mirror of
https://git.datalinker.icu/comfyanonymous/ComfyUI
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Implementation of VAE for Hunyuan 3D 2.1
This commit is contained in:
Yousef Rafat
parent
e18f53cca9
commit
295cdb1a81
@ -1,587 +0,0 @@
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# Original: https://github.com/Tencent/Hunyuan3D-2/blob/main/hy3dgen/shapegen/models/autoencoders/model.py
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# Since the header on their VAE source file was a bit confusing we asked for permission to use this code from tencent under the GPL license used in ComfyUI.
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import torch
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import torch.nn as nn
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import torch.nn.functional as F
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from typing import Union, Tuple, List, Callable, Optional
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import numpy as np
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from einops import repeat, rearrange
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from tqdm import tqdm
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import logging
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import comfy.ops
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ops = comfy.ops.disable_weight_init
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def generate_dense_grid_points(
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bbox_min: np.ndarray,
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bbox_max: np.ndarray,
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octree_resolution: int,
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indexing: str = "ij",
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):
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length = bbox_max - bbox_min
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num_cells = octree_resolution
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x = np.linspace(bbox_min[0], bbox_max[0], int(num_cells) + 1, dtype=np.float32)
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y = np.linspace(bbox_min[1], bbox_max[1], int(num_cells) + 1, dtype=np.float32)
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z = np.linspace(bbox_min[2], bbox_max[2], int(num_cells) + 1, dtype=np.float32)
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[xs, ys, zs] = np.meshgrid(x, y, z, indexing=indexing)
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xyz = np.stack((xs, ys, zs), axis=-1)
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grid_size = [int(num_cells) + 1, int(num_cells) + 1, int(num_cells) + 1]
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return xyz, grid_size, length
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class VanillaVolumeDecoder:
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@torch.no_grad()
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def __call__(
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self,
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latents: torch.FloatTensor,
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geo_decoder: Callable,
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bounds: Union[Tuple[float], List[float], float] = 1.01,
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num_chunks: int = 10000,
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octree_resolution: int = None,
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enable_pbar: bool = True,
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**kwargs,
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):
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device = latents.device
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dtype = latents.dtype
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batch_size = latents.shape[0]
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# 1. generate query points
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if isinstance(bounds, float):
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bounds = [-bounds, -bounds, -bounds, bounds, bounds, bounds]
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bbox_min, bbox_max = np.array(bounds[0:3]), np.array(bounds[3:6])
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xyz_samples, grid_size, length = generate_dense_grid_points(
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bbox_min=bbox_min,
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bbox_max=bbox_max,
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octree_resolution=octree_resolution,
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indexing="ij"
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)
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xyz_samples = torch.from_numpy(xyz_samples).to(device, dtype=dtype).contiguous().reshape(-1, 3)
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# 2. latents to 3d volume
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batch_logits = []
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for start in tqdm(range(0, xyz_samples.shape[0], num_chunks), desc="Volume Decoding",
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disable=not enable_pbar):
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chunk_queries = xyz_samples[start: start + num_chunks, :]
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chunk_queries = repeat(chunk_queries, "p c -> b p c", b=batch_size)
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logits = geo_decoder(queries=chunk_queries, latents=latents)
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batch_logits.append(logits)
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grid_logits = torch.cat(batch_logits, dim=1)
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grid_logits = grid_logits.view((batch_size, *grid_size)).float()
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return grid_logits
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class FourierEmbedder(nn.Module):
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"""The sin/cosine positional embedding. Given an input tensor `x` of shape [n_batch, ..., c_dim], it converts
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each feature dimension of `x[..., i]` into:
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[
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sin(x[..., i]),
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sin(f_1*x[..., i]),
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sin(f_2*x[..., i]),
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...
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sin(f_N * x[..., i]),
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cos(x[..., i]),
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cos(f_1*x[..., i]),
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cos(f_2*x[..., i]),
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...
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cos(f_N * x[..., i]),
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x[..., i] # only present if include_input is True.
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], here f_i is the frequency.
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Denote the space is [0 / num_freqs, 1 / num_freqs, 2 / num_freqs, 3 / num_freqs, ..., (num_freqs - 1) / num_freqs].
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If logspace is True, then the frequency f_i is [2^(0 / num_freqs), ..., 2^(i / num_freqs), ...];
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Otherwise, the frequencies are linearly spaced between [1.0, 2^(num_freqs - 1)].
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Args:
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num_freqs (int): the number of frequencies, default is 6;
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logspace (bool): If logspace is True, then the frequency f_i is [..., 2^(i / num_freqs), ...],
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otherwise, the frequencies are linearly spaced between [1.0, 2^(num_freqs - 1)];
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input_dim (int): the input dimension, default is 3;
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include_input (bool): include the input tensor or not, default is True.
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Attributes:
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frequencies (torch.Tensor): If logspace is True, then the frequency f_i is [..., 2^(i / num_freqs), ...],
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otherwise, the frequencies are linearly spaced between [1.0, 2^(num_freqs - 1);
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out_dim (int): the embedding size, if include_input is True, it is input_dim * (num_freqs * 2 + 1),
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otherwise, it is input_dim * num_freqs * 2.
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"""
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def __init__(self,
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num_freqs: int = 6,
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logspace: bool = True,
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input_dim: int = 3,
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include_input: bool = True,
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include_pi: bool = True) -> None:
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"""The initialization"""
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super().__init__()
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if logspace:
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frequencies = 2.0 ** torch.arange(
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num_freqs,
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dtype=torch.float32
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)
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else:
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frequencies = torch.linspace(
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1.0,
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2.0 ** (num_freqs - 1),
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num_freqs,
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dtype=torch.float32
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)
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if include_pi:
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frequencies *= torch.pi
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self.register_buffer("frequencies", frequencies, persistent=False)
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self.include_input = include_input
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self.num_freqs = num_freqs
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self.out_dim = self.get_dims(input_dim)
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def get_dims(self, input_dim):
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temp = 1 if self.include_input or self.num_freqs == 0 else 0
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out_dim = input_dim * (self.num_freqs * 2 + temp)
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return out_dim
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def forward(self, x: torch.Tensor) -> torch.Tensor:
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""" Forward process.
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Args:
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x: tensor of shape [..., dim]
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Returns:
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embedding: an embedding of `x` of shape [..., dim * (num_freqs * 2 + temp)]
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where temp is 1 if include_input is True and 0 otherwise.
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"""
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if self.num_freqs > 0:
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embed = (x[..., None].contiguous() * self.frequencies.to(device=x.device, dtype=x.dtype)).view(*x.shape[:-1], -1)
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if self.include_input:
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return torch.cat((x, embed.sin(), embed.cos()), dim=-1)
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else:
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return torch.cat((embed.sin(), embed.cos()), dim=-1)
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else:
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return x
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class CrossAttentionProcessor:
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def __call__(self, attn, q, k, v):
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out = F.scaled_dot_product_attention(q, k, v)
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return out
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class DropPath(nn.Module):
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"""Drop paths (Stochastic Depth) per sample (when applied in main path of residual blocks).
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"""
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def __init__(self, drop_prob: float = 0., scale_by_keep: bool = True):
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super(DropPath, self).__init__()
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self.drop_prob = drop_prob
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self.scale_by_keep = scale_by_keep
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def forward(self, x):
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"""Drop paths (Stochastic Depth) per sample (when applied in main path of residual blocks).
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This is the same as the DropConnect impl I created for EfficientNet, etc networks, however,
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the original name is misleading as 'Drop Connect' is a different form of dropout in a separate paper...
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See discussion: https://github.com/tensorflow/tpu/issues/494#issuecomment-532968956 ... I've opted for
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changing the layer and argument names to 'drop path' rather than mix DropConnect as a layer name and use
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'survival rate' as the argument.
