2 files changed, 57 insertions, 54 deletions

diff --git a/training/common.py b/training/common.py
index b6964a3..f5ab326 100644
--- a/training/common.py
+++ b/training/common.py
@@ -45,42 +45,44 @@ def generate_class_images(
 ):
     missing_data = [item for item in data_train if not item.class_image_path.exists()]
 
-    if len(missing_data) != 0:
-        batched_data = [
-            missing_data[i:i+sample_batch_size]
-            for i in range(0, len(missing_data), sample_batch_size)
-        ]
+    if len(missing_data) == 0:
+        return
 
-        pipeline = VlpnStableDiffusion(
-            text_encoder=text_encoder,
-            vae=vae,
-            unet=unet,
-            tokenizer=tokenizer,
-            scheduler=scheduler,
-        ).to(accelerator.device)
-        pipeline.set_progress_bar_config(dynamic_ncols=True)
+    batched_data = [
+        missing_data[i:i+sample_batch_size]
+        for i in range(0, len(missing_data), sample_batch_size)
+    ]
+
+    pipeline = VlpnStableDiffusion(
+        text_encoder=text_encoder,
+        vae=vae,
+        unet=unet,
+        tokenizer=tokenizer,
+        scheduler=scheduler,
+    ).to(accelerator.device)
+    pipeline.set_progress_bar_config(dynamic_ncols=True)
 
-        with torch.inference_mode():
-            for batch in batched_data:
-                image_name = [item.class_image_path for item in batch]
-                prompt = [item.cprompt for item in batch]
-                nprompt = [item.nprompt for item in batch]
+    with torch.inference_mode():
+        for batch in batched_data:
+            image_name = [item.class_image_path for item in batch]
+            prompt = [item.cprompt for item in batch]
+            nprompt = [item.nprompt for item in batch]
 
-                images = pipeline(
-                    prompt=prompt,
-                    negative_prompt=nprompt,
-                    height=sample_image_size,
-                    width=sample_image_size,
-                    num_inference_steps=sample_steps
-                ).images
+            images = pipeline(
+                prompt=prompt,
+                negative_prompt=nprompt,
+                height=sample_image_size,
+                width=sample_image_size,
+                num_inference_steps=sample_steps
+            ).images
 
-                for i, image in enumerate(images):
-                    image.save(image_name[i])
+            for i, image in enumerate(images):
+                image.save(image_name[i])
 
-        del pipeline
+    del pipeline
 
-        if torch.cuda.is_available():
-            torch.cuda.empty_cache()
+    if torch.cuda.is_available():
+        torch.cuda.empty_cache()
 
 
 def get_models(pretrained_model_name_or_path: str):
@@ -119,7 +121,7 @@ def add_placeholder_tokens(
     for (placeholder_token_id, initializer_token_id) in zip(placeholder_token_ids, initializer_token_ids):
         embeddings.add_embed(placeholder_token_id, initializer_token_id)
 
-    return placeholder_token_ids
+    return placeholder_token_ids, initializer_token_ids
 
 
 def loss_step(
@@ -127,7 +129,6 @@ def loss_step(
     noise_scheduler: DDPMScheduler,
     unet: UNet2DConditionModel,
     text_encoder: CLIPTextModel,
-    with_prior: bool,
     prior_loss_weight: float,
     seed: int,
     step: int,
@@ -138,16 +139,23 @@ def loss_step(
     latents = vae.encode(batch["pixel_values"]).latent_dist.sample().detach()
     latents = latents * 0.18215
 
+    generator = torch.Generator(device=latents.device).manual_seed(seed + step) if eval else None
+
     # Sample noise that we'll add to the latents
-    noise = torch.randn_like(latents)
+    noise = torch.randn(
+        latents.shape,
+        dtype=latents.dtype,
+        layout=latents.layout,
+        device=latents.device,
+        generator=generator
+    )
     bsz = latents.shape[0]
     # Sample a random timestep for each image
-    timesteps_gen = torch.Generator(device=latents.device).manual_seed(seed + step) if eval else None
     timesteps = torch.randint(
         0,
         noise_scheduler.config.num_train_timesteps,
         (bsz,),
-        generator=timesteps_gen,
+        generator=generator,
         device=latents.device,
     )
     timesteps = timesteps.long()
@@ -176,7 +184,7 @@ def loss_step(
     else:
         raise ValueError(f"Unknown prediction type {noise_scheduler.config.prediction_type}")
 
