stable_video_diffusion_pipeline.py

#
# Copyright 2024 The HuggingFace Inc. team.
# SPDX-FileCopyrightText: Copyright (c) 1993-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

from cuda import cudart
from diffusers.image_processor import VaeImageProcessor
from diffusers.utils.torch_utils import randn_tensor
from models import (
    CLIPImageProcessorModel,
    CLIPVisionWithProjModel,
    UNetTemporalModel,
    VAEDecTemporalModel,
)
import os
import pathlib
import tensorrt as trt
import time
import torch
import random
from tqdm.auto import tqdm
from typing import Optional
from utilities import (
    GiB,
    PIPELINE_TYPE,
    TRT_LOGGER,
    Engine,
    _append_dims,
    _resize_with_antialiasing,
    tensor2vid,
)
from stable_diffusion_pipeline import StableDiffusionPipeline

class StableVideoDiffusionPipeline(StableDiffusionPipeline):
    """
    Application showcasing the acceleration of Stable Video Diffusion pipelines using NVidia TensorRT.
    """
    def __init__(
        self,
        version='svd-xt-1.1',
        pipeline_type=PIPELINE_TYPE.IMG2VID,
        min_guidance_scale: float = 1.0,
        max_guidance_scale: float = 3.0,
        decode_chunk_size: Optional[int] = None,
        **kwargs
    ):
        """
        Initializes the Diffusion pipeline.

        Args:
            version (str):
                The version of the pipeline. Should be one of [svd-xt-1.1]
            pipeline_type (PIPELINE_TYPE):
                Type of current pipeline.
            min_guidance_scale (`float`, *optional*, defaults to 1.0):
                The minimum guidance scale. Used for the classifier free guidance with first frame.
            max_guidance_scale (`float`, *optional*, defaults to 3.0):
                The maximum guidance scale. Used for the classifier free guidance with last frame.
                `max_guidance_scale = 1` corresponds to doing no classifier free guidance.
            decode_chunk_size (`int`, *optional*):
                The number of frames to decode at a time. The higher the chunk size, the higher the temporal consistency
                between frames, but also the higher the memory consumption. By default, the decoder will decode all frames at once
                for maximal quality. Reduce `decode_chunk_size` to reduce memory usage.
        """
        super().__init__(
            version=version,
            pipeline_type=pipeline_type,
            **kwargs
        )
        self.min_guidance_scale = min_guidance_scale
        self.max_guidance_scale = max_guidance_scale
        self.do_classifier_free_guidance = max_guidance_scale > 1
        # FIXME vae_scale_factor = 2 ** (len(self.vae.config.block_out_channels) - 1)
        self.vae_scale_factor = 8
        # FIXME num_frames = self.config.num_frames
        select_num_frames = {
            'svd-xt-1.1': 25,
        }
        self.num_frames = select_num_frames.get(version, 14)
        # TODO decode_chunk_size from args
        self.decode_chunk_size = 8 if not decode_chunk_size else decode_chunk_size
        # TODO: scaling_factor = vae.config.scaling_factor
        self.scaling_factor = 0.18215

        # TODO user configurable cuda_device_id
        cuda_device_id = 0
        vram_size = cudart.cudaGetDeviceProperties(cuda_device_id)[1].totalGlobalMem
        self.low_vram = vram_size < GiB(40)
        if self.low_vram:
            print(f"[W] WARNING low VRAM ({vram_size/GiB(1):.2f} GB) mode selected. Certain optimizations may be skipped.")
        if self.use_cuda_graph and self.low_vram:
            print(f"[W] WARNING CUDA graph disabled in low VRAM mode.")
            self.use_cuda_graph = False

        self.config = {}
        if self.pipeline_type.is_img2vid():
            self.config['clip_vis_torch_fallback'] = True
            self.config['clip_imgfe_torch_fallback'] = True
            self.config['vae_temp_torch_fallback'] = True

        # initialized in loadEngines()
        self.max_shared_device_memory_size = 0

    def loadResources(self, image_height, image_width, batch_size, seed):
        # Initialize noise generator
        self.seed = seed
        self.generator = torch.Generator(device="cuda").manual_seed(seed) if seed else None

        # Create CUDA events and stream
        for stage in ['clip', 'denoise', 'vae', 'vae_encoder']:
            self.events[stage] = [cudart.cudaEventCreate()[1], cudart.cudaEventCreate()[1]]
        self.stream = cudart.cudaStreamCreate()[1]

