Import torch2 adaptation file

text2vid_torch2.py

@@ -0,0 +1,707 @@
+from typing import Any, Callable, Dict, List, Optional, Union
+import numpy as np
+import torch
+from transformers import CLIPTextModel, CLIPTokenizer
+from diffusers.image_processor import VaeImageProcessor
+from diffusers.models import AutoencoderKL, UNet3DConditionModel
+from diffusers.schedulers import KarrasDiffusionSchedulers
+from diffusers.utils import (deprecate,
+    logging,
+    replace_example_docstring)
+from diffusers.pipelines.text_to_video_synthesis import TextToVideoSDPipelineOutput
+from torch.nn import functional as F
+from diffusers.models.attention_processor import Attention
+import math
+
+
+TAU_2 = 15
+TAU_1 = 10
+
+
+def init_attention_params(unet, num_frames, lambda_=None, bs=None):
+    
+    
+    for name, module in unet.named_modules():
+        module_name = type(module).__name__
+        if module_name == "Attention": 
+            module.processor.LAMBDA = lambda_
+            module.processor.bs = bs
+            module.processor.num_frames = num_frames
+
+
+def scaled_dot_product_attention(query, key, value, attn_mask=None, dropout_p=0.0,
+        is_causal=False, scale=None, enable_gqa=False, k1 = None, d_l = None) -> torch.Tensor:
+    
+    L, S = query.size(-2), key.size(-2)
+    scale_factor = 1 / math.sqrt(query.size(-1)) if scale is None else scale
+    attn_bias = torch.zeros(L, S, dtype=query.dtype).to(query.device)
+    if is_causal:
+        assert attn_mask is None
+        temp_mask = torch.ones(L, S, dtype=torch.bool).tril(diagonal=0)
+        attn_bias.masked_fill_(temp_mask.logical_not(), float("-inf"))
+        attn_bias.to(query.dtype)
+
+    if attn_mask is not None:
+        if attn_mask.dtype == torch.bool:
+            attn_bias.masked_fill_(attn_mask.logical_not(), float("-inf"))
+        else:
+            attn_bias += attn_mask
+
+    if enable_gqa:
+        if k1 is not None and d_l is not None:
+            k1 = k1.repeat_interleave(query.size(-3)//k1.size(-3), -3)
+        key = key.repeat_interleave(query.size(-3)//key.size(-3), -3)
+        value = value.repeat_interleave(query.size(-3)//value.size(-3), -3)
+
+    if k1 is not None:
+        attn_k1 = query @ k1.transpose(-2, -1)
+        attn_weight = query @ key.transpose(-2, -1)
+        attn_weight[:,:len(d_l),0] = attn_k1[:,:len(d_l),0] * d_l
+        attn_weight = attn_weight * scale_factor
+    else: 
+        attn_weight = query @ key.transpose(-2, -1) * scale_factor
+
+    attn_weight += attn_bias
+
+    attn_weight = torch.softmax(attn_weight, dim=-1)
+    attn_weight = torch.dropout(attn_weight, dropout_p, train=True)
+    return attn_weight @ value
+
+class AttnProcessor2_0:
+    r"""
+    Processor for implementing scaled dot-product attention (enabled by default if you're using PyTorch 2.0).
+    """
+
+    def __init__(self):
+        if not hasattr(F, "scaled_dot_product_attention"):
+            raise ImportError("AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0.")
+        
+    def __call__(
+        self,
+        attn: Attention,
+        hidden_states: torch.Tensor,
+        encoder_hidden_states: Optional[torch.Tensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        temb: Optional[torch.Tensor] = None,
+        *args,
+        **kwargs,
+    ) -> torch.Tensor:
+        if len(args) > 0 or kwargs.get("scale", None) is not None:
+            deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`."