-    if with_prior:
+    if batch["with_prior"]:
         # Chunk the noise and model_pred into two parts and compute the loss on each part separately.
         model_pred, model_pred_prior = torch.chunk(model_pred, 2, dim=0)
         target, target_prior = torch.chunk(target, 2, dim=0)
@@ -207,7 +215,6 @@ def train_loop(
     val_dataloader: DataLoader,
     loss_step: Union[Callable[[int, Any], Tuple[Any, Any, int]], Callable[[int, Any, bool], Tuple[Any, Any, int]]],
     sample_frequency: int = 10,
-    sample_steps: int = 20,
     checkpoint_frequency: int = 50,
     global_step_offset: int = 0,
     num_epochs: int = 100,
@@ -251,7 +258,7 @@ def train_loop(
         for epoch in range(num_epochs):
             if accelerator.is_main_process:
                 if epoch % sample_frequency == 0:
-                    checkpointer.save_samples(global_step + global_step_offset, sample_steps)
+                    checkpointer.save_samples(global_step + global_step_offset)
 
                 if epoch % checkpoint_frequency == 0 and epoch != 0:
                     checkpointer.checkpoint(global_step + global_step_offset, "training")
@@ -353,7 +360,7 @@ def train_loop(
         if accelerator.is_main_process:
             print("Finished!")
             checkpointer.checkpoint(global_step + global_step_offset, "end")
-            checkpointer.save_samples(global_step + global_step_offset, sample_steps)
+            checkpointer.save_samples(global_step + global_step_offset)
             accelerator.end_training()
 
     except KeyboardInterrupt:
diff --git a/training/util.py b/training/util.py
index cc4cdee..1008021 100644
--- a/training/util.py
+++ b/training/util.py
@@ -44,32 +44,29 @@ class CheckpointerBase:
         train_dataloader,
         val_dataloader,
         output_dir: Path,
-        sample_image_size: int,
-        sample_batches: int,
-        sample_batch_size: int,
+        sample_steps: int = 20,
+        sample_guidance_scale: float = 7.5,
+        sample_image_size: int = 768,
+        sample_batches: int = 1,
+        sample_batch_size: int = 1,
         seed: Optional[int] = None
     ):
         self.train_dataloader = train_dataloader
         self.val_dataloader = val_dataloader
         self.output_dir = output_dir
         self.sample_image_size = sample_image_size
-        self.seed = seed if seed is not None else torch.random.seed()
+        self.sample_steps = sample_steps
+        self.sample_guidance_scale = sample_guidance_scale
         self.sample_batches = sample_batches
         self.sample_batch_size = sample_batch_size
+        self.seed = seed if seed is not None else torch.random.seed()
 
     @torch.no_grad()
     def checkpoint(self, step: int, postfix: str):
         pass
 
     @torch.inference_mode()
-    def save_samples(
-        self,
-        pipeline,
-        step: int,
-        num_inference_steps: int,
-        guidance_scale: float = 7.5,
-        eta: float = 0.0
-    ):
+    def save_samples(self, pipeline, step: int):
         samples_path = Path(self.output_dir).joinpath("samples")
 
         generator = torch.Generator(device=pipeline.device).manual_seed(self.seed)
@@ -110,9 +107,8 @@ class CheckpointerBase:
                     height=self.sample_image_size,
                     width=self.sample_image_size,
                     generator=gen,
-                    guidance_scale=guidance_scale,
-                    eta=eta,
-                    num_inference_steps=num_inference_steps,
+                    guidance_scale=self.sample_guidance_scale,
+                    num_inference_steps=self.sample_steps,
                     output_type='pil'
                 ).images