Fix validation in G2PModel and ThutmoseTaggerModel (#7597)

Signed-off-by: Abhishree <[email protected]>

nemo/collections/nlp/models/text_normalization_as_tagging/thutmose_tagger.py

@@ -236,14 +236,15 @@ def validation_step(self, batch, batch_idx):
         val_loss_tag = self.loss_fn(logits=tag_logits, labels=tag_labels, loss_mask=labels_mask)
         val_loss_semiotic = self.loss_fn(logits=semiotic_logits, labels=semiotic_labels, loss_mask=labels_mask)
         val_loss = val_loss_tag + val_loss_semiotic
+        self.validation_step_outputs.append(val_loss)
         return {'val_loss': val_loss}
 
-    def on_validation_epoch_end(self, outputs):
+    def on_validation_epoch_end(self):
         """
         Called at the end of validation to aggregate outputs.
         :param outputs: list of individual outputs of each validation step.
         """
-        avg_loss = torch.stack([x['val_loss'] for x in outputs]).mean()
+        avg_loss = torch.stack([x['val_loss'] for x in self.validation_step_outputs]).mean()
 
         # calculate metrics and classification report
         # In our task recall = accuracy, and the recall column - is the per class accuracy
@@ -269,19 +270,21 @@ def on_validation_epoch_end(self, outputs):
         self.tag_multiword_classification_report.reset()
         self.semiotic_classification_report.reset()
 
+        self.validation_step_outputs.clear()  # free memory
+
     def test_step(self, batch, batch_idx):
         """
         Lightning calls this inside the test loop with the data from the test dataloader
         passed in as `batch`.
         """
         return self.validation_step(batch, batch_idx)
 
-    def on_test_epoch_end(self, outputs):
+    def on_test_epoch_end(self):
         """
         Called at the end of test to aggregate outputs.
         :param outputs: list of individual outputs of each test step.
         """
-        return self.on_validation_epoch_end(outputs)
+        return self.on_validation_epoch_end()
 
     # Functions for inference
     @torch.no_grad()

nemo/collections/tts/g2p/models/t5.py

@@ -170,7 +170,18 @@ def validation_step(self, batch, batch_idx, dataloader_idx=0, split="val"):
         )
         generated_str, _, _ = self._generate_predictions(input_ids=input_ids, model_max_target_len=self.max_target_len)
         per = word_error_rate(hypotheses=generated_str, references=labels_str, use_cer=True)
-        return {f"{split}_loss": val_loss, 'per': per}
+        output = {f"{split}_loss": val_loss, 'per': per}
+        if split == 'val':
+            if isinstance(self.trainer.val_dataloaders, (list, tuple)) and len(self.trainer.val_dataloaders) > 1:
+                self.validation_step_outputs[dataloader_idx].append(output)
+            else:
+                self.validation_step_outputs.append(output)
+        else:
+            if isinstance(self.trainer.test_dataloaders, (list, tuple)) and len(self.trainer.test_dataloaders) > 1:
+                self.test_step_outputs[dataloader_idx].append(output)
+            else:
+                self.test_step_outputs.append(output)
+        return output
 
     def test_step(self, batch, batch_idx, dataloader_idx=0):
         """