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"""
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if self.drop_prob == 0. or not self.training:
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return x
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keep_prob = 1 - self.drop_prob
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shape = (x.shape[0],) + (1,) * (x.ndim - 1) # work with diff dim tensors, not just 2D ConvNets
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random_tensor = x.new_empty(shape).bernoulli_(keep_prob)
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if keep_prob > 0.0 and self.scale_by_keep:
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random_tensor.div_(keep_prob)
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return x * random_tensor
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def extra_repr(self):
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return f'drop_prob={round(self.drop_prob, 3):0.3f}'
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class MLP(nn.Module):
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def __init__(
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self, *,
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width: int,
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expand_ratio: int = 4,
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output_width: int = None,
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drop_path_rate: float = 0.0
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):
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super().__init__()
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self.width = width
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self.c_fc = ops.Linear(width, width * expand_ratio)
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self.c_proj = ops.Linear(width * expand_ratio, output_width if output_width is not None else width)
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self.gelu = nn.GELU()
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self.drop_path = DropPath(drop_path_rate) if drop_path_rate > 0. else nn.Identity()
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def forward(self, x):
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return self.drop_path(self.c_proj(self.gelu(self.c_fc(x))))
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class QKVMultiheadCrossAttention(nn.Module):
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def __init__(
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self,
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*,
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heads: int,
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width=None,
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qk_norm=False,
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norm_layer=ops.LayerNorm
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):
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super().__init__()
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self.heads = heads
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self.q_norm = norm_layer(width // heads, elementwise_affine=True, eps=1e-6) if qk_norm else nn.Identity()
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self.k_norm = norm_layer(width // heads, elementwise_affine=True, eps=1e-6) if qk_norm else nn.Identity()
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self.attn_processor = CrossAttentionProcessor()
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def forward(self, q, kv):
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_, n_ctx, _ = q.shape
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bs, n_data, width = kv.shape
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attn_ch = width // self.heads // 2
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q = q.view(bs, n_ctx, self.heads, -1)
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kv = kv.view(bs, n_data, self.heads, -1)
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k, v = torch.split(kv, attn_ch, dim=-1)
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q = self.q_norm(q)
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k = self.k_norm(k)
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q, k, v = map(lambda t: rearrange(t, 'b n h d -> b h n d', h=self.heads), (q, k, v))
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out = self.attn_processor(self, q, k, v)
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out = out.transpose(1, 2).reshape(bs, n_ctx, -1)
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return out
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class MultiheadCrossAttention(nn.Module):
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def __init__(
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self,
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*,
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width: int,
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heads: int,
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qkv_bias: bool = True,
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data_width: Optional[int] = None,
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norm_layer=ops.LayerNorm,
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qk_norm: bool = False,
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kv_cache: bool = False,
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):
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super().__init__()
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self.width = width
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self.heads = heads
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self.data_width = width if data_width is None else data_width
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self.c_q = ops.Linear(width, width, bias=qkv_bias)
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self.c_kv = ops.Linear(self.data_width, width * 2, bias=qkv_bias)
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self.c_proj = ops.Linear(width, width)
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self.attention = QKVMultiheadCrossAttention(
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heads=heads,
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width=width,
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norm_layer=norm_layer,
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qk_norm=qk_norm
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)
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self.kv_cache = kv_cache
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self.data = None
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def forward(self, x, data):
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x = self.c_q(x)
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if self.kv_cache:
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if self.data is None:
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self.data = self.c_kv(data)
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logging.info('Save kv cache,this should be called only once for one mesh')
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data = self.data
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else:
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data = self.c_kv(data)
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x = self.attention(x, data)
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x = self.c_proj(x)
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return x
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class ResidualCrossAttentionBlock(nn.Module):
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def __init__(
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self,
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*,
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width: int,
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heads: int,
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mlp_expand_ratio: int = 4,
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data_width: Optional[int] = None,
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qkv_bias: bool = True,
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norm_layer=ops.LayerNorm,
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qk_norm: bool = False
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):
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super().__init__()
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if data_width is None:
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data_width = width
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self.attn = MultiheadCrossAttention(
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width=width,
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heads=heads,
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data_width=data_width,
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qkv_bias=qkv_bias,
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norm_layer=norm_layer,
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qk_norm=qk_norm
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)
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self.ln_1 = norm_layer(width, elementwise_affine=True, eps=1e-6)
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self.ln_2 = norm_layer(data_width, elementwise_affine=True, eps=1e-6)
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self.ln_3 = norm_layer(width, elementwise_affine=True, eps=1e-6)
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self.mlp = MLP(width=width, expand_ratio=mlp_expand_ratio)
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def forward(self, x: torch.Tensor, data: torch.Tensor):
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x = x + self.attn(self.ln_1(x), self.ln_2(data))
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x = x + self.mlp(self.ln_3(x))
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return x
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class QKVMultiheadAttention(nn.Module):
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def __init__(
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self,
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*,
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heads: int,
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width=None,
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qk_norm=False,
