fix: 修OOM — load_model预计算改流式只加载测试用户+直接逐item算(不建Dataset)+算完释放
评测异常根因:load_model全量load_sample_files与评测自身数据双倍内存OOM。 改:_load_test_user_items流式过滤(仅测试用户~1.5M)、build_rep_cache直接从item_dict 逐item算(省掉user_items~8GB拷贝)、算完del+gc。bench加--eval-precompute本地真跑 load_model这条路验证不OOM。 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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OwnerSunshine530
+79
-27
@@ -720,31 +720,82 @@ class CTRModel(nn.Module):
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# RepEncoder 预计算缓存
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# ============================================================
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def build_rep_cache(model, item_dict, user_seq, test_logids_ordered,
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max_feasign_per_slot, device, batch_users=200):
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"""预计算所有 item 的 RepEncoder 向量（context-free），按 logid 排序存入 model._rep_cache。
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def _load_test_user_items(ds_dir):
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"""流式只加载"测试用户"的 item（避免全量 OOM）。返回 item_dict（仅测试用户）。"""
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test_csv = ds_dir / "test.csv"
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history = ds_dir / "history"
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test_users = set()
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with open(test_csv) as f:
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for line in f:
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line = line.strip()
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if not line:
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continue
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parts = line.split(",")
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if len(parts) >= 2:
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test_users.add(int(parts[1]))
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files = (sorted(history.glob("*.csv")) if history.exists() else []) + [test_csv]
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item_dict = {}
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for fp in files:
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has_clk = _detect_has_clk(fp)
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min_parts = 5 if has_clk else 4
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with open(fp) as f:
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for line in f:
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line = line.strip()
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if not line:
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continue
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parts = line.split(",")
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if len(parts) < min_parts:
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continue
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if int(parts[1]) not in test_users:
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continue
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logid = int(parts[0])
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fs = 5 if has_clk else 4
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signs, slots = [], []
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for pair in parts[fs:]:
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if ":" in pair:
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s, sl = pair.split(":", 1)
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signs.append(int(s))
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slots.append(int(sl))
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item_dict[logid] = {
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"signs": np.array(signs, dtype=np.int64),
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"slots": np.array(slots, dtype=np.int64),
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}
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return item_dict
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复用 CTRTestSeqDataset + collate + model.rep_encoder，保证与 model(batch) 内的
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RepEncoder 输出逐位一致。注意：必须用与评测端一致的 max_feasign_per_slot（基线为 {1:2}），
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否则缓存的 item 向量与 batch 实际特征不符。
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def build_rep_cache(model, item_dict, max_feasign_per_slot, device, chunk=4000, max_slot_id=28):
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"""直接从 item_dict 逐 item 预计算 RepEncoder 向量（不建 CTRTestSeqDataset，省内存）。
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每个 item 作为一个 segment，逐 slot 拼 values/offsets，跑 model.rep_encoder，
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与 model(batch) 内的 RepEncoder 输出逐位一致。必须用与评测端一致的
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max_feasign_per_slot（基线 {1:2}），否则缓存向量与 batch 实际特征不符。
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"""
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ds = CTRTestSeqDataset(
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test_logids_ordered=test_logids_ordered, item_dict=item_dict,
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user_seq=user_seq, max_feasign_per_slot=max_feasign_per_slot, max_ctx_len=None)
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loader = DataLoader(ds, batch_size=batch_users, shuffle=False, num_workers=0,
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collate_fn=make_collate_fn(ds.max_slot_id))
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logid_chunks, emb_chunks = [], []
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logids_sorted = sorted(item_dict.keys())
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emb_chunks = []
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model.eval()
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with torch.inference_mode():
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for batch in loader:
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batch = move_batch_to_device(batch, device)
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rep = model.rep_encoder(batch) # [num_tokens, d_model]
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logid_chunks.append(batch["logid"].to(device))
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emb_chunks.append(rep)
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logids = torch.cat(logid_chunks)
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for i in range(0, len(logids_sorted), chunk):
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cl = logids_sorted[i:i + chunk]
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slot_vals = {s: [] for s in range(1, max_slot_id + 1)}
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slot_offs = {s: [0] for s in range(1, max_slot_id + 1)}
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for lid in cl:
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rec = item_dict[lid]
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by = defaultdict(list)
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for s, sl in zip(rec["signs"].tolist(), rec["slots"].tolist()):
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by[sl].append(s)
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for slot in range(1, max_slot_id + 1):
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ss = by.get(slot, [])
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if max_feasign_per_slot and max_feasign_per_slot.get(slot, -1) != -1:
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ss = ss[:max_feasign_per_slot[slot]]
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slot_vals[slot].extend(ss)
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slot_offs[slot].append(len(slot_vals[slot]))
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batch = {slot: (torch.tensor(slot_vals[slot], dtype=torch.long, device=device),
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torch.tensor(slot_offs[slot], dtype=torch.long, device=device))
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for slot in range(1, max_slot_id + 1)}
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emb_chunks.append(model.rep_encoder(batch)) # [len(cl), d_model]
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logids = torch.tensor(logids_sorted, dtype=torch.long, device=device) # 已有序
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emb = torch.cat(emb_chunks)
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order = torch.argsort(logids)
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model._rep_cache = (logids[order].contiguous(), emb[order].contiguous())
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model._rep_cache = (logids.contiguous(), emb.contiguous())
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return model._rep_cache
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@@ -840,13 +891,14 @@ def load_model(ckpt_path, device='cuda:0'):
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ds_dir = cand
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break
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if ds_dir is not None:
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history = ds_dir / "history"
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test_csv = ds_dir / "test.csv"
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files = (sorted(history.glob("*.csv")) if history.exists() else []) + [test_csv]
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item_dict, user_seq = load_sample_files(files)
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test_logids = list(load_logids_from_file(test_csv))
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build_rep_cache(model, item_dict, user_seq, test_logids, {1: 2}, dev)
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print(f"[INFO] rep cache built: {model._rep_cache[0].numel()} items")
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# 流式只加载测试用户的 item（避免全量 OOM），算完即释放
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item_dict = _load_test_user_items(ds_dir)
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build_rep_cache(model, item_dict, {1: 2}, dev)
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n_items = model._rep_cache[0].numel()
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del item_dict
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import gc
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gc.collect()
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print(f"[INFO] rep cache built (stream-filtered): {n_items} items")
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else:
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print("[INFO] dataset/ not found, skip rep precompute (fallback to in-batch)")
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except Exception as e:
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