+            deprecate("scale", "1.0.0", deprecation_message)
+
+        residual = hidden_states
+        if attn.spatial_norm is not None:
+            hidden_states = attn.spatial_norm(hidden_states, temb)
+
+        input_ndim = hidden_states.ndim
+
+        if input_ndim == 4:
+            batch_size, channel, height, width = hidden_states.shape
+            hidden_states = hidden_states.view(batch_size, channel, height * width).transpose(1, 2)
+
+        batch_size, sequence_length, _ = (
+            hidden_states.shape if encoder_hidden_states is None else encoder_hidden_states.shape
+        )
+
+        if attention_mask is not None:
+            attention_mask = attn.prepare_attention_mask(attention_mask, sequence_length, batch_size)
+            # scaled_dot_product_attention expects attention_mask shape to be
+            # (batch, heads, source_length, target_length)
+            attention_mask = attention_mask.view(batch_size, attn.heads, -1, attention_mask.shape[-1])
+
+        if attn.group_norm is not None:
+            hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2)
+
+        query = attn.to_q(hidden_states)
+
+        if encoder_hidden_states is None:
+            encoder_hidden_states = hidden_states
+        elif attn.norm_cross:
+            encoder_hidden_states = attn.norm_encoder_hidden_states(encoder_hidden_states)
+
+        key = attn.to_k(encoder_hidden_states)
+        value = attn.to_v(encoder_hidden_states)
+
+        inner_dim = key.shape[-1]
+        head_dim = inner_dim // attn.heads
+
+        query, key, d_l, k1 = self.get_qk(query, key)
+
+        
+            
+
+        query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
+
+        key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
+        value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
+        
+        # the output of sdp = (batch, num_heads, seq_len, head_dim)
+        # TODO: add support for attn.scale when we move to Torch 2.1
+
+        if d_l is not None:
+            k1 = k1.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
+            hidden_states = scaled_dot_product_attention(
+                query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False, k1 = k1, d_l = d_l
+            )
+        else: 
+
+            hidden_states = scaled_dot_product_attention(
+                query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False
+            )
+
+        hidden_states = hidden_states.transpose(1, 2).reshape(batch_size, -1, attn.heads * head_dim)
+        hidden_states = hidden_states.to(query.dtype)
+
+        # linear proj
+        hidden_states = attn.to_out[0](hidden_states)
+        # dropout
+        hidden_states = attn.to_out[1](hidden_states)
+
+        if input_ndim == 4:
+            hidden_states = hidden_states.transpose(-1, -2).reshape(batch_size, channel, height, width)
+
+        if attn.residual_connection:
+            hidden_states = hidden_states + residual
+
+        hidden_states = hidden_states / attn.rescale_output_factor
+
+        return hidden_states
+    
+    def get_qk(
+        self, query, key):
+        r"""
+        Compute the attention scores.
+
+        Args:
+            query (`torch.Tensor`): The query tensor.
+            key (`torch.Tensor`): The key tensor.
+            attention_mask (`torch.Tensor`, *optional*): The attention mask to use. If `None`, no mask is applied.
+
+        Returns:
+            `torch.Tensor`: The attention probabilities/scores.
