ExVideo for AnimateDiff

ExVideo_animatediff_train.py

@@ -0,0 +1,267 @@
+import torch, json, os, imageio
+from torchvision.transforms import v2
+from einops import rearrange
+import lightning as pl
+from diffsynth import ModelManager, EnhancedDDIMScheduler, SDVideoPipeline, SDUNet, load_state_dict, SDMotionModel
+
+
+
+def lets_dance(
+    unet: SDUNet,
+    motion_modules: SDMotionModel,
+    sample,
+    timestep,
+    encoder_hidden_states,
+    use_gradient_checkpointing=False,
+):
+    # 1. ControlNet (skip)
+    # 2. time
+    time_emb = unet.time_proj(timestep[None]).to(sample.dtype)
+    time_emb = unet.time_embedding(time_emb)
+
+    # 3. pre-process
+    hidden_states = unet.conv_in(sample)
+    text_emb = encoder_hidden_states
+    res_stack = [hidden_states]
+
+    # 4. blocks
+    def create_custom_forward(module):
+        def custom_forward(*inputs):
+            return module(*inputs)
+        return custom_forward
+    for block_id, block in enumerate(unet.blocks):
+        # 4.1 UNet
+        if use_gradient_checkpointing:
+            hidden_states, time_emb, text_emb, res_stack = torch.utils.checkpoint.checkpoint(
+                create_custom_forward(block),
+                hidden_states, time_emb, text_emb, res_stack,
+                use_reentrant=False,
+            )
+        else:
+            hidden_states, time_emb, text_emb, res_stack = block(hidden_states, time_emb, text_emb, res_stack)
+        # 4.2 AnimateDiff
+        if block_id in motion_modules.call_block_id:
+            motion_module_id = motion_modules.call_block_id[block_id]
+            if use_gradient_checkpointing:
+                hidden_states, time_emb, text_emb, res_stack = torch.utils.checkpoint.checkpoint(
+                    create_custom_forward(motion_modules.motion_modules[motion_module_id]),
+                    hidden_states, time_emb, text_emb, res_stack,
+                    use_reentrant=False,
+                )
+            else:
+                hidden_states, time_emb, text_emb, res_stack = motion_modules.motion_modules[motion_module_id](hidden_states, time_emb, text_emb, res_stack)
+    
+    # 5. output
+    hidden_states = unet.conv_norm_out(hidden_states)
+    hidden_states = unet.conv_act(hidden_states)
+    hidden_states = unet.conv_out(hidden_states)
+
+    return hidden_states
+
+
+
+class TextVideoDataset(torch.utils.data.Dataset):
+    def __init__(self, base_path, metadata_path, steps_per_epoch=10000, training_shapes=[(128, 1, 128, 512, 512)]):
+        with open(metadata_path, "r") as f:
+            metadata = json.load(f)
+        self.path = [os.path.join(base_path, i["path"]) for i in metadata]
+        self.text = [i["text"] for i in metadata]
+        self.steps_per_epoch = steps_per_epoch
+        self.training_shapes = training_shapes
+
+        self.frame_process = []
+        for max_num_frames, interval, num_frames, height, width in training_shapes:
+            self.frame_process.append(v2.Compose([
+                v2.Resize(size=max(height, width), antialias=True),
+                v2.CenterCrop(size=(height, width)),
+                v2.Normalize(mean=[127.5, 127.5, 127.5], std=[127.5, 127.5, 127.5]),
+            ]))
+
+
+    def load_frames_using_imageio(self, file_path, max_num_frames, start_frame_id, interval, num_frames, frame_process):
+        reader = imageio.get_reader(file_path)
