add validation_step and test_step to WAE application

deeplay/applications/autoencoders/wae.py

@@ -126,6 +126,46 @@ def training_step(self, batch, batch_idx):
 
         return sum(loss.values())
 
+    def validation_step(self, batch, batch_idx):
+        x, y = self.val_preprocess(batch)
+        y_hat, z = self(x)
+        rec_loss, mmd_loss = self.compute_loss(y_hat, y, z)
+        loss = {
+            "rec_loss": rec_loss,
+            "mmd_loss": mmd_loss,
+        }
+        for name, v in loss.items():
+            self.log(
+                f"val_{name}",
+                v,
+                on_step=True,
+                on_epoch=True,
+                prog_bar=True,
+                logger=True,
+            )
+
+        return sum(loss.values())
+
+    def test_step(self, batch, batch_idx):
+        x, y = self.test_preprocess(batch)
+        y_hat, z = self(x)
+        rec_loss, mmd_loss = self.compute_loss(y_hat, y, z)
+        loss = {
+            "rec_loss": rec_loss,
+            "mmd_loss": mmd_loss,
+        }
+        for name, v in loss.items():
+            self.log(
+                f"test_{name}",
+                v,
+                on_step=True,
+                on_epoch=True,
+                prog_bar=True,
+                logger=True,
+            )
+
+        return sum(loss.values())
+
     def compute_IMQ(self, x1, x2):
         # Inverse MultiQuadratic kernel
         C = 2 * self.latent_dim * self.z_var