glow-tts fix for saving inverse weight

TTS/tts/layers/glow_tts/glow.py

@@ -128,8 +128,9 @@ class InvConvNear(nn.Module):
         return z, logdet
 
     def store_inverse(self):
-        self.weight_inv = torch.inverse(
+        weight_inv = torch.inverse(
             self.weight.float()).to(dtype=self.weight.dtype)
+        self.weight_inv = nn.Parameter(weight_inv, requires_grad=False)
 
 
 class CouplingBlock(nn.Module):