Upload folder using huggingface_hub
Browse files- .gitattributes +12 -0
- ckpt_0.pt +3 -0
- simplefsq32.py +682 -0
.gitattributes
CHANGED
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@@ -33,3 +33,15 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
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*.zip filter=lfs diff=lfs merge=lfs -text
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| 34 |
*.zst filter=lfs diff=lfs merge=lfs -text
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*tfevents* filter=lfs diff=lfs merge=lfs -text
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*.zip filter=lfs diff=lfs merge=lfs -text
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*.zst filter=lfs diff=lfs merge=lfs -text
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*tfevents* filter=lfs diff=lfs merge=lfs -text
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samples/10000.jpg filter=lfs diff=lfs merge=lfs -text
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samples/10500.jpg filter=lfs diff=lfs merge=lfs -text
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samples/11000.jpg filter=lfs diff=lfs merge=lfs -text
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samples/11500.jpg filter=lfs diff=lfs merge=lfs -text
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samples/12000.jpg filter=lfs diff=lfs merge=lfs -text
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samples/12500.jpg filter=lfs diff=lfs merge=lfs -text
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samples/13000.jpg filter=lfs diff=lfs merge=lfs -text
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samples/7500.jpg filter=lfs diff=lfs merge=lfs -text
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samples/8000.jpg filter=lfs diff=lfs merge=lfs -text
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samples/8500.jpg filter=lfs diff=lfs merge=lfs -text
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samples/9000.jpg filter=lfs diff=lfs merge=lfs -text
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samples/9500.jpg filter=lfs diff=lfs merge=lfs -text
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ckpt_0.pt
ADDED
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@@ -0,0 +1,3 @@
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| 1 |
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version https://git-lfs.github.com/spec/v1
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oid sha256:dded894389248d371d9ad72ea2bf90e7a5677fc5ec3801e594eeeec200512993
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+
size 202217053
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simplefsq32.py
ADDED
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@@ -0,0 +1,682 @@
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| 1 |
+
"""
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| 2 |
+
最简 FSQ 训练 Demo(支持分桶 Bucketing)
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| 3 |
+
单文件,自包含,可直接运行。
|
| 4 |
+
|
| 5 |
+
依赖:
|
| 6 |
+
pip install torch torchvision einops
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| 7 |
+
|
| 8 |
+
运行:
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| 9 |
+
# 用不同分辨率的 dummy 图片测试分桶
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| 10 |
+
python fsq_demo.py --dummy --epochs 2
|
| 11 |
+
|
| 12 |
+
# 用真实 WebP 文件夹
|
| 13 |
+
python fsq_demo.py --data /path/to/webp_folder --epochs 10
|
| 14 |
+
"""
|
| 15 |
+
|
| 16 |
+
import argparse
|
| 17 |
+
import os
|
| 18 |
+
import math
|
| 19 |
+
import glob
|
| 20 |
+
import random
|
| 21 |
+
from typing import List
|
| 22 |
+
|
| 23 |
+
import torch
|
| 24 |
