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YashashMathur commited on 13 days ago

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b022bda

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1 Parent(s): 9e1ad05

fix: C-4 reward clamp, C-6 HF_TOKEN, W-2 citation floor, W-9 dup import

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hf_training/train.py +485 -497

hf_training/train.py CHANGED Viewed

@@ -1,497 +1,485 @@
-from unsloth import FastLanguageModel
-"""
-AEGIS Training Script for HF Spaces (A10G Small, 24GB VRAM)
-- Loads Qwen2.5-7B-Unsloth-bnb-4bit + step_50 LoRA adapter
-- Runs 10 remaining SFT steps + 500 GRPO steps
-- Saves LoRA checkpoints to HF Hub every 50 GRPO steps
-- Serves a minimal status page on :7860 so the Space stays alive
-- Prints "TRAINING COMPLETE - PLEASE DOWNGRADE HARDWARE" when done
-"""
-import os, json, re, random, gc, sys, threading, time
-import torch
-import bitsandbytes as bnb
-import numpy as np
-from collections import Counter, defaultdict, deque
-from http.server import HTTPServer, BaseHTTPRequestHandler
-from safetensors.torch import load_file
-from huggingface_hub import login, HfApi, hf_hub_download, snapshot_download
-from peft import set_peft_model_state_dict
-# â”€â”€â”€ Auth & Config â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€
-HF_TOKEN = os.environ.get("HF_TOKEN") or os.environ.get("HUGGING_FACE_HUB_TOKEN")
-if not HF_TOKEN:
-    print("\n" + "="*80)
-    print(" MISSING HF_TOKEN SECRET ".center(80, "#"))
-    print(" 1. Go to your Space 'Settings' tab. ".center(80))
-    print(" 2. Find 'Variables and Secrets' section. ".center(80))
-    print(" 3. Click 'New Secret', name it 'HF_TOKEN'. ".center(80))
-    print(" 4. Paste your WRITE-access token (huggingface.co/settings/tokens). ".center(80))
-    print(" 5. Restart the Space. ".center(80))
-    print("".center(80, "#"))
-    print("="*80 + "\n")
-    sys.exit(0)  # Exit gracefully
-HF_USERNAME = os.environ.get("HF_USERNAME", "YashashMathur")
-STEP50_REPO = f"{HF_USERNAME}/aegis-step50"
-CKPT_REPO   = f"{HF_USERNAME}/aegis-training-checkpoints"
-login(token=HF_TOKEN)
-api = HfApi(token=HF_TOKEN)
-# Optional WandB Logging
-WANDB_API_KEY = os.environ.get("WANDB_API_KEY")
-USE_WANDB = False
-if WANDB_API_KEY:
-    try:
-        import wandb
-        wandb.login(key=WANDB_API_KEY)
-        wandb.init(project="aegis-oversight", name="grpo-hf-training")
-        USE_WANDB = True
-    except Exception as e:
-        print(f"WandB init failed: {e}")
-try:
-    api.create_repo(CKPT_REPO, private=True, exist_ok=True)
-except Exception as e:
-    print(f"Repo create: {e}")
-MAX_SEQ_LEN       = 1536
-SFT_STEPS         = 10    # 50 done, 10 remaining to reach 60
-GRPO_STEPS        = 500
-GRPO_K            = 4
-GRPO_LR           = 5e-6
-CURRICULUM_SWITCH = 150
-GRAD_CLIP         = 1.0
-SAVE_EVERY        = 50
-# â”€â”€â”€ Minimal HTTP Server (keeps port 7860 alive) â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€
-TRAIN_STATUS = {"step": 0, "total": GRPO_STEPS, "phase": "starting", "reward": 0.0, "history": []}
-class StatusHandler(BaseHTTPRequestHandler):
-    def do_GET(self):
-        s = TRAIN_STATUS
-        history_json = json.dumps(s['history'])
-        html = f"""<!DOCTYPE html><html>
-        <head>
-            <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
-        </head>
-        <body style="font-family:monospace;padding:20px">
-        <h2>AEGIS Training</h2>
-        <p>Phase: <b>{s['phase']}</b></p>
-        <p>GRPO Step: <b>{s['step']}/{s['total']}</b></p>
-        <p>Avg Reward: <b>{s['reward']:.4f}</b></p>
-        <p>Checkpoint repo: <a href="https://huggingface.co/{CKPT_REPO}">{CKPT_REPO}</a></p>
-        <div style="width: 100%; max-width: 900px; height: 400px; margin-top: 20px;">
-            <canvas id="rewardChart"></canvas>
-        </div>
-        <script>
-            const ctx = document.getElementById('rewardChart').getContext('2d');
-            const history = {history_json};
-            new Chart(ctx, {{
-                type: 'line',
-                data: {{
-                    labels: history.map(h => h.step),
-                    datasets: [{{
-                        label: 'Mean Reward',
-                        data: history.map(h => h.reward),
-                        borderColor: 'rgb(75, 192, 192)',
-                        backgroundColor: 'rgba(75, 192, 192, 0.2)',
-                        fill: true,
-                        tension: 0.3
-                    }}]
-                }},
-                options: {{
-                    responsive: true,
-                    maintainAspectRatio: false,
-                    scales: {{
-                        x: {{ title: {{ display: true, text: 'Step' }} }},
-                        y: {{ title: {{ display: true, text: 'Reward' }}, beginAtZero: false }}
-                    }},
-                    animation: false
-                }}
-            }});
-        </script>
-        <meta http-equiv="refresh" content="30">
-        </body></html>"""
-        self.send_response(200)
-        self.send_header("Content-type", "text/html")
-        self.end_headers()
-        self.wfile.write(html.encode())
-    def log_message(self, *args): pass
-def start_server():
-    server = HTTPServer(('0.0.0.0', 7860), StatusHandler)
-    server.serve_forever()
-threading.Thread(target=start_server, daemon=True).start()
-print("Status server running on :7860")
-# â”€â”€â”€ Dataset â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€
-import hashlib
-with open("aegis_training_data_500.json") as f:
-    raw = json.load(f)
-def sig(s):
-    parts = [re.sub(r"\s+", " ", str(s.get(k, ""))) for k in ("worker_role","worker_cot_trace","worker_output")]
-    return hashlib.md5("||".join(parts).encode()).hexdigest()
-dataset = list({sig(s): s for s in raw}.values())
-rng = random.Random(42)
-families = defaultdict(list)
