qing
cc2f7bca79
R1（可选开关，默认关，向后兼容）：
- --predict-delta：残差预测，target=Δ=a[t]-a[t-1]（归一化空间），
推理端 predict 自动加回 a_{t-1}（惯性先验平滑动作）
- --rollout-len K + --ss-prob：多步展开 + scheduled sampling，
首步真历史、后续步按概率用真历史或自预测回传（detach 截断），
治 exposure bias；dataset 多步样本返回 {steps:[...]}，自定义 collate
- 旧 checkpoint getattr 默认 False 兼容；pybot 闭环/部署链零改动
R4（新增 evaluate.py）：
- 留出 episode 开环滚动预测，复刻闭环口径（图像真值滚动、动作自预测回写）
- 5 个闭环代理指标：overall_mse/error_growth(发散)/error_curve/
smoothness_ratio(平滑)/oob_rate(越界，数据经验界 min/max+margin)
- 支持 --compare A/B 对比与 --output JSON 报告
- 端到端验证：正确捕捉开环发散(单步 MSE 盲区)与残差平滑收益
新增 17 用例（R1×10 + R4×7），全量 100 passed 无回归
288 lines
13 KiB
Python
288 lines
13 KiB
Python
import json
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import os
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import random
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import numpy as np
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import torch
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from torch.utils.data import DataLoader, Subset
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from tqdm import tqdm
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from config import (Config, build_argparser, apply_overrides,
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validate_config_values, warn_init_from_mismatch)
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from model import ActionPredictor
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from dataset import ActionDataset
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def split_episodes(data_dir: str, val_ratio: float, seed: int = 42):
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n = ActionDataset.get_episode_count(data_dir)
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indices = list(range(n))
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rng = np.random.RandomState(seed)
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rng.shuffle(indices)
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val_count = max(1, int(n * val_ratio))
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return indices[val_count:], indices[:val_count]
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def _collate(batch):
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"""多步样本（{"steps":[...]}）逐 k 聚合成 batch 列表；单步样本走默认 collate。
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rollout_len==1 时 __getitem__ 返回标准 dict，直接默认 collate；
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rollout_len>1 时返回 {"steps":[step_0..step_{K-1}]}，把每个 step_k 跨样本堆叠，
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返回 {"steps":[batch_0..batch_{K-1}]}，供 train_one_epoch 按步 scheduled sampling。
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"""
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from torch.utils.data._utils.collate import default_collate
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if batch and isinstance(batch[0], dict) and "steps" in batch[0]:
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k = len(batch[0]["steps"])
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return {"steps": [default_collate([b["steps"][i] for b in batch])
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for i in range(k)]}
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return default_collate(batch)
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def _shift_history(history: torch.Tensor, new_action: torch.Tensor) -> torch.Tensor:
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"""动作历史左移一步、追加 new_action 到末尾（scheduled sampling 回传自预测用）。
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history: (B, H, D)，new_action: (B, D) → (B, H, D)
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"""
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return torch.cat([history[:, 1:], new_action.unsqueeze(1)], dim=1)
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def train_one_epoch(model, loader, optimizer, device, max_grad_norm: float = None,
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rollout_len: int = 1, ss_prob: float = 1.0,
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predict_delta: bool = False):
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model.train()
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total_loss = 0.0
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count = 0
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rng = np.random.RandomState()
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for batch in tqdm(loader, desc=" train", leave=False):
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optimizer.zero_grad()
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if rollout_len == 1:
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images = batch["images"].to(device)
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history = batch["action_history"].to(device)
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target = batch["target"].to(device)
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pred = model(images, history)
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loss = torch.nn.functional.mse_loss(pred, target)
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bs = images.size(0)
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else:
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# 多步 scheduled sampling：首步必用真历史；后续步以 ss_prob 用真历史、
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# 否则用上一步模型预测（detach 截断，避免梯度跨步爆炸）回传构造历史。
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loss = 0.0
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bs = 0
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history = None
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for k, step in enumerate(batch["steps"]):
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images = step["images"].to(device)
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true_history = step["action_history"].to(device)
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target = step["target"].to(device)
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prev_action = step["prev_action"].to(device)
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if k == 0 or rng.random_sample() < ss_prob:
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history = true_history
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# 否则沿用上一轮回传的 history（自预测构造）
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pred = model(images, history)
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loss = loss + torch.nn.functional.mse_loss(pred, target)
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bs = images.size(0)
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# 回传：残差模式先把 Δ̂ 加回 a_{t-1} 得到绝对动作，再移入历史
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with torch.no_grad():
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abs_action = prev_action + pred if predict_delta else pred
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history = _shift_history(true_history, abs_action.detach())
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loss = loss / len(batch["steps"])
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loss.backward()
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if max_grad_norm:
