urce">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">from ... import utils as U
from ...imports import *
from . import preprocessor as pp

BILSTM_CRF = &#34;bilstm-crf&#34;
BILSTM = &#34;bilstm&#34;
BILSTM_ELMO = &#34;bilstm-elmo&#34;
BILSTM_CRF_ELMO = &#34;bilstm-crf-elmo&#34;
BILSTM_TRANSFORMER = &#34;bilstm-transformer&#34;
SEQUENCE_TAGGERS = {
    BILSTM: &#34;Bidirectional LSTM (https://arxiv.org/abs/1603.01360)&#34;,
    BILSTM_TRANSFORMER: &#34;Bidirectional LSTM w/ t