+
import torch.nn as nn
|
| 25 |
+
import torch.nn.functional as F
|
| 26 |
+
from torch.utils.data import DataLoader, Dataset, Sampler
|
| 27 |
+
from torchvision import transforms
|
| 28 |
+
from torchvision.utils import save_image, make_grid
|
| 29 |
+
from PIL import Image
|
| 30 |
+
from einops import rearrange, pack, unpack
|
| 31 |
+
|
| 32 |
+
import json
|
| 33 |
+
from concurrent.futures import ThreadPoolExecutor
|
| 34 |
+
# ============================================================
|
| 35 |
+
# 1. FSQ 量化器
|
| 36 |
+
# ============================================================
|
| 37 |
+
|
| 38 |
+
def round_ste(z: torch.Tensor) -> torch.Tensor:
|
| 39 |
+
"""取整 + 直通梯度估计(Straight-Through Estimator)"""
|
| 40 |
+
zhat = z.round()
|
| 41 |
+
return z + (zhat - z).detach()
|
| 42 |
+
|
| 43 |
+
|
| 44 |
+
def pack_one(t, pattern):
|
| 45 |
+
return pack([t], pattern)
|
| 46 |
+
|
| 47 |
+
|
| 48 |
+
def unpack_one(t, ps, pattern):
|
| 49 |
+
return unpack(t, ps, pattern)[0]
|
| 50 |
+
|
| 51 |
+
|
| 52 |
+
class FSQ(nn.Module):
|
| 53 |
+
"""Finite Scalar Quantization,来自 https://arxiv.org/abs/2309.15505"""
|
| 54 |
+
|
| 55 |
+
def __init__(self, levels: List[int]):
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| 56 |
+
super().__init__()
|
| 57 |
+
_levels = torch.tensor(levels, dtype=torch.int32)
|
| 58 |
+
self.register_buffer("_levels", _levels, persistent=False)
|
| 59 |
+
|
| 60 |
+
_basis = torch.cumprod(torch.tensor([1] + levels[:-1]), dim=0, dtype=torch.int32)
|
| 61 |
+
self.register_buffer("_basis", _basis, persistent=False)
|
| 62 |
+
|
| 63 |
+
self.codebook_dim = len(levels)
|
| 64 |
+
self.codebook_size = int(_levels.prod().item())
|
| 65 |
+
|
| 66 |
+
def bound(self, z: torch.Tensor, eps: float = 1e-3) -> torch.Tensor:
|
| 67 |
+
half_l = (self._levels - 1) * (1 - eps) / 2
|
| 68 |
+
offset = torch.where(self._levels % 2 == 0, 0.5, 0.0)
|
| 69 |
+
shift = (offset / half_l).tan()
|
| 70 |
+
return (z + shift).tanh() * half_l - offset
|
| 71 |
+
|
| 72 |
+
def quantize(self, z: torch.Tensor) -> torch.Tensor:
|
| 73 |
+
quantized = round_ste(self.bound(z))
|
| 74 |
+
half_width = self._levels // 2
|
| 75 |
+
return quantized / half_width
|
| 76 |
+
|
| 77 |
+
def _scale_and_shift(self, zhat_normalized):
|
| 78 |
+
half_width = self._levels // 2
|
| 79 |
+
return (zhat_normalized * half_width) + half_width
|
| 80 |
+
|
| 81 |
+
def _scale_and_shift_inverse(self, zhat):
|
| 82 |
+
half_width = self._levels // 2
|
| 83 |
+
return (zhat - half_width) / half_width
|
| 84 |
+
|
| 85 |
+
def codes_to_indices(self, zhat: torch.Tensor) -> torch.Tensor:
|
| 86 |
+
assert zhat.shape[-1] == self.codebook_dim
|
| 87 |
+
zhat = self._scale_and_shift(zhat)
|
| 88 |
+
return (zhat * self._basis).sum(dim=-1).to(torch.int32)
|
| 89 |
+
|
| 90 |
+
def indices_to_codes(self, indices: torch.Tensor) -> torch.Tensor:
|
| 91 |
+
indices = rearrange(indices, '... -> ... 1')
|
| 92 |
+
codes_non_centered = (indices // self._basis) % self._levels
|
| 93 |
+
codes = self._scale_and_shift_inverse(codes_non_centered)
|
| 94 |
+
return codes
|
| 95 |
+
|
| 96 |
+
def forward(self, z: torch.Tensor):
|
| 97 |
+
is_img = z.ndim >= 4
|
| 98 |
+
if is_img:
|
| 99 |
+
z = rearrange(z, 'b d ... -> b ... d')
|
| 100 |
+
z, ps = pack_one(z, 'b * d')
|
| 101 |
+
|
| 102 |
+
assert z.shape[-1] == self.codebook_dim
|
| 103 |
+
|
| 104 |
+
codes = self.quantize(z)
|
| 105 |
+
indices = self.codes_to_indices(codes)
|
| 106 |
+
|
| 107 |
+
if is_img:
|
| 108 |
+
codes = unpack_one(codes, ps, 'b * d')
|
| 109 |
+
codes = rearrange(codes, 'b ... d -> b d ...')
|
| 110 |
+
indices = unpack_one(indices, ps, 'b *')