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torch.nn.utils.clip_grad_norm_(model.parameters(), max_grad_norm)
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optimizer.step()
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total_loss += loss.item() * bs
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count += bs
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return total_loss / max(count, 1)
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@torch.no_grad()
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def validate(model, loader, device, rollout_len: int = 1, predict_delta: bool = False):
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model.eval()
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total_loss = 0.0
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count = 0
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for batch in tqdm(loader, desc=" val ", leave=False):
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if rollout_len == 1:
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images = batch["images"].to(device)
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history = batch["action_history"].to(device)
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target = batch["target"].to(device)
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pred = model(images, history)
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loss = torch.nn.functional.mse_loss(pred, target)
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bs = images.size(0)
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else:
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# 验证固定全真历史（确定性，不带 scheduled sampling 随机性），
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# 对 K 步累加，保证 best 模型选择口径稳定可比。
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loss = 0.0
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bs = 0
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for step in batch["steps"]:
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images = step["images"].to(device)
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history = step["action_history"].to(device)
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target = step["target"].to(device)
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pred = model(images, history)
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loss = loss + torch.nn.functional.mse_loss(pred, target)
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bs = images.size(0)
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loss = loss / len(batch["steps"])
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total_loss += loss.item() * bs
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count += bs
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if count == 0:
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return float("inf") # 空验证集不参与比较，避免假 best
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return total_loss / count
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def main():
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parser = build_argparser("actpred training")
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args = parser.parse_args()
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cfg = apply_overrides(Config(), args)
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validate_config_values(cfg.data, cfg.model, cfg.train)
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os.makedirs(cfg.train.checkpoint_dir, exist_ok=True)
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# 全局随机种子，保证训练可复现
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random.seed(cfg.train.seed)
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np.random.seed(cfg.train.seed)
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torch.manual_seed(cfg.train.seed)
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if torch.cuda.is_available():
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torch.cuda.manual_seed_all(cfg.train.seed)
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device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
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print(f"Device: {device}")
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train_indices, val_indices = split_episodes(
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cfg.data.data_dir, cfg.train.val_split, seed=cfg.train.seed)
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print(f"Episodes: {len(train_indices)} train, {len(val_indices)} val")
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train_ds = ActionDataset(
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cfg.data.data_dir, cfg.data.history_len, cfg.data.action_dim,
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cfg.data.image_width, cfg.data.image_height, cfg.data.normalize_actions,
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cfg.data.action_stats_path, train_indices, cfg.data.frame_len,
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augment=cfg.train.augment,
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predict_delta=cfg.train.predict_delta, rollout_len=cfg.train.rollout_len)
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if cfg.data.normalize_actions and not cfg.data.action_stats_path:
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# 归一化统计量必须只用训练集计算，再供验证集复用，否则 val loss 不可信
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stats_path = os.path.join(cfg.train.checkpoint_dir, "action_stats.npy")
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np.save(stats_path, train_ds.get_action_stats())
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print(f"Action stats saved to: {stats_path}")
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# 只存裸文件名：推理端按 checkpoint 目录解析相对路径
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cfg.data.action_stats_path = "action_stats.npy"
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val_ds = ActionDataset(
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cfg.data.data_dir, cfg.data.history_len, cfg.data.action_dim,
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cfg.data.image_width, cfg.data.image_height, cfg.data.normalize_actions,
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cfg.data.action_stats_path, val_indices, cfg.data.frame_len,
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predict_delta=cfg.train.predict_delta, rollout_len=cfg.train.rollout_len)
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print(f"Samples: {len(train_ds)} train, {len(val_ds)} val")
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if len(train_ds) == 0:
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raise ValueError(
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f"训练集为空（0 样本）。请检查 data_dir={cfg.data.data_dir} "
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f"及 episode 数据完整性。")
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if len(val_ds) == 0:
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print("WARNING: validation set is empty (episodes too short/few); "
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"model selection is disabled, last epoch will be saved.")
