Scientific Programming / 2018 / Article / Alg 1

Research Article

A Low-Cost Named Entity Recognition Research Based on Active Learning

Algorithm 1

The pseudocode of AL-CRF.
Initialization: unlabelled dataset , , , , initialization data number , additional number in iteration
// k-means clustering
select cluster centers randomly as
do
for in do
  for in do
   if is then
    the cluster of is
   end
  end
end
 update to
while
output the clustered dataset
select samples from by stratified sampling
annotate samples into
train CRFs by
calculate the F-value of CRFs as
while do
 calculate entropy in
 rank the according to the entropy
 annotate top samples into
 train CRFs by
 calculate the F-value of CRFs as
end

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