        # Allocate shared device memory for TensorRT engines
        if not self.low_vram and not self.torch_inference:
            for model_name in self.models.keys():
                if not self.torch_fallback[model_name]:
                    self.max_shared_device_memory_size = max(self.max_shared_device_memory_size, self.engine[model_name].engine.device_memory_size)
            self.shared_device_memory = cudart.cudaMalloc(self.max_shared_device_memory_size)[1]
            # Activate TensorRT engines
            for model_name in self.models.keys():
                if not self.torch_fallback[model_name]:
                    self.engine[model_name].activate(device_memory=self.shared_device_memory)
                    alloc_shape = self.models[model_name].get_shape_dict(batch_size, image_height, image_width)
                    self.engine[model_name].allocate_buffers(shape_dict=alloc_shape, device=self.device)

    def loadEngines(
        self,
        engine_dir,
        framework_model_dir,
        onnx_dir,
        onnx_opset,
        opt_batch_size,
        opt_image_height,
        opt_image_width,
        static_batch=False,
        static_shape=True,
        enable_refit=False,
        enable_all_tactics=False,
        timing_cache=None,
    ):
        """
        Build and load engines for TensorRT accelerated inference.
        Export ONNX models first, if applicable.

        Args:
            engine_dir (str):
                Directory to store the TensorRT engines.
            framework_model_dir (str):
                Directory to store the framework model ckpt.
            onnx_dir (str):
                Directory to store the ONNX models.
            onnx_opset (int):
                ONNX opset version to export the models.
            opt_batch_size (int):
                Batch size to optimize for during engine building.
            opt_image_height (int):
                Image height to optimize for during engine building. Must be a multiple of 8.
            opt_image_width (int):
                Image width to optimize for during engine building. Must be a multiple of 8.
            static_batch (bool):
                Build engine only for specified opt_batch_size.
            static_shape (bool):
                Build engine only for specified opt_image_height & opt_image_width. Default = True.
            enable_refit (bool):
                Build engines with refit option enabled.
            enable_all_tactics (bool):
                Enable all tactic sources during TensorRT engine builds.
            timing_cache (str):
                Path to the timing cache to speed up TensorRT build.
        """
        # Create directories if missing
        for directory in [engine_dir, onnx_dir]:
            if not os.path.exists(directory):
                print(f"[I] Create directory: {directory}")
                pathlib.Path(directory).mkdir(parents=True)

        # Load pipeline models
        models_args = {'version': self.version, 'pipeline': self.pipeline_type, 'device': self.device,
            'hf_token': self.hf_token, 'verbose': self.verbose, 'framework_model_dir': framework_model_dir,
            'max_batch_size': self.max_batch_size}
        if 'clip-vis' in self.stages:
            self.models['clip-vis'] = CLIPVisionWithProjModel(**models_args, subfolder='image_encoder')
        if 'clip-imgfe' in self.stages:
            self.models['clip-imgfe'] = CLIPImageProcessorModel(**models_args, subfolder='feature_extractor')
        if 'unet-temp' in self.stages:
            self.models['unet-temp'] = UNetTemporalModel(**models_args, fp16=True, num_frames=self.num_frames, do_classifier_free_guidance=self.do_classifier_free_guidance)
        if 'vae-temp' in self.stages:
            self.models['vae-temp'] = VAEDecTemporalModel(**models_args, decode_chunk_size=self.decode_chunk_size)
        self.image_processor = VaeImageProcessor(vae_scale_factor=self.vae_scale_factor)

        # Configure pipeline models to load
        model_names = self.models.keys()
        self.torch_fallback = dict(zip(model_names, [self.torch_inference or self.config.get(model_name.replace('-','_')+'_torch_fallback', False) for model_name in model_names]))
        onnx_path = dict(zip(model_names, [self.getOnnxPath(model_name, onnx_dir, opt=False) for model_name in model_names]))
        onnx_opt_path = dict(zip(model_names, [self.getOnnxPath(model_name, onnx_dir) for model_name in model_names]))
        engine_path = dict(zip(model_names, [self.getEnginePath(model_name, engine_dir) for model_name in model_names]))
        do_engine_refit = dict(zip(model_names, [enable_refit and model_name.startswith('unet') for model_name in model_names]))

        # Export models to ONNX
        for model_name, obj in self.models.items():
            if self.torch_fallback[model_name]:
                continue
            do_export_onnx = not os.path.exists(engine_path[model_name]) and not os.path.exists(onnx_opt_path[model_name])
            if do_export_onnx:
                obj.export_onnx(onnx_path[model_name], onnx_opt_path[model_name], onnx_opset, opt_image_height, opt_image_width)

