/usr/share/doc/vowpal-wabbit-doc/examples/test/train-sets/ref/active_cover.stderr is in vowpal-wabbit-doc 8.1.1-1.
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The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | final_regressor = models/active_cover.model
Num weight bits = 18
learning rate = 0.5
initial_t = 0
power_t = 0.5
using no cache
Reading datafile = train-sets/rcv1_mini.dat
num sources = 1
average since example example current current current
loss last counter weight label predict features
0.000000 0.000000 1 1.0 -1.0000 -1.0000 128
0.000000 0.000000 2 2.0 -1.0000 -1.0000 44
0.198047 0.327943 4 5.0 -1.0000 -1.0000 190
0.291861 0.372267 7 10.9 unknown -1.0000 56
0.139598 0.000000 17 22.9 unknown -1.0000 193
0.124307 0.109523 35 46.5 unknown -1.0000 48
0.191617 0.258261 67 93.5 -1.0000 -1.0000 82
0.226939 0.261907 138 188.0 1.0000 -1.0000 106
0.150954 0.075273 250 376.8 unknown -1.0000 129
finished run
number of examples per pass = 250
passes used = 1
weighted example sum = 376.776421
weighted label sum = 12.994223
average loss = 0.150954
best constant = 0.116790
best constant's loss = 0.691445
total feature number = 19393
total queries = 96
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