Updated tagger with unknown value threshold

UD_any/tagger/machine.rm

 Name : Tagger Machine
-Classifier : tagger CNN(4,2,0,{FORM,UPOS},{-1,0,1},{},{ID,FORM},{1,10},-1,-1) data/tagger.ts
+Classifier : tagger CNN(2,4,2,0,{FORM,UPOS},{-1,0,1},{},{ID,FORM},{1,10},-1,-1) data/tagger.ts
 Predictions : UPOS
 Strategy : sequential
   tagger tagger 1