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a012ee3 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | from __future__ import annotations
import argparse
import copy
import glob
import json
import math
import os
import time
import numpy as np
import torch
import torch.nn.functional as F
from transformers import CLIPTextModel
from dit import DiT
def build_cache(data, cache):
shards = sorted(glob.glob(f"{data}/shard_*.npz"))
if not shards:
raise SystemExit(f"no shards in {data}")
lat, tok = [], []
for i, s in enumerate(shards):
z = np.load(s)
lat.append(z["latents"]); tok.append(z["tokens"])
if (i + 1) % 50 == 0:
print(f" loaded {i+1}/{len(shards)} shards", flush=True)
lat = np.concatenate(lat); tok = np.concatenate(tok)
np.save(f"{cache}_lat.npy", lat); np.save(f"{cache}_tok.npy", tok)
return lat, tok
def main():
ap = argparse.ArgumentParser()
ap.add_argument("--data", default="/root/v5data")
ap.add_argument("--cache", default="/root/v5cache")
ap.add_argument("--out", default="/root/runs/pm5")
ap.add_argument("--steps", type=int, default=120000)
ap.add_argument("--batch", type=int, default=256)
ap.add_argument("--lr", type=float, default=2e-4)
ap.add_argument("--warmup", type=int, default=1000)
ap.add_argument("--dim", type=int, default=384)
ap.add_argument("--depth", type=int, default=12)
ap.add_argument("--heads", type=int, default=6)
ap.add_argument("--cfg-dropout", type=float, default=0.1)
ap.add_argument("--ema", type=float, default=0.9999)
ap.add_argument("--val-size", type=int, default=4096)
ap.add_argument("--val-every", type=int, default=2000)
ap.add_argument("--log-every", type=int, default=200)
ap.add_argument("--save-every", type=int, default=5000)
ap.add_argument("--clip", default="openai/clip-vit-base-patch32")
ap.add_argument("--resume", default="")
ap.add_argument("--seed", type=int, default=0)
args = ap.parse_args()
dev = "cuda"
os.makedirs(args.out, exist_ok=True)
torch.manual_seed(args.seed)
torch.backends.cuda.matmul.allow_tf32 = True
torch.backends.cudnn.allow_tf32 = True
if os.path.exists(f"{args.cache}_lat.npy"):
lat = np.load(f"{args.cache}_lat.npy", mmap_mode="r")
tok = np.load(f"{args.cache}_tok.npy")
else:
lat, tok = build_cache(args.data, args.cache)
N = len(lat)
perm = np.random.RandomState(args.seed).permutation(N)
val_i = np.sort(perm[:args.val_size])
tr_i = perm[args.val_size:]
print(f"[data] {N} pairs, {len(tr_i)} train, {len(val_i)} val", flush=True)
txt = CLIPTextModel.from_pretrained(args.clip).to(dev).eval()
for p in txt.parameters():
p.requires_grad_(False)
@torch.no_grad()
def encode(ids):
o = txt(input_ids=ids)
return o.last_hidden_state.float(), o.pooler_output.float()
null_ids = torch.full((1, tok.shape[1]), 0, dtype=torch.long, device=dev)
null_ids[0, 0] = 49406; null_ids[0, 1:] = 49407
null_seq, null_pool = encode(null_ids)
tok_t = torch.from_numpy(tok.astype(np.int64))
vlat = torch.from_numpy(np.asarray(lat[val_i])).float()
vseq, vpool = [], []
with torch.no_grad():
for i in range(0, len(val_i), 512):
s, p = encode(tok_t[val_i[i:i+512]].to(dev))
vseq.append(s); vpool.append(p)
vseq = torch.cat(vseq); vpool = torch.cat(vpool)
vg = torch.Generator(device=dev).manual_seed(1234)
vx1 = vlat.to(dev)
vx0 = torch.randn(vx1.shape, device=dev, generator=vg)
vt = torch.sigmoid(torch.randn(vx1.shape[0], device=dev, generator=vg))
model = DiT(dim=args.dim, depth=args.depth, heads=args.heads).to(dev)
ema = copy.deepcopy(model).eval()