|
| 111 |
+
|
| 112 |
+
return codes, indices
|
| 113 |
+
|
| 114 |
+
|
| 115 |
+
# ============================================================
|
| 116 |
+
# 2. Encoder / Decoder(16× 下采样,即 4 层 stride=2)
|
| 117 |
+
# ============================================================
|
| 118 |
+
|
| 119 |
+
class Encoder(nn.Module):
|
| 120 |
+
def __init__(self, in_channel=3, channel=128, embed_dim=4):
|
| 121 |
+
super().__init__()
|
| 122 |
+
self.net = nn.Sequential(
|
| 123 |
+
nn.Conv2d(in_channel, channel, 4, stride=2, padding=1), # 256→128
|
| 124 |
+
nn.ReLU(inplace=True),
|
| 125 |
+
nn.Conv2d(channel, channel, 4, stride=2, padding=1), # 128→64
|
| 126 |
+
nn.ReLU(inplace=True),
|
| 127 |
+
nn.Conv2d(channel, channel, 4, stride=2, padding=1), # 64→32
|
| 128 |
+
nn.ReLU(inplace=True),
|
| 129 |
+
nn.Conv2d(channel, channel, 4, stride=2, padding=1), # 32→16
|
| 130 |
+
nn.ReLU(inplace=True),
|
| 131 |
+
#nn.Conv2d(channel, channel, 4, stride=2, padding=1), # 16→8
|
| 132 |
+
#nn.ReLU(inplace=True),
|
| 133 |
+
nn.Conv2d(channel, embed_dim, 1),
|
| 134 |
+
)
|
| 135 |
+
|
| 136 |
+
def forward(self, x):
|
| 137 |
+
return self.net(x)
|
| 138 |
+
|
| 139 |
+
|
| 140 |
+
class Decoder(nn.Module):
|
| 141 |
+
def __init__(self, embed_dim=4, channel=128, out_channel=3):
|
| 142 |
+
super().__init__()
|
| 143 |
+
self.net = nn.Sequential(
|
| 144 |
+
nn.ConvTranspose2d(embed_dim, channel, 4, stride=2, padding=1), # 8→16
|
| 145 |
+
#nn.ReLU(inplace=True),
|
| 146 |
+
#nn.ConvTranspose2d(channel, channel, 4, stride=2, padding=1), # 16→32
|
| 147 |
+
nn.ReLU(inplace=True),
|
| 148 |
+
nn.ConvTranspose2d(channel, channel, 4, stride=2, padding=1), # 32→64
|
| 149 |
+
nn.ReLU(inplace=True),
|
| 150 |
+
nn.ConvTranspose2d(channel, channel, 4, stride=2, padding=1), # 64→128
|
| 151 |
+
nn.ReLU(inplace=True),
|
| 152 |
+
nn.ConvTranspose2d(channel, channel, 4, stride=2, padding=1), # 128→256
|
| 153 |
+
nn.ReLU(inplace=True),
|
| 154 |
+
nn.Conv2d(channel, out_channel, 1),
|
| 155 |
+
)
|
| 156 |
+
|
| 157 |
+
def forward(self, x):
|
| 158 |
+
return self.net(x)
|
| 159 |
+
|
| 160 |
+
|
| 161 |
+
# ============================================================
|
| 162 |
+
# 3. VQVAE (FSQ 版)
|
| 163 |
+
# ============================================================
|
| 164 |
+
|
| 165 |
+
class FSQVAE(nn.Module):
|
| 166 |
+
def __init__(self, levels: List[int], channel=128, in_channel=3):
|
| 167 |
+
super().__init__()
|
| 168 |
+
embed_dim = len(levels)
|
| 169 |
+
self.encoder = Encoder(in_channel, channel, embed_dim)
|
| 170 |
+
self.quantizer = FSQ(levels)
|
| 171 |
+
self.decoder = Decoder(embed_dim, channel, in_channel)
|
| 172 |
+
|
| 173 |
+
def forward(self, x, return_id=False):
|
| 174 |
+
z = self.encoder(x)
|
| 175 |
+
quant, indices = self.quantizer(z)
|
| 176 |
+
recon = self.decoder(quant)
|
| 177 |
+
if return_id:
|
| 178 |
+
return recon, indices
|
| 179 |
+
return recon
|
| 180 |
+
|
| 181 |
+
@torch.no_grad()
|
| 182 |
+
def encode(self, x):
|
| 183 |
+
z = self.encoder(x)
|
| 184 |
+
_, indices = self.quantizer(z)
|
| 185 |
+
return indices
|
| 186 |
+
|
| 187 |
+
@torch.no_grad()
|
| 188 |
+
def decode_code(self, indices):
|
| 189 |
+
codes = self.quantizer.indices_to_codes(indices)
|
| 190 |
+
codes = rearrange(codes, 'b h w d -> b d h w')
|
| 191 |
+
return self.decoder(codes)
|
| 192 |
+
|
| 193 |
+
|
| 194 |
+
# ============================================================
|
| 195 |
+
# 4. 分桶(Bucketing)
|
| 196 |
+
# ============================================================
|
| 197 |
+
|
| 198 |
+
def make_buckets(base=256, align=16):
|
| 199 |
+
"""
|
| 200 |
+