        # Build TensorRT engines
        for model_name, obj in self.models.items():
            if self.torch_fallback[model_name]:
                continue
            engine = Engine(engine_path[model_name])
            if not os.path.exists(engine_path[model_name]):
                update_output_names = obj.get_output_names() + obj.extra_output_names if obj.extra_output_names else None
                engine.build(onnx_opt_path[model_name],
                    fp16=True,
                    input_profile=obj.get_input_profile(
                        opt_batch_size, opt_image_height, opt_image_width,
                        static_batch=static_batch, static_shape=static_shape
                    ),
                    enable_refit=do_engine_refit[model_name],
                    enable_all_tactics=enable_all_tactics,
                    timing_cache=timing_cache,
                    update_output_names=update_output_names,
                    native_instancenorm=False)
            self.engine[model_name] = engine

        # Load TensorRT engines
        for model_name in self.models.keys():
            if not self.torch_fallback[model_name]:
                self.engine[model_name].load()

    def activateEngines(self, model_name, alloc_shape=None):
        if not self.torch_fallback[model_name]:
            device_memory_update = self.low_vram and not self.shared_device_memory
            if device_memory_update:
                assert not self.use_cuda_graph
                # Reclaim GPU memory from torch cache
                torch.cuda.empty_cache()
                self.shared_device_memory = cudart.cudaMalloc(self.max_shared_device_memory_size)[1]
            # Create TensorRT execution context
            if not self.engine[model_name].context:
                assert not self.use_cuda_graph
                self.engine[model_name].activate(device_memory=self.shared_device_memory)
            if device_memory_update:
                self.engine[model_name].reactivate(device_memory=self.shared_device_memory)
            if alloc_shape and not self.engine[model_name].tensors:
                assert not self.use_cuda_graph
                self.engine[model_name].allocate_buffers(shape_dict=alloc_shape, device=self.device)
        else:
            # Load torch model
            if not model_name in self.torch_models:
                self.torch_models[model_name] = self.models[model_name].get_model(torch_inference=self.torch_inference)

    def deactivateEngines(self, model_name, release_model=True):
        if not release_model:
            return
        if not self.torch_fallback[model_name]:
            assert not self.use_cuda_graph
            self.engine[model_name].deallocate_buffers()
            self.engine[model_name].deactivate()
            # Shared device memory deallocated only in low VRAM mode
            if self.low_vram and self.shared_device_memory:
                cudart.cudaFree(self.shared_device_memory)
                self.shared_device_memory = None
        else:
            del self.torch_models[model_name]

    def print_summary(self, denoising_steps, walltime_ms, batch_size, num_frames):
        print('|-----------------|--------------|')
        print('| {:^15} | {:^12} |'.format('Module', 'Latency'))
        print('|-----------------|--------------|')
        print('| {:^15} | {:>9.2f} ms |'.format('VAE-Enc', cudart.cudaEventElapsedTime(self.events['vae_encoder'][0], self.events['vae_encoder'][1])[1]))
        print('| {:^15} | {:>9.2f} ms |'.format('CLIP', cudart.cudaEventElapsedTime(self.events['clip'][0], self.events['clip'][1])[1]))
        print('| {:^15} | {:>9.2f} ms |'.format('UNet'+('+CNet' if self.pipeline_type.is_controlnet() else '')+' x '+str(denoising_steps), cudart.cudaEventElapsedTime(self.events['denoise'][0], self.events['denoise'][1])[1]))
        print('| {:^15} | {:>9.2f} ms |'.format('VAE-Dec', cudart.cudaEventElapsedTime(self.events['vae'][0], self.events['vae'][1])[1]))
        print('|-----------------|--------------|')
        print('| {:^15} | {:>9.2f} ms |'.format('Pipeline', walltime_ms))
        print('|-----------------|--------------|')
        print('Throughput: {:.2f} videos/min ({} frames)'.format(batch_size*60000./walltime_ms, num_frames))

    def save_video(self, frames, pipeline, seed):
        video_name_prefix = '-'.join([pipeline, 'fp16', str(seed), str(random.randint(1000,9999))])
        video_name_suffix = 'torch' if self.torch_inference else 'trt'
        video_path = video_name_prefix+'-'+video_name_suffix+'.gif'
        print(f"Saving video to: {video_path}")
        frames[0].save(os.path.join(self.output_dir, video_path), save_all=True,optimize=False, append_images=frames[1:], loop=0)

    def _encode_image(self, image, num_videos_per_prompt, do_classifier_free_guidance):
        dtype = next(self.torch_models['clip-vis'].parameters()).dtype

        if not isinstance(image, torch.Tensor):
            image = self.image_processor.pil_to_numpy(image)
            image = self.image_processor.numpy_to_pt(image)