+        if reader.count_frames() < max_num_frames or reader.count_frames() - 1 < start_frame_id + (num_frames - 1) * interval:
+            reader.close()
+            return None
+        
+        frames = []
+        for frame_id in range(num_frames):
+            frame = reader.get_data(start_frame_id + frame_id * interval)
+            frame = torch.tensor(frame, dtype=torch.float32)
+            frame = rearrange(frame, "H W C -> 1 C H W")
+            frame = frame_process(frame)
+            frames.append(frame)
+        reader.close()
+
+        frames = torch.concat(frames, dim=0)
+        frames = rearrange(frames, "T C H W -> C T H W")
+
+        return frames
+
+
+    def load_video(self, file_path, training_shape_id):
+        data = {}
+        max_num_frames, interval, num_frames, height, width = self.training_shapes[training_shape_id]
+        frame_process = self.frame_process[training_shape_id]
+        start_frame_id = torch.randint(0, max_num_frames - (num_frames - 1) * interval, (1,))[0]
+        frames = self.load_frames_using_imageio(file_path, max_num_frames, start_frame_id, interval, num_frames, frame_process)
+        if frames is None:
+            return None
+        else:
+            data[f"frames_{training_shape_id}"] = frames
+            data[f"start_frame_id_{training_shape_id}"] = start_frame_id
+        return data
+
+
+    def __getitem__(self, index):
+        video_data = {}
+        for training_shape_id in range(len(self.training_shapes)):
+            while True:
+                data_id = torch.randint(0, len(self.path), (1,))[0]
+                data_id = (data_id + index) % len(self.path) # For fixed seed.
+                text = self.text[data_id]
+                if isinstance(text, list):
+                    text = text[torch.randint(0, len(text), (1,))[0]]
+                video_file = self.path[data_id]
+                try:
+                    data = self.load_video(video_file, training_shape_id)
+                except:
+                    data = None
+                if data is not None:
+                    data[f"text_{training_shape_id}"] = text
+                    break
+            video_data.update(data)
+        return video_data
+    
+
+    def __len__(self):
+        return self.steps_per_epoch
+
+
+
+class LightningModel(pl.LightningModule):
+    def __init__(self, learning_rate=1e-5, sd_ckpt_path=None):
+        super().__init__()
+        # Load models
+        model_manager = ModelManager(torch_dtype=torch.float16, device="cpu")
+        model_manager.load_stable_diffusion(load_state_dict(sd_ckpt_path))
+        
+        # Initialize motion modules
+        model_manager.model["motion_modules"] = SDMotionModel().to(dtype=self.dtype, device=self.device)
+
+        # Build pipeline
+        self.pipe = SDVideoPipeline.from_model_manager(model_manager)
+        self.pipe.vae_encoder.eval()
+        self.pipe.vae_encoder.requires_grad_(False)
+
+        self.pipe.vae_decoder.eval()
+        self.pipe.vae_decoder.requires_grad_(False)
+
+        self.pipe.text_encoder.eval()
+        self.pipe.text_encoder.requires_grad_(False)
+
+        self.pipe.unet.eval()
+        self.pipe.unet.requires_grad_(False)
+
+        self.pipe.motion_modules.train()
+        self.pipe.motion_modules.requires_grad_(True)
+
+        # Reset the scheduler
+        self.pipe.scheduler = EnhancedDDIMScheduler(beta_schedule="scaled_linear")