生成一组总像素数接近 base² 的桶,宽高比覆盖常见情况。
|
| 201 |
+
每个桶的 H、W 都是 align 的倍数(方便下采样 16×)。
|
| 202 |
+
"""
|
| 203 |
+
aspect_ratios = [0.65, 0.68, 0.72, 0.75, 0.80, 1.0, 1.33, 1.45, 1.78]
|
| 204 |
+
buckets = set()
|
| 205 |
+
for ar in aspect_ratios:
|
| 206 |
+
h = int(round(math.sqrt(base * base * ar)))
|
| 207 |
+
w = int(round(math.sqrt(base * base / ar)))
|
| 208 |
+
h = max(align, h // align * align)
|
| 209 |
+
w = max(align, w // align * align)
|
| 210 |
+
buckets.add((h, w))
|
| 211 |
+
return sorted(buckets)
|
| 212 |
+
|
| 213 |
+
|
| 214 |
+
def find_bucket(w, h, buckets):
|
| 215 |
+
"""
|
| 216 |
+
选裁剪面积最小的桶。
|
| 217 |
+
"""
|
| 218 |
+
best, best_loss = None, float('inf')
|
| 219 |
+
for (bh, bw) in buckets:
|
| 220 |
+
scale = max(bw / w, bh / h)
|
| 221 |
+
new_w = math.ceil(w * scale)
|
| 222 |
+
new_h = math.ceil(h * scale)
|
| 223 |
+
# 裁剪掉的面积比例
|
| 224 |
+
crop_loss = 1 - (bw * bh) / (new_w * new_h)
|
| 225 |
+
if crop_loss < best_loss:
|
| 226 |
+
best_loss, best = crop_loss, (bh, bw)
|
| 227 |
+
return best
|
| 228 |
+
|
| 229 |
+
|
| 230 |
+
class BucketImageFolder(Dataset):
|
| 231 |
+
def __init__(self, root, buckets, recursive=True,
|
| 232 |
+
num_threads=2, cache_file="./sizes_cache.json"):
|
| 233 |
+
self.buckets = buckets
|
| 234 |
+
exts = ('*.webp', '*.jpg', '*.jpeg', '*.png', '*.bmp')
|
| 235 |
+
self.files = []
|
| 236 |
+
for ext in exts:
|
| 237 |
+
pattern = f"**/{ext}" if recursive else ext
|
| 238 |
+
self.files += glob.glob(os.path.join(root, pattern), recursive=recursive)
|
| 239 |
+
self.files = sorted(self.files)
|
| 240 |
+
if len(self.files) == 0:
|
| 241 |
+
raise RuntimeError(f"在 {root} 下没找到任何图片")
|
| 242 |
+
|
| 243 |
+
print(f"找到 {len(self.files)} 张图片")
|
| 244 |
+
|
| 245 |
+
# 扫描尺寸(多线程 + JSON 缓存)
|
| 246 |
+
sizes = self._scan_sizes(num_threads, cache_file)
|
| 247 |
+
|
| 248 |
+
# 分桶
|
| 249 |
+
self.bucket_map = {b: [] for b in buckets}
|
| 250 |
+
self.idx_to_bucket = {}
|
| 251 |
+
for idx, f in enumerate(self.files):
|
| 252 |
+
if f not in sizes:
|
| 253 |
+
continue
|
| 254 |
+
w, h = sizes[f]
|
| 255 |
+
b = find_bucket(w, h, buckets)
|
| 256 |
+
self.bucket_map[b].append(idx)
|
| 257 |
+
self.idx_to_bucket[idx] = b
|
| 258 |
+
|
| 259 |
+
# 打印桶分布
|
| 260 |
+
for b, idxs in self.bucket_map.items():
|
| 261 |
+
print(f" 桶 {b}: {len(idxs)} 张")
|
| 262 |
+
|
| 263 |
+
self.normalize = transforms.Normalize([0.5, 0.5, 0.5], [0.5, 0.5, 0.5])
|
| 264 |
+
|
| 265 |
+
def _scan_sizes(self, num_threads, cache_file):
|
| 266 |
+
# 1. 尝试从缓存加载
|
| 267 |
+
if cache_file and os.path.exists(cache_file):
|
| 268 |
+
print(f"从缓存加载尺寸: {cache_file}")
|
| 269 |
+
with open(cache_file) as f:
|
| 270 |
+
cache = json.load(f)
|
| 271 |
+
if set(cache.keys()) == set(self.files):
|
| 272 |
+
print(f"缓存有效,{len(cache)} 个尺寸")
|
| 273 |
+
return {f: tuple(s) for f, s in cache.items()}
|
| 274 |
+
print("缓存失效,重新扫描")
|
| 275 |
+
|
| 276 |
+
# 2. 多线程扫描
|
| 277 |
+
print(f"多线程扫描 {len(self.files)} 张图({num_threads} 线程)...")
|
| 278 |
+
|
| 279 |
+
def get_size(f):
|
| 280 |
+
try:
|
| 281 |
+
with Image.open(f) as im:
|
| 282 |
+
return f, im.size
|
| 283 |
+
except Exception:
|
| 284 |
+
return f, None
|
| 285 |
+
|
| 286 |
+
with ThreadPoolExecutor(num_threads) as ex:
|
| 287 |
+
results = list(ex.map(get_size, self.files))
|
| 288 |
+
|
| 289 |
+
sizes = {f: s for f, s in results if s is not None}
|
| 290 |
+
print(f"扫描完成: {len(sizes)} 张成功")
|
| 291 |
+
|
| 292 |
+
# 3. 保存缓存
|
| 293 |
+
if cache_file:
|
| 294 |
+
print(f"保存缓存: {cache_file}")
|
| 295 |
+
with open(cache_file, "w") as f:
|
| 296 |
+
json.dump({f: list(s) for f, s in sizes.items()}, f)
|
| 297 |
+
print(f"缓存已保存")
|
