Add feedforward_from_vocab

combo/modules/feedforward_predictor.py

@@ -11,6 +11,7 @@ from combo.utils import ConfigurationError
 
 
 @Registry.register("feedforward_predictor")
+@Registry.register("feedforward_predictor_from_vocab", constructor_method="from_vocab")
 class FeedForwardPredictor(Predictor):
     """Feedforward predictor. Should be used on top of Seq2Seq encoder."""
 
@@ -56,6 +57,7 @@ class FeedForwardPredictor(Predictor):
         return loss.sum() / valid_positions
 
     @classmethod
+    @register_arguments
     def from_vocab(cls,
                    vocabulary: Vocabulary,
                    vocab_namespace: str,
@@ -74,9 +76,12 @@ class FeedForwardPredictor(Predictor):
             f"There is not {vocab_namespace} in created vocabs, check if this field has any values to predict!"
         hidden_dims = hidden_dims + [vocabulary.get_vocab_size(vocab_namespace)]
 
-        return cls(FeedForward(
+        ff_p = cls(FeedForward(
             input_dim=input_dim,
             num_layers=num_layers,
             hidden_dims=hidden_dims,
             activations=activations,
             dropout=dropout))
+
+        ff_p.constructed_from = "from_vocab"
+        return ff_p
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