Add freeze vocoder generator and flow-based decoder option

TTS/tts/models/vits.py

@@ -225,6 +225,8 @@ class VitsArgs(Coqpit):
     freeze_encoder: bool = False
     freeze_DP: bool = False
     freeze_PE: bool = False
+    freeze_flow_decoder: bool = False
+    freeze_waveform_decoder: bool = False
 
 
 
@@ -787,6 +789,8 @@ class Vits(BaseTTS):
         if self.args.freeze_encoder:
             for param in self.text_encoder.parameters():
                 param.requires_grad = False
+
+            if hasattr(self, 'emb_l'):
                 for param in self.emb_l.parameters():
                     param.requires_grad = False
 
@@ -798,6 +802,14 @@ class Vits(BaseTTS):
             for param in self.duration_predictor.parameters():
                 param.requires_grad = False
 
+        if self.args.freeze_flow_decoder:
+            for param in self.flow.parameters():
+                param.requires_grad = False
+
+        if self.args.freeze_waveform_decoder:
+            for param in self.waveform_decoder.parameters():
+                param.requires_grad = False
+
         if optimizer_idx == 0:
             text_input = batch["text_input"]
             text_lengths = batch["text_lengths"]