+        """
+       
+        
+        
+        q_old = query.clone()
+        k_old = key.clone()
+        dynamic_lambda = None
+        key1 = None
+        
+        if self.use_last_attn_slice:# and self.last_attn_slice[0].shape[0] == query.shape[0]:# and query.shape[1]==self.num_frames:
+            
+            if self.last_attn_slice is not None:
+                
+                query_list = self.last_attn_slice[0]
+                key_list = self.last_attn_slice[1]  
+
+
+                if query.shape[1] == self.num_frames and query.shape == key.shape:
+                    
+                    key1 = key.clone()
+                    key1[:,:1,:key_list.shape[2]] = key_list[:,:1]
+                    dynamic_lambda = torch.tensor([1 + self.LAMBDA * (i/50) for i in range(self.num_frames)]).to(key.dtype).cuda()
+                    
+                if q_old.shape == k_old.shape and q_old.shape[1]!=self.num_frames:
+                    
+                    batch_dim = query_list.shape[0] // self.bs
+                    all_dim = query.shape[0] // self.bs
+                    for i in range(self.bs):
+                        query[i*all_dim:(i*all_dim) + batch_dim,:query_list.shape[1],:query_list.shape[2]] = query_list[i*batch_dim:(i+1)*batch_dim]
+                    
+        if self.save_last_attn_slice:
+
+            self.last_attn_slice = [
+                query,
+                key,
+                ]
+
+            self.save_last_attn_slice = False
+    
+
+        return query, key, dynamic_lambda, key1
+    
+
+def init_attention_func(unet):
+
+    for name, module in unet.named_modules():
+        module_name = type(module).__name__
+        if module_name == "Attention":
+            
+            module.set_processor(AttnProcessor2_0())
+            module.processor.last_attn_slice = None
+            module.processor.use_last_attn_slice = False
+            module.processor.save_last_attn_slice = False
+            module.processor.LAMBDA = 0
+            module.processor.num_frames = None
+            module.processor.bs = 0
+            
+    
+    return unet
+            
+
+def use_last_self_attention(unet, use=True):
+    for name, module in unet.named_modules():
+        module_name = type(module).__name__
+        if module_name == "Attention" and "attn1" in name:
+            module.processor.use_last_attn_slice = use
+            
+def save_last_self_attention(unet, save=True):
+    for name, module in unet.named_modules():
+        module_name = type(module).__name__
+        if module_name == "Attention" and "attn1" in name:
+            module.processor.save_last_attn_slice = save
+
+
+logger = logging.get_logger(__name__)  # pylint: disable=invalid-name
+
+EXAMPLE_DOC_STRING = """
+    Examples:
+        ```py
+        >>> import torch
+        >>> from diffusers import TextToVideoSDPipeline
+        >>> from diffusers.utils import export_to_video
+
+        >>> pipe = TextToVideoSDPipeline.from_pretrained(
+        ...     "damo-vilab/text-to-video-ms-1.7b", torch_dtype=torch.float16, variant="fp16"
+        ... )
+        >>> pipe.enable_model_cpu_offload()
+
+        >>> prompt = "Spiderman is surfing"
+        >>> video_frames = pipe(prompt).frames[0]
+        >>> video_path = export_to_video(video_frames)
+        >>> video_path
+        ```
+"""
+
+
+# Copied from diffusers.pipelines.animatediff.pipeline_animatediff.tensor2vid
+def tensor2vid(video: torch.Tensor, processor: "VaeImageProcessor", output_type: str = "np"):
+    batch_size, channels, num_frames, height, width = video.shape
+    outputs = []
+    for batch_idx in range(batch_size):
+        batch_vid = video[batch_idx].permute(1, 0, 2, 3)
+        batch_output = processor.postprocess(batch_vid, output_type)
+
+        outputs.append(batch_output)
+
+    if output_type == "np":
+        outputs = np.stack(outputs)
+
+    elif output_type == "pt":
+        outputs = torch.stack(outputs)
+
+    elif not output_type == "pil":
+        raise ValueError(f"{output_type} does not exist. Please choose one of ['np', 'pt', 'pil']")
+
+    return outputs
+
+from diffusers import TextToVideoSDPipeline
+class TextToVideoSDPipelineModded(TextToVideoSDPipeline):
+    def __init__(
+        self,
+        vae: AutoencoderKL,
+        text_encoder: CLIPTextModel,
+        tokenizer: CLIPTokenizer,
+        unet: UNet3DConditionModel,
+        scheduler: KarrasDiffusionSchedulers,