+        self.pipe.scheduler.set_timesteps(1000)
+
+        # Other parameters
+        self.learning_rate = learning_rate
+
+
+    def encode_video_with_vae(self, video):
+        video = video.to(device=self.device, dtype=self.dtype)
+        video = video.unsqueeze(0)
+        latents = self.pipe.vae_encoder.encode_video(video, batch_size=16)
+        latents = rearrange(latents[0], "C T H W -> T C H W")
+        return latents
+        
+
+    def calculate_loss(self, prompt, frames):
+        with torch.no_grad():
+            # Call video encoder
+            latents = self.encode_video_with_vae(frames)
+
+            # Call text encoder
+            prompt_embs = self.pipe.prompter.encode_prompt(self.pipe.text_encoder, prompt, device=self.device, max_length=77)
+            prompt_embs = prompt_embs.repeat(latents.shape[0], 1, 1)
+
+            # Call scheduler
+            timestep = torch.randint(0, len(self.pipe.scheduler.timesteps), (1,), device=self.device)[0]
+            noise = torch.randn_like(latents)
+            noisy_latents = self.pipe.scheduler.add_noise(latents, noise, timestep)
+
+        # Calculate loss
+        model_pred = lets_dance(
+            self.pipe.unet, self.pipe.motion_modules,
+            sample=noisy_latents, encoder_hidden_states=prompt_embs, timestep=timestep
+        )
+        loss = torch.nn.functional.mse_loss(model_pred.float(), noise.float(), reduction="mean")
+        return loss
+    
+
+    def training_step(self, batch, batch_idx):
+        # Loss
+        frames = batch["frames_0"][0]
+        prompt = batch["text_0"][0]
+        loss = self.calculate_loss(prompt, frames)
+
+        # Record log
+        self.log("train_loss", loss, prog_bar=True)
+        return loss
+
+
+    def configure_optimizers(self):
+        optimizer = torch.optim.AdamW(self.pipe.motion_modules.parameters(), lr=self.learning_rate)
+        return optimizer
+    
+
+    def on_save_checkpoint(self, checkpoint):
+        trainable_param_names = list(filter(lambda named_param: named_param[1].requires_grad, self.pipe.motion_modules.named_parameters()))
+        trainable_param_names = [named_param[0] for named_param in trainable_param_names]
+        checkpoint["trainable_param_names"] = trainable_param_names
+
+
+
+if __name__ == '__main__':
+    # dataset and data loader
+    dataset = TextVideoDataset(
+        "/data/zhongjie/datasets/opensoraplan/data/processed",
+        "/data/zhongjie/datasets/opensoraplan/data/processed/metadata.json",
+        training_shapes=[(16, 1, 16, 512, 512)],
+        steps_per_epoch=7*10000,
+    )
+    train_loader = torch.utils.data.DataLoader(
+        dataset,
+        shuffle=True,
+        batch_size=1,
+        num_workers=4
+    )
+
+    # model
+    model = LightningModel(
+        learning_rate=1e-5,
+        sd_ckpt_path="models/stable_diffusion/v1-5-pruned-emaonly.safetensors",
+    )
+
+    # train
+    trainer = pl.Trainer(
+        max_epochs=100000,
+        accelerator="gpu",
+        devices="auto",
+        strategy="deepspeed_stage_1",
+        precision="16-mixed",
+        default_root_dir="/data/zhongjie/models/train_extended_animatediff",
+        accumulate_grad_batches=1,
+        callbacks=[pl.pytorch.callbacks.ModelCheckpoint(save_top_k=-1)]
+    )
+    trainer.fit(
+        model=model,
+        train_dataloaders=train_loader,
+        ckpt_path=None
+    )