            # We normalize the image before resizing to match with the original implementation.
            # Then we unnormalize it after resizing.
            image = image * 2.0 - 1.0
            image = _resize_with_antialiasing(image, (224, 224))
            image = (image + 1.0) / 2.0

            # Normalize the image with for CLIP input
            image = self.torch_models['clip-imgfe'](
                images=image,
                do_normalize=True,
                do_center_crop=False,
                do_resize=False,
                do_rescale=False,
                return_tensors="pt",
            ).pixel_values

        image = image.to(device=self.device, dtype=dtype)
        image_embeddings = self.torch_models['clip-vis'](image).image_embeds
        image_embeddings = image_embeddings.unsqueeze(1)

        # duplicate image embeddings for each generation per prompt, using mps friendly method
        bs_embed, seq_len, _ = image_embeddings.shape
        image_embeddings = image_embeddings.repeat(1, num_videos_per_prompt, 1)
        image_embeddings = image_embeddings.view(bs_embed * num_videos_per_prompt, seq_len, -1)

        if do_classifier_free_guidance:
            negative_image_embeddings = torch.zeros_like(image_embeddings)

            # For classifier free guidance, we need to do two forward passes.
            # Here we concatenate the unconditional and text embeddings into a single batch
            # to avoid doing two forward passes
            image_embeddings = torch.cat([negative_image_embeddings, image_embeddings])

        return image_embeddings

    def _encode_vae_image(
        self,
        image: torch.Tensor,
        device,
        num_videos_per_prompt,
        do_classifier_free_guidance,
    ):
        image = image.to(device=device)
        image_latents = self.torch_models['vae-temp'].encode(image).latent_dist.mode()

        if do_classifier_free_guidance:
            negative_image_latents = torch.zeros_like(image_latents)

            # For classifier free guidance, we need to do two forward passes.
            # Here we concatenate the unconditional and text embeddings into a single batch
            # to avoid doing two forward passes
            image_latents = torch.cat([negative_image_latents, image_latents])

        # duplicate image_latents for each generation per prompt, using mps friendly method
        image_latents = image_latents.repeat(num_videos_per_prompt, 1, 1, 1)

        return image_latents

    def _get_add_time_ids(
        self,
        fps,
        motion_bucket_id,
        noise_aug_strength,
        dtype,
        batch_size,
        num_videos_per_prompt,
        do_classifier_free_guidance,
    ):
        add_time_ids = [fps, motion_bucket_id, noise_aug_strength]
        add_time_ids = torch.tensor([add_time_ids], dtype=dtype)
        add_time_ids = add_time_ids.repeat(batch_size * num_videos_per_prompt, 1)

        if do_classifier_free_guidance:
            add_time_ids = torch.cat([add_time_ids, add_time_ids])

        return add_time_ids

    def prepare_latents(
        self,
        batch_size,
        num_frames,
        num_channels_latents,
        height,
        width,
        dtype,
        device,
        latents=None,
    ):
        shape = (
            batch_size,
            num_frames,
            num_channels_latents // 2,
            height // self.vae_scale_factor,
            width // self.vae_scale_factor,
        )

        if latents is None:
            latents = randn_tensor(shape, generator=self.generator, device=device, dtype=dtype)
        else:
            latents = latents.to(device)

        # scale the initial noise by the standard deviation required by the scheduler
        latents = latents * self.scheduler.init_noise_sigma
        return latents

    def decode_latents(self, latents, num_frames, decode_chunk_size):
        # [batch, frames, channels, height, width] -> [batch*frames, channels, height, width]
        latents = latents.flatten(0, 1)

        latents = 1 / self.scaling_factor * latents

        # decode decode_chunk_size frames at a time to avoid OOM
        frames = []
        for i in range(0, latents.shape[0], decode_chunk_size):
            num_frames_in = latents[i : i + decode_chunk_size].shape[0]
            # TODO only pass num_frames_in if it's expected
            if self.torch_fallback['vae-temp']:
                frame = self.torch_models['vae-temp'].decode(latents[i : i + decode_chunk_size], num_frames=num_frames_in).sample
            else:
                params = {
                    'latent': latents[i : i + decode_chunk_size],
                    # FIXME segfault
                    #'num_frames_in': torch.Tensor([num_frames_in]).to(device=latents.device, dtype=torch.int64),
                }
                frame = self.runEngine('vae-temp', params)['frames']
            frames.append(frame)
        frames = torch.cat(frames, dim=0)

