Move register to typical location. (#2662)

- Fixes #2462.

Author: brendan-ai2

allennlp/modules/seq2seq_encoders/__init__.py

@@ -95,6 +95,3 @@ def from_params(self, params: Params) -> PytorchSeq2SeqWrapper:
 Seq2SeqEncoder.register("augmented_lstm")(_Seq2SeqWrapper(AugmentedLstm))
 Seq2SeqEncoder.register("alternating_lstm")(_Seq2SeqWrapper(StackedAlternatingLstm))
 Seq2SeqEncoder.register("stacked_bidirectional_lstm")(_Seq2SeqWrapper(StackedBidirectionalLstm))
-Seq2SeqEncoder.register("bidirectional_language_model_transformer")(
-        BidirectionalLanguageModelTransformer
-)

allennlp/modules/seq2seq_encoders/bidirectional_language_model_transformer.py

@@ -192,6 +192,7 @@ def make_model(num_layers: int = 6,
     return model
 
 
+@Seq2SeqEncoder.register('bidirectional_language_model_transformer')
 class BidirectionalLanguageModelTransformer(Seq2SeqEncoder):
     def __init__(self,
                  input_dim: int,