diffsynth/models/__init__.py

@@ -194,10 +194,10 @@ class ModelManager:
         self.model[component].append(model)
         self.model_path[component].append(file_path)
 
-    def load_animatediff(self, state_dict, file_path=""):
+    def load_animatediff(self, state_dict, file_path="", add_positional_conv=None):
         component = "motion_modules"
-        model = SDMotionModel()
-        model.load_state_dict(model.state_dict_converter().from_civitai(state_dict))
+        model = SDMotionModel(add_positional_conv=add_positional_conv)
+        model.load_state_dict(model.state_dict_converter().from_civitai(state_dict, add_positional_conv=add_positional_conv))
         model.to(self.torch_dtype).to(self.device)
         self.model[component] = model
         self.model_path[component] = file_path

diffsynth/models/sd_motion.py

@@ -1,20 +1,28 @@
 from .sd_unet import SDUNet, Attention, GEGLU
+from .svd_unet import get_timestep_embedding
 import torch
 from einops import rearrange, repeat
 
 
 class TemporalTransformerBlock(torch.nn.Module):
 
-    def __init__(self, dim, num_attention_heads, attention_head_dim, max_position_embeddings=32):
+    def __init__(self, dim, num_attention_heads, attention_head_dim, max_position_embeddings=32, add_positional_conv=None):
         super().__init__()
+        self.add_positional_conv = add_positional_conv
 
         # 1. Self-Attn
-        self.pe1 = torch.nn.Parameter(torch.zeros(1, max_position_embeddings, dim))
+        emb = get_timestep_embedding(torch.arange(max_position_embeddings), dim, True, 0).reshape(1, max_position_embeddings, dim)
+        self.pe1 = torch.nn.Parameter(emb)
+        if add_positional_conv:
+            self.positional_conv_1 = torch.nn.Conv1d(dim, dim, kernel_size=3, padding=1, padding_mode="reflect")
         self.norm1 = torch.nn.LayerNorm(dim, elementwise_affine=True)
         self.attn1 = Attention(q_dim=dim, num_heads=num_attention_heads, head_dim=attention_head_dim, bias_out=True)
 
         # 2. Cross-Attn
-        self.pe2 = torch.nn.Parameter(torch.zeros(1, max_position_embeddings, dim))
+        emb = get_timestep_embedding(torch.arange(max_position_embeddings), dim, True, 0).reshape(1, max_position_embeddings, dim)
+        self.pe2 = torch.nn.Parameter(emb)
+        if add_positional_conv:
+            self.positional_conv_2 = torch.nn.Conv1d(dim, dim, kernel_size=3, padding=1, padding_mode="reflect")
         self.norm2 = torch.nn.LayerNorm(dim, elementwise_affine=True)
         self.attn2 = Attention(q_dim=dim, num_heads=num_attention_heads, head_dim=attention_head_dim, bias_out=True)
 
@@ -24,19 +32,47 @@ class TemporalTransformerBlock(torch.nn.Module):
         self.ff = torch.nn.Linear(dim * 4, dim)
 
 
+    def frame_id_to_position_id(self, frame_id, max_id, repeat_length):
+        if frame_id < max_id:
+            position_id = frame_id
+        else:
+            position_id = (frame_id - max_id) % (repeat_length * 2)
+            if position_id < repeat_length:
+                position_id = max_id - 2 - position_id
+            else:
+                position_id = max_id - 2 * repeat_length + position_id
+        return position_id
+    
+
+    def positional_ids(self, num_frames):
+        max_id = self.pe1.shape[1]
+        positional_ids = torch.IntTensor([self.frame_id_to_position_id(i, max_id, max_id - 1) for i in range(num_frames)])
+        return positional_ids
+
+
     def forward(self, hidden_states, batch_size=1):
 
         # 1. Self-Attention
         norm_hidden_states = self.norm1(hidden_states)
         norm_hidden_states = rearrange(norm_hidden_states, "(b f) h c -> (b h) f c", b=batch_size)
-        attn_output = self.attn1(norm_hidden_states + self.pe1[:, :norm_hidden_states.shape[1]])
+        norm_hidden_states = norm_hidden_states + self.pe1[:, self.positional_ids(norm_hidden_states.shape[1])]
+        if self.add_positional_conv:
+            norm_hidden_states = rearrange(norm_hidden_states, "(b h) f c -> (b h) c f", b=batch_size)
+            norm_hidden_states = self.positional_conv_1(norm_hidden_states)
+            norm_hidden_states = rearrange(norm_hidden_states, "(b h) c f -> (b h) f c", b=batch_size)
+        attn_output = self.attn1(norm_hidden_states)
         attn_output = rearrange(attn_output, "(b h) f c -> (b f) h c", b=batch_size)
         hidden_states = attn_output + hidden_states
 
