RDS-653: Use eval mode for inference during sampling in ACTGAN.

GitOrigin-RevId: 046cf888d7018be1d3552c966cb411d84b40de7c

src/gretel_synthetics/actgan/actgan.py

@@ -551,6 +551,8 @@ def sample(
         else:
             global_condition_vec = None
 
+        # Switch generator to eval mode for inference
+        self._generator.eval()
         steps = n // self._batch_size + 1
         data = []
         for _ in range(steps):
@@ -574,6 +576,8 @@ def sample(
             fakeact = self._apply_activate(fake)
             data.append(fakeact.detach().cpu().numpy())
 
+        # Switch generator back to train mode now that inference is complete
+        self._generator.train()
         data = np.concatenate(data, axis=0)
         data = data[:n]