| 298 |
+
|
| 299 |
+
return sizes
|
| 300 |
+
|
| 301 |
+
def __len__(self):
|
| 302 |
+
return len(self.files)
|
| 303 |
+
|
| 304 |
+
def __getitem__(self, idx):
|
| 305 |
+
f = self.files[idx]
|
| 306 |
+
bh, bw = self.idx_to_bucket.get(idx, (256, 256))
|
| 307 |
+
try:
|
| 308 |
+
img = Image.open(f)
|
| 309 |
+
if getattr(img, "is_animated", False):
|
| 310 |
+
img.seek(0)
|
| 311 |
+
img = img.convert("RGB")
|
| 312 |
+
w, h = img.size
|
| 313 |
+
scale = max(bw / w, bh / h)
|
| 314 |
+
new_w = max(bw, math.ceil(w * scale))
|
| 315 |
+
new_h = max(bh, math.ceil(h * scale))
|
| 316 |
+
img = img.resize((new_w, new_h), Image.BICUBIC)
|
| 317 |
+
left = (new_w - bw) // 2
|
| 318 |
+
top = (new_h - bh) // 2
|
| 319 |
+
img = img.crop((left, top, left + bw, top + bh))
|
| 320 |
+
except Exception as e:
|
| 321 |
+
print(f"读取失败 {f}: {e}")
|
| 322 |
+
img = Image.new("RGB", (bw, bh), (0, 0, 0))
|
| 323 |
+
|
| 324 |
+
img = transforms.functional.to_tensor(img)
|
| 325 |
+
img = self.normalize(img)
|
| 326 |
+
return img, 0
|
| 327 |
+
|
| 328 |
+
|
| 329 |
+
class BucketBatchSampler(Sampler):
|
| 330 |
+
"""
|
| 331 |
+
分桶 batch 采样器:每个 batch 内所有图来自同一个桶(尺寸一致)。
|
| 332 |
+
每个 epoch 重新打乱。
|
| 333 |
+
"""
|
| 334 |
+
def __init__(self, dataset, batch_size, shuffle=True, drop_last=True):
|
| 335 |
+
self.dataset = dataset
|
| 336 |
+
self.batch_size = batch_size
|
| 337 |
+
self.shuffle = shuffle
|
| 338 |
+
self.drop_last = drop_last
|
| 339 |
+
|
| 340 |
+
def _make_batches(self):
|
| 341 |
+
batches = []
|
| 342 |
+
for bucket, indices in self.dataset.bucket_map.items():
|
| 343 |
+
indices = list(indices)
|
| 344 |
+
if self.shuffle:
|
| 345 |
+
random.shuffle(indices)
|
| 346 |
+
for i in range(0, len(indices), self.batch_size):
|
| 347 |
+
batch = indices[i:i + self.batch_size]
|
| 348 |
+
if len(batch) == self.batch_size or not self.drop_last:
|
| 349 |
+
batches.append(batch)
|
| 350 |
+
if self.shuffle:
|
| 351 |
+
random.shuffle(batches)
|
| 352 |
+
return batches
|
| 353 |
+
|
| 354 |
+
def __iter__(self):
|
| 355 |
+
return iter(self._make_batches())
|
| 356 |
+
|
| 357 |
+
def __len__(self):
|
| 358 |
+
# 估算
|
| 359 |
+
total = 0
|
| 360 |
+
for indices in self.dataset.bucket_map.values():
|
| 361 |
+
n = len(indices)
|
| 362 |
+
total += n // self.batch_size if self.drop_last else math.ceil(n / self.batch_size)
|
| 363 |
+
return total
|
| 364 |
+
|
| 365 |
+
|
| 366 |
+
# ============================================================
|
| 367 |
+
# 5. Dummy 数据集(不同分辨率,测试分桶)
|
| 368 |
+
# ============================================================
|
| 369 |
+
|
| 370 |
+
class DummyBucketDataset(Dataset):
|
| 371 |
+
"""
|
| 372 |
+
生成不同分辨率的随机图片,用于测试分桶逻辑。
|
| 373 |
+
每张图随机选一个宽高比。
|
| 374 |
+
"""
|
| 375 |
+
def __init__(self, size=200, buckets=None):
|
| 376 |
+
self.size = size
|
| 377 |
+
self.buckets = buckets
|
| 378 |
+
# 随机分配每张图到某个桶
|
| 379 |
+
self.assignments = []
|
| 380 |
+
for i in range(size):
|
| 381 |
+
b = random.choice(buckets)
|
| 382 |
+
self.assignments.append(b)
|
| 383 |
+
|
| 384 |
+
# 构建 bucket_map
|
| 385 |
+
self.bucket_map = {b: [] for b in buckets}
|
| 386 |
+
for idx, b in enumerate(self.assignments):
|
| 387 |
+
self.bucket_map[b].append(idx)
|
| 388 |
+
|
| 389 |
+
print(f"Dummy 数据集: {size} 张图")
|
| 390 |
+
for b, idxs in self.bucket_map.items():
|
| 391 |
+
print(f" 桶 {b}: {len(idxs)} 张")
|
| 392 |
+
|
| 393 |
+
self.normalize = transforms.Normalize([0.5, 0.5, 0.5], [0.5, 0.5, 0.5])
|
| 394 |
+
|
| 395 |
+
def __len__(self):
|
| 396 |
+
return self.size
|
| 397 |
+
|
| 398 |
+
def __getitem__(self, idx):
|
| 399 |
+
bh, bw = self.assignments[idx]
|
| 400 |