        # [batch*frames, channels, height, width] -> [batch, channels, frames, height, width]
        frames = frames.reshape(-1, num_frames, *frames.shape[1:]).permute(0, 2, 1, 3, 4)

        # we always cast to float32 as this does not cause significant overhead and is compatible with bfloat16
        frames = frames.float()
        return frames

    def infer(
        self,
        input_image,
        image_height: int,
        image_width: int,
        fps: int = 7,
        motion_bucket_id: int = 127,
        noise_aug_strength: int = 0.02,
        num_videos_per_prompt: Optional[int] = 1,
        warmup: bool = False,
        save_video: bool = True,
    ):
        """
        Run the video diffusion pipeline.

        Args:
            input_image (image):
                Input image used to initialize the latents or to be inpainted.
            image_height (int):
                Height (in pixels) of the image to be generated. Must be a multiple of 8.
            image_width (int):
                Width (in pixels) of the image to be generated. Must be a multiple of 8.
            fps (`int`, *optional*, defaults to 7):
                Frames per second. The rate at which the generated images shall be exported to a video after generation.
                Note that Stable Diffusion Video's UNet was micro-conditioned on fps-1 during training.
            motion_bucket_id (`int`, *optional*, defaults to 127):
                The motion bucket ID. Used as conditioning for the generation. The higher the number the more motion will be in the video.
            noise_aug_strength (`int`, *optional*, defaults to 0.02):
                The amount of noise added to the init image, the higher it is the less the video will look like the init image. Increase it for more motion.
            num_videos_per_prompt (`int`, *optional*, defaults to 1):
                The number of images to generate per prompt.
            warmup (bool):
                Indicate if this is a warmup run.
            save_video (bool):
                Save the video image.
        """

        if self.generator and self.seed:
            self.generator.manual_seed(self.seed)

        # TODO
        batch_size = 1
        # Fast warmup
        denoising_steps = 1 if warmup else self.denoising_steps

        torch.cuda.synchronize()
        e2e_tic = time.perf_counter()

        class LoadModelContext:
            def __init__(ctx, model_name, alloc_shape=None, release_model=False):
                ctx.model_name = model_name
                ctx.release_model = release_model
                ctx.alloc_shape = alloc_shape
            def __enter__(ctx):
                self.activateEngines(ctx.model_name, alloc_shape=ctx.alloc_shape)
            def __exit__(ctx, exc_type, exc_val, exc_tb):
                self.deactivateEngines(ctx.model_name, release_model=ctx.release_model)

        # Release model opportunistically in TensorRT pipeline only in low VRAM mode
        release_model = self.low_vram and not self.torch_inference
        with torch.inference_mode(), torch.autocast("cuda"), trt.Runtime(TRT_LOGGER):
            with LoadModelContext('clip-imgfe', release_model=release_model), LoadModelContext('clip-vis', release_model=release_model):
                self.profile_start('clip', color='green')
                image_embeddings = self._encode_image(input_image, num_videos_per_prompt, self.do_classifier_free_guidance)
                self.profile_stop('clip')
            # NOTE Stable Diffusion Video was conditioned on fps - 1
            fps = fps - 1

            self.profile_start('preprocess', color='pink')
            input_image = self.image_processor.preprocess(input_image, height=image_height, width=image_width).to(self.device)
            noise = randn_tensor(input_image.shape, generator=self.generator, device=input_image.device, dtype=input_image.dtype)
            input_image = input_image + noise_aug_strength * noise
            self.profile_stop('preprocess')

            # TODO
            # assert self.torch_models['vae-temp'].dtype == torch.float32

            with LoadModelContext('vae-temp'):
                self.profile_start('vae_encoder', color='red')
                image_latents = self._encode_vae_image(input_image, self.device, num_videos_per_prompt, self.do_classifier_free_guidance)
                image_latents = image_latents.to(image_embeddings.dtype)
                self.profile_stop('vae_encoder')

            # Repeat the image latents for each frame so we can concatenate them with the noise
            # image_latents [batch, channels, height, width] ->[batch, num_frames, channels, height, width]
            image_latents = image_latents.unsqueeze(1).repeat(1, self.num_frames, 1, 1, 1)