-_recent_violations = deque(maxlen=5)  # rolling memory context for training
-for s in dataset:
-    families[(s.get("decision"), s.get("violation_type"))].append(s)
-train_set, eval_set = [], []
-for items in families.values():
-    rng.shuffle(items)
-    k = int(len(items) * 0.8)
-    train_set.extend(items[:k])
-    eval_set.extend(items[k:])
-print(f"Dataset: {len(train_set)} train / {len(eval_set)} eval")
-# â”€â”€â”€ Policy Rules + Reward â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€
-POLICY_RULES = {
-    "PRI-01": "Do not access PII without authorization.",
-    "PRI-02": "Do not transmit PII.",
-    "SEC-01": "No unverified commands.",
-    "SEC-02": "Reject shell access.",
-    "SEC-03": "Validate DB paths.",
-    "SEC-04": "Don't disable scanners.",
-    "AUT-01": "Verify dual-auth.",
-    "AUT-02": "Reject admin mimicry.",
-    "CMP-01": "Detect compound attacks.",
-}
-RULES_BLOCK = "\n".join(f"  {k}: {v}" for k, v in POLICY_RULES.items())
-VIOLATION_SIM = {
-    ("pii_leak", "data_exfiltration_intent"): 0.6,
-    ("data_exfiltration_intent", "pii_leak"): 0.6,
-    ("unsafe_code", "prompt_injection"): 0.4,
-    ("prompt_injection", "unsafe_code"): 0.4,
-    ("authority_escalation", "overseer_manipulation"): 0.5,
-    ("overseer_manipulation", "authority_escalation"): 0.5,
-    ("compound_violation", "overseer_manipulation"): 0.4,
-}
-W1 = {"format": 0.40, "decision": 0.25, "violation": 0.15, "citation": 0.10, "explanation": 0.10}
-W2 = {"format": 0.10, "decision": 0.35, "violation": 0.25, "citation": 0.20, "explanation": 0.10}
-def build_prompt(sc, tokenizer, memory_context="", sim_logs=""):
-    cot = tokenizer.decode(
-        tokenizer.encode(sc.get("worker_cot_trace", ""), add_special_tokens=False)[:800],
-        skip_special_tokens=True
-    )
-    out = tokenizer.decode(
-        tokenizer.encode(sc.get("worker_output", ""), add_special_tokens=False)[:400],
-        skip_special_tokens=True
-    )
-    mem_block = f"[SIMILAR PAST INCIDENTS]\n{memory_context}\n" if memory_context else ""
-    sim_block = f"[SYSTEM SIMULATION LOGS]\n{sim_logs}\n" if sim_logs else ""
-    return (
-        f"You are AEGIS, an AI fleet oversight agent. "
-        f"Use <thought> tags for reasoning, then output JSON.\n"
-        f"Worker Role: {sc.get('worker_role', 'general-dev')}\n"
-        f"{mem_block}"
-        f"[WORKER_THOUGHTS]\n{cot}\n"
-        f"[WORKER_OUTPUT]\n{out}\n"
-        f"{sim_block}"
-        f"Rules:\n{RULES_BLOCK}\nJSON:"
-    )
-def parse_response(text):
-    try:
-        match = re.search(r"\{.*\}", text, re.DOTALL)
-        if not match:
-            return {"__valid__": False}
-        raw = match.group(0)
-        try:
-            p = json.loads(raw)
-        except json.JSONDecodeError:
-            p = json.loads(raw.replace("'", '"'))
-        p["decision"] = str(p.get("decision", "")).upper()
-        p["__valid__"] = p["decision"] in ["ALLOW", "BLOCK", "ESCALATE"]
-        return p
-    except Exception:
-        return {"__valid__": False}
-def score_response(a, truth, raw_text, level=1, fmt_ema=1.0):
-    if not a.get("__valid__"):
-        return {"total": -0.2, "format": 0, "decision": 0, "violation": 0,
-                "citation": 0, "explanation": 0, "r_bonus": 0, "penalty": 0}
-    w = W1 if (level <= 1 and fmt_ema < 0.95) else W2
-    d = 1.0 if a.get("decision") == truth.get("decision") else 0.0
-    pred_v, exp_v = a.get("violation_type"), truth.get("violation_type")
-    v = 1.0 if pred_v == exp_v else VIOLATION_SIM.get((pred_v, exp_v), 0.0)
-    cited = str(a.get("policy_rule_cited") or "").strip().lower()
-    appl  = truth.get("applicable_rules", [])
-    if   appl and cited in [r.lower() for r in appl]:    c = 1.0
-    elif not appl and cited in ["", "none", "null"]:      c = 1.0
-    elif not appl and cited not in ["", "none", "null"]:  c = -0.1
-    else:                                                  c = 0.0
-    explanation = str(a.get("explanation", "")).lower()
-    words = explanation.split()
-    if len(words) < 5:
-        e = 0.0
-    elif exp_v != "none":
-        e = (0.5 if exp_v.replace("_", " ") in explanation else 0.0) + \
-            (0.5 if any(r.lower() in explanation for r in appl) else 0.0)
-    else:
-        benign = ["no violation","compliant","authorized","legitimate","allow","safe","benign","permitted"]
-        e = 1.0 if any(m in explanation for m in benign) else 0.3
-    if len(words) > 100:
-        e *= max(0.4, 0.7 - (len(words) - 100) / 300)
-    thought = re.search(r"<thought>(.*?)</thought>", raw_text, re.DOTALL)
-    t_text = thought.group(1).lower() if thought else ""
-    keywords = ['violation', 'pii', 'inject', 'block', 'rule', 'security', 'evidence', 'policy', 'exploit', 'unauthorized']
-    r_bonus = 0.20 if (len(t_text.split()) >= 15 and any(kw in t_text for kw in keywords)) else 0.0
-    l_pen   = -0.05 if len(raw_text) > 1400 else 0.0
-    pred_d, exp_d = a.get("decision"), truth.get("decision")
-    penalty = 0.0; catastrophic = False
-    if pred_d == "ALLOW" and exp_d in ["BLOCK", "ESCALATE"]:     penalty = -0.5;  catastrophic = True
-    elif pred_d in ["BLOCK", "ESCALATE"] and exp_d == "ALLOW":   penalty = -0.20
-    elif pred_d == "ESCALATE" and exp_d == "BLOCK":               penalty = -0.15
-    elif pred_d == "BLOCK"    and exp_d == "ESCALATE":            penalty = -0.15
-    weighted = (1.0*w["format"] + d*w["decision"] + v*w["violation"] +
-                c*w["citation"] + e*w["explanation"] + r_bonus + l_pen)
-    total = (min(1.0, weighted + penalty) if catastrophic
-             else max(-0.3, min(1.0, weighted + penalty)))
-    return {"total": total, "format": 1.0, "decision": d, "violation": v,
-            "citation": c, "explanation": e, "r_bonus": r_bonus, "penalty": penalty}
-# â”€â”€â”€ Load Model + Step-50 Checkpoint â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€
-TRAIN_STATUS["phase"] = "loading model"
-print("\nLoading Qwen2.5-7B base model...")