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norm_layer=ops.LayerNorm
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):
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super().__init__()
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self.heads = heads
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self.q_norm = norm_layer(width // heads, elementwise_affine=True, eps=1e-6) if qk_norm else nn.Identity()
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self.k_norm = norm_layer(width // heads, elementwise_affine=True, eps=1e-6) if qk_norm else nn.Identity()
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def forward(self, qkv):
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bs, n_ctx, width = qkv.shape
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attn_ch = width // self.heads // 3
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qkv = qkv.view(bs, n_ctx, self.heads, -1)
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q, k, v = torch.split(qkv, attn_ch, dim=-1)
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q = self.q_norm(q)
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k = self.k_norm(k)
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q, k, v = map(lambda t: rearrange(t, 'b n h d -> b h n d', h=self.heads), (q, k, v))
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out = F.scaled_dot_product_attention(q, k, v).transpose(1, 2).reshape(bs, n_ctx, -1)
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return out
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class MultiheadAttention(nn.Module):
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def __init__(
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self,
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*,
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width: int,
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heads: int,
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qkv_bias: bool,
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norm_layer=ops.LayerNorm,
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qk_norm: bool = False,
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drop_path_rate: float = 0.0
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):
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super().__init__()
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self.width = width
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self.heads = heads
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self.c_qkv = ops.Linear(width, width * 3, bias=qkv_bias)
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self.c_proj = ops.Linear(width, width)
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self.attention = QKVMultiheadAttention(
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heads=heads,
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width=width,
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norm_layer=norm_layer,
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qk_norm=qk_norm
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)
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self.drop_path = DropPath(drop_path_rate) if drop_path_rate > 0. else nn.Identity()
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def forward(self, x):
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x = self.c_qkv(x)
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x = self.attention(x)
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x = self.drop_path(self.c_proj(x))
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return x
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class ResidualAttentionBlock(nn.Module):
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def __init__(
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self,
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*,
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width: int,
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heads: int,
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qkv_bias: bool = True,
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norm_layer=ops.LayerNorm,
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qk_norm: bool = False,
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drop_path_rate: float = 0.0,
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):
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super().__init__()
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self.attn = MultiheadAttention(
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width=width,
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heads=heads,
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qkv_bias=qkv_bias,
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norm_layer=norm_layer,
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qk_norm=qk_norm,
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drop_path_rate=drop_path_rate
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)
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self.ln_1 = norm_layer(width, elementwise_affine=True, eps=1e-6)
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self.mlp = MLP(width=width, drop_path_rate=drop_path_rate)
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self.ln_2 = norm_layer(width, elementwise_affine=True, eps=1e-6)
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def forward(self, x: torch.Tensor):
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x = x + self.attn(self.ln_1(x))
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x = x + self.mlp(self.ln_2(x))
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return x
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class Transformer(nn.Module):
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def __init__(
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self,
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*,
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width: int,
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layers: int,
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heads: int,
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qkv_bias: bool = True,
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norm_layer=ops.LayerNorm,
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qk_norm: bool = False,
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drop_path_rate: float = 0.0
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):
|
||||
super().__init__()
|
||||
self.width = width
|
||||
self.layers = layers
|
||||
self.resblocks = nn.ModuleList(
|
||||
[
|
||||
ResidualAttentionBlock(
|
||||
width=width,
|
||||
heads=heads,
|
||||
qkv_bias=qkv_bias,
|
||||
norm_layer=norm_layer,
|
||||
qk_norm=qk_norm,
|
||||
drop_path_rate=drop_path_rate
|
||||
)
|
||||
for _ in range(layers)
|
||||
]
|
||||
)
|
||||
|
||||
def forward(self, x: torch.Tensor):
|
||||
for block in self.resblocks:
|
||||
x = block(x)
|
||||
return x
|
||||
|
||||
|
||||
class CrossAttentionDecoder(nn.Module):
|
||||
|
||||
def __init__(
|
||||
self,
|
||||
*,
|
||||
out_channels: int,
|
||||
fourier_embedder: FourierEmbedder,
|
||||
width: int,
|
||||
heads: int,
|
||||
mlp_expand_ratio: int = 4,
|
||||
downsample_ratio: int = 1,
|
||||
enable_ln_post: bool = True,
|
||||
qkv_bias: bool = True,
|
||||
qk_norm: bool = False,
|
||||
label_type: str = "binary"
|
||||
):
|
||||
super().__init__()
|
||||
|
||||
self.enable_ln_post = enable_ln_post
|
||||
self.fourier_embedder = fourier_embedder
|
||||
self.downsample_ratio = downsample_ratio
|
||||
self.query_proj = ops.Linear(self.fourier_embedder.out_dim, width)
|
||||
if self.downsample_ratio != 1:
|
||||
self.latents_proj = ops.Linear(width * downsample_ratio, width)
|
||||
if self.enable_ln_post == False:
|
||||
qk_norm = False
|
||||
self.cross_attn_decoder = ResidualCrossAttentionBlock(
|
||||
width=width,
|
||||
mlp_expand_ratio=mlp_expand_ratio,
|
||||
heads=heads,
|
||||
qkv_bias=qkv_bias,
|
||||
qk_norm=qk_norm
|
||||
)
|
||||
|
||||
if self.enable_ln_post:
|
||||
self.ln_post = ops.LayerNorm(width)
|
||||
self.output_proj = ops.Linear(width, out_channels)
|
||||
self.label_type = label_type
|
||||
self.count = 0
|
||||
|
||||
def forward(self, queries=None, query_embeddings=None, latents=None):
|
||||
if query_embeddings is None:
|
||||
query_embeddings = self.query_proj(self.fourier_embedder(queries).to(latents.dtype))
|
||||
self.count += query_embeddings.shape[1]
|
||||
if self.downsample_ratio != 1:
|
||||
latents = self.latents_proj(latents)
|
||||
x = self.cross_attn_decoder(query_embeddings, latents)
|
||||
if self.enable_ln_post:
|
||||
x = self.ln_post(x)
|
||||
occ = self.output_proj(x)
|
||||
return occ
|
||||
|
||||
|
||||
class ShapeVAE(nn.Module):
|
||||
def __init__(
|
||||
self,
|
||||
*,
|
||||
embed_dim: int,
|
||||
width: int,
|
||||
heads: int,
|
||||
num_decoder_layers: int,
|
||||
geo_decoder_downsample_ratio: int = 1,
|
||||
geo_decoder_mlp_expand_ratio: int = 4,
|
||||
geo_decoder_ln_post: bool = True,
|
||||
num_freqs: int = 8,
|
||||
include_pi: bool = True,
|
||||
qkv_bias: bool = True,
|
||||
qk_norm: bool = False,
|
||||
label_type: str = "binary",
|
||||
drop_path_rate: float = 0.0,
|
||||
scale_factor: float = 1.0,
|
||||
):
|
||||
super().__init__()
|
||||
self.geo_decoder_ln_post = geo_decoder_ln_post
|
||||
|
||||
self.fourier_embedder = FourierEmbedder(num_freqs=num_freqs, include_pi=include_pi)
|
||||
|
||||
self.post_kl = ops.Linear(embed_dim, width)
|
||||
|
||||
self.transformer = Transformer(
|
||||
width=width,
|
||||
layers=num_decoder_layers,
|
||||
heads=heads,
|
||||
qkv_bias=qkv_bias,
|
||||
qk_norm=qk_norm,
|
||||
drop_path_rate=drop_path_rate
|
||||
)
|
||||
|
||||
self.geo_decoder = CrossAttentionDecoder(
|
||||
fourier_embedder=self.fourier_embedder,
|
||||
out_channels=1,
|
||||
mlp_expand_ratio=geo_decoder_mlp_expand_ratio,
|
||||
downsample_ratio=geo_decoder_downsample_ratio,
|
||||
enable_ln_post=self.geo_decoder_ln_post,
|
||||
width=width // geo_decoder_downsample_ratio,
|
||||
heads=heads // geo_decoder_downsample_ratio,
|
||||
qkv_bias=qkv_bias,
|
||||
qk_norm=qk_norm,
|
||||
label_type=label_type,
|
||||
)
|
||||
|
||||
self.volume_decoder = VanillaVolumeDecoder()
|
||||
self.scale_factor = scale_factor
|
||||
|
||||
def decode(self, latents, **kwargs):
|
||||
latents = self.post_kl(latents.movedim(-2, -1))
|
||||
latents = self.transformer(latents)
|
||||
|
||||
bounds = kwargs.get("bounds", 1.01)
|
||||
num_chunks = kwargs.get("num_chunks", 8000)
|
||||