+    ):
+        super().__init__(vae, text_encoder, tokenizer, unet, scheduler)
+        
+
+    def call_network(self,
+                    negative_prompt_embeds,
+                    prompt_embeds,
+                    latents,
+                    inv_latents,
+                    t,
+                    i,
+                    null_embeds,
+                    cross_attention_kwargs,
+                    extra_step_kwargs,
+                    do_classifier_free_guidance,
+                    guidance_scale,
+                    ):
+         
+
+        inv_latent_model_input = inv_latents
+        inv_latent_model_input = self.scheduler.scale_model_input(inv_latent_model_input, t)
+        
+        latent_model_input = latents
+        latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
+        
+
+        if do_classifier_free_guidance: 
+            noise_pred_uncond = self.unet(
+                latent_model_input,
+                t,
+                encoder_hidden_states=negative_prompt_embeds, 
+                cross_attention_kwargs=cross_attention_kwargs,
+                return_dict=False,
+            )[0]
+
+            noise_null_pred_uncond = self.unet(
+                    inv_latent_model_input,
+                    t,
+                    encoder_hidden_states=negative_prompt_embeds, 
+                    cross_attention_kwargs=cross_attention_kwargs,
+                    return_dict=False,
+                )[0]
+
+                    
+                    
+        if i<=TAU_2:
+            save_last_self_attention(self.unet)
+            
+
+            noise_null_pred = self.unet(
+                    inv_latent_model_input,
+                    t,
+                    encoder_hidden_states=null_embeds, 
+                    cross_attention_kwargs=cross_attention_kwargs,
+                    return_dict=False,
+                )[0]
+            
+            if do_classifier_free_guidance:
+                noise_null_pred = noise_null_pred_uncond + guidance_scale * (noise_null_pred - noise_null_pred_uncond)
+            
+            bsz, channel, frames, width, height = inv_latents.shape
+        
+            inv_latents = inv_latents.permute(0, 2, 1, 3, 4).reshape(bsz*frames, channel, height, width)
+            noise_null_pred = noise_null_pred.permute(0, 2, 1, 3, 4).reshape(bsz*frames, channel, height, width)
+            inv_latents = self.scheduler.step(noise_null_pred, t, inv_latents, **extra_step_kwargs).prev_sample
+            inv_latents = inv_latents[None, :].reshape((bsz, frames , -1) + inv_latents.shape[2:]).permute(0, 2, 1, 3, 4)
+
+            use_last_self_attention(self.unet)
+        else:
+            noise_null_pred = None
+            
+        
+    
+        
+        noise_pred = self.unet(
+            latent_model_input,
+            t,
+            encoder_hidden_states=prompt_embeds, # For unconditional guidance
+            cross_attention_kwargs=cross_attention_kwargs,
+            return_dict=False,
+        )[0]
+
+        use_last_self_attention(self.unet, False)  
+        
+
+        if do_classifier_free_guidance:
+            noise_pred_text = noise_pred
+            noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
+
+        # reshape latents
+        bsz, channel, frames, width, height = latents.shape
+        latents = latents.permute(0, 2, 1, 3, 4).reshape(bsz * frames, channel, width, height)
+        noise_pred = noise_pred.permute(0, 2, 1, 3, 4).reshape(bsz * frames, channel, width, height)
+
+        # compute the previous noisy sample x_t -> x_t-1
+        latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample
+
+        
+
+        # reshape latents back
+        latents = latents[None, :].reshape(bsz, frames, channel, width, height).permute(0, 2, 1, 3, 4)
+
+
+        return {
+            "latents": latents, 
+            "inv_latents": inv_latents,
+            "noise_pred": noise_pred,
+            "noise_null_pred": noise_null_pred,
+            }
+                
+    def optimize_latents(self, latents, inv_latents, t, i, null_embeds, cross_attention_kwargs, prompt_embeds):
+        inv_scaled = self.scheduler.scale_model_input(inv_latents, t)  
+                    
+        noise_null_pred = self.unet(
+            inv_scaled[:,:,0:1,:,:],
+            t,
+            encoder_hidden_states=null_embeds,
+            cross_attention_kwargs=cross_attention_kwargs,