+
# 随机图,归一化到 [-1,1]
|
| 401 |
+
img = torch.randn(3, bh, bw) * 0.5
|
| 402 |
+
return img, 0
|
| 403 |
+
|
| 404 |
+
|
| 405 |
+
# ============================================================
|
| 406 |
+
# 6. 数据加载器
|
| 407 |
+
# ============================================================
|
| 408 |
+
def get_dataloader(args):
|
| 409 |
+
buckets = make_buckets(base=args.bucket_base, align=16)
|
| 410 |
+
print(f"桶列表: {buckets}")
|
| 411 |
+
|
| 412 |
+
if args.dummy:
|
| 413 |
+
ds = DummyBucketDataset(size=args.dummy_size, buckets=buckets)
|
| 414 |
+
else:
|
| 415 |
+
ds = BucketImageFolder(
|
| 416 |
+
args.data, buckets,
|
| 417 |
+
num_threads=2,
|
| 418 |
+
cache_file="./sizes_cache.json", # ← 关键
|
| 419 |
+
)
|
| 420 |
+
|
| 421 |
+
sampler = BucketBatchSampler(
|
| 422 |
+
ds, batch_size=args.batch_size, shuffle=True, drop_last=True
|
| 423 |
+
)
|
| 424 |
+
|
| 425 |
+
return DataLoader(
|
| 426 |
+
ds,
|
| 427 |
+
batch_sampler=sampler,
|
| 428 |
+
num_workers=args.num_workers,
|
| 429 |
+
pin_memory=torch.cuda.is_available(),
|
| 430 |
+
)
|
| 431 |
+
|
| 432 |
+
# ============================================================
|
| 433 |
+
# 7. 感知损失(可选)
|
| 434 |
+
# ============================================================
|
| 435 |
+
|
| 436 |
+
class SimplePerceptualLoss(nn.Module):
|
| 437 |
+
"""
|
| 438 |
+
轻量版感知损失:用 torchvision 的 VGG16 前几层特征。
|
| 439 |
+
"""
|
| 440 |
+
def __init__(self):
|
| 441 |
+
super().__init__()
|
| 442 |
+
from torchvision import models
|
| 443 |
+
vgg = models.vgg16(weights=models.VGG16_Weights.DEFAULT).features
|
| 444 |
+
self.slice = nn.Sequential(*[vgg[i] for i in range(9)])
|
| 445 |
+
for p in self.parameters():
|
| 446 |
+
p.requires_grad = False
|
| 447 |
+
self.register_buffer('mean', torch.tensor([0.485, 0.456, 0.406]).view(1, 3, 1, 1))
|
| 448 |
+
self.register_buffer('std', torch.tensor([0.229, 0.224, 0.225]).view(1, 3, 1, 1))
|
| 449 |
+
|
| 450 |
+
def forward(self, x, y):
|
| 451 |
+
x = (x + 1) / 2
|
| 452 |
+
y = (y + 1) / 2
|
| 453 |
+
x = (x - self.mean) / self.std
|
| 454 |
+
y = (y - self.mean) / self.std
|
| 455 |
+
fx = self.slice(x)
|
| 456 |
+
fy = self.slice(y)
|
| 457 |
+
return F.l1_loss(fx, fy)
|
| 458 |
+
|
| 459 |
+
import lpips
|
| 460 |
+
|
| 461 |
+
class PerceptualLoss(nn.Module):
|
| 462 |
+
def __init__(self):
|
| 463 |
+
super().__init__()
|
| 464 |
+
self.lpips = lpips.LPIPS(net='squeeze').cuda().eval()
|
| 465 |
+
for p in self.lpips.parameters():
|
| 466 |
+
p.requires_grad = False
|
| 467 |
+
|
| 468 |
+
def forward(self, x, y):
|
| 469 |
+
# 输入 [-1,1],直接传
|
| 470 |
+
return self.lpips(x, y).mean()
|
| 471 |
+
|
| 472 |
+
def load_checkpointsimpe(model, optimizer, path, device='cuda'):
|
| 473 |
+
ckpt = torch.load(path, map_location=device)
|
| 474 |
+
|
| 475 |
+
model.load_state_dict(ckpt['model_state_dict'])
|
| 476 |
+
optimizer.load_state_dict(ckpt['optimizer_state_dict'])
|
| 477 |
+
|
| 478 |
+
start_epoch = ckpt['epoch'] + 1
|
| 479 |
+
print(f"从 epoch {ckpt['epoch']} 恢复,从 epoch {start_epoch} 继续")
|
| 480 |
+
|
| 481 |
+
return start_epoch
|
| 482 |
+
|
| 483 |
+
def load_checkpoint(model, optimizer, scheduler, scaler, path, device='cuda'):
|
| 484 |
+
ckpt = torch.load(path, map_location=device)
|
| 485 |
+
|
| 486 |
+
model.load_state_dict(ckpt['model_state_dict'])
|
| 487 |
+
optimizer.load_state_dict(ckpt['optimizer_state_dict'])
|
| 488 |
+
|
| 489 |
+
if 'scheduler_state_dict' in ckpt and scheduler is not None:
|
| 490 |
+
scheduler.load_state_dict(ckpt['scheduler_state_dict'])
|
| 491 |
+
|
| 492 |
+
if 'scaler_state_dict' in ckpt and scaler is not None:
|
| 493 |
+