octree_resolution = kwargs.get("octree_resolution", 256)
|
||||
enable_pbar = kwargs.get("enable_pbar", True)
|
||||
|
||||
grid_logits = self.volume_decoder(latents, self.geo_decoder, bounds=bounds, num_chunks=num_chunks, octree_resolution=octree_resolution, enable_pbar=enable_pbar)
|
||||
return grid_logits.movedim(-2, -1)
|
||||
|
||||
def encode(self, x):
|
||||
return None
|
||||
81
comfy/ldm/hunyuan3d/vae/fps.py
Normal file
81
comfy/ldm/hunyuan3d/vae/fps.py
Normal file
@ -0,0 +1,81 @@
|
||||
# replaced torch.ops.torch_cluster.fps with a manual implementation
|
||||
# to avoid having torch_cluster downloaded as dependency
|
||||
# also the dependency takes a long time to install
|
||||
|
||||
import torch
|
||||
from torch import Tensor
|
||||
import math
|
||||
|
||||
def fps(src: Tensor, batch: Tensor, sampling_ratio: float, start_random: bool = True):
|
||||
|
||||
# manually create the pointer vector
|
||||
assert src.size(0) == batch.numel()
|
||||
|
||||
batch_size = int(batch.max()) + 1
|
||||
deg = src.new_zeros(batch_size, dtype = torch.long)
|
||||
|
||||
deg.scatter_add_(0, batch, torch.ones_like(batch))
|
||||
|
||||
ptr_vec = deg.new_zeros(batch_size + 1)
|
||||
torch.cumsum(deg, 0, out=ptr_vec[1:])
|
||||
|
||||
#return fps_sampling(src, ptr_vec, ratio)
|
||||
sampled_indicies = []
|
||||
|
||||
for b in range(batch_size):
|
||||
# start and the end of each batch
|
||||
start, end = ptr_vec[b].item(), ptr_vec[b + 1].item()
|
||||
# points from the point cloud
|
||||
points = src[start:end]
|
||||
|
||||
num_points = points.size(0)
|
||||
num_samples = max(1, math.ceil(num_points * sampling_ratio))
|
||||
|
||||
selected = torch.zeros(num_samples, device = src.device, dtype = torch.long)
|
||||
distances = torch.full((num_points,), float("inf"), device = src.device)
|
||||
|
||||
# select a random start point
|
||||
if start_random:
|
||||
farthest = torch.randint(0, num_points, (1,), device = src.device)
|
||||
else: farthest = torch.tensor([0], device = src.device, dtype = torch.long)
|
||||
|
||||
for i in range(num_samples):
|
||||
selected[i] = farthest
|
||||
centroid = points[farthest].squeeze(0)
|
||||
dist = torch.norm(points - centroid, dim = 1) # compute euclidean distance
|
||||
distances = torch.minimum(distances, dist)
|
||||
farthest = torch.argmax(distances)
|
||||
|
||||
sampled_indicies.append(torch.arange(start, end)[selected])
|
||||
|
||||
return torch.cat(sampled_indicies, dim = 0)
|
||||
|
||||
|
||||
def test_fps():
|
||||
|
||||
torch.manual_seed(2025)
|
||||
|
||||
# 2 batches with different numbers of points
|
||||
points = torch.tensor([
|
||||
[0.0, 0.0, 0.0], # batch 0
|
||||
[1.0, 0.0, 0.0], # batch 0
|
||||
[2.0, 0.0, 0.0], # batch 0
|
||||
[0.0, 1.0, 0.0], # batch 1
|
||||
[0.0, 2.0, 0.0], # batch 1
|
||||
[0.0, 3.0, 0.0] # batch 1
|
||||
], dtype=torch.float)
|
||||
|
||||
batch = torch.tensor([0, 0, 0, 1, 1, 1]) # batch IDs
|
||||
|
||||
ratio = 0.5 # sample 50% of points per batch
|
||||
# jit compilation for speedups
|
||||
#optimized_fps = torch.compile(fps)
|
||||
|
||||
outputs = fps(points, batch, ratio, start_random = True)
|
||||
#outputs2 = torch.ops.torch_cluster.fps(points, batch, ratio, True) # shouldn't work
|
||||
|
||||
print(outputs)
|
||||
|
||||
if __name__ == "__main__":
|
||||
test_fps()
|
||||
|
||||
452
comfy/ldm/hunyuan3d/vae/point_attention.py
Normal file
452
comfy/ldm/hunyuan3d/vae/point_attention.py
Normal file
@ -0,0 +1,452 @@
|
||||
from transformer import MLP
|
||||
from transformer import Transformer
|
||||
import torch.nn.functional as F
|
||||
import torch.nn as nn
|
||||
from fps import fps
|
||||
import torch
|
||||
|
||||
class QKVMultiheadCrossAttention(nn.Module):
|
||||
def __init__(
|
||||
self,
|
||||
heads: int,
|
||||
n_data = None,
|
||||
width=None,
|
||||
qk_norm=False,
|
||||
norm_layer=nn.LayerNorm
|
||||
):
|
||||
super().__init__()
|
||||
self.heads = heads
|
||||
self.n_data = n_data
|
||||
self.q_norm = norm_layer(width // heads, elementwise_affine=True, eps=1e-6) if qk_norm else nn.Identity()
|
||||
self.k_norm = norm_layer(width // heads, elementwise_affine=True, eps=1e-6) if qk_norm else nn.Identity()
|
||||
|
||||
def forward(self, q, kv):
|
||||
|
||||
_, n_ctx, _ = q.shape
|
||||
bs, n_data, width = kv.shape
|
||||
|
||||
attn_ch = width // self.heads // 2
|
||||
q = q.view(bs, n_ctx, self.heads, -1)
|
||||
|
||||
kv = kv.view(bs, n_data, self.heads, -1)
|
||||
k, v = torch.split(kv, attn_ch, dim=-1)
|
||||
|
||||
q = self.q_norm(q)
|
||||
k = self.k_norm(k)
|
||||
|
||||
q, k, v = [t.permute(0, 2, 1, 3) for t in (q, k, v)]
|
||||
out = F.scaled_dot_product_attention(q, k, v)
|
||||
|
||||
out = out.transpose(1, 2).reshape(bs, n_ctx, -1)
|
||||
|
||||
return out
|
||||
|
||||
|
||||
class MultiheadCrossAttention(nn.Module):
|
||||
def __init__(
|
||||
self,
|
||||
width: int,
|
||||
heads: int,
|
||||
qkv_bias: bool = False,
|
||||
n_data = None,
|
||||
norm_layer = nn.LayerNorm,
|
||||
qk_norm: bool = False,
|
||||
kv_cache: bool = False,
|
||||
):
|
||||
super().__init__()
|
||||
|
||||
self.c_q = nn.Linear(width, width, bias=qkv_bias)
|
||||
self.c_kv = nn.Linear(width, width * 2, bias=qkv_bias)
|
||||
self.c_proj = nn.Linear(width, width)
|
||||
|
||||
self.attention = QKVMultiheadCrossAttention(
|
||||
heads = heads,
|
||||
n_data = n_data,
|
||||
width = width,
|
||||
norm_layer = norm_layer,
|
||||
qk_norm = qk_norm
|
||||
)
|
||||
|
||||
self.kv_cache = kv_cache
|
||||
self.data = None
|
||||
|
||||
def forward(self, x, data):
|
||||
x = self.c_q(x)
|
||||
|
||||
if self.kv_cache:
|
||||
if self.data is None:
|
||||
self.data = self.c_kv(data)
|
||||
|
||||
data = self.data
|
||||
else:
|
||||
data = self.c_kv(data)
|
||||
|
||||
x = self.attention(x, data)
|
||||
x = self.c_proj(x)
|
||||
|
||||
return x
|
||||
|
||||
|
||||
class ResidualCrossAttentionBlock(nn.Module):
|
||||
def __init__(
|
||||
self,
|
||||
width: int,
|
||||
heads: int,
|
||||
n_data: int = None,
|
||||
mlp_expand_ratio: int = 4,
|
||||
qkv_bias: bool = False,
|
||||
norm_layer=nn.LayerNorm,
|
||||
qk_norm: bool = False
|
||||
):
|
||||
super().__init__()
|
||||
|
||||
self.attn = MultiheadCrossAttention(
|
||||
n_data=n_data,
|
||||
width = width,
|
||||
heads=heads,
|
||||
qkv_bias=qkv_bias,
|
||||
norm_layer=norm_layer,
|
||||
qk_norm=qk_norm
|
||||
)
|
||||
|
||||
self.ln_1 = norm_layer(width, elementwise_affine = True, eps = 1e-6)
|
||||
self.ln_2 = norm_layer(width, elementwise_affine = True, eps = 1e-6)
|
||||
self.ln_3 = norm_layer(width, elementwise_affine = True, eps = 1e-6)
|
||||
|
||||
self.mlp = MLP(width=width, ratio = mlp_expand_ratio)
|
||||
|
||||
def forward(self, x: torch.Tensor, data: torch.Tensor):
|
||||
x = x + self.attn(self.ln_1(x), self.ln_2(data))
|
||||
x = x + self.mlp(self.ln_3(x))
|
||||
return x
|
||||
|
||||
class CrossAttentionDecoder(nn.Module):
|
||||
def __init__(
|
||||
self,
|
||||
num_latents: int,
|
||||
out_channels: int,
|
||||
fourier_embedder,
|
||||
width: int,
|
||||
heads: int,
|
||||
mlp_expand_ratio: int = 4,
|
||||
downsample_ratio: int = 1,
|
||||
enable_ln_post: bool = True,
|
||||
qkv_bias: bool = False,
|
||||
qk_norm: bool = False):
|
||||
|
||||
super().__init__()
|
||||
|
||||
self.enable_ln_post = enable_ln_post
|
||||
self.fourier_embedder = fourier_embedder
|
||||
self.downsample_ratio = downsample_ratio
|
||||
|
||||
self.query_proj = nn.Linear(self.fourier_embedder.out_dim, width)
|
||||
|
||||
if self.downsample_ratio != 1:
|
||||
self.latents_proj = nn.Linear(width * downsample_ratio, width)
|
||||
|
||||
if self.enable_ln_post == False:
|
||||
qk_norm = False
|
||||
|
||||
self.cross_attn_decoder = ResidualCrossAttentionBlock(
|
||||
n_data=num_latents,
|
||||
width=width,
|
||||
mlp_expand_ratio=mlp_expand_ratio,
|
||||
heads=heads,
|
||||
qkv_bias=qkv_bias,
|
||||
qk_norm=qk_norm
|
||||
)
|
||||
|
||||
if self.enable_ln_post:
|
||||
self.ln_post = nn.LayerNorm(width)
|
||||
|
||||
self.output_proj = nn.Linear(width, out_channels)
|
||||
self.count = 0
|
||||
|
||||
def forward(self, queries = None, query_embeddings = None, latents = None):
|
||||
|
||||
if query_embeddings is None:
|
||||
query_embeddings = self.query_proj(self.fourier_embedder(queries).to(latents.dtype))
|
||||
|
||||
self.count += query_embeddings.shape[1]
|
||||
|
||||
if self.downsample_ratio != 1:
|
||||
latents = self.latents_proj(latents)
|
||||
|
||||
x = self.cross_attn_decoder(query_embeddings, latents)
|
||||
|
||||
if self.enable_ln_post:
|
||||
x = self.ln_post(x)
|
||||
|
||||
out = self.output_proj(x)
|
||||
|
||||
return out
|
||||
|
||||
|
||||
class PointCrossAttention(nn.Module):
|
||||
def __init__(self,
|
||||
num_latents: int,
|
||||
downsample_ratio: float,
|
||||
pc_size: int,
|
||||
pc_sharpedge_size: int,
|
||||
point_feats: int,
|
||||
width: int,
|
||||
heads: int,
|
||||
layers: int,
|
||||
fourier_embedder,
|
||||
normal_pe: bool = False,
|
||||
qkv_bias: bool = False,
|
||||
use_ln_post: bool = True,
|
||||
qk_norm: bool = True):
|
||||
|
||||
super().__init__()
|
||||
|
||||
self.fourier_embedder = fourier_embedder
|
||||
|
||||
self.pc_size = pc_size
|
||||
self.normal_pe = normal_pe
|
||||
self.downsample_ratio = downsample_ratio
|
||||
self.pc_sharpedge_size = pc_sharpedge_size
|
||||
self.num_latents = num_latents
|
||||
self.point_feats = point_feats
|
||||
|
||||
self.input_proj = nn.Linear(self.fourier_embedder.out_dim + point_feats, width)
|
||||
|
||||
self.cross_attn = ResidualCrossAttentionBlock(
|
||||
width = width,
|
||||
heads = heads,
|
||||
qkv_bias = qkv_bias,
|
||||
qk_norm = qk_norm
|
||||
)
|
||||
|
||||
self.self_attn = None
|
||||
if layers > 0:
|
||||
self.self_attn = Transformer(
|
||||
n_ctx = num_latents,
|
||||
width = width,
|
||||
heads = heads,
|
||||
qkv_bias = qkv_bias,
|
||||
qk_norm = qk_norm,
|
||||
depth = layers
|
||||
)
|
||||
|
||||
if use_ln_post:
|
||||
self.ln_post = nn.LayerNorm(width)
|
||||
else:
|
||||
self.ln_post = None
|
||||
|
||||
def sample_points_and_latents(self, point_cloud: torch.Tensor, features: torch.Tensor):
|
||||
|
||||
"""
|
||||
Subsample points randomly from the point cloud (input_pc)
|
||||
Further sample the subsampled points to get query_pc
|
||||
take the fourier embeddings for both input and query pc
|
||||
|
||||
Mental Note: FPS-sampled points (query_pc) act as latent tokens that attend to and learn from the broader context in input_pc.
|
||||
Goal: get a smaller represenation (query_pc) to represent the entire scence structure by learning from a broader subset (input_pc).
|
||||
More computationally efficient.