            # Get Added Time IDs
            added_time_ids = self._get_add_time_ids(
                fps,
                motion_bucket_id,
                noise_aug_strength,
                image_embeddings.dtype,
                batch_size,
                num_videos_per_prompt,
                self.do_classifier_free_guidance,
            )
            added_time_ids = added_time_ids.to(self.device)

            # Prepare timesteps
            self.scheduler.set_timesteps(denoising_steps, device=self.device)
            timesteps = self.scheduler.timesteps

            # Prepare latent variables
            latents = self.prepare_latents(
                batch_size * num_videos_per_prompt,
                self.num_frames,
                8, # TODO: num_channels_latents = unet.config.in_channels
                image_height,
                image_width,
                image_embeddings.dtype,
                input_image.device,
                None, # pre-generated latents
            )

            # Prepare guidance scale
            guidance_scale = torch.linspace(self.min_guidance_scale, self.max_guidance_scale, self.num_frames).unsqueeze(0)
            guidance_scale = guidance_scale.to(self.device, latents.dtype)
            guidance_scale = guidance_scale.repeat(batch_size * num_videos_per_prompt, 1)
            guidance_scale = _append_dims(guidance_scale, latents.ndim)

            # Denoising loop
            num_warmup_steps = len(timesteps) - denoising_steps * self.scheduler.order
            unet_shape_dict = self.models['unet-temp'].get_shape_dict(batch_size, image_height, image_width)
            with LoadModelContext('unet-temp', alloc_shape=unet_shape_dict, release_model=release_model), tqdm(total=denoising_steps) as progress_bar:
                self.profile_start('denoise', color='blue')
                for i, t in enumerate(timesteps):
                    # expand the latents if we are doing classifier free guidance
                    latent_model_input = torch.cat([latents] * 2) if self.do_classifier_free_guidance else latents
                    latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)

                    # Concatenate image_latents over channels dimention
                    latent_model_input = torch.cat([latent_model_input, image_latents], dim=2)

                    # predict the noise residual
                    if self.torch_fallback['unet-temp']:
                        noise_pred = self.torch_models['unet-temp'](
                            latent_model_input,
                            t,
                            encoder_hidden_states=image_embeddings,
                            added_time_ids=added_time_ids,
                            return_dict=False,
                        )[0]
                    else:
                        params = {
                            "sample": latent_model_input,
                            "timestep": t,
                            "encoder_hidden_states": image_embeddings,
                            "added_time_ids": added_time_ids,
                        }
                        noise_pred = self.runEngine('unet-temp', params)['latent']

                    # perform guidance
                    if self.do_classifier_free_guidance:
                        noise_pred_uncond, noise_pred_cond = noise_pred.chunk(2)
                        noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_cond - noise_pred_uncond)

                    # compute the previous noisy sample x_t -> x_t-1
                    latents = self.scheduler.step(noise_pred, t, latents).prev_sample

                    if i == len(timesteps) - 1 or ((i + 1) > num_warmup_steps and (i + 1) % self.scheduler.order == 0):
                        progress_bar.update()
                self.profile_stop('denoise')

        with torch.inference_mode(), trt.Runtime(TRT_LOGGER), LoadModelContext('vae-temp'):
            self.profile_start('vae', color='red')
            self.torch_models['vae-temp'].to(dtype=torch.float16)
            frames = self.decode_latents(latents, self.num_frames, self.decode_chunk_size)
            frames = tensor2vid(frames, self.image_processor, output_type='pil')
            self.profile_stop('vae')

        torch.cuda.synchronize()

        if warmup:
            return

        e2e_toc = time.perf_counter()
        walltime_ms = (e2e_toc - e2e_tic) * 1000.
        self.print_summary(denoising_steps, walltime_ms, batch_size, len(frames[0]))
        if save_video:
            self.save_video(frames[0], self.pipeline_type.name.lower(), self.seed)

        return frames, walltime_ms

    def run(self, input_image, height, width, batch_size, batch_count, num_warmup_runs, use_cuda_graph, **kwargs):
        num_warmup_runs = max(1, num_warmup_runs) if use_cuda_graph else num_warmup_runs
        if num_warmup_runs > 0:
            print("[I] Warming up ..")
            for _ in range(num_warmup_runs):
                self.infer(input_image, height, width, warmup=True)

        for _ in range(batch_count):
            print("[I] Running StableDiffusion pipeline")
            if self.nvtx_profile:
                cudart.cudaProfilerStart()
            self.infer(input_image, height, width, warmup=False)
            if self.nvtx_profile:
                cudart.cudaProfilerStop()