+            return_dict=False,
+        )[0]
+
+        with torch.enable_grad():
+            
+            latent_train = latents[:,:,1:,:,:].clone().detach().requires_grad_(True)
+            optimizer = torch.optim.Adam([latent_train], lr=1e-3)
+
+            for j in range(10): 
+                latent_in = torch.cat([inv_latents[:,:,0:1,:,:].detach(), latent_train], dim=2)
+                latent_input_unet = self.scheduler.scale_model_input(latent_in, t)
+
+                noise_pred = self.unet(
+                    latent_input_unet,
+                    t,
+                    encoder_hidden_states=prompt_embeds, # For unconditional guidance
+                    cross_attention_kwargs=cross_attention_kwargs,
+                    return_dict=False,
+                )[0]
+                
+                loss = torch.nn.functional.mse_loss(noise_pred[:,:,0,:,:], noise_null_pred[:,:,0,:,:])
+                
+                loss.backward()
+
+                optimizer.step()
+                optimizer.zero_grad()
+
+                print("Iteration {} Subiteration {} Loss {} ".format(i, j, loss.item()))
+            latents = latent_in.detach()
+        return latents
+
+    @torch.no_grad()
+    @replace_example_docstring(EXAMPLE_DOC_STRING)
+    def __call__(
+        self,
+        prompt: Union[str, List[str]] = None,
+        height: Optional[int] = None,
+        width: Optional[int] = None,
+        num_frames: int = 16,
+        num_inference_steps: int = 50,
+        guidance_scale: float = 9.0,
+        negative_prompt: Optional[Union[str, List[str]]] = None,
+        eta: float = 0.0,
+        generator: Optional[Union[torch.Generator, List[torch.Generator]]] = None,
+        latents: Optional[torch.FloatTensor] = None,
+        inv_latents: Optional[torch.FloatTensor] = None,
+        prompt_embeds: Optional[torch.FloatTensor] = None,
+        negative_prompt_embeds: Optional[torch.FloatTensor] = None,
+        output_type: Optional[str] = "np",
+        return_dict: bool = True,
+        callback: Optional[Callable[[int, int, torch.FloatTensor], None]] = None,
+        callback_steps: int = 1,
+        cross_attention_kwargs: Optional[Dict[str, Any]] = None,
+        clip_skip: Optional[int] = None,
+        lambda_ = 0.5,
+    ):
+        r"""
+        The call function to the pipeline for generation.
+
+        Args:
+            prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts to guide image generation. If not defined, you need to pass `prompt_embeds`.
+            height (`int`, *optional*, defaults to `self.unet.config.sample_size * self.vae_scale_factor`):
+                The height in pixels of the generated video.
+            width (`int`, *optional*, defaults to `self.unet.config.sample_size * self.vae_scale_factor`):
+                The width in pixels of the generated video.
+            num_frames (`int`, *optional*, defaults to 16):
+                The number of video frames that are generated. Defaults to 16 frames which at 8 frames per seconds
+                amounts to 2 seconds of video.
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality videos at the
+                expense of slower inference.
+            guidance_scale (`float`, *optional*, defaults to 7.5):
+                A higher guidance scale value encourages the model to generate images closely linked to the text
+                `prompt` at the expense of lower image quality. Guidance scale is enabled when `guidance_scale > 1`.
+            negative_prompt (`str` or `List[str]`, *optional*):
+                The prompt or prompts to guide what to not include in image generation. If not defined, you need to
+                pass `negative_prompt_embeds` instead. Ignored when not using guidance (`guidance_scale < 1`).
+            num_images_per_prompt (`int`, *optional*, defaults to 1):
+                The number of images to generate per prompt.
+            eta (`float`, *optional*, defaults to 0.0):
+                Corresponds to parameter eta (η) from the [DDIM](https://arxiv.org/abs/2010.02502) paper. Only applies
+                to the [`~schedulers.DDIMScheduler`], and is ignored in other schedulers.
+            generator (`torch.Generator` or `List[torch.Generator]`, *optional*):
+                A [`torch.Generator`](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make
+                generation deterministic.