|
||||
|
||||
Features are additional information for each point in the cloud
|
||||
"""
|
||||
|
||||
B, _, D = point_cloud.shape
|
||||
|
||||
num_latents = int(self.num_latents)
|
||||
|
||||
num_random_query = self.pc_size / (self.pc_size + self.pc_sharpedge_size) * num_latents
|
||||
num_sharpedge_query = num_latents - num_random_query
|
||||
|
||||
# Split random and sharpedge surface points
|
||||
random_pc, sharpedge_pc = torch.split(point_cloud, [self.pc_size, self.pc_sharpedge_size], dim=1)
|
||||
|
||||
# assert statements
|
||||
assert random_pc.shape[1] <= self.pc_size, "Random surface points size must be less than or equal to pc_size"
|
||||
assert sharpedge_pc.shape[1] <= self.pc_sharpedge_size, "Sharpedge surface points size must be less than or equal to pc_sharpedge_size"
|
||||
|
||||
input_random_pc_size = int(num_random_query * self.downsample_ratio)
|
||||
random_query_pc, random_input_pc, random_idx_pc, random_idx_query = \
|
||||
self.subsample(pc = random_pc, num_query = num_random_query, input_pc_size = input_random_pc_size)
|
||||
|
||||
input_sharpedge_pc_size = int(num_sharpedge_query * self.downsample_ratio)
|
||||
|
||||
if input_sharpedge_pc_size == 0:
|
||||
sharpedge_input_pc = torch.zeros(B, 0, D, dtype = random_input_pc.dtype).to(point_cloud.device)
|
||||
sharpedge_query_pc = torch.zeros(B, 0, D, dtype= random_query_pc.dtype).to(point_cloud.device)
|
||||
|
||||
else: sharpedge_query_pc, sharpedge_input_pc, sharpedge_idx_pc, sharpedge_idx_query = \
|
||||
self.subsample(pc = sharpedge_pc, num_query = num_sharpedge_query, input_pc_size = input_sharpedge_pc_size)
|
||||
|
||||
# concat the random and sharpedges
|
||||
query_pc = torch.cat([random_query_pc, sharpedge_query_pc], dim = 1)
|
||||
input_pc = torch.cat([random_input_pc, sharpedge_input_pc], dim = 1)
|
||||
|
||||
query = self.fourier_embedder(query_pc)
|
||||
data = self.fourier_embedder(input_pc)
|
||||
|
||||
if self.point_feats > 0:
|
||||
random_surface_features, sharpedge_surface_features = torch.split(features, [self.pc_size, self.pc_sharpedge_size], dim = 1)
|
||||
|
||||
input_random_surface_features, query_random_features = \
|
||||
self.handle_features(features = random_surface_features, idx_pc = random_idx_pc, batch_size = B,
|
||||
input_pc_size = input_random_pc_size, idx_query = random_idx_query)
|
||||
|
||||
if input_sharpedge_pc_size == 0:
|
||||
input_sharpedge_surface_features = torch.zeros(B, 0, self.point_feats,
|
||||
dtype = input_random_surface_features.dtype, device = point_cloud.device)
|
||||
|
||||
query_sharpedge_features = torch.zeros(B, 0, self.point_feats,
|
||||
dtype = query_random_features.dtype, device = point_cloud.device)
|
||||
else:
|
||||
|
||||
input_sharpedge_surface_features, query_sharpedge_features = \
|
||||
self.handle_features(idx_pc = sharpedge_idx_pc, features = sharpedge_surface_features,
|
||||
batch_size = B, idx_query = sharpedge_idx_query, input_pc_size = input_sharpedge_pc_size)
|
||||
|
||||
query_features = torch.cat([query_random_features, query_sharpedge_features], dim = 1)
|
||||
input_features = torch.cat([input_random_surface_features, input_sharpedge_surface_features], dim = 1)
|
||||
|
||||
if self.normal_pe:
|
||||
# apply the fourier embeddings on the first 3 dims (xyz)
|
||||
input_features_pe = self.fourier_embedder(input_features[..., :3])
|
||||
query_features_pe = self.fourier_embedder(query_features[..., :3])
|
||||
# replace the first 3 dims with the new PE ones
|
||||
input_features = torch.cat([input_features_pe, input_features[..., :3]], dim = -1)
|
||||
query_features = torch.cat([query_features_pe, query_features[..., :3]], dim = -1)
|
||||
|
||||
# concat at the channels dim
|
||||
query = torch.cat([query, query_features], dim = -1)
|
||||
data = torch.cat([data, input_features], dim = -1)
|
||||
|
||||
# don't return pc_info to avoid unnecessary memory usuage
|
||||
return query.view(B, -1, query.shape[-1]), data.view(B, -1, data.shape[-1])
|
||||
|
||||
def forward(self, point_cloud: torch.Tensor, features: torch.Tensor):
|
||||
|
||||
query, data = self.sample_points_and_latents(point_cloud = point_cloud, features = features)
|
||||
|
||||
# apply projections
|
||||
query = self.input_proj(query)
|
||||
data = self.input_proj(data)
|
||||
|
||||
# apply cross attention between query and data
|
||||
latents = self.cross_attn(query, data)
|
||||
|
||||
if self.self_attn is not None:
|
||||
latents = self.self_attn(latents)
|
||||
|
||||
if self.ln_post is not None:
|
||||
latents = self.ln_post(latents)
|
||||
|
||||
return latents
|
||||
|
||||
|
||||
def subsample(self, pc, num_query, input_pc_size: int):
|
||||
|
||||
"""
|
||||
num_query: number of points to keep after FPS
|
||||
input_pc_size: number of points to select before FPS
|
||||
"""
|
||||
|
||||
B, _, D = pc.shape
|
||||
query_ratio = num_query / input_pc_size
|
||||
|
||||
# random subsampling of points inside the point cloud
|
||||
idx_pc = torch.randperm(pc.shape[1], device = pc.device)[:input_pc_size]
|
||||
input_pc = pc[:, idx_pc, :]
|
||||
|
||||
# flatten to allow applying fps across the whole batch
|
||||
flattent_input_pc = input_pc.view(B * input_pc_size, D)
|
||||
|
||||
# construct a batch_down tensor to tell fps
|
||||
# which points belong to which batch
|
||||
N_down = int(flattent_input_pc.shape[0] / B)
|
||||
batch_down = torch.arange(B).to(pc.device)
|
||||
batch_down = torch.repeat_interleave(batch_down, N_down)
|
||||
|
||||
idx_query = fps(flattent_input_pc, batch_down, sampling_ratio = query_ratio)
|
||||
query_pc = flattent_input_pc[idx_query].view(B, -1, D)
|
||||
|
||||
return query_pc, input_pc, idx_pc, idx_query
|
||||
|
||||
def handle_features(self, features, idx_pc, input_pc_size, batch_size: int, idx_query):
|
||||
|
||||
B = batch_size
|
||||
|
||||
input_surface_features = features[:, idx_pc, :]
|
||||
flattent_input_features = input_surface_features.view(B * input_pc_size, -1)
|
||||
query_features = flattent_input_features[idx_query].view(B, -1,
|
||||
flattent_input_features.shape[-1])
|
||||
|
||||
return input_surface_features, query_features
|
||||
|
||||
def forward(self, pc, feats):
|
||||
"""
|
||||
|
||||
Args:
|
||||
pc (torch.FloatTensor): [B, N, 3]
|
||||
feats (torch.FloatTensor or None): [B, N, C]
|
||||
|
||||
Returns:
|
||||
|
||||
"""
|
||||
|
||||
query, data = self.sample_points_and_latents(pc, feats)
|
||||
|
||||
query = self.input_proj(query)
|
||||
query = query
|
||||
data = self.input_proj(data)
|
||||
data = data
|
||||
|
||||
latents = self.cross_attn(query, data)
|
||||
if self.self_attn is not None:
|
||||
latents = self.self_attn(latents)
|
||||
|
||||
if self.ln_post is not None:
|
||||
latents = self.ln_post(latents)
|
||||
|
||||
return latents
|
||||
def test_point_cross_attention():
|
||||
|
||||
from vae import FourierEmbedder
|
||||
|
||||
torch.manual_seed(2025)
|
||||
B = 2 # batch size
|
||||
D = 3 # point dimension (x, y, z)
|
||||
F = 16 # feature dimension
|
||||
|
||||
pc_random = 96 # number of random surface points
|
||||
pc_sharpedge = 32 # number of sharpedge points
|
||||
total_points = pc_random + pc_sharpedge # = 128
|
||||
|
||||
L = 32 # num_latents (final tokens)
|
||||
downsample_ratio = 2.0 # modest oversampling
|
||||
width = 128
|
||||
heads = 4
|
||||
layers = 2
|
||||
|
||||
|
||||
point_cloud = torch.randn(B, total_points, D)
|
||||
features = torch.randn(B, total_points, F)
|
||||