for p in ema.parameters():
p.requires_grad_(False)
opt = torch.optim.AdamW(model.parameters(), lr=args.lr, betas=(0.9, 0.99), weight_decay=0.0)
print(f"[model] {sum(p.numel() for p in model.parameters())/1e6:.2f}M trainable", flush=True)
start, best = 0, float("inf")
if args.resume and os.path.exists(args.resume):
ck = torch.load(args.resume, map_location=dev)
model.load_state_dict(ck["model"]); ema.load_state_dict(ck["ema"])
opt.load_state_dict(ck["opt"]); start = ck["step"] + 1; best = ck.get("best", best)
def lr_at(s):
if s < args.warmup:
return args.lr * (s + 1) / args.warmup
p = (s - args.warmup) / max(1, args.steps - args.warmup)
return args.lr * (0.1 + 0.9 * 0.5 * (1 + math.cos(math.pi * min(1.0, p))))
@torch.no_grad()
def val_loss():
tot, n = 0.0, 0
for j in range(0, vx1.shape[0], args.batch):
sl = slice(j, j + args.batch)
m = vx1[sl].shape[0]
tb = vt[sl].view(-1, 1, 1, 1)
xt = (1 - tb) * vx0[sl] + tb * vx1[sl]
with torch.autocast("cuda", dtype=torch.bfloat16):
v = ema(xt, vt[sl], vseq[sl], vpool[sl])
tot += F.mse_loss(v.float(), vx1[sl] - vx0[sl]).item() * m
n += m
return tot / n
logf = open(f"{args.out}/log.jsonl", "a")
gen = torch.Generator(device=dev).manual_seed(args.seed)
run, t0 = 0.0, time.time()
for step in range(start, args.steps):
i = tr_i[np.random.randint(0, len(tr_i), args.batch)]
x1 = torch.from_numpy(np.asarray(lat[np.sort(i)])).to(dev).float()
seq, pool = encode(tok_t[np.sort(i)].to(dev))
drop = torch.rand(x1.shape[0], device=dev, generator=gen) < args.cfg_dropout
seq = torch.where(drop[:, None, None], null_seq, seq)
pool = torch.where(drop[:, None], null_pool, pool)
x0 = torch.randn(x1.shape, device=dev, generator=gen)
t = torch.sigmoid(torch.randn(x1.shape[0], device=dev, generator=gen))
tb = t.view(-1, 1, 1, 1)
xt = (1 - tb) * x0 + tb * x1
target = x1 - x0
for g in opt.param_groups:
g["lr"] = lr_at(step)
with torch.autocast("cuda", dtype=torch.bfloat16):
v = model(xt, t, seq, pool)
loss = F.mse_loss(v.float(), target)
opt.zero_grad(set_to_none=True)
loss.backward()
gn = torch.nn.utils.clip_grad_norm_(model.parameters(), 1.0)
opt.step()
d = args.ema if step > args.warmup else 0.0
with torch.no_grad():
for pe, pm in zip(ema.parameters(), model.parameters()):
pe.mul_(d).add_(pm.detach(), alpha=1 - d)
for be, bm in zip(ema.buffers(), model.buffers()):
be.copy_(bm)
run += loss.item()
if (step + 1) % args.log_every == 0:
el = time.time() - t0
sps = args.log_every / el
print(f"[s{step+1:06d}] loss={run/args.log_every:.4f} lr={lr_at(step):.2e} "
f"gnorm={gn:.2f} {sps:.2f} steps/s eta={(args.steps-step-1)/sps/3600:.1f}h", flush=True)
logf.write(json.dumps({"step": step + 1, "loss": run / args.log_every,
"steps_per_s": sps}) + "\n"); logf.flush()
run, t0 = 0.0, time.time()
if (step + 1) % args.val_every == 0 or step + 1 == args.steps:
vl = val_loss()
tag = ""
if vl < best:
best = vl
torch.save({"ema": ema.state_dict(), "step": step, "val": vl}, f"{args.out}/best.pt")
tag = " *best*"
print(f"[s{step+1:06d}] val_loss={vl:.5f}{tag}", flush=True)
logf.write(json.dumps({"step": step + 1, "val_loss": vl}) + "\n"); logf.flush()
t0 = time.time()
if (step + 1) % args.save_every == 0 or step + 1 == args.steps:
torch.save({"model": model.state_dict(), "ema": ema.state_dict(), "opt": opt.state_dict(),
"step": step, "best": best}, f"{args.out}/latest.pt")
print("TRAINDONE best_val", best, flush=True)
if __name__ == "__main__":
main()
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