+            latents (`torch.FloatTensor`, *optional*):
+                Pre-generated noisy latents sampled from a Gaussian distribution, to be used as inputs for video
+                generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
+                tensor is generated by sampling using the supplied random `generator`. Latents should be of shape
+                `(batch_size, num_channel, num_frames, height, width)`.
+            prompt_embeds (`torch.FloatTensor`, *optional*):
+                Pre-generated text embeddings. Can be used to easily tweak text inputs (prompt weighting). If not
+                provided, text embeddings are generated from the `prompt` input argument.
+            negative_prompt_embeds (`torch.FloatTensor`, *optional*):
+                Pre-generated negative text embeddings. Can be used to easily tweak text inputs (prompt weighting). If
+                not provided, `negative_prompt_embeds` are generated from the `negative_prompt` input argument.
+            output_type (`str`, *optional*, defaults to `"np"`):
+                The output format of the generated video. Choose between `torch.FloatTensor` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipelines.text_to_video_synthesis.TextToVideoSDPipelineOutput`] instead
+                of a plain tuple.
+            callback (`Callable`, *optional*):
+                A function that calls every `callback_steps` steps during inference. The function is called with the
+                following arguments: `callback(step: int, timestep: int, latents: torch.FloatTensor)`.
+            callback_steps (`int`, *optional*, defaults to 1):
+                The frequency at which the `callback` function is called. If not specified, the callback is called at
+                every step.
+            cross_attention_kwargs (`dict`, *optional*):
+                A kwargs dictionary that if specified is passed along to the [`AttentionProcessor`] as defined in
+                [`self.processor`](https://github.com/huggingface/diffusers/blob/main/src/diffusers/models/attention_processor.py).
+            clip_skip (`int`, *optional*):
+                Number of layers to be skipped from CLIP while computing the prompt embeddings. A value of 1 means that
+                the output of the pre-final layer will be used for computing the prompt embeddings.
+        Examples:
+
+        Returns:
+            [`~pipelines.text_to_video_synthesis.TextToVideoSDPipelineOutput`] or `tuple`:
+                If `return_dict` is `True`, [`~pipelines.text_to_video_synthesis.TextToVideoSDPipelineOutput`] is
+                returned, otherwise a `tuple` is returned where the first element is a list with the generated frames.
+        """
+        # 0. Default height and width to unet
+        height = height or self.unet.config.sample_size * self.vae_scale_factor
+        width = width or self.unet.config.sample_size * self.vae_scale_factor
+
+        num_images_per_prompt = 1
+
+        # 1. Check inputs. Raise error if not correct
+        self.check_inputs(
+            prompt, height, width, callback_steps, negative_prompt, prompt_embeds, negative_prompt_embeds
+        )
+
+        # # 2. Define call parameters
+        # if prompt is not None and isinstance(prompt, str):
+        #     batch_size = 1
+        # elif prompt is not None and isinstance(prompt, list):
+        #     batch_size = len(prompt)
+        # else:
+        #     batch_size = prompt_embeds.shape[0]
+
+        batch_size = inv_latents.shape[0]
+        device = self._execution_device
+        # here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
+        # of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
+        # corresponds to doing no classifier free guidance.