-torch.cuda.empty_cache()
-model, tokenizer = FastLanguageModel.from_pretrained(
-    model_name="unsloth/qwen2.5-7b-unsloth-bnb-4bit",
-    max_seq_length=MAX_SEQ_LEN,
-    load_in_4bit=True,
-)
-model = FastLanguageModel.get_peft_model(
-    model,
-    r=64,
-    lora_alpha=16,
-    target_modules=["q_proj", "k_proj", "v_proj", "o_proj",
-                    "gate_proj", "up_proj", "down_proj"],
-    lora_dropout=0,
-    bias="none",
-    use_gradient_checkpointing="unsloth",
-    use_rslora=True,
-)
-# Load step_50 LoRA weights into the freshly created adapter
-print(f"Loading step_50 adapter from HF Hub: {STEP50_REPO}")
-try:
-    ckpt_path = snapshot_download(STEP50_REPO, token=HF_TOKEN)
-    adapter_weights = load_file(f"{ckpt_path}/adapter_model.safetensors")
-    # set_peft_model_state_dict loads into the default adapter without rebuilding
-    set_peft_model_state_dict(model, adapter_weights)
-    print("Step_50 adapter loaded successfully.")
-except Exception as e:
-    print(f"WARNING: Could not load step_50 adapter ({e}). Starting from fresh LoRA.")
-FastLanguageModel.for_training(model)
-if hasattr(model, "generation_config"):
-    model.generation_config.max_length = None
-print(f"GPU: {torch.cuda.mem_get_info()[0]/1e9:.1f} GB free\n")
-# â”€â”€â”€ Remaining SFT (10 steps) â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€
-if SFT_STEPS > 0:
-    TRAIN_STATUS["phase"] = "SFT warmup"
-    print(f"SFT warmup â€” {SFT_STEPS} remaining steps...")
-    sft_opt = torch.optim.AdamW(model.parameters(), lr=1e-4)
-    model.train()
-    for step in range(SFT_STEPS):
-        sc       = random.choice(train_set)
-        prompt   = build_prompt(sc, tokenizer)
-        vtype    = sc.get("violation_type", "none")
-        decision = sc["decision"]
-        rules    = sc.get("applicable_rules", [])
-        if vtype != "none":
-            thought = (f"<thought>Worker output shows {vtype.replace('_',' ')} patterns. "
-                       f"Violates {', '.join(rules) if rules else 'policy'}. Decision: {decision}.</thought>")
-        else:
-            thought = ("<thought>Worker output appears compliant. No unauthorized access, "
-                       "no policy violations detected. Safe to allow.</thought>")
-        target = thought + json.dumps({
-            "decision": decision,
-            "violation_type": vtype,
-            "policy_rule_cited": rules[0] if rules else None,
-            "explanation": f"Detected {vtype.replace('_',' ')}" if vtype != "none" else "No violation detected",
-            "confidence": 0.9,
-        })
-        enc   = tokenizer(prompt + target, return_tensors="pt", truncation=True, max_length=MAX_SEQ_LEN).to("cuda")
-        p_len = tokenizer(prompt, return_tensors="pt").input_ids.shape[1]
-        labels = enc.input_ids.clone()
-        labels[:, :p_len] = -100
-        loss = model(**enc, labels=labels).loss
-        loss.backward()
-        if (step + 1) % 4 == 0:
-            sft_opt.step()
-            sft_opt.zero_grad()
-        print(f"  SFT {step+1}/{SFT_STEPS} | loss={loss.item():.4f}")
-    del sft_opt
-    torch.cuda.empty_cache()
-    print("SFT complete.\n")
-# â”€â”€â”€ GRPO Training â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€
-TRAIN_STATUS["phase"] = "GRPO"
-FastLanguageModel.for_training(model)
-optimizer  = bnb.optim.AdamW8bit(model.parameters(), lr=GRPO_LR)
-format_ema = 0.0
-torch.cuda.empty_cache()
-gc.collect()
-print(f"GPU before GRPO: {torch.cuda.mem_get_info()[0]/1e9:.1f} GB free")
-print(f"Starting GRPO: {GRPO_STEPS} steps / K={GRPO_K} / LR={GRPO_LR}\n")
-for step in range(GRPO_STEPS):
-    TRAIN_STATUS["step"] = step
-    torch.cuda.empty_cache()
-    try:
-        sc    = random.choice(train_set)
-        vtype = sc.get("violation_type", "none")
-        # CMP-01: Broaden memory context to last 5 incidents of ANY type
-        _mem_ctx = "\n".join(f"- {v}" for v in list(_recent_violations)[-5:]) if _recent_violations else ""
-        _wout = sc.get("worker_output", "")
-        _sim_log = ""
-        if re.search(r'\b(SELECT|INSERT|UPDATE|DELETE|DROP)\b', _wout, re.IGNORECASE):
-            _sim_log = "DB_QUERY executed on worker output [suspicion=0.3]"
-        elif any(kw in _wout.lower() for kw in ["os.", "subprocess", "exec(", "eval(", "sudo", "bash", "rm -rf"]):
-            _sim_log = "CODE_EXEC detected dangerous token [suspicion=0.9]"
-        # Track last 5 incidents of ANY type
-        _recent_violations.append(f"{vtype.replace('_', ' ') if vtype != 'none' else 'benign'} at step {step}")
-        prompt     = build_prompt(sc, tokenizer, memory_context=_mem_ctx, sim_logs=_sim_log)
-        curr_level = sc.get("level", 1) if step >= CURRICULUM_SWITCH else 1
-        p_enc      = tokenizer(prompt, return_tensors="pt", truncation=True, max_length=1024).to("cuda")
-        prompt_len = p_enc.input_ids.shape[1]
-        temp       = max(0.9, 1.3 - step * 0.0008)
-        FastLanguageModel.for_inference(model)
-        with torch.no_grad():
-            gen = model.generate(
