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import numpy as np |
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import torch |
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def get_teacache_coefficients(model_name): |
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if "wan2.1-t2v-1.3b" in model_name.lower() or "wan2.1-fun-1.3b" in model_name.lower() \ |
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or "wan2.1-fun-v1.1-1.3b" in model_name.lower() or "wan2.1-vace-1.3b" in model_name.lower(): |
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return [-5.21862437e+04, 9.23041404e+03, -5.28275948e+02, 1.36987616e+01, -4.99875664e-02] |
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elif "wan2.1-t2v-14b" in model_name.lower(): |
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return [-3.03318725e+05, 4.90537029e+04, -2.65530556e+03, 5.87365115e+01, -3.15583525e-01] |
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elif "wan2.1-i2v-14b-480p" in model_name.lower(): |
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return [2.57151496e+05, -3.54229917e+04, 1.40286849e+03, -1.35890334e+01, 1.32517977e-01] |
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elif "wan2.1-i2v-14b-720p" in model_name.lower() or "wan2.1-fun-14b" in model_name.lower() or "wan2.2-fun" in model_name.lower() \ |
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or "wan2.2-i2v-a14b" in model_name.lower() or "wan2.2-t2v-a14b" in model_name.lower() or "wan2.2-ti2v-5b" in model_name.lower() \ |
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or "wan2.2-s2v" in model_name.lower() or "wan2.1-vace-14b" in model_name.lower() or "wan2.2-vace-fun" in model_name.lower(): |
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return [8.10705460e+03, 2.13393892e+03, -3.72934672e+02, 1.66203073e+01, -4.17769401e-02] |
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else: |
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print(f"The model {model_name} is not supported by TeaCache.") |
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return None |
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class TeaCache(): |
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""" |
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Timestep Embedding Aware Cache, a training-free caching approach that estimates and leverages |
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the fluctuating differences among model outputs across timesteps, thereby accelerating the inference. |
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Please refer to: |
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1. https://github.com/ali-vilab/TeaCache. |
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2. Liu, Feng, et al. "Timestep Embedding Tells: It's Time to Cache for Video Diffusion Model." arXiv preprint arXiv:2411.19108 (2024). |
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""" |
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def __init__( |
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self, |
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coefficients: list[float], |
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num_steps: int, |
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rel_l1_thresh: float = 0.0, |
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num_skip_start_steps: int = 0, |
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offload: bool = True, |
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): |
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if num_steps < 1: |
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raise ValueError(f"`num_steps` must be greater than 0 but is {num_steps}.") |
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if rel_l1_thresh < 0: |
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raise ValueError(f"`rel_l1_thresh` must be greater than or equal to 0 but is {rel_l1_thresh}.") |
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if num_skip_start_steps < 0 or num_skip_start_steps > num_steps: |
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raise ValueError( |
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"`num_skip_start_steps` must be great than or equal to 0 and " |
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f"less than or equal to `num_steps={num_steps}` but is {num_skip_start_steps}." |
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) |
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self.coefficients = coefficients |
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self.num_steps = num_steps |
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self.rel_l1_thresh = rel_l1_thresh |
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self.num_skip_start_steps = num_skip_start_steps |
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self.offload = offload |
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self.rescale_func = np.poly1d(self.coefficients) |
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self.cnt = 0 |
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self.should_calc = True |
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self.accumulated_rel_l1_distance = 0 |
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self.previous_modulated_input = None |
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self.previous_residual = None |
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self.previous_residual_cond = None |
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self.previous_residual_uncond = None |
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@staticmethod |
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def compute_rel_l1_distance(prev: torch.Tensor, cur: torch.Tensor) -> torch.Tensor: |
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rel_l1_distance = (torch.abs(cur - prev).mean()) / torch.abs(prev).mean() |
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return rel_l1_distance.cpu().item() |
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def reset(self): |
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self.cnt = 0 |
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self.should_calc = True |
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self.accumulated_rel_l1_distance = 0 |
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self.previous_modulated_input = None |
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self.previous_residual = None |
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self.previous_residual_cond = None |
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self.previous_residual_uncond = None |
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