Remove the unused code in modules.py (#346)

modules.py

@@ -578,20 +578,3 @@ def forward(self, x, x_mask, g=None, reverse=False):
             x1 = (x1 - m) * torch.exp(-logs) * x_mask
             x = torch.cat([x0, x1], 1)
             return x
-
-        x1, logabsdet = piecewise_rational_quadratic_transform(
-            x1,
-            unnormalized_widths,
-            unnormalized_heights,
-            unnormalized_derivatives,
-            inverse=reverse,
-            tails="linear",
-            tail_bound=self.tail_bound,
-        )
-
-        x = torch.cat([x0, x1], 1) * x_mask
-        logdet = torch.sum(logabsdet * x_mask, [1, 2])
-        if not reverse:
-            return x, logdet
-        else:
-            return x