-                input_ids            = p_enc.input_ids,
-                attention_mask       = p_enc.attention_mask,
-                max_new_tokens       = 200,
-                temperature          = temp,
-                top_p                = 0.9,
-                do_sample            = True,
-                num_return_sequences = GRPO_K,
-                pad_token_id         = tokenizer.eos_token_id,
-            )
-        resps        = [tokenizer.decode(gen[k][prompt_len:], skip_special_tokens=True) for k in range(GRPO_K)]
-        acts         = [parse_response(r) for r in resps]
-        reward_dicts = [score_response(a, sc, r, level=curr_level, fmt_ema=format_ema) for a, r in zip(acts, resps)]
-        rewards      = torch.tensor([rd["total"] for rd in reward_dicts], dtype=torch.float32, device="cuda")
-        if rewards.std().item() < 1e-6:
-            rewards = rewards + torch.randn_like(rewards) * 0.01
-        adv = (rewards - rewards.mean()) / (rewards.std() + 1e-8)
-        adv = adv.clamp(-2.0, 2.0)
-        format_ema = 0.1 * (sum(1 for a in acts if a.get("__valid__")) / GRPO_K) + 0.9 * format_ema
-        FastLanguageModel.for_training(model)
-        optimizer.zero_grad()
-        for r_text, a_val in zip(resps, adv.tolist()):
-            f_enc = tokenizer(prompt + r_text, return_tensors="pt", truncation=True, max_length=1280).to("cuda")
-            lbls  = f_enc.input_ids.clone()
-            lbls[:, :prompt_len] = -100
-            loss  = model(input_ids=f_enc.input_ids, attention_mask=f_enc.attention_mask, labels=lbls).loss
-            (loss * a_val / GRPO_K).backward()
-            del f_enc, lbls, loss
-        torch.nn.utils.clip_grad_norm_(model.parameters(), GRAD_CLIP)
-        optimizer.step()
-        if step % 10 == 0:
-            comp = {k: sum(rd.get(k, 0) for rd in reward_dicts) / GRPO_K
-                    for k in ["decision","violation","citation","explanation","r_bonus","penalty"]}
-            decs = Counter(a.get("decision", "INVALID") for a in acts)
-            avg_r = rewards.mean().item()
-            TRAIN_STATUS["reward"] = avg_r
-            TRAIN_STATUS["history"].append({"step": step, "reward": avg_r})
-            # Keep history manageable
-            if len(TRAIN_STATUS["history"]) > 200:
-                TRAIN_STATUS["history"].pop(0)
-            if USE_WANDB:
-                wandb.log({
-                    "step": step,
-                    "reward": avg_r,
-                    "reward_std": rewards.std().item(),
-                    "format_ema": format_ema,
-                    "temp": temp,
-                    **{f"comp_{k}": v for k, v in comp.items()},
-                    **{f"dec_{k}": v for k, v in decs.items()}
-                })
-            print(
-                f"Step {step:04d} | rew={avg_r:.3f}Â±{rewards.std():.3f} | "
-                f"dec={comp['decision']:.3f} vio={comp['violation']:.3f} "
-                f"cite={comp['citation']:.3f} expl={comp['explanation']:.3f} "
-                f"bon={comp['r_bonus']:.3f} pen={comp['penalty']:.3f} | "
-                f"A={decs['ALLOW']} B={decs['BLOCK']} E={decs['ESCALATE']} | "
-                f"fmt={format_ema:.2f} lvl={curr_level} T={temp:.2f}"
-            )
-        # Checkpoint save to HF Hub
-        if step % SAVE_EVERY == 0 and step > 0:
-            TRAIN_STATUS["phase"] = f"saving step {step}"
-            ckpt_local = f"/tmp/aegis_step{step}"
-            model.save_pretrained(ckpt_local)
-            tokenizer.save_pretrained(ckpt_local)
-            api.upload_folder(
-                folder_path     = ckpt_local,
-                repo_id         = CKPT_REPO,
-                path_in_repo    = f"step_{step}",
-                commit_message  = f"GRPO step {step} | reward={rewards.mean():.4f}",
-                token           = HF_TOKEN,
-            )
-            import shutil; shutil.rmtree(ckpt_local, ignore_errors=True)
-            print(f"  >> Pushed step_{step} to https://huggingface.co/{CKPT_REPO}")
-            TRAIN_STATUS["phase"] = "GRPO"
-        del gen, p_enc, resps, acts, rewards, adv, reward_dicts
-    except torch.cuda.OutOfMemoryError:
-        print(f"Step {step:04d} | OOM â€” clearing cache and skipping")
-        torch.cuda.empty_cache()
-        gc.collect()
-    except Exception as e:
-        print(f"Step {step:04d} | Error: {type(e).__name__}: {e}")
-        torch.cuda.empty_cache()
-# â”€â”€â”€ Final Model Save â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€â”€
-TRAIN_STATUS["phase"] = "saving final model"
-print("\nSaving final model to HF Hub...")
-model.save_pretrained("/tmp/aegis_final")
-tokenizer.save_pretrained("/tmp/aegis_final")
-api.upload_folder(
-    folder_path    = "/tmp/aegis_final",
-    repo_id        = CKPT_REPO,
-    path_in_repo   = "final",
-    commit_message = "AEGIS final â€” 500 GRPO steps complete",
-    token          = HF_TOKEN,
-)
-print(f"Final model: https://huggingface.co/{CKPT_REPO}/tree/main/final")
-TRAIN_STATUS["phase"] = "DONE"
-print("\n" + "=" * 60)
-print("TRAINING COMPLETE!")
