Add TorchScript test for `F.phase_vocoder` (#1379)

test/torchaudio_unittest/functional/torchscript_consistency_impl.py

@@ -547,6 +547,21 @@ class Functional(common_utils.TestBaseMixin):
         tensor = common_utils.get_whitenoise(sample_rate=44100)
         self._assert_consistency(func, tensor)
 
+    def test_phase_vocoder(self):
+        def func(tensor, device: torch.device = self.device):
+            rate = 0.5
+            hop_length = 256
+            phase_advance = torch.linspace(
+                0,
+                3.14 * hop_length,
+                tensor.shape[-3],
+                dtype=torch.float64,
+            ).to(device)[..., None]
+            return F.phase_vocoder(tensor, rate, phase_advance)
+
+        tensor = torch.randn(2, 1025, 400, 2)
+        self._assert_consistency(func, tensor)
+
     @common_utils.skipIfNoKaldi
     def test_compute_kaldi_pitch(self):
         if self.dtype != torch.float32 or self.device != torch.device('cpu'):