         # 2. Cross-Attention
         norm_hidden_states = self.norm2(hidden_states)
         norm_hidden_states = rearrange(norm_hidden_states, "(b f) h c -> (b h) f c", b=batch_size)
-        attn_output = self.attn2(norm_hidden_states + self.pe2[:, :norm_hidden_states.shape[1]])
+        norm_hidden_states = norm_hidden_states + self.pe2[:, self.positional_ids(norm_hidden_states.shape[1])]
+        if self.add_positional_conv:
+            norm_hidden_states = rearrange(norm_hidden_states, "(b h) f c -> (b h) c f", b=batch_size)
+            norm_hidden_states = self.positional_conv_2(norm_hidden_states)
+            norm_hidden_states = rearrange(norm_hidden_states, "(b h) c f -> (b h) f c", b=batch_size)
+        attn_output = self.attn2(norm_hidden_states)
         attn_output = rearrange(attn_output, "(b h) f c -> (b f) h c", b=batch_size)
         hidden_states = attn_output + hidden_states
 
@@ -51,7 +87,7 @@ class TemporalTransformerBlock(torch.nn.Module):
 
 class TemporalBlock(torch.nn.Module):
     
-    def __init__(self, num_attention_heads, attention_head_dim, in_channels, num_layers=1, norm_num_groups=32, eps=1e-5):
+    def __init__(self, num_attention_heads, attention_head_dim, in_channels, num_layers=1, norm_num_groups=32, eps=1e-5, add_positional_conv=None):
         super().__init__()
         inner_dim = num_attention_heads * attention_head_dim
 
@@ -62,7 +98,9 @@ class TemporalBlock(torch.nn.Module):
             TemporalTransformerBlock(
                 inner_dim,
                 num_attention_heads,
-                attention_head_dim
+                attention_head_dim,
+                max_position_embeddings=32 if add_positional_conv is None else add_positional_conv,
+                add_positional_conv=add_positional_conv
             )
             for d in range(num_layers)
         ])
@@ -92,30 +130,30 @@ class TemporalBlock(torch.nn.Module):
 
 
 class SDMotionModel(torch.nn.Module):
-    def __init__(self):
+    def __init__(self, add_positional_conv=None):
         super().__init__()
         self.motion_modules = torch.nn.ModuleList([
-            TemporalBlock(8, 40, 320, eps=1e-6),
-            TemporalBlock(8, 40, 320, eps=1e-6),
-            TemporalBlock(8, 80, 640, eps=1e-6),
-            TemporalBlock(8, 80, 640, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 160, 1280, eps=1e-6),
-            TemporalBlock(8, 80, 640, eps=1e-6),
-            TemporalBlock(8, 80, 640, eps=1e-6),
-            TemporalBlock(8, 80, 640, eps=1e-6),
-            TemporalBlock(8, 40, 320, eps=1e-6),
-            TemporalBlock(8, 40, 320, eps=1e-6),
-            TemporalBlock(8, 40, 320, eps=1e-6),
+            TemporalBlock(8, 40, 320, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 40, 320, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 80, 640, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 80, 640, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 160, 1280, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 80, 640, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 80, 640, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 80, 640, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 40, 320, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 40, 320, eps=1e-6, add_positional_conv=add_positional_conv),
+            TemporalBlock(8, 40, 320, eps=1e-6, add_positional_conv=add_positional_conv),
         ])
         self.call_block_id = {
             1: 0,
@@ -152,7 +190,42 @@ class SDMotionModelStateDictConverter:
     def __init__(self):
         pass
 
