Add scalar_mix_parameters to ElmoTokenEmbedder.from_params (#1956)

Sorry, continuation of #1955 . Was able to run a model with this setting, so pretty sure I got it right this time around...

Author: nelson-liu

allennlp/modules/token_embedders/elmo_token_embedder.py

@@ -114,11 +114,13 @@ def from_params(cls, vocab: Vocabulary, params: Params) -> 'ElmoTokenEmbedder':
         else:
             vocab_to_cache = None
         projection_dim = params.pop_int("projection_dim", None)
+        scalar_mix_parameters = params.pop('scalar_mix_parameters', None)
         params.assert_empty(cls.__name__)
         return cls(options_file=options_file,
                    weight_file=weight_file,
                    do_layer_norm=do_layer_norm,
                    dropout=dropout,
                    requires_grad=requires_grad,
                    projection_dim=projection_dim,
-                   vocab_to_cache=vocab_to_cache)
+                   vocab_to_cache=vocab_to_cache,
+                   scalar_mix_parameters=scalar_mix_parameters)