Removed int8 to float32 conversion (* 2.0 - 1.0) from train_transforms as it caused image overexposure.

Added `_resize_for_rectangle_crop` function to enable video cropping functionality. The cropping mode can be configured via `video_reshape_mode`, supporting options: ['center', 'random', 'none'].

Author: --unset

examples/cogvideo/README.md

@@ -180,6 +180,7 @@ Note that setting the `<ID_TOKEN>` is not necessary. From some limited experimen
 
 > [!TIP]
 > You can pass `--use_8bit_adam` to reduce the memory requirements of training.
+> You can pass `--video_reshape_mode` video cropping functionality, supporting options: ['center', 'random', 'none'].
 
 > [!IMPORTANT]
 > The following settings have been tested at the time of adding CogVideoX LoRA training support:

examples/cogvideo/train_cogvideox_lora.py

@@ -42,6 +42,10 @@
 from diffusers.utils import check_min_version, convert_unet_state_dict_to_peft, export_to_video, is_wandb_available
 from diffusers.utils.hub_utils import load_or_create_model_card, populate_model_card
 from diffusers.utils.torch_utils import is_compiled_module
+from torchvision.transforms.functional import center_crop, resize
+from torchvision.transforms import InterpolationMode
+import torchvision.transforms as TT
+import numpy as np
 
 
 if is_wandb_available():
@@ -214,6 +218,12 @@ def get_args():
         default=720,
         help="All input videos are resized to this width.",
     )
+    parser.add_argument(
+        "--video_reshape_mode",
+        type=str,
+        default="center",
+        help="All input videos are reshaped to this mode. Choose between ['center', 'random', 'none']",
+    )
     parser.add_argument("--fps", type=int, default=8, help="All input videos will be used at this FPS.")
     parser.add_argument(
         "--max_num_frames", type=int, default=49, help="All input videos will be truncated to these many frames."
@@ -413,6 +423,7 @@ def __init__(
         video_column: str = "video",
         height: int = 480,
         width: int = 720,
+        video_reshape_mode: str = "center",
         fps: int = 8,
         max_num_frames: int = 49,
         skip_frames_start: int = 0,
@@ -429,6 +440,7 @@ def __init__(
         self.video_column = video_column
         self.height = height
         self.width = width
+        self.video_reshape_mode = video_reshape_mode
         self.fps = fps
         self.max_num_frames = max_num_frames
         self.skip_frames_start = skip_frames_start
@@ -532,6 +544,38 @@ def _load_dataset_from_local_path(self):
 
         return instance_prompts, instance_videos
 
+    def _resize_for_rectangle_crop(self, arr):
+        image_size = self.height, self.width
+        reshape_mode = self.video_reshape_mode
+        if arr.shape[3] / arr.shape[2] > image_size[1] / image_size[0]:
+            arr = resize(
+                arr,
+                size=[image_size[0], int(arr.shape[3] * image_size[0] / arr.shape[2])],
+                interpolation=InterpolationMode.BICUBIC,
+            )
+        else:
+            arr = resize(
+                arr,
+                size=[int(arr.shape[2] * image_size[1] / arr.shape[3]), image_size[1]],
+                interpolation=InterpolationMode.BICUBIC,
+            )
+
+        h, w = arr.shape[2], arr.shape[3]
+        arr = arr.squeeze(0)
+
+        delta_h = h - image_size[0]
+        delta_w = w - image_size[1]
+
+        if reshape_mode == "random" or reshape_mode == "none":
+            top = np.random.randint(0, delta_h + 1)
+            left = np.random.randint(0, delta_w + 1)
+        elif reshape_mode == "center":
+            top, left = delta_h // 2, delta_w // 2
+        else:
+            raise NotImplementedError
+        arr = TT.functional.crop(arr, top=top, left=left, height=image_size[0], width=image_size[1])
+        return arr
+
     def _preprocess_data(self):
         try:
             import decord
@@ -542,14 +586,14 @@ def _preprocess_data(self):
 
         decord.bridge.set_bridge("torch")
 
-        videos = []
-        train_transforms = transforms.Compose(
-            [
-                transforms.Lambda(lambda x: x / 255.0 * 2.0 - 1.0),
-            ]
+        progress_dataset_bar = tqdm(
+            range(0, len(self.instance_video_paths)),
+            desc="Loading progress resize and crop videos",
         )
+        videos = []
 
         for filename in self.instance_video_paths:
+            progress_dataset_bar.update(1)
             video_reader = decord.VideoReader(uri=filename.as_posix(), width=self.width, height=self.height)
             video_num_frames = len(video_reader)
 
@@ -576,10 +620,12 @@ def _preprocess_data(self):
             assert (selected_num_frames - 1) % 4 == 0
 
             # Training transforms
-            frames = frames.float()
-            frames = torch.stack([train_transforms(frame) for frame in frames], dim=0)
-            videos.append(frames.permute(0, 3, 1, 2).contiguous())  # [F, C, H, W]
+            tensor = frames.float() / 255.0
+            frames = tensor.permute(0, 3, 1, 2)
+            frames = self._resize_for_rectangle_crop(frames)
+            videos.append(frames.contiguous())  # [F, C, H, W]
 
+        progress_dataset_bar.close()
         return videos
 
 
@@ -1171,6 +1217,7 @@ def load_model_hook(models, input_dir):
         video_column=args.video_column,
         height=args.height,
         width=args.width,
+        video_reshape_mode=args.video_reshape_mode,
         fps=args.fps,
         max_num_frames=args.max_num_frames,
         skip_frames_start=args.skip_frames_start,
@@ -1179,13 +1226,20 @@ def load_model_hook(models, input_dir):
         id_token=args.id_token,
     )
 
-    def encode_video(video):
+
+    def encode_video(video, bar):
+        bar.update(1)
         video = video.to(accelerator.device, dtype=vae.dtype).unsqueeze(0)
         video = video.permute(0, 2, 1, 3, 4)  # [B, C, F, H, W]
         latent_dist = vae.encode(video).latent_dist
         return latent_dist
 
-    train_dataset.instance_videos = [encode_video(video) for video in train_dataset.instance_videos]
+    progress_encode_bar = tqdm(
+        range(0, len(train_dataset.instance_videos)),
+        desc="Loading Encode videos",
+    )
+    train_dataset.instance_videos = [encode_video(video,progress_encode_bar) for video in train_dataset.instance_videos]
+    progress_encode_bar.close()
 
     def collate_fn(examples):
         videos = [example["instance_video"].sample() * vae.config.scaling_factor for example in examples]