-    def from_diffusers(self, state_dict):
+    def frame_id_to_position_id(self, frame_id, max_id, repeat_length):
+        if frame_id < max_id:
+            position_id = frame_id
+        else:
+            position_id = (frame_id - max_id) % (repeat_length * 2)
+            if position_id < repeat_length:
+                position_id = max_id - 2 - position_id
+            else:
+                position_id = max_id - 2 * repeat_length + position_id
+        return position_id
+
+    def process_positional_conv_parameters(self, state_dict, add_positional_conv):
+        ids = [self.frame_id_to_position_id(i, 16, 15) for i in range(add_positional_conv)]
+        for i in range(21):
+            # Extend positional embedding
+            name = f"motion_modules.{i}.transformer_blocks.0.pe1"
+            state_dict[name] = state_dict[name][:, ids]
+            name = f"motion_modules.{i}.transformer_blocks.0.pe2"
+            state_dict[name] = state_dict[name][:, ids]
+            # add post convolution
+            dim = state_dict[f"motion_modules.{i}.transformer_blocks.0.pe1"].shape[-1]
+            name = f"motion_modules.{i}.transformer_blocks.0.positional_conv_1.bias"
+            state_dict[name] = torch.zeros((dim,))
+            name = f"motion_modules.{i}.transformer_blocks.0.positional_conv_2.bias"
+            state_dict[name] = torch.zeros((dim,))
+            name = f"motion_modules.{i}.transformer_blocks.0.positional_conv_1.weight"
+            param = torch.zeros((dim, dim, 3))
+            param[:, :, 1] = torch.eye(dim, dim)
+            state_dict[name] = param
+            name = f"motion_modules.{i}.transformer_blocks.0.positional_conv_2.weight"
+            param = torch.zeros((dim, dim, 3))
+            param[:, :, 1] = torch.eye(dim, dim)
+            state_dict[name] = param
+        return state_dict
+
+    def from_diffusers(self, state_dict, add_positional_conv=None):
         rename_dict = {
             "norm": "norm",
             "proj_in": "proj_in",
@@ -192,7 +265,9 @@ class SDMotionModelStateDictConverter:
             else:
                 rename = ".".join(["motion_modules", str(module_id), rename_dict[middle_name], suffix])
             state_dict_[rename] = state_dict[name]
+        if add_positional_conv is not None:
+            state_dict_ = self.process_positional_conv_parameters(state_dict_, add_positional_conv)
         return state_dict_
     
-    def from_civitai(self, state_dict):
-        return self.from_diffusers(state_dict)
+    def from_civitai(self, state_dict, add_positional_conv=None):
+        return self.from_diffusers(state_dict, add_positional_conv=add_positional_conv)