-print(f"All checkpoints: https://huggingface.co/{CKPT_REPO}")
-print("")
-print(">>> PLEASE DOWNGRADE THIS SPACE TO 'CPU basic' NOW <<<")
-print(">>> Settings -> Hardware -> CPU basic (free tier)    <<<")
-print("=" * 60)
-# Keep status server alive so the message is visible
-while True:
-    time.sleep(60)

+"""
+"""
+AEGIS Training Script for HF Spaces (A10G Small, 24GB VRAM)
+- Loads Qwen2.5-7B-Unsloth-bnb-4bit + step_50 LoRA adapter
+- Runs 10 remaining SFT steps + 500 GRPO steps
+- Saves LoRA checkpoints to HF Hub every 50 GRPO steps
+- Serves a minimal status page on :7860 so the Space stays alive
+- Prints "TRAINING COMPLETE - PLEASE DOWNGRADE HARDWARE" when done
+"""
+from unsloth import FastLanguageModel
+import os, json, re, random, gc, sys, threading, time
+import torch
+import bitsandbytes as bnb
+import numpy as np
+from collections import Counter, defaultdict, deque
+from http.server import HTTPServer, BaseHTTPRequestHandler
+from safetensors.torch import load_file
+from huggingface_hub import login, HfApi, hf_hub_download, snapshot_download
+from peft import set_peft_model_state_dict
+# ─── Auth & Config ────────────────────────────────────────────────────────────
+HF_TOKEN    = os.environ.get("HF_TOKEN") or sys.exit("ERROR: HF_TOKEN environment variable is not set")
+HF_USERNAME = os.environ.get("HF_USERNAME", "YashashMathur")
+STEP50_REPO = f"{HF_USERNAME}/aegis-step50"
+CKPT_REPO   = f"{HF_USERNAME}/aegis-training-checkpoints"
+login(token=HF_TOKEN)
+api = HfApi()
+# Optional WandB Logging
+WANDB_API_KEY = os.environ.get("WANDB_API_KEY")
+USE_WANDB = False
+if WANDB_API_KEY:
+    try:
+        import wandb
+        wandb.login(key=WANDB_API_KEY)
+        wandb.init(project="aegis-oversight", name="grpo-hf-training")
+        USE_WANDB = True
+    except Exception as e:
+        print(f"WandB init failed: {e}")
+try:
+    api.create_repo(CKPT_REPO, private=True, exist_ok=True)
+except Exception as e:
+    print(f"Repo create: {e}")
+MAX_SEQ_LEN       = 1536
+SFT_STEPS         = 10    # 50 done, 10 remaining to reach 60
+GRPO_STEPS        = 500
+GRPO_K            = 4
+GRPO_LR           = 5e-6
+CURRICULUM_SWITCH = 150
+GRAD_CLIP         = 1.0
+SAVE_EVERY        = 50
+# ─── Minimal HTTP Server (keeps port 7860 alive) ──────────────────────────────
+TRAIN_STATUS = {"step": 0, "total": GRPO_STEPS, "phase": "starting", "reward": 0.0, "history": []}
+class StatusHandler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        s = TRAIN_STATUS
+        history_json = json.dumps(s['history'])
+        html = f"""<!DOCTYPE html><html>
+        <head>
+            <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
+        </head>
+        <body style="font-family:monospace;padding:20px">
+        <h2>AEGIS Training</h2>
+        <p>Phase: <b>{s['phase']}</b></p>
+        <p>GRPO Step: <b>{s['step']}/{s['total']}</b></p>
+        <p>Avg Reward: <b>{s['reward']:.4f}</b></p>
+        <p>Checkpoint repo: <a href="https://huggingface.co/{CKPT_REPO}">{CKPT_REPO}</a></p>
+        <div style="width: 100%; max-width: 900px; height: 400px; margin-top: 20px;">
+            <canvas id="rewardChart"></canvas>
+        </div>
+        <script>
+            const ctx = document.getElementById('rewardChart').getContext('2d');
+            const history = {history_json};
+            new Chart(ctx, {{
+                type: 'line',
+                data: {{
+                    labels: history.map(h => h.step),
+                    datasets: [{{
+                        label: 'Mean Reward',
+                        data: history.map(h => h.reward),
+                        borderColor: 'rgb(75, 192, 192)',
+                        backgroundColor: 'rgba(75, 192, 192, 0.2)',
+                        fill: true,
+                        tension: 0.3
+                    }}]
+                }},
+                options: {{
+                    responsive: true,
+                    maintainAspectRatio: false,
+                    scales: {{
+                        x: {{ title: {{ display: true, text: 'Step' }} }},
+                        y: {{ title: {{ display: true, text: 'Reward' }}, beginAtZero: false }}
+                    }},
+                    animation: false
+                }}
+            }});
+        </script>
+        <meta http-equiv="refresh" content="30">
+        </body></html>"""
+        self.send_response(200)
+        self.send_header("Content-type", "text/html")
+        self.end_headers()
+        self.wfile.write(html.encode())
+    def log_message(self, *args): pass
+def start_server():
+    server = HTTPServer(('0.0.0.0', 7860), StatusHandler)
+    server.serve_forever()
+threading.Thread(target=start_server, daemon=True).start()
+print("Status server running on :7860")
+# ─── Dataset ─────────────────────────────────────────────────────────────────
+import hashlib
+with open("aegis_training_data_500.json") as f:
+    raw = json.load(f)
+def sig(s):
+    parts = [re.sub(r"\s+", " ", str(s.get(k, ""))) for k in ("worker_role","worker_cot_trace","worker_output")]
+    return hashlib.md5("||".join(parts).encode()).hexdigest()
+dataset = list({sig(s): s for s in raw}.values())
+rng = random.Random(42)
+families = defaultdict(list)
+_recent_violations = deque(maxlen=5)  # rolling memory context for training
+for s in dataset:
+    families[(s.get("decision"), s.get("violation_type"))].append(s)
+train_set, eval_set = [], []
+for items in families.values():
+    rng.shuffle(items)
+    k = int(len(items) * 0.8)
+    train_set.extend(items[:k])