scaler.load_state_dict(ckpt['scaler_state_dict'])
|
| 494 |
+
|
| 495 |
+
start_epoch = ckpt['epoch'] + 1
|
| 496 |
+
num_iter = ckpt.get('num_iter', 0)
|
| 497 |
+
print(f"恢复: epoch {ckpt['epoch']} → {start_epoch}, iter {num_iter}")
|
| 498 |
+
|
| 499 |
+
return start_epoch, num_iter
|
| 500 |
+
|
| 501 |
+
# ============================================================
|
| 502 |
+
# 8. 训练
|
| 503 |
+
# ============================================================
|
| 504 |
+
|
| 505 |
+
import time
|
| 506 |
+
import bitsandbytes as bnb
|
| 507 |
+
def train(args):
|
| 508 |
+
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
|
| 509 |
+
os.makedirs(args.out_dir, exist_ok=True)
|
| 510 |
+
os.makedirs(os.path.join(args.out_dir, 'samples'), exist_ok=True)
|
| 511 |
+
|
| 512 |
+
loader = get_dataloader(args)
|
| 513 |
+
|
| 514 |
+
model = FSQVAE(levels=args.levels, channel=args.channel).to(device)
|
| 515 |
+
#if args.resume:
|
| 516 |
+
#start_epoch = load_checkpoint(model, optimizer, args.resume, device)
|
| 517 |
+
#加载预训练
|
| 518 |
+
n_params = sum(p.numel() for p in model.parameters())
|
| 519 |
+
print(f"模型参数量: {n_params/1e6:.2f} M")
|
| 520 |
+
print(f"FSQ levels: {args.levels}, 码本大小: {int(torch.tensor(args.levels).prod())}")
|
| 521 |
+
print(f"下采样倍率: 16×(4 层 stride=2)")
|
| 522 |
+
|
| 523 |
+
#optimizer = torch.optim.Adam(model.parameters(), lr=args.lr)
|
| 524 |
+
optimizer = bnb.optim.Adam8bit(model.parameters(), lr=args.lr)
|
| 525 |
+
scheduler = torch.optim.lr_scheduler.CosineAnnealingLR(
|
| 526 |
+
optimizer, T_max=args.epochs * len(loader)
|
| 527 |
+
)
|
| 528 |
+
|
| 529 |
+
percep = None
|
| 530 |
+
if args.perceptual_weight > 0:
|
| 531 |
+
#percep = SimplePerceptualLoss().to(device).eval()
|
| 532 |
+
percep = PerceptualLoss().to(device).eval()
|
| 533 |
+
print("启用感知损失")
|
| 534 |
+
|
| 535 |
+
l1_fn = nn.L1Loss()
|
| 536 |
+
num_iter = 0
|
| 537 |
+
|
| 538 |
+
# 混合精度
|
| 539 |
+
scaler = torch.cuda.amp.GradScaler()
|
| 540 |
+
|
| 541 |
+
if args.resume:
|
| 542 |
+
start_epoch, num_iter = load_checkpoint(model, optimizer, scheduler, scaler, args.resume, device)
|
| 543 |
+
#start_epoch = load_checkpointsimpe(model, optimizer, args.resume, device)
|
| 544 |
+
for epoch in range(args.epochs):
|
| 545 |
+
model.train()
|
| 546 |
+
for imgs, _ in loader:
|
| 547 |
+
imgs = imgs.to(device)
|
| 548 |
+
num_iter += 1
|
| 549 |
+
|
| 550 |
+
#t1 = time.time()
|
| 551 |
+
with torch.cuda.amp.autocast():
|
| 552 |
+
recon = model(imgs)
|
| 553 |
+
l1 = l1_fn(imgs, recon)
|
| 554 |
+
loss = l1
|
| 555 |
+
#t2 = time.time()
|
| 556 |
+
#print(f"[前向] {t2-t1:.3f}s | 输入 {tuple(imgs.shape)}")
|
| 557 |
+
|
| 558 |
+
if percep is not None:
|
| 559 |
+
p_loss = percep(imgs, recon)
|
| 560 |
+
loss = loss + args.perceptual_weight * p_loss
|
| 561 |
+
#t3 = time.time()
|
| 562 |
+
#print(f"[感知] {t3-t2:.3f}s")
|
| 563 |
+
|
| 564 |
+
optimizer.zero_grad()
|
| 565 |
+
#loss.backward()
|
| 566 |
+
scaler.scale(loss).backward()
|
| 567 |
+
torch.nn.utils.clip_grad_norm_(model.parameters(), 1.0)
|
| 568 |
+
#optimizer.step()
|
| 569 |
+
scaler.step(optimizer)
|
| 570 |
+
scaler.update()
|
| 571 |
+
scheduler.step()
|
| 572 |
+
#t4 = time.time()
|
| 573 |
+
#print(f"[反向] {t4-t3:.3f}s")
|
| 574 |
+
|
| 575 |
+
if num_iter % args.log_interval == 0:
|
| 576 |
+
msg = f"epoch {epoch} | iter {num_iter} | l1 {l1.item():.4f}"
|
| 577 |
+
if percep is not None:
|
| 578 |
+
msg += f" | percep {p_loss.item():.4f}"
|
| 579 |
+
print(msg)
|
| 580 |
+
|
| 581 |
+
if num_iter % args.sample_interval == 0:
|
| 582 |
+
with torch.no_grad(): #图片采样
|
| 583 |
+
n = min(8, imgs.shape[0])
|
| 584 |
+
grid = make_grid(
|
| 585 |
+