diffsynth/models/sd_motion_ex.py

@@ -0,0 +1,115 @@
+from .attention import Attention
+from .svd_unet import get_timestep_embedding
+import torch
+from einops import rearrange, repeat
+
+
+
+class ExVideoMotionBlock(torch.nn.Module):
+
+    def __init__(self, num_attention_heads, attention_head_dim, in_channels, max_position_embeddings=16, num_layers=1, add_positional_conv=None):
+        super().__init__()
+
+        emb = get_timestep_embedding(torch.arange(max_position_embeddings), in_channels, True, 0).reshape(max_position_embeddings, in_channels, 1, 1)
+        self.positional_embedding = torch.nn.Parameter(emb)
+        self.positional_conv = torch.nn.Conv3d(in_channels, in_channels, kernel_size=3, padding=1) if add_positional_conv is not None else None
+        self.norms = torch.nn.ModuleList([torch.nn.LayerNorm(in_channels) for _ in range(num_layers)])
+        self.attns = torch.nn.ModuleList([Attention(q_dim=in_channels, num_heads=num_attention_heads, head_dim=attention_head_dim, bias_out=True) for _ in range(num_layers)])
+
+    def frame_id_to_position_id(self, frame_id, max_id, repeat_length):
+        if frame_id < max_id:
+            position_id = frame_id
+        else:
+            position_id = (frame_id - max_id) % (repeat_length * 2)
+            if position_id < repeat_length:
+                position_id = max_id - 2 - position_id
+            else:
+                position_id = max_id - 2 * repeat_length + position_id
+        return position_id
+    
+    def positional_ids(self, num_frames):
+        max_id = self.positional_embedding.shape[0]
+        positional_ids = torch.IntTensor([self.frame_id_to_position_id(i, max_id, max_id - 1) for i in range(num_frames)])
+        return positional_ids
+
+    def forward(self, hidden_states, time_emb, text_emb, res_stack, batch_size=1, **kwargs):
+        batch, inner_dim, height, width = hidden_states.shape
+        residual = hidden_states
+
+        pos_emb = self.positional_ids(batch // batch_size)
+        pos_emb = self.positional_embedding[pos_emb]
+        pos_emb = pos_emb.repeat(batch_size)
+        hidden_states = hidden_states + pos_emb
+        if self.positional_conv is not None:
+            hidden_states = rearrange(hidden_states, "(B T) C H W -> B C T H W", B=batch_size)
+            hidden_states = self.positional_conv(hidden_states)
+            hidden_states = rearrange(hidden_states, "B C T H W -> (B H W) T C")
+        else:
+            hidden_states = rearrange(hidden_states, "(B T) C H W -> (B H W) T C", B=batch_size)
+
+        for norm, attn in zip(self.norms, self.attns):
+            norm_hidden_states = norm(hidden_states)
+            attn_output = attn(norm_hidden_states)
+            hidden_states = hidden_states + attn_output
+
+        hidden_states = rearrange(hidden_states, "(B H W) T C -> (B T) C H W", B=batch_size, H=height, W=width)
+        hidden_states = hidden_states + residual
+        return hidden_states, time_emb, text_emb, res_stack
+
+
+
+class ExVideoMotionModel(torch.nn.Module):
+    def __init__(self, num_layers=2):
+        super().__init__()
+        self.motion_modules = torch.nn.ModuleList([
+            ExVideoMotionBlock(8, 40, 320, num_layers=num_layers),
+            ExVideoMotionBlock(8, 40, 320, num_layers=num_layers),
+            ExVideoMotionBlock(8, 80, 640, num_layers=num_layers),
+            ExVideoMotionBlock(8, 80, 640, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 160, 1280, num_layers=num_layers),
+            ExVideoMotionBlock(8, 80, 640, num_layers=num_layers),
+            ExVideoMotionBlock(8, 80, 640, num_layers=num_layers),
+            ExVideoMotionBlock(8, 80, 640, num_layers=num_layers),
+            ExVideoMotionBlock(8, 40, 320, num_layers=num_layers),
+            ExVideoMotionBlock(8, 40, 320, num_layers=num_layers),
+            ExVideoMotionBlock(8, 40, 320, num_layers=num_layers),
+        ])
+        self.call_block_id = {
+            1: 0,
+            4: 1,
+            9: 2,
+            12: 3,
+            17: 4,
+            20: 5,
+            24: 6,
+            26: 7,
+            29: 8,
+            32: 9,
+            34: 10,
+            36: 11,
+            40: 12,
+            43: 13,
+            46: 14,
+            50: 15,
+            53: 16,
+            56: 17,
+            60: 18,
+            63: 19,
+            66: 20
+        }
+        
+    def forward(self):
+        pass
+
+    def state_dict_converter(self):
+        pass

diffsynth/pipelines/stable_diffusion_video.py

@@ -10,6 +10,7 @@ import torch, os, json
 from tqdm import tqdm
 from PIL import Image
 import numpy as np
+from einops import rearrange
 
 
 def lets_dance_with_long_video(
@@ -150,6 +151,14 @@ class SDVideoPipeline(torch.nn.Module):
         return latents
     