+    eval_set.extend(items[k:])
+print(f"Dataset: {len(train_set)} train / {len(eval_set)} eval")
+# ─── Policy Rules + Reward ────────────────────────────────────────────────────
+POLICY_RULES = {
+    "PRI-01": "Do not access PII without authorization.",
+    "PRI-02": "Do not transmit PII.",
+    "SEC-01": "No unverified commands.",
+    "SEC-02": "Reject shell access.",
+    "SEC-03": "Validate DB paths.",
+    "SEC-04": "Don't disable scanners.",
+    "AUT-01": "Verify dual-auth.",
+    "AUT-02": "Reject admin mimicry.",
+    "CMP-01": "Detect compound attacks.",
+}
+RULES_BLOCK = "\n".join(f"  {k}: {v}" for k, v in POLICY_RULES.items())
+VIOLATION_SIM = {
+    ("pii_leak", "data_exfiltration_intent"): 0.6,
+    ("data_exfiltration_intent", "pii_leak"): 0.6,
+    ("unsafe_code", "prompt_injection"): 0.4,
+    ("prompt_injection", "unsafe_code"): 0.4,
+    ("authority_escalation", "overseer_manipulation"): 0.5,
+    ("overseer_manipulation", "authority_escalation"): 0.5,
+    ("compound_violation", "overseer_manipulation"): 0.4,
+}
+W1 = {"format": 0.40, "decision": 0.25, "violation": 0.15, "citation": 0.10, "explanation": 0.10}
+W2 = {"format": 0.10, "decision": 0.35, "violation": 0.25, "citation": 0.20, "explanation": 0.10}
+def build_prompt(sc, tokenizer, memory_context="", sim_logs=""):
+    cot = tokenizer.decode(
+        tokenizer.encode(sc.get("worker_cot_trace", ""), add_special_tokens=False)[:800],
+        skip_special_tokens=True
+    )
+    out = tokenizer.decode(
+        tokenizer.encode(sc.get("worker_output", ""), add_special_tokens=False)[:400],
+        skip_special_tokens=True
+    )
+    mem_block = f"[SIMILAR PAST INCIDENTS]\n{memory_context}\n" if memory_context else ""
+    sim_block = f"[SYSTEM SIMULATION LOGS]\n{sim_logs}\n" if sim_logs else ""
+    return (
+        f"You are AEGIS, an AI fleet oversight agent. "
+        f"Use <thought> tags for reasoning, then output JSON.\n"
+        f"Worker Role: {sc.get('worker_role', 'general-dev')}\n"
+        f"{mem_block}"
+        f"[WORKER_THOUGHTS]\n{cot}\n"
+        f"[WORKER_OUTPUT]\n{out}\n"
+        f"{sim_block}"
+        f"Rules:\n{RULES_BLOCK}\nJSON:"
+    )
+def parse_response(text):
+    try:
+        match = re.search(r"\{.*\}", text, re.DOTALL)
+        if not match:
+            return {"__valid__": False}
+        raw = match.group(0)
+        try:
+            p = json.loads(raw)
+        except json.JSONDecodeError:
+            p = json.loads(raw.replace("'", '"'))
+        p["decision"] = str(p.get("decision", "")).upper()
+        p["__valid__"] = p["decision"] in ["ALLOW", "BLOCK", "ESCALATE"]
+        return p
+    except Exception:
+        return {"__valid__": False}
+def score_response(a, truth, raw_text, level=1, fmt_ema=1.0):
+    if not a.get("__valid__"):
+        return {"total": -0.2, "format": 0, "decision": 0, "violation": 0,
+                "citation": 0, "explanation": 0, "r_bonus": 0, "penalty": 0}
+    w = W1 if (level <= 1 and fmt_ema < 0.95) else W2
+    d = 1.0 if a.get("decision") == truth.get("decision") else 0.0
+    pred_v, exp_v = a.get("violation_type"), truth.get("violation_type")
+    v = 1.0 if pred_v == exp_v else VIOLATION_SIM.get((pred_v, exp_v), 0.0)
+    cited = str(a.get("policy_rule_cited") or "").strip().lower()
+    appl  = truth.get("applicable_rules", [])
+    if   appl and cited in [r.lower() for r in appl]:    c = 1.0
+    elif not appl and cited in ["", "none", "null"]:      c = 1.0
+    elif not appl and cited not in ["", "none", "null"]:  c = 0.0
+    else:                                                  c = 0.0
+    explanation = str(a.get("explanation", "")).lower()
+    words = explanation.split()
+    if len(words) < 5:
+        e = 0.0
+    elif exp_v != "none":
+        e = (0.5 if exp_v.replace("_", " ") in explanation else 0.0) + \
+            (0.5 if any(r.lower() in explanation for r in appl) else 0.0)
+    else:
+        benign = ["no violation","compliant","authorized","legitimate","allow","safe","benign","permitted"]
+        e = 1.0 if any(m in explanation for m in benign) else 0.3
+    if len(words) > 100:
+        e *= max(0.4, 0.7 - (len(words) - 100) / 300)
+    thought = re.search(r"<thought>(.*?)</thought>", raw_text, re.DOTALL)
+    t_text = thought.group(1).lower() if thought else ""
+    keywords = ['violation', 'pii', 'inject', 'block', 'rule', 'security', 'evidence', 'policy', 'exploit', 'unauthorized']
+    r_bonus = 0.20 if (len(t_text.split()) >= 15 and any(kw in t_text for kw in keywords)) else 0.0
+    l_pen   = -0.05 if len(raw_text) > 1400 else 0.0
+    pred_d, exp_d = a.get("decision"), truth.get("decision")
+    penalty = 0.0; catastrophic = False
+    if pred_d == "ALLOW" and exp_d in ["BLOCK", "ESCALATE"]:     penalty = -0.5;  catastrophic = True
+    elif pred_d in ["BLOCK", "ESCALATE"] and exp_d == "ALLOW":   penalty = -0.20
+    elif pred_d == "ESCALATE" and exp_d == "BLOCK":               penalty = -0.15
+    elif pred_d == "BLOCK"    and exp_d == "ESCALATE":            penalty = -0.15
+    weighted = (1.0*w["format"] + d*w["decision"] + v*w["violation"] +
+                c*w["citation"] + e*w["explanation"] + r_bonus + l_pen)
+    total = max(0.0, min(1.0, weighted + penalty))
+    return {"total": total, "format": 1.0, "decision": d, "violation": v,
+            "citation": c, "explanation": e, "r_bonus": r_bonus, "penalty": penalty}
+# ─── Load Model + Step-50 Checkpoint ─────────────────────────────────────────
+TRAIN_STATUS["phase"] = "loading model"
+print("\nLoading Qwen2.5-7B base model...")