|
||||
embedder = FourierEmbedder()
|
||||
|
||||
model = PointCrossAttention(
|
||||
num_latents=L,
|
||||
downsample_ratio=downsample_ratio,
|
||||
pc_size=pc_random,
|
||||
pc_sharpedge_size=pc_sharpedge,
|
||||
point_feats=F,
|
||||
width=width,
|
||||
heads=heads,
|
||||
layers=layers,
|
||||
fourier_embedder=embedder,
|
||||
use_ln_post=True,
|
||||
qkv_bias=True,
|
||||
qk_norm=False
|
||||
)
|
||||
|
||||
|
||||
output = model(point_cloud, features)
|
||||
print(output[0])
|
||||
if __name__ == '__main__':
|
||||
test_point_cross_attention()
|
||||
106
comfy/ldm/hunyuan3d/vae/postprocess.py
Normal file
106
comfy/ldm/hunyuan3d/vae/postprocess.py
Normal file
@ -0,0 +1,106 @@
|
||||
import torch
|
||||
from skimage import measure
|
||||
from dataclasses import dataclass
|
||||
import numpy as np
|
||||
|
||||
@dataclass
|
||||
class Latent2MeshOutput():
|
||||
# mesh for vertices and faces
|
||||
mesh_v: None
|
||||
mesh_f: None
|
||||
|
||||
class SufraceExtractor():
|
||||
def compute_box_stat(self, bounds, octree_resolution: int):
|
||||
|
||||
# if float, turn it into a cube
|
||||
if isinstance(bounds, float):
|
||||
bounds = [-bounds, -bounds, -bounds, bounds, bounds, bounds]
|
||||
|
||||
bbox_min, bbox_max = np.array(bounds[0:3]), np.array(bounds[3:6])
|
||||
bbox_size = bbox_max - bbox_min
|
||||
grid_size = [int(octree_resolution) + 1, int(octree_resolution) + 1, int(octree_resolution) + 1]
|
||||
return grid_size, bbox_min, bbox_size
|
||||
|
||||
def run(self, grid_logit, *, bounds, octree_res, **kwargs):
|
||||
# grid_logit from volume decoder
|
||||
# use marching cube algo to turn an sdf to a mesh
|
||||
vertices, faces, _, _ = measure.marching_cubes(grid_logit.cpu().numpy(),
|
||||
0.0,
|
||||
method = "lewiner")
|
||||
|
||||
grid_size, bbox_min, bbox_size = self.compute_box_stat(bounds = bounds, octree_resolution = octree_res)
|
||||
vertices = vertices / grid_size * bbox_size + bbox_min
|
||||
|
||||
return vertices, faces
|
||||
|
||||
def __call__(self, grid_logits, **kwds):
|
||||
|
||||
outputs = []
|
||||
# loop over the batches
|
||||
for i in range(grid_logits.shape[0]):
|
||||
try:
|
||||
# process each batch
|
||||
vertices, faces = self.run(grid_logits[i], **kwds)
|
||||
vertices = vertices.astype(np.float32)
|
||||
faces = np.ascontiguousarray(faces)
|
||||
outputs.append(Latent2MeshOutput(mesh_v = vertices, mesh_f = faces))
|
||||
|
||||
except Exception:
|
||||
import traceback
|
||||
traceback.print_exc()
|
||||
outputs.append(None)
|
||||
|
||||
return outputs
|
||||
|
||||
################################################
|
||||
# Volume Decoder
|
||||
################################################
|
||||
|
||||
class VanillaVolumeDecoder():
|
||||
@torch.no_grad()
|
||||
def __call__(self, latents: torch.Tensor, geo_decoder: callable, octree_res: int, bounds = 1.01,
|
||||
num_chunks: int = 10_000):
|
||||
|
||||
if isinstance(bounds, float):
|
||||
bounds = [-bounds, -bounds, -bounds, bounds, bounds, bounds]
|
||||
|
||||
bbox_min, bbox_max = torch.tensor(bounds[:3]), torch.tensor(bounds[3:])
|
||||
|
||||
x = torch.linspace(bbox_min[0], bbox_max[0], int(octree_res) + 1, dtype = torch.float32)
|
||||
y = torch.linspace(bbox_min[1], bbox_max[1], int(octree_res) + 1, dtype = torch.float32)
|
||||
z = torch.linspace(bbox_min[2], bbox_max[2], int(octree_res) + 1, dtype = torch.float32)
|
||||
|
||||
[xs, ys, zs] = torch.meshgrid(x, y, z, indexing = "ij")
|
||||
xyz = torch.stack((xs, ys, zs), axis=-1).to(latents.device, dtype = latents.dtype).contiguous().reshape(-1, 3)
|
||||
grid_size = [int(octree_res) + 1, int(octree_res) + 1, int(octree_res) + 1]
|
||||
|
||||
batch_logits = []
|
||||
for start in range(0, xyz.shape[0], num_chunks):
|
||||
chunk_queries = xyz[start: start + num_chunks, :]
|
||||
chunk_queries = chunk_queries.unsqueeze(0).repeat(latents.shape[0], 1, 1)
|
||||
logits = geo_decoder(queries = chunk_queries, latents = latents)
|
||||
batch_logits.append(logits)
|
||||
|
||||
grid_logits = torch.cat(batch_logits, dim = 1)
|
||||
grid_logits = grid_logits.view((latents.shape[0], *grid_size)).float()
|
||||
|
||||
return grid_logits
|
||||
|
||||
def export_to_trimesh(mesh_output):
|
||||
import trimesh
|
||||
|
||||
if isinstance(mesh_output, list):
|
||||
outputs = []
|
||||
for mesh in mesh_output:
|
||||
if mesh is None:
|
||||
outputs.append(None)
|
||||
else:
|
||||
mesh.mesh_f = mesh.mesh_f[:, ::-1]
|
||||
mesh_output = trimesh.Trimesh(mesh.mesh_v, mesh.mesh_f)
|
||||
outputs.append(mesh_output)
|
||||
return outputs
|
||||
else:
|
||||
mesh_output.mesh_f = mesh_output.mesh_f[:, ::-1]
|
||||
mesh_output = trimesh.Trimesh(mesh_output.mesh_v, mesh_output.mesh_f)
|
||||
return mesh_output
|
||||
|
||||
165
comfy/ldm/hunyuan3d/vae/preprocess.py
Normal file
165
comfy/ldm/hunyuan3d/vae/preprocess.py
Normal file
@ -0,0 +1,165 @@
|
||||
import trimesh
|
||||
import torch
|
||||
import numpy as np
|
||||
|
||||
def normalize_mesh(mesh, scale = 0.9999):
|
||||
"""Normalize mesh to fit in [-scale, scale]. Translate mesh so its center is [0,0,0]"""
|
||||
|
||||
bbox = mesh.bounds
|
||||
center = (bbox[1] + bbox[0]) / 2
|
||||
|
||||
max_extent = (bbox[1] - bbox[0]).max()
|
||||
mesh.apply_translation(-center)
|
||||
mesh.apply_scale((2 * scale) / max_extent)
|
||||
|
||||
return mesh
|
||||
|
||||
def sample_pointcloud(mesh, num = 200000):
|
||||
""" Uniformly sample points from the surface of the mesh """
|
||||
|
||||
points, face_idx = mesh.sample(num, return_index = True)
|
||||
normals = mesh.face_normals[face_idx]
|
||||
return torch.from_numpy(points.astype(np.float32)), torch.from_numpy(normals.astype(np.float32))
|
||||
|
||||
def detect_sharp_edges(mesh, threshold=0.985):
|
||||
"""Return edge indices (a, b) that lie on sharp boundaries of the mesh."""
|
||||
|
||||
V, F = mesh.vertices, mesh.faces
|
||||
VN, FN = mesh.vertex_normals, mesh.face_normals
|
||||
|
||||
sharp_mask = np.ones(V.shape[0])
|
||||
for i in range(3):
|
||||
indices = F[:, i]
|
||||
alignment = np.einsum('ij,ij->i', VN[indices], FN)
|
||||
dot_stack = np.stack((sharp_mask[indices], alignment), axis=-1)
|
||||
sharp_mask[indices] = np.min(dot_stack, axis=-1)
|
||||
|
||||
edge_a = np.concatenate([F[:, 0], F[:, 1], F[:, 2]])
|
||||
edge_b = np.concatenate([F[:, 1], F[:, 2], F[:, 0]])
|
||||
sharp_edges = (sharp_mask[edge_a] < threshold) & (sharp_mask[edge_b] < threshold)
|
||||
|
||||
return edge_a[sharp_edges], edge_b[sharp_edges]
|
||||
|
||||
|
||||
def sharp_sample_pointcloud(mesh, num = 16384):
|
||||
""" Sample points preferentially from sharp edges in the mesh. """
|
||||
|
||||
edge_a, edge_b = detect_sharp_edges(mesh)
|
||||
V, VN = mesh.vertices, mesh.vertex_normals
|
||||
|
||||
va, vb = V[edge_a], V[edge_b]
|
||||
na, nb = VN[edge_a], VN[edge_b]
|
||||
|
||||
edge_lengths = np.linalg.norm(vb - va, axis=-1)
|
||||
weights = edge_lengths / edge_lengths.sum()
|
||||
|
||||
indices = np.searchsorted(np.cumsum(weights), np.random.rand(num))
|
||||
t = np.random.rand(num, 1)
|
||||
|
||||
samples = t * va[indices] + (1 - t) * vb[indices]
|
||||
normals = t * na[indices] + (1 - t) * nb[indices]
|
||||
|
||||
return samples.astype(np.float32), normals.astype(np.float32)
|
||||
|
||||
def load_surface_sharpedge(mesh, num_points=4096, num_sharp_points=4096, sharpedge_flag = True, device = "cuda"):
|
||||
"""Load a surface with optional sharp-edge annotations from a trimesh mesh."""
