Fix Glow-TTS multi-speaker inference

TTS/tts/models/glow_tts.py

@@ -170,6 +170,8 @@ class GlowTTS(BaseTTS):
         if g is not None:
             if hasattr(self, "emb_g"):
                 # use speaker embedding layer
+                if not g.size(): # if is a scalar
+                    g = g.unsqueeze(0) # unsqueeze
                 g = F.normalize(self.emb_g(g)).unsqueeze(-1)  # [b, h, 1]
             else:
                 # use d-vector