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Interpreting Wowpal Wabbit Results: Why are Some Strings Added by "h"?

The following is part of the training journal for my VW model.

Why are some of these lines followed by h? You will notice that this is true for the line “average loss” in the summary at the end. I'm not sure what that means, or if I don't care.

...  
average    since         example     example  current  current  current    
loss       last          counter      weight    label  predict features    
1.000000   1.000000            1         1.0  -1.0000   0.0000       15    
0.500000   0.000000            2         2.0   1.0000   1.0000       15    
1.250000   2.000000            4         4.0  -1.0000   1.0000        9    
1.167489   1.084979            8         8.0  -1.0000   1.0000       29    
1.291439   1.415389           16        16.0   1.0000   1.0000       45    
1.096302   0.901166           32        32.0  -1.0000  -1.0000       21    
1.299807   1.503312           64        64.0  -1.0000   1.0000        7    
1.413753   1.527699          128       128.0  -1.0000   1.0000       11    
1.459430   1.505107          256       256.0  -1.0000   1.0000       47    
1.322658   1.185886          512       512.0  -1.0000  -1.0000       59    
1.193357   1.064056         1024      1024.0  -1.0000   1.0000       69    
1.145822   1.098288         2048      2048.0  -1.0000  -1.0000        5    
1.187072   1.228322         4096      4096.0  -1.0000  -1.0000        9    
1.093551   1.000031         8192      8192.0  -1.0000  -1.0000       67    
1.041445   0.989338        16384     16384.0  -1.0000  -0.6838       29    
1.107593   1.173741        32768     32768.0   1.0000  -1.0000        5    
1.147313   1.187034        65536     65536.0  -1.0000   1.0000        7    
1.078471   1.009628       131072    131072.0  -1.0000  -1.0000       73    
1.004700   1.004700       262144    262144.0  -1.0000   1.0000       41 h  
0.918594   0.832488       524288    524288.0  -1.0000  -1.0000        7 h  
0.868978   0.819363      1048576   1048576.0  -1.0000  -1.0000       21 h  

finished run  
number of examples per pass = 152064  
passes used = 10  
weighted example sum = 1.52064e+06  
weighted label sum = -854360  
average loss = 0.809741 h  
...

thank

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2 answers

This one hprints when

(!all.holdout_set_off && all.current_pass >= 1)

true (see output from grep -nH -e '\<h\\n' vowpalwabbit/*.ccand view code).

Find --holdout_offin Command Line Arguments :

- holdout_off . VW ( = 1/10) , --passes > 1 . . h , , .

+5

VW ( "h" ). , ( --passes n), k- ( --holdout_period k) . , "h". "h" "h" , , . , , --holdout_off. 10% ( --holdout_period 10).

+6

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