update `extract_tts_spectrograms` for the new model API

TTS/bin/extract_tts_spectrograms.py

@@ -146,20 +146,22 @@ def inference(
         elif speaker_embeddings is not None:
             speaker_c = speaker_embeddings
 
-        model_output, *_ = model.inference_with_MAS(
+        outputs = model.inference_with_MAS(
             text_input, text_lengths, mel_input, mel_lengths, attn_mask, g=speaker_c
         )
+        model_output = outputs['model_outputs']
         model_output = model_output.transpose(1, 2).detach().cpu().numpy()
 
     elif "tacotron" in model_name:
-        _, postnet_outputs, *_ = model(
+        cond_input = {'speaker_ids': speaker_ids, 'x_vectors': speaker_embeddings}
+        outputs = model(
             text_input,
             text_lengths,
             mel_input,
             mel_lengths,
-            speaker_ids=speaker_ids,
-            speaker_embeddings=speaker_embeddings,
+            cond_input
         )
+        postnet_outputs = outputs['model_outputs']
         # normalize tacotron output
         if model_name == "tacotron":
             mel_specs = []