+        do_classifier_free_guidance = guidance_scale > 1.0
+
+        # 3. Encode input prompt
+        text_encoder_lora_scale = (
+            cross_attention_kwargs.get("scale", None) if cross_attention_kwargs is not None else None
+        )
+        prompt_embeds, negative_prompt_embeds = self.encode_prompt(
+            [prompt] * batch_size,
+            device,
+            num_images_per_prompt,
+            do_classifier_free_guidance,
+            [negative_prompt] * batch_size if negative_prompt is not None else None,
+            prompt_embeds=prompt_embeds,
+            negative_prompt_embeds=negative_prompt_embeds,
+            lora_scale=text_encoder_lora_scale,
+            clip_skip=clip_skip,
+        )
+        null_embeds, negative_prompt_embeds = self.encode_prompt(
+            [""] * batch_size,
+            device,
+            num_images_per_prompt,
+            do_classifier_free_guidance,
+            [negative_prompt] * batch_size if negative_prompt is not None else None,
+            prompt_embeds=None,
+            negative_prompt_embeds=negative_prompt_embeds,
+            lora_scale=text_encoder_lora_scale,
+            clip_skip=clip_skip,
+        )
+        
+        
+        
+        # 4. Prepare timesteps
+        self.scheduler.set_timesteps(num_inference_steps, device=device)
+        timesteps = self.scheduler.timesteps
+
+        # 5. Prepare latent variables
+        num_channels_latents = self.unet.config.in_channels
+        latents = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            num_frames,
+            height,
+            width,
+            prompt_embeds.dtype,
+            device,
+            generator,
+            latents,
+        )
+        inv_latents = self.prepare_latents(
+            batch_size * num_images_per_prompt,
+            num_channels_latents,
+            num_frames,
+            height,
+            width,
+            prompt_embeds.dtype,
+            device,
+            generator,
+            inv_latents,
+        )
+
+        # 6. Prepare extra step kwargs. TODO: Logic should ideally just be moved out of the pipeline
+        extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
+        
+        # 7. Denoising loop
+        num_warmup_steps = len(timesteps) - num_inference_steps * self.scheduler.order
+        
+        init_attention_func(self.unet)
+        print("Setup for Current Run")
+        print("----------------------")
+        print("Prompt ", prompt)
+        print("Batch size ", batch_size)
+        print("Num frames ", latents.shape[2])
+        print("Lambda ", lambda_)
+        
+        init_attention_params(self.unet, num_frames=latents.shape[2], lambda_=lambda_, bs = batch_size)
+        
+        iters_to_alter = [-1]#i for i in range(0, TAU_1)]
+    
+
+        with self.progress_bar(total=num_inference_steps) as progress_bar:
+            
+            mask_in = torch.zeros(latents.shape).to(dtype=latents.dtype, device=latents.device)
+            mask_in[:, :, 0, :, :] = 1
+            assert latents.shape[0] == inv_latents.shape[0], "Latents and Inverse Latents should have the same batch but got {} and {}".format(latents.shape[0], inv_latents.shape[0])
+            inv_latents = inv_latents.repeat(1,1,num_frames,1,1)
+
+            latents = inv_latents * mask_in + latents * (1-mask_in)
+            
+            
+
+            for i, t in enumerate(timesteps):
+                
+                curr_copy = max(1,num_frames - i)
+                inv_latents = inv_latents[:,:,:curr_copy, :, : ]
+                if i in iters_to_alter:
+
+                    latents = self.optimize_latents(latents, inv_latents, t, i, null_embeds, cross_attention_kwargs, prompt_embeds)
+                
+
+                output_dict = self.call_network(
+                        negative_prompt_embeds,
+                        prompt_embeds,
+                        latents,
+                        inv_latents,
+                        t,
+                        i,
+                        null_embeds,
+                        cross_attention_kwargs,
+                        extra_step_kwargs,
+                        do_classifier_free_guidance,
+                        guidance_scale,
+                    )
+                latents = output_dict["latents"]
+                inv_latents = output_dict["inv_latents"]
+               
+                # call the callback, if provided
+                if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
+                    progress_bar.update()
+                    if callback is not None and i % callback_steps == 0:
+                        step_idx = i // getattr(self.scheduler, "order", 1)
+                        callback(step_idx, t, latents)
+
+        # 8. Post processing
+        if output_type == "latent":
+            video = latents
+        else:
+            video_tensor = self.decode_latents(latents)
+            video = tensor2vid(video_tensor, self.image_processor, output_type)
+
+        # 9. Offload all models
+        self.maybe_free_model_hooks()
+
+        if not return_dict:
+            return (video,)
+
+        return TextToVideoSDPipelineOutput(frames=video)