|
||||
|
||||
try:
|
||||
mesh_full = trimesh.util.concatenate(mesh.dump())
|
||||
except Exception:
|
||||
mesh_full = trimesh.util.concatenate(mesh)
|
||||
|
||||
mesh_full = normalize_mesh(mesh_full)
|
||||
|
||||
faces = mesh_full.faces
|
||||
vertices = mesh_full.vertices
|
||||
origin_face_count = faces.shape[0]
|
||||
|
||||
mesh_surface = trimesh.Trimesh(vertices=vertices, faces=faces[:origin_face_count])
|
||||
mesh_fill = trimesh.Trimesh(vertices=vertices, faces=faces[origin_face_count:])
|
||||
|
||||
area_surface = mesh_surface.area
|
||||
area_fill = mesh_fill.area
|
||||
total_area = area_surface + area_fill
|
||||
|
||||
sample_num = 499712 // 2
|
||||
fill_ratio = area_fill / total_area if total_area > 0 else 0
|
||||
|
||||
num_fill = int(sample_num * fill_ratio)
|
||||
num_surface = sample_num - num_fill
|
||||
|
||||
surf_pts, surf_normals = sample_pointcloud(mesh_surface, num_surface)
|
||||
fill_pts, fill_normals = (torch.zeros(0, 3), torch.zeros(0, 3)) if num_fill == 0 else sample_pointcloud(mesh_fill, num_fill)
|
||||
|
||||
sharp_pts, sharp_normals = sharp_sample_pointcloud(mesh_surface, sample_num)
|
||||
|
||||
def assemble_tensor(points, normals, label=None):
|
||||
|
||||
data = torch.cat([points, normals], dim=1).half().to(device)
|
||||
|
||||
if label is not None:
|
||||
label_tensor = torch.full((data.shape[0], 1), float(label), dtype=torch.float16).to(device)
|
||||
data = torch.cat([data, label_tensor], dim=1)
|
||||
|
||||
return data
|
||||
|
||||
surface = assemble_tensor(torch.cat([surf_pts.to(device), fill_pts.to(device)], dim=0),
|
||||
torch.cat([surf_normals.to(device), fill_normals.to(device)], dim=0),
|
||||
label = 0 if sharpedge_flag else None)
|
||||
|
||||
sharp_surface = assemble_tensor(torch.from_numpy(sharp_pts), torch.from_numpy(sharp_normals),
|
||||
label = 1 if sharpedge_flag else None)
|
||||
|
||||
rng = np.random.default_rng()
|
||||
|
||||
surface = surface[rng.choice(surface.shape[0], num_points, replace = False)]
|
||||
sharp_surface = sharp_surface[rng.choice(sharp_surface.shape[0], num_sharp_points, replace = False)]
|
||||
|
||||
full = torch.cat([surface, sharp_surface], dim = 0).unsqueeze(0)
|
||||
|
||||
return full
|
||||
|
||||
class SharpEdgeSurfaceLoader:
|
||||
""" Load mesh surface and sharp edge samples. """
|
||||
|
||||
def __init__(self, num_uniform_points = 8192, num_sharp_points = 8192):
|
||||
|
||||
self.num_uniform_points = num_uniform_points
|
||||
self.num_sharp_points = num_sharp_points
|
||||
self.total_points = num_uniform_points + num_sharp_points
|
||||
|
||||
def __call__(self, mesh_input, device = "cuda"):
|
||||
mesh = self._load_mesh(mesh_input)
|
||||
return load_surface_sharpedge(mesh, self.num_uniform_points, self.num_sharp_points, device = device)
|
||||
|
||||
@staticmethod
|
||||
def _load_mesh(mesh_input):
|
||||
|
||||
if isinstance(mesh_input, str):
|
||||
mesh = trimesh.load(mesh_input, force="mesh", merge_primitives = True)
|
||||
else:
|
||||
mesh = mesh_input
|
||||
|
||||
if isinstance(mesh, trimesh.Scene):
|
||||
combined = None
|
||||
for obj in mesh.geometry.values():
|
||||
combined = obj if combined is None else combined + obj
|
||||
return combined
|
||||
|
||||
return mesh
|
||||
|
||||
def test_preprocess():
|
||||
torch.set_default_device("cpu")
|
||||
torch.manual_seed(2025)
|
||||
np.random.seed(2025)
|
||||
loader = SharpEdgeSurfaceLoader(
|
||||
num_sharp_points = 0,
|
||||
num_uniform_points = 81920,
|
||||
)
|
||||
|
||||
mesh_demo = 'rock.glb'
|
||||
surface = loader(mesh_demo, device = "cpu").to(dtype = torch.float16)
|
||||
print(surface)
|
||||
|
||||
if __name__ == "__main__":
|
||||
test_preprocess()
|
||||
156
comfy/ldm/hunyuan3d/vae/transformer.py
Normal file
156
comfy/ldm/hunyuan3d/vae/transformer.py
Normal file
@ -0,0 +1,156 @@
|
||||
import torch
|
||||
import torch.nn as nn
|
||||
import torch.nn.functional as F
|
||||
|
||||
class DropPath(nn.Module):
|
||||
"""Drop paths (Stochastic Depth) per sample (when applied in main path of residual blocks).
|
||||
"""
|
||||
|
||||
def __init__(self, drop_prob: float = 0., scale_by_keep: bool = True):
|
||||
super(DropPath, self).__init__()
|
||||
self.drop_prob = drop_prob
|
||||
self.scale_by_keep = scale_by_keep
|
||||
|
||||
def forward(self, x):
|
||||
|
||||
keep_prob = 1 - self.drop_prob
|
||||
shape = (x.shape[0],) + (1,) * (x.ndim - 1) # work with diff dim tensors, not just 2D ConvNets
|
||||
|
||||
random_tensor = x.new_empty(shape).bernoulli_(keep_prob)
|
||||
|
||||
if keep_prob > 0.0 and self.scale_by_keep:
|
||||
random_tensor.div_(keep_prob)
|
||||
|
||||
return x * random_tensor
|
||||
|
||||
class MLP(nn.Module):
|
||||
def __init__(self, width: int, ratio: int = 4, drop_path_rate: float = 0):
|
||||
super().__init__()
|
||||
self.gelu = nn.GELU()
|
||||
self.c_fc = nn.Linear(width, width * ratio)
|
||||
self.c_proj = nn.Linear(width * ratio, width)
|
||||
self.drop_path = DropPath(drop_path_rate) if drop_path_rate > 0. else nn.Identity()
|
||||
|
||||
def forward(self, x):
|
||||
return self.drop_path(self.c_proj(self.gelu(self.c_fc(x))))
|
||||
|
||||
|
||||
class QKVMultiheadAttention(nn.Module):
|
||||
def __init__(
|
||||
self,
|
||||
heads: int,
|
||||
n_ctx: int,
|
||||
width=None,
|
||||
qk_norm=False,
|
||||
norm_layer=nn.LayerNorm
|
||||
):
|
||||
super().__init__()
|
||||
self.heads = heads
|
||||
self.n_ctx = n_ctx
|
||||
self.q_norm = norm_layer(width // heads, elementwise_affine=True, eps=1e-6) if qk_norm else nn.Identity()
|
||||
self.k_norm = norm_layer(width // heads, elementwise_affine=True, eps=1e-6) if qk_norm else nn.Identity()
|
||||
|
||||
def forward(self, qkv):
|
||||
bs, n_ctx, width = qkv.shape
|
||||
attn_ch = width // self.heads // 3
|
||||
qkv = qkv.view(bs, n_ctx, self.heads, -1)
|
||||
q, k, v = torch.split(qkv, attn_ch, dim=-1)
|
||||
|
||||
q = self.q_norm(q)
|
||||
k = self.k_norm(k)
|
||||
|
||||
q, k, v = [t.permute(0, 2, 1, 3) for t in (q, k, v)]
|
||||
out = F.scaled_dot_product_attention(q, k, v).transpose(1, 2).reshape(bs, n_ctx, -1)
|
||||
return out
|
||||
|
||||
|
||||
class MultiheadAttention(nn.Module):
|
||||
def __init__(
|
||||
self,
|
||||
n_ctx: int,
|
||||
width: int,
|
||||
heads: int,
|
||||
qkv_bias: bool,
|
||||
norm_layer = nn.LayerNorm,
|
||||
qk_norm: bool = False,
|
||||
drop_path_rate: float = 0.0
|
||||
):
|
||||
super().__init__()
|
||||
|
||||
self.c_qkv = nn.Linear(width, width * 3, bias=qkv_bias)
|
||||
self.c_proj = nn.Linear(width, width)
|
||||
|
||||
self.attention = QKVMultiheadAttention(
|
||||
heads = heads,
|
||||
n_ctx = n_ctx,
|
||||
width = width,
|
||||
norm_layer = norm_layer,
|
||||
qk_norm = qk_norm
|
||||
)
|
||||
self.drop_path = DropPath(drop_path_rate) if drop_path_rate > 0. else nn.Identity()
|
||||
|
||||
def forward(self, x):
|
||||
x = self.c_qkv(x)
|
||||
x = self.attention(x)
|
||||
x = self.drop_path(self.c_proj(x))
|
||||
return x
|
||||
|
||||
|
||||
class ResAttnBlock(nn.Module):
|
||||
def __init__(
|
||||
self,
|
||||
*,
|
||||
n_ctx: int,
|
||||
width: int,
|
||||
heads: int,
|
||||
qkv_bias: bool = True,
|
||||
norm_layer=nn.LayerNorm,
|
||||
