Epoch loss (#201)

* update

* update

Author: a-r-r-o-w

finetrainers/trainer.py

@@ -673,6 +673,8 @@ def train(self) -> None:
 
             self.transformer.train()
             models_to_accumulate = [self.transformer]
+            epoch_loss = 0.0
+            num_loss_updates = 0
 
             for step, batch in enumerate(self.dataloader):
                 logger.debug(f"Starting step {step + 1}")
@@ -843,14 +845,20 @@ def train(self) -> None:
                     if should_run_validation:
                         self.validate(global_step)
 
-                logs["loss"] = loss.detach().item()
+                loss_item = loss.detach().item()
+                epoch_loss += loss_item
+                num_loss_updates += 1
+                logs["step_loss"] = loss_item
                 logs["lr"] = self.lr_scheduler.get_last_lr()[0]
                 progress_bar.set_postfix(logs)
                 accelerator.log(logs, step=global_step)
 
                 if global_step >= self.state.train_steps:
                     break
 
+            if num_loss_updates > 0:
+                epoch_loss /= num_loss_updates
+            accelerator.log({"epoch_loss": epoch_loss}, step=global_step)
             memory_statistics = get_memory_statistics()
             logger.info(f"Memory after epoch {epoch + 1}: {json.dumps(memory_statistics, indent=4)}")