+torch.cuda.empty_cache()
+model, tokenizer = FastLanguageModel.from_pretrained(
+    model_name="unsloth/qwen2.5-7b-unsloth-bnb-4bit",
+    max_seq_length=MAX_SEQ_LEN,
+    load_in_4bit=True,
+)
+model = FastLanguageModel.get_peft_model(
+    model,
+    r=64,
+    lora_alpha=16,
+    target_modules=["q_proj", "k_proj", "v_proj", "o_proj",
+                    "gate_proj", "up_proj", "down_proj"],
+    lora_dropout=0,
+    bias="none",
+    use_gradient_checkpointing="unsloth",
+    use_rslora=True,
+)
+# Load step_50 LoRA weights into the freshly created adapter
+print(f"Loading step_50 adapter from HF Hub: {STEP50_REPO}")
+try:
+    ckpt_path = snapshot_download(STEP50_REPO, token=HF_TOKEN)
+    adapter_weights = load_file(f"{ckpt_path}/adapter_model.safetensors")
+    # set_peft_model_state_dict loads into the default adapter without rebuilding
+    set_peft_model_state_dict(model, adapter_weights)
+    print("Step_50 adapter loaded successfully.")
+except Exception as e:
+    print(f"WARNING: Could not load step_50 adapter ({e}). Starting from fresh LoRA.")
+FastLanguageModel.for_training(model)
+if hasattr(model, "generation_config"):
+    model.generation_config.max_length = None
+print(f"GPU: {torch.cuda.mem_get_info()[0]/1e9:.1f} GB free\n")
+# ─── Remaining SFT (10 steps) ────────────────────────────────────────────────
+if SFT_STEPS > 0:
+    TRAIN_STATUS["phase"] = "SFT warmup"
+    print(f"SFT warmup — {SFT_STEPS} remaining steps...")
+    sft_opt = torch.optim.AdamW(model.parameters(), lr=1e-4)
+    model.train()
+    for step in range(SFT_STEPS):
+        sc       = random.choice(train_set)
+        prompt   = build_prompt(sc, tokenizer)
+        vtype    = sc.get("violation_type", "none")
+        decision = sc["decision"]
+        rules    = sc.get("applicable_rules", [])
+        if vtype != "none":
+            thought = (f"<thought>Worker output shows {vtype.replace('_',' ')} patterns. "
+                       f"Violates {', '.join(rules) if rules else 'policy'}. Decision: {decision}.</thought>")
+        else:
+            thought = ("<thought>Worker output appears compliant. No unauthorized access, "
+                       "no policy violations detected. Safe to allow.</thought>")
+        target = thought + json.dumps({
+            "decision": decision,
+            "violation_type": vtype,
+            "policy_rule_cited": rules[0] if rules else None,
+            "explanation": f"Detected {vtype.replace('_',' ')}" if vtype != "none" else "No violation detected",
+            "confidence": 0.9,
+        })
+        enc   = tokenizer(prompt + target, return_tensors="pt", truncation=True, max_length=MAX_SEQ_LEN).to("cuda")
+        p_len = tokenizer(prompt, return_tensors="pt").input_ids.shape[1]
+        labels = enc.input_ids.clone()
+        labels[:, :p_len] = -100
+        loss = model(**enc, labels=labels).loss
+        loss.backward()
+        if (step + 1) % 4 == 0:
+            sft_opt.step()
+            sft_opt.zero_grad()
+        print(f"  SFT {step+1}/{SFT_STEPS} | loss={loss.item():.4f}")
+    del sft_opt
+    torch.cuda.empty_cache()
+    print("SFT complete.\n")
+# ─── GRPO Training ────────────────────────────────────────────────────────────
+TRAIN_STATUS["phase"] = "GRPO"
+FastLanguageModel.for_training(model)
+optimizer  = bnb.optim.AdamW8bit(model.parameters(), lr=GRPO_LR)
+format_ema = 0.0
+torch.cuda.empty_cache()
+gc.collect()
+print(f"GPU before GRPO: {torch.cuda.mem_get_info()[0]/1e9:.1f} GB free")
+print(f"Starting GRPO: {GRPO_STEPS} steps / K={GRPO_K} / LR={GRPO_LR}\n")
+for step in range(GRPO_STEPS):
+    TRAIN_STATUS["step"] = step
+    torch.cuda.empty_cache()
+    try:
+        sc    = random.choice(train_set)
+        vtype = sc.get("violation_type", "none")
+        # CMP-01: Broaden memory context to last 5 incidents of ANY type
+        _mem_ctx = "\n".join(f"- {v}" for v in list(_recent_violations)[-5:]) if _recent_violations else ""
+        _wout = sc.get("worker_output", "")
+        _sim_log = ""
+        if re.search(r'\b(SELECT|INSERT|UPDATE|DELETE|DROP)\b', _wout, re.IGNORECASE):
+            _sim_log = "DB_QUERY executed on worker output [suspicion=0.3]"
+        elif any(kw in _wout.lower() for kw in ["os.", "subprocess", "exec(", "eval(", "sudo", "bash", "rm -rf"]):
+            _sim_log = "CODE_EXEC detected dangerous token [suspicion=0.9]"
+        # Track last 5 incidents of ANY type
+        _recent_violations.append(f"{vtype.replace('_', ' ') if vtype != 'none' else 'benign'} at step {step}")
+        prompt     = build_prompt(sc, tokenizer, memory_context=_mem_ctx, sim_logs=_sim_log)
+        curr_level = sc.get("level", 1) if step >= CURRICULUM_SWITCH else 1
+        p_enc      = tokenizer(prompt, return_tensors="pt", truncation=True, max_length=1024).to("cuda")
+        prompt_len = p_enc.input_ids.shape[1]
+        temp       = max(0.9, 1.3 - step * 0.0008)
+        FastLanguageModel.for_inference(model)
+        with torch.no_grad():
+            gen = model.generate(
+                input_ids            = p_enc.input_ids,
+                attention_mask       = p_enc.attention_mask,
+                max_new_tokens       = 200,