qk_norm: bool = False,
|
||||
drop_path_rate: float = 0.0,
|
||||
):
|
||||
super().__init__()
|
||||
self.attn = MultiheadAttention(
|
||||
n_ctx=n_ctx,
|
||||
width=width,
|
||||
heads=heads,
|
||||
qkv_bias=qkv_bias,
|
||||
norm_layer=norm_layer,
|
||||
qk_norm=qk_norm,
|
||||
drop_path_rate=drop_path_rate
|
||||
)
|
||||
self.ln_1 = norm_layer(width, elementwise_affine=True, eps=1e-6)
|
||||
self.mlp = MLP(width=width, drop_path_rate=drop_path_rate)
|
||||
self.ln_2 = norm_layer(width, elementwise_affine=True, eps=1e-6)
|
||||
|
||||
def forward(self, x: torch.Tensor):
|
||||
x = x + self.attn(self.ln_1(x))
|
||||
x = x + self.mlp(self.ln_2(x))
|
||||
return x
|
||||
|
||||
class Transformer(nn.Module):
|
||||
def __init__(self, n_ctx: int, heads: int, width: int, depth: int,
|
||||
qkv_bias: bool = True, qk_norm: bool = False, drop_path_rate: float = 0.0):
|
||||
super().__init__()
|
||||
|
||||
self.resblocks = nn.ModuleList([
|
||||
ResAttnBlock(n_ctx = n_ctx,
|
||||
heads = heads,
|
||||
width = width,
|
||||
qkv_bias = qkv_bias,
|
||||
qk_norm = qk_norm,
|
||||
drop_path_rate = drop_path_rate)
|
||||
for _ in range(depth)
|
||||
])
|
||||
|
||||
def forward(self, x: torch.Tensor) -> torch.Tensor:
|
||||
|
||||
for resnet in self.resblocks:
|
||||
x = resnet(x)
|
||||
|
||||
return x
|
||||
|
||||
if __name__ == "__main__":
|
||||
torch.manual_seed(2025)
|
||||
model = Transformer(512, 8, 224, 3)
|
||||
outputs = model(x = torch.randn(1, 512, 224))
|
||||
print(outputs)
|
||||
181
comfy/ldm/hunyuan3d/vae/vae.py
Normal file
181
comfy/ldm/hunyuan3d/vae/vae.py
Normal file
@ -0,0 +1,181 @@
|
||||
import torch
|
||||
import torch.nn as nn
|
||||
from transformer import Transformer
|
||||
from postprocess import VanillaVolumeDecoder, SufraceExtractor
|
||||
from point_attention import PointCrossAttention, CrossAttentionDecoder
|
||||
|
||||
class FourierEmbedder(nn.Module):
|
||||
def __init__(self, num_freq: int = 8, input_dim: int = 3, include_pi: bool = False):
|
||||
super().__init__()
|
||||
|
||||
frequencies = 2.0 ** torch.arange(
|
||||
num_freq,
|
||||
dtype = torch.float32
|
||||
)
|
||||
|
||||
if include_pi:
|
||||
frequencies *= torch.pi
|
||||
|
||||
self.register_buffer("frequencies", frequencies, persistent = False)
|
||||
|
||||
self.out_dim = input_dim * (num_freq * 2 + 1)
|
||||
|
||||
def forward(self, x: torch.Tensor) -> torch.Tensor:
|
||||
|
||||
embed = (x[..., None].contiguous() * self.frequencies).view(*x.shape[:-1], -1)
|
||||
return torch.cat((x, embed.sin(), embed.cos()), dim = -1)
|
||||
|
||||
class DiagonalGaussianDistribution:
|
||||
def __init__(self, params: torch.Tensor, feature_dim: int = -1):
|
||||
|
||||
# divide quant channels (8) into mean and log variance
|
||||
self.mean, self.logvar = torch.chunk(params, 2, dim = feature_dim)
|
||||
|
||||
self.logvar = torch.clamp(self.logvar, -30.0, 20.0)
|
||||
self.std = torch.exp(0.5 * self.logvar)
|
||||
|
||||
def sample(self):
|
||||
|
||||
eps = torch.randn_like(self.std)
|
||||
z = self.mean + eps * self.std
|
||||
|
||||
return z
|
||||
|
||||
class VAE(nn.Module):
|
||||
def __init__(self,
|
||||
*,
|
||||
num_latents: int = 4096,
|
||||
embed_dim: int = 64,
|
||||
width: int = 1024,
|
||||
heads: int = 16,
|
||||
num_decoder_layers: int = 16,
|
||||
num_encoder_layers: int = 8,
|
||||
pc_size: int = 81920,
|
||||
pc_sharpedge_size: int = 0,
|
||||
point_feats: int = 4,
|
||||
downsample_ratio: int = 20,
|
||||
geo_decoder_downsample_ratio: int = 1,
|
||||
geo_decoder_mlp_expand_ratio: int = 4,
|
||||
geo_decoder_ln_post: bool = True,
|
||||
num_frequencies: int = 8,
|
||||
qkv_bias: bool = False,
|
||||
qk_norm: bool = True,
|
||||
drop_path_rate: float = 0.0,
|
||||
include_pi: bool = False
|
||||
):
|
||||
|
||||
super().__init__()
|
||||
|
||||
self.fourier_embedder = FourierEmbedder(num_freq = num_frequencies, include_pi = include_pi)
|
||||
|
||||
self.encoder = PointCrossAttention(layers = num_encoder_layers,
|
||||
num_latents = num_latents,
|
||||
downsample_ratio = downsample_ratio,
|
||||
heads = heads,
|
||||
pc_size = pc_size,
|
||||
width = width,
|
||||
point_feats = point_feats,
|
||||
fourier_embedder = self.fourier_embedder,
|
||||
pc_sharpedge_size = pc_sharpedge_size)
|
||||
|
||||
self.transformer = Transformer(
|
||||
n_ctx=num_latents,
|
||||
width=width,
|
||||
depth=num_decoder_layers,
|
||||
heads=heads,
|
||||
qkv_bias=qkv_bias,
|
||||
qk_norm=qk_norm,
|
||||
drop_path_rate=drop_path_rate
|
||||
)
|
||||
|
||||
self.geo_decoder = CrossAttentionDecoder(
|
||||
fourier_embedder = self.fourier_embedder,
|
||||
out_channels = 1,
|
||||
num_latents = num_latents,
|
||||
mlp_expand_ratio = geo_decoder_mlp_expand_ratio,
|
||||
downsample_ratio = geo_decoder_downsample_ratio,
|
||||
enable_ln_post = geo_decoder_ln_post,
|
||||
width=width // geo_decoder_downsample_ratio,
|
||||
heads=heads // geo_decoder_downsample_ratio,
|
||||
qkv_bias = qkv_bias,
|
||||
qk_norm= qk_norm
|
||||
)
|
||||
|
||||
self.pre_kl = nn.Linear(width, embed_dim * 2)
|
||||
self.post_kl = nn.Linear(embed_dim, width)
|
||||
|
||||
self.volume_decoder = VanillaVolumeDecoder()
|
||||
self.surface_extractor = SufraceExtractor()
|
||||
|
||||
|
||||
def forward(self):
|
||||
pass
|
||||
|
||||
def encode(self, surface):
|
||||
|
||||
pc, feats = surface[:, :, :3], surface[:, :, 3:]
|
||||
latents = self.encoder(pc, feats)
|
||||
|
||||
moments = self.pre_kl(latents)
|
||||
posterior = DiagonalGaussianDistribution(moments, feature_dim = -1)
|
||||
|
||||
latents = posterior.sample()
|
||||
|
||||
return latents
|
||||
|
||||
def decode(self, latents, to_mesh: bool = True, **kwargs):
|
||||
|
||||
latents = self.post_kl(latents)
|
||||
latents = self.transformer(latents)
|
||||
|
||||
if not to_mesh:
|
||||
return latents
|
||||
|
||||
grid_logits = self.volume_decoder(latents = latents, geo_decoder = self.geo_decoder, **kwargs)
|
||||
mesh = self.surface_extractor(grid_logits, **kwargs)
|
||||
|
||||
return mesh
|
||||
|
||||
def load_vae(vae):
|
||||
|
||||
DEBUG = False
|
||||
|
||||
checkpoint = "model.fp16.ckpt"
|
||||
missing, unexpected = vae.load_state_dict(torch.load(checkpoint), strict = not DEBUG)
|
||||
|
||||
if DEBUG:
|
||||
print(f"Missing {len(missing)}: ", missing)
|
||||
print(f"\nUnexpected {len(unexpected)}: ", unexpected)
|
||||
|
||||
return vae
|
||||
|
||||
def test_vae():
|
||||
|
||||
torch.manual_seed(2025)
|
||||
vae = VAE()
|
||||
vae = load_vae(vae)
|
||||
|
||||
from preprocess import SharpEdgeSurfaceLoader
|
||||
from postprocess import export_to_trimesh
|
||||
|
||||
loader = SharpEdgeSurfaceLoader(
|
||||
num_sharp_points = 0,
|
||||
num_uniform_points = 81920,
|
||||
)
|
||||
|
||||
mesh_demo = 'Duck.glb'
|
||||
surface = loader(mesh_demo).to(dtype = torch.float16)
|
||||
|
||||
latents = vae.encode(surface)
|
||||
|
||||
mesh = vae.decode(latents,
|
||||
num_chunks = 20000,
|
||||
octree_res = 256,
|
||||
to_mesh = True)
|
||||
|
||||
mesh = export_to_trimesh(mesh)[0]
|
||||
|
||||
mesh.export("duck_recreated.glb")
|
||||
|
||||
if __name__ == "__main__":
|
||||
test_vae()
|
||||
Loading…
x
Reference in New Issue
Block a user