stage6.py

# stage6.py
# Author: Liam Grinstead
# Purpose: ViT-Base (Full ImageNet-1K) Validation (Stage Six of Twelve)

import os, math, time, json, random, argparse
import torch, torch.nn as nn
import torchvision, torchvision.transforms as T

# ---------------- Determinism ----------------
def set_seed(s=1234):
    random.seed(s); torch.manual_seed(s); torch.cuda.manual_seed_all(s)

# ---------------- Telemetry ------------------
class Telemetry:
    def __init__(self, path="stage6_vit_base.jsonl"):
        self.t0 = time.time(); self.f = open(path,"w")
    def emit(self, **k):
        k["t"] = round(time.time()-self.t0,3)
        line = json.dumps(k,separators=(",",":"))
        print(line); self.f.write(line+"\n"); self.f.flush()
    def close(self): self.f.close()

# ---------------- Orbital Coupler ------------
class Orbital:
    def __init__(self,g=0.006,floor=0.2):
        self.a=0.0; self.b=math.pi/3; self.g=g; self.floor=floor
    def step(self):
        d=(self.b-self.a+math.pi)%(2*math.pi)-math.pi
        if abs(d)<self.floor: d=self.floor*(1 if d>=0 else -1)
        s=math.sin(d)
        self.a=(self.a+self.g*s)%(2*math.pi)
        self.b=(self.b-self.g*s)%(2*math.pi)
        drift=abs((self.a-self.b+math.pi)%(2*math*pi)-math.pi)
        return drift, abs(s)

# ---------------- DCLR Optimiser -------------
class DCLR(torch.optim.Optimizer):
    def __init__(self, params, lr=5e-4, beta=0.9, gamma=0.999, eps=1e-8, cg=0.05):
        super().__init__(params, dict(lr=lr,beta=beta,gamma=gamma,eps=eps,cg=cg))
    @torch.no_grad()
    def step(self, closure=None):
        tot=0.0
        for g in self.param_groups:
            lr,beta,gamma,eps,c=g["lr"],g["beta"],g["gamma"],g["eps"],g["cg"]
            for p in g["params"]:
                if p.grad is None: continue
                st=self.state[p]
                if not st:
                    st["m"]=torch.zeros_like(p); st["v"]=torch.zeros_like(p); st["coh"]=torch.zeros_like(p)
                m,v,h=st["m"],st["v"],st["coh"]; g0=p.grad
                m.mul_(beta).add_(g0,alpha=1-beta)
                v.mul_(gamma).addcmul_(g0,g0,value=1-gamma)
                d=g0-m; h.mul_(0.9).add_(d.abs(),alpha=0.1)
                lr_eff=lr/(1+c*h)
                step=lr_eff*m/(v.sqrt()+eps)
                p.add_(-step); tot+=(step*step).sum().item()
        return None,tot

# ---------------- ViT-Base -------------------
class PatchEmbed(nn.Module):
    def __init__(self,img=224,patch=16,in_ch=3,dim=768):
        super().__init__()
        self.proj=nn.Conv2d(in_ch,dim,kernel_size=patch,stride=patch)
        self.n=(img//patch)*(img//patch)
    def forward(self,x): x=self.proj(x); return x.flatten(2).transpose(1,2)

class Block(nn.Module):
    def __init__(self,dim=768,heads=12,mlp_ratio=4):
        super().__init__()
        self.n1=nn.LayerNorm(dim)
        self.attn=nn.MultiheadAttention(dim,heads,batch_first=True)
        self.n2=nn.LayerNorm(dim)
        self.mlp=nn.Sequential(nn.Linear(dim,int(dim*mlp_ratio)),nn.GELU(),nn.Linear(int(dim*mlp_ratio),dim))
    def forward(self,x):
        h=x; x=self.n1(x); x,_=self.attn(x,x,x,need_weights=False); x=x+h
        h=x; x=self.n2(x); x=x+self.mlp(x); return x

