 0.00352168
Precalculation time: 5.118
+----+---------+---------+
|  N |    HR   |    FA   |
+----+---------+---------+
|   1|        1|        1|
+----+---------+---------+
|   2|        1|    0.114|
+----+---------+---------+
END>
Training until now has taken 0 days 3 hours 31 minutes 55 seconds.

===== TRAINING 3-stage =====
<BEGIN
POS count : consumed   2000 : 2001
NEG count : acceptanceRatio    1000 : 0.000405367
Precalculation time: 4.813
+----+---------+---------+
|  N |    HR   |    FA   |
+----+---------+---------+
|   1|        1|        0|
+----+---------+---------+
END>
Training until now has taken 0 days 4 hours 32 minutes 57 seconds.

===== TRAINING 4-stage =====
<BEGIN
POS count : consumed   2000 : 2001
Train dataset for temp stage can not be filled. Branch training terminated.