Add `model_input_keys`for g2p model (#4)

- Add `model_input_keys`for g2p model (e5bb52b7ca562bdacc71cdef9f2fd525e22f68cc)


Co-authored-by: sdelangen <sdelangen@users.noreply.huggingface.co>

hyperparams.yaml

@@ -304,6 +304,11 @@ beam_searcher_valid: !new:speechbrain.decoders.S2SRNNBeamSearcher
 
 homograph_extractor: !new:speechbrain.lobes.models.g2p.homograph.SubsequenceExtractor
 
+# keys to forward from the encoding pipeline to the model
+model_input_keys:
+- grapheme_encoded
+- word_emb
+
 model_output_keys:
 - p_seq
 - char_lens