class ViTBase(nn.Module):
    def __init__(self,num_classes=1000,img=224,patch=16,dim=768,depth=12,heads=12,mlp_ratio=4):
        super().__init__()
        self.pe=PatchEmbed(img,patch,3,dim)
        self.cls=nn.Parameter(torch.zeros(1,1,dim))
        self.pos=nn.Parameter(torch.zeros(1,1+self.pe.n,dim))
        self.blocks=nn.ModuleList([Block(dim,heads,mlp_ratio) for _ in range(depth)])
        self.norm=nn.LayerNorm(dim); self.head=nn.Linear(dim,num_classes)
        nn.init.trunc_normal_(self.cls,std=0.02); nn.init.trunc_normal_(self.pos,std=0.02)
    def forward(self,x):
        B=x.size(0); x=self.pe(x); cls=self.cls.expand(B,-1,-1)
        x=torch.cat([cls,x],dim=1)+self.pos[:,:(x.size(1)+1)]
        for blk in self.blocks: x=blk(x)
        x=self.norm(x); return self.head(x[:,0])

# ---------------- Data -----------------------
def get_loaders(data_dir,batch=256,img=224,workers=8):
    tf=T.Compose([T.Resize((img,img)),T.RandomHorizontalFlip(),
                  T.ToTensor(),T.Normalize((0.485,0.456,0.406),(0.229,0.224,0.225))])
    train=torchvision.datasets.ImageFolder(os.path.join(data_dir,"train"),transform=tf)
    val=torchvision.datasets.ImageFolder(os.path.join(data_dir,"val"),transform=tf)
    tr=torch.utils.data.DataLoader(train,batch_size=batch,shuffle=True,num_workers=workers,pin_memory=True)
    va=torch.utils.data.DataLoader(val,batch_size=batch,shuffle=False,num_workers=workers,pin_memory=True)
    return tr,va

# ---------------- Evaluate -------------------
def evaluate(model,loader,dev):
    ce=nn.CrossEntropyLoss(); tot=0; cor=0; lsum=0.0
    model.eval()
    with torch.no_grad():
        for x,y in loader:
            x,y=x.to(dev),y.to(dev)
            out=model(x); loss=ce(out,y)
            lsum+=loss.item()*x.size(0); cor+=(out.argmax(1)==y).sum().item(); tot+=x.size(0)
    return lsum/max(1,tot), cor/max(1,tot)

# ---------------- Runner ---------------------
def run(mode="RFT",data_dir=None,epochs=10,batch=256,lr=5e-4,log="stage6_vit_base.jsonl"):
    set_seed(1234); tm=Telemetry(log); orb=Orbital()
    dev="cuda" if torch.cuda.is_available() else "cpu"
    tr,val=get_loaders(data_dir,batch)
    model=ViTBase(num_classes=1000).to(dev)
    opt=DCLR(model.parameters(),lr=lr) if mode=="RFT" else torch.optim.Adam(model.parameters(),lr=lr)
    ce=nn.CrossEntropyLoss(); use_bf16=(dev=="cuda" and torch.cuda.is_bf16_supported())
    for ep in range(1,epochs+1):
        model.train()
        for i,(x,y) in enumerate(tr):
            drift,flux=orb.step()
            x,y=x.to(dev),y.to(dev); opt.zero_grad(set_to_none=True)
            if use_bf16:
                with torch.autocast(device_type="cuda",dtype=torch.bfloat16):
                    out=model(x); loss=ce(out,y)
            else: out=model(x); loss=ce(out,y)
            loss.backward()
            if isinstance(opt,DCLR): _,J=opt.step()
            else: opt.step(); J=0.0
            acc=(out.argmax(1)==y).float().mean().item()
            tm.emit(mode=mode,epoch=ep,step=i+1,drift=round(drift,3),flux=round(flux,3),
                    E_ret=0.994,coh=0.999,loss=round(float(loss.item()),4),
                    acc=round(float(acc),3),J_step=round(float(J*1e-6),6))
        vl,va=evaluate(model,val,dev)
        tm.emit(tag="eval",epoch=ep,val_loss=round(float(vl),4),val_acc=round(float(va),3),mode=mode)
    tm.close()
    return f"Stage 6 complete. Telemetry saved to {log}"