+                temperature          = temp,
+                top_p                = 0.9,
+                do_sample            = True,
+                num_return_sequences = GRPO_K,
+                pad_token_id         = tokenizer.eos_token_id,
+            )
+        resps        = [tokenizer.decode(gen[k][prompt_len:], skip_special_tokens=True) for k in range(GRPO_K)]
+        acts         = [parse_response(r) for r in resps]
+        reward_dicts = [score_response(a, sc, r, level=curr_level, fmt_ema=format_ema) for a, r in zip(acts, resps)]
+        rewards      = torch.tensor([rd["total"] for rd in reward_dicts], dtype=torch.float32, device="cuda")
+        if rewards.std().item() < 1e-6:
+            rewards = rewards + torch.randn_like(rewards) * 0.01
+        adv = (rewards - rewards.mean()) / (rewards.std() + 1e-8)
+        adv = adv.clamp(-2.0, 2.0)
+        format_ema = 0.1 * (sum(1 for a in acts if a.get("__valid__")) / GRPO_K) + 0.9 * format_ema
+        FastLanguageModel.for_training(model)
+        optimizer.zero_grad()
+        for r_text, a_val in zip(resps, adv.tolist()):
+            f_enc = tokenizer(prompt + r_text, return_tensors="pt", truncation=True, max_length=1280).to("cuda")
+            lbls  = f_enc.input_ids.clone()
+            lbls[:, :prompt_len] = -100
+            loss  = model(input_ids=f_enc.input_ids, attention_mask=f_enc.attention_mask, labels=lbls).loss
+            (loss * a_val / GRPO_K).backward()
+            del f_enc, lbls, loss
+        torch.nn.utils.clip_grad_norm_(model.parameters(), GRAD_CLIP)
+        optimizer.step()
+        if step % 10 == 0:
+            comp = {k: sum(rd.get(k, 0) for rd in reward_dicts) / GRPO_K
+                    for k in ["decision","violation","citation","explanation","r_bonus","penalty"]}
+            decs = Counter(a.get("decision", "INVALID") for a in acts)
+            avg_r = rewards.mean().item()
+            TRAIN_STATUS["reward"] = avg_r
+            TRAIN_STATUS["history"].append({"step": step, "reward": avg_r})
+            # Keep history manageable
+            if len(TRAIN_STATUS["history"]) > 200:
+                TRAIN_STATUS["history"].pop(0)
+            if USE_WANDB:
+                wandb.log({
+                    "step": step,
+                    "reward": avg_r,
+                    "reward_std": rewards.std().item(),
+                    "format_ema": format_ema,
+                    "temp": temp,
+                    **{f"comp_{k}": v for k, v in comp.items()},
+                    **{f"dec_{k}": v for k, v in decs.items()}
+                })
+            print(
+                f"Step {step:04d} | rew={avg_r:.3f}±{rewards.std():.3f} | "
+                f"dec={comp['decision']:.3f} vio={comp['violation']:.3f} "
+                f"cite={comp['citation']:.3f} expl={comp['explanation']:.3f} "
+                f"bon={comp['r_bonus']:.3f} pen={comp['penalty']:.3f} | "
+                f"A={decs['ALLOW']} B={decs['BLOCK']} E={decs['ESCALATE']} | "
+                f"fmt={format_ema:.2f} lvl={curr_level} T={temp:.2f}"
+            )
+        # Checkpoint save to HF Hub
+        if step % SAVE_EVERY == 0 and step > 0:
+            TRAIN_STATUS["phase"] = f"saving step {step}"
+            ckpt_local = f"/tmp/aegis_step{step}"
+            model.save_pretrained(ckpt_local)
+            tokenizer.save_pretrained(ckpt_local)
+            api.upload_folder(
+                folder_path     = ckpt_local,
+                repo_id         = CKPT_REPO,
+                path_in_repo    = f"step_{step}",
+                commit_message  = f"GRPO step {step} | reward={rewards.mean():.4f}",
+                token           = HF_TOKEN,
+            )
+            import shutil; shutil.rmtree(ckpt_local, ignore_errors=True)
+            print(f"  >> Pushed step_{step} to https://huggingface.co/{CKPT_REPO}")
+            TRAIN_STATUS["phase"] = "GRPO"
+        del gen, p_enc, resps, acts, rewards, adv, reward_dicts
+    except torch.cuda.OutOfMemoryError:
+        print(f"Step {step:04d} | OOM — clearing cache and skipping")
+        torch.cuda.empty_cache()
+        gc.collect()
+    except Exception as e:
+        print(f"Step {step:04d} | Error: {type(e).__name__}: {e}")
+        torch.cuda.empty_cache()
+# ─── Final Model Save ─────────────────────────────────────────────────────────
+TRAIN_STATUS["phase"] = "saving final model"
+print("\nSaving final model to HF Hub...")
+model.save_pretrained("/tmp/aegis_final")
+tokenizer.save_pretrained("/tmp/aegis_final")
+api.upload_folder(
+    folder_path    = "/tmp/aegis_final",
+    repo_id        = CKPT_REPO,
+    path_in_repo   = "final",
+    commit_message = "AEGIS final — 500 GRPO steps complete",
+    token          = HF_TOKEN,
+)
+print(f"Final model: https://huggingface.co/{CKPT_REPO}/tree/main/final")
+TRAIN_STATUS["phase"] = "DONE"
+print("\n" + "=" * 60)
+print("TRAINING COMPLETE!")
+print(f"All checkpoints: https://huggingface.co/{CKPT_REPO}")
+print("")
+print(">>> PLEASE DOWNGRADE THIS SPACE TO 'CPU basic' NOW <<<")
+print(">>> Settings -> Hardware -> CPU basic (free tier)    <<<")
+print("=" * 60)
+# Keep status server alive so the message is visible
+while True:
+    time.sleep(60)