 
+    def post_process_latents(self, latents, post_normalize=True, contrast_enhance_scale=1.0):
+        if post_normalize:
+            mean, std = latents.mean(), latents.std()
+            latents = (latents - latents.mean(dim=[1, 2, 3], keepdim=True)) / latents.std(dim=[1, 2, 3], keepdim=True) * std + mean
+        latents = latents * contrast_enhance_scale
+        return latents
+    
+
     @torch.no_grad()
     def __call__(
         self,
@@ -172,6 +181,8 @@ class SDVideoPipeline(torch.nn.Module):
         smoother=None,
         smoother_progress_ids=[],
         vram_limit_level=0,
+        post_normalize=False,
+        contrast_enhance_scale=1.0,
         progress_bar_cmd=tqdm,
         progress_bar_st=None,
     ):
@@ -226,15 +237,18 @@ class SDVideoPipeline(torch.nn.Module):
                 cross_frame_attention=cross_frame_attention,
                 device=self.device, vram_limit_level=vram_limit_level
             )
-            noise_pred_nega = lets_dance_with_long_video(
-                self.unet, motion_modules=self.motion_modules, controlnet=self.controlnet,
-                sample=latents, timestep=timestep, encoder_hidden_states=prompt_emb_nega, controlnet_frames=controlnet_frames,
-                animatediff_batch_size=animatediff_batch_size, animatediff_stride=animatediff_stride,
-                unet_batch_size=unet_batch_size, controlnet_batch_size=controlnet_batch_size,
-                cross_frame_attention=cross_frame_attention,
-                device=self.device, vram_limit_level=vram_limit_level
-            )
-            noise_pred = noise_pred_nega + cfg_scale * (noise_pred_posi - noise_pred_nega)
+            if cfg_scale != 1.0:
+                noise_pred_nega = lets_dance_with_long_video(
+                    self.unet, motion_modules=self.motion_modules, controlnet=self.controlnet,
+                    sample=latents, timestep=timestep, encoder_hidden_states=prompt_emb_nega, controlnet_frames=controlnet_frames,
+                    animatediff_batch_size=animatediff_batch_size, animatediff_stride=animatediff_stride,
+                    unet_batch_size=unet_batch_size, controlnet_batch_size=controlnet_batch_size,
+                    cross_frame_attention=cross_frame_attention,
+                    device=self.device, vram_limit_level=vram_limit_level
+                )
+                noise_pred = noise_pred_nega + cfg_scale * (noise_pred_posi - noise_pred_nega)
+            else:
+                noise_pred = noise_pred_posi
 
             # DDIM and smoother
             if smoother is not None and progress_id in smoother_progress_ids:
@@ -250,6 +264,7 @@ class SDVideoPipeline(torch.nn.Module):
                 progress_bar_st.progress(progress_id / len(self.scheduler.timesteps))
         
         # Decode image
+        latents = self.post_process_latents(latents, post_normalize=post_normalize, contrast_enhance_scale=contrast_enhance_scale)
         output_frames = self.decode_images(latents)
 
         # Post-process

diffsynth/prompts/sd_prompter.py

@@ -8,9 +8,9 @@ class SDPrompter(Prompter):
         super().__init__()
         self.tokenizer = CLIPTokenizer.from_pretrained(tokenizer_path)
 
-    def encode_prompt(self, text_encoder: SDTextEncoder, prompt, clip_skip=1, device="cuda", positive=True):
+    def encode_prompt(self, text_encoder: SDTextEncoder, prompt, clip_skip=1, device="cuda", positive=True, max_length=99999999):
         prompt = self.process_prompt(prompt, positive=positive)
-        input_ids = tokenize_long_prompt(self.tokenizer, prompt).to(device)
+        input_ids = tokenize_long_prompt(self.tokenizer, prompt, max_length=max_length).to(device)
         prompt_emb = text_encoder(input_ids, clip_skip=clip_skip)
         prompt_emb = prompt_emb.reshape((1, prompt_emb.shape[0]*prompt_emb.shape[1], -1))
 

diffsynth/prompts/utils.py

@@ -3,12 +3,12 @@ from ..models import ModelManager
 import os
 
 
-def tokenize_long_prompt(tokenizer, prompt):
+def tokenize_long_prompt(tokenizer, prompt, max_length=99999999):
     # Get model_max_length from self.tokenizer
     length = tokenizer.model_max_length
 
     # To avoid the warning. set self.tokenizer.model_max_length to +oo.
-    tokenizer.model_max_length = 99999999
+    tokenizer.model_max_length = max_length
 
     # Tokenize it!
     input_ids = tokenizer(prompt, return_tensors="pt").input_ids