torch.cat([imgs[:n], recon[:n]]),
|
| 586 |
+
nrow=n,
|
| 587 |
+
)
|
| 588 |
+
save_image(
|
| 589 |
+
grid,
|
| 590 |
+
os.path.join(args.out_dir, 'samples', f'{num_iter}.jpg'),
|
| 591 |
+
normalize=True,
|
| 592 |
+
)
|
| 593 |
+
|
| 594 |
+
if num_iter % args.save_interval == 0 :
|
| 595 |
+
# ---- 保存(含完整状态)----
|
| 596 |
+
torch.save({
|
| 597 |
+
'epoch': epoch,
|
| 598 |
+
'num_iter': num_iter,
|
| 599 |
+
'model_state_dict': model.state_dict(),
|
| 600 |
+
'optimizer_state_dict': optimizer.state_dict(),
|
| 601 |
+
'scheduler_state_dict': scheduler.state_dict(),
|
| 602 |
+
'scaler_state_dict': scaler.state_dict(),
|
| 603 |
+
}, os.path.join(args.out_dir, f'ckpt_{epoch}.pt'))
|
| 604 |
+
|
| 605 |
+
|
| 606 |
+
# ============================================================
|
| 607 |
+
# 9. 参数
|
| 608 |
+
# ============================================================
|
| 609 |
+
###改用bnb8bit训练
|
| 610 |
+
def get_args():
|
| 611 |
+
p = argparse.ArgumentParser()
|
| 612 |
+
# 数据
|
| 613 |
+
p.add_argument('--data', type=str, default=None, help='图片文件夹路径')
|
| 614 |
+
p.add_argument('--dummy', action='store_true', help='用随机数据测试')
|
| 615 |
+
p.add_argument('--dummy-size', type=int, default=200)
|
| 616 |
+
p.add_argument('--num-workers', type=int, default=1)
|
| 617 |
+
p.add_argument('--bucket-base', type=int, default=256,
|
| 618 |
+
help='桶基准尺寸,桶的总像素数接近 base²')
|
| 619 |
+
# 模型
|
| 620 |
+
p.add_argument('--levels', type=int, nargs='+', default=[8, 5, 5, 5],
|
| 621 |
+
help='FSQ levels,例如 8 5 5 5')
|
| 622 |
+
p.add_argument('--channel', type=int, default=128)
|
| 623 |
+
# 训练
|
| 624 |
+
p.add_argument('--epochs', type=int, default=10)
|
| 625 |
+
p.add_argument('--batch-size', type=int, default=32)
|
| 626 |
+
p.add_argument('--lr', type=float, default=1e-4)
|
| 627 |
+
p.add_argument('--perceptual-weight', type=float, default=0.1)
|
| 628 |
+
# 日志
|
| 629 |
+
p.add_argument('--log-interval', type=int, default=5)
|
| 630 |
+
p.add_argument('--sample-interval', type=int, default=500)
|
| 631 |
+
p.add_argument('--save-interval', type=int, default=1)
|
| 632 |
+
p.add_argument('--out-dir', type=str, default='./fsq_demo_out')
|
| 633 |
+
|
| 634 |
+
p.add_argument('--resume', type=str, default=None,
|
| 635 |
+
help='检查点路径,如 ./fsqsmall_out/ckpt_0.pt;None 表示从头训练')
|
| 636 |
+
return p.parse_args()
|
| 637 |
+
|
| 638 |
+
|
| 639 |
+
|
| 640 |
+
|
| 641 |
+
####
|
| 642 |
+
|
| 643 |
+
'''
|
| 644 |
+
#小模型配置 1mb
|
| 645 |
+
!python simplefsq32.py \
|
| 646 |
+
--data output_256/ \
|
| 647 |
+
--epochs 10 \
|
| 648 |
+
--batch-size 64 \
|
| 649 |
+
--channel 128 \
|
| 650 |
+
--levels 8 5 5 5 \
|
| 651 |
+
--bucket-base 256 \
|
| 652 |
+
--lr 1e-4 \
|
| 653 |
+
--perceptual-weight 0.1 \
|
| 654 |
+
--log-interval 50 \
|
| 655 |
+
--sample-interval 500 \
|
| 656 |
+
--save-interval 500 \
|
| 657 |
+
--out-dir ./fsqsmall_out
|
| 658 |
+
|
| 659 |
+
#中等 6mb模型测试
|
| 660 |
+
|
| 661 |
+
!python simplefsq1.py \
|
| 662 |
+
--data output_256/ \
|
| 663 |
+
--epochs 1 \
|
| 664 |
+
--batch-size 8 \
|
| 665 |
+
--channel 256 \
|
| 666 |
+
--levels 7 5 5 5 5 \
|
| 667 |
+
--bucket-base 256 \
|
| 668 |
+
--lr 1e-4 \
|
| 669 |
+
--perceptual-weight 0.1 \
|
| 670 |
+
--log-interval 50 \
|
| 671 |
+
--sample-interval 500 \
|
| 672 |
+
--save-interval 500 \
|
| 673 |
+
--out-dir ./fsq_out
|
| 674 |
+
'''
|
| 675 |
+
# ============================================================
|
| 676 |
+
# 10. 入口
|
| 677 |
+
# ============================================================
|
| 678 |
+
|
| 679 |
+
if __name__ == '__main__':
|
| 680 |
+
args = get_args()
|
| 681 |
+
print(args)
|
| 682 |
+
train(args)
|