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loader_gen = torch.Generator()
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loader_gen.manual_seed(cfg.train.seed)
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train_loader = DataLoader(train_ds, batch_size=cfg.train.batch_size,
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shuffle=True, num_workers=cfg.train.num_workers,
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generator=loader_gen, collate_fn=_collate)
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val_loader = DataLoader(val_ds, batch_size=cfg.train.batch_size,
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shuffle=False, num_workers=cfg.train.num_workers,
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collate_fn=_collate)
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model = ActionPredictor(cfg.model, cfg.data).to(device)
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n_params = sum(p.numel() for p in model.parameters())
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print(f"Model params: {n_params:,}")
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if args.init_from:
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init_ckpt = torch.load(args.init_from, map_location="cpu", weights_only=True)
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warn_init_from_mismatch(init_ckpt.get("config", {}), cfg)
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missing, unexpected = model.load_state_dict(
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init_ckpt["model_state_dict"], strict=False)
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if missing:
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print(f" init-from missing keys: {missing}")
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if unexpected:
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print(f" init-from unexpected keys: {unexpected}")
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print(f"Loaded pretrained weights from: {args.init_from}")
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optimizer = torch.optim.AdamW(model.parameters(), lr=cfg.train.lr,
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weight_decay=cfg.train.weight_decay)
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scheduler = torch.optim.lr_scheduler.CosineAnnealingLR(optimizer, T_max=cfg.train.epochs)
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best_val_loss = float("inf")
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patience_counter = 0
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start_epoch = 1
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best_path = os.path.join(cfg.train.checkpoint_dir, "best.pt")
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last_path = os.path.join(cfg.train.checkpoint_dir, "last.pt")
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if args.resume:
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resume_ckpt = torch.load(args.resume, map_location=device, weights_only=True)
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model.load_state_dict(resume_ckpt["model_state_dict"])
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optimizer.load_state_dict(resume_ckpt["optimizer_state_dict"])
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scheduler.load_state_dict(resume_ckpt["scheduler_state_dict"])
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start_epoch = resume_ckpt["epoch"] + 1
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best_val_loss = resume_ckpt.get("best_val_loss", float("inf"))
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patience_counter = resume_ckpt.get("patience_counter", 0)
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print(f"Resumed from {args.resume} at epoch {start_epoch} "
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f"(best_val_loss={best_val_loss:.6f})")
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for epoch in range(start_epoch, cfg.train.epochs + 1):
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print(f"\nEpoch {epoch}/{cfg.train.epochs} lr={optimizer.param_groups[0]['lr']:.6f}")
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train_loss = train_one_epoch(model, train_loader, optimizer, device,
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cfg.train.max_grad_norm,
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rollout_len=cfg.train.rollout_len,
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ss_prob=cfg.train.ss_prob,
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predict_delta=cfg.train.predict_delta)
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val_loss = validate(model, val_loader, device,
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rollout_len=cfg.train.rollout_len,
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predict_delta=cfg.train.predict_delta)
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scheduler.step()
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print(f" train_loss={train_loss:.6f} val_loss={val_loss:.6f}")
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if val_loss < best_val_loss:
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best_val_loss = val_loss
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patience_counter = 0
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torch.save({
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"epoch": epoch,
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"model_state_dict": model.state_dict(),
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"optimizer_state_dict": optimizer.state_dict(),
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"val_loss": val_loss,
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"config": cfg.to_dict(),
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}, best_path)
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inference_path = os.path.join(cfg.train.checkpoint_dir, "best_inference.pt")
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torch.save({
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"model_state_dict": model.state_dict(),
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"config": cfg.to_dict(),
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}, inference_path)
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print(f" -> saved best (val_loss={val_loss:.6f})")
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else:
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patience_counter += 1
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if patience_counter >= cfg.train.patience:
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print(f"\nEarly stopping at epoch {epoch} (patience={cfg.train.patience})")
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break
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# 每 epoch 保存 last.pt，支持 --resume 断点续训
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torch.save({
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"epoch": epoch,
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"model_state_dict": model.state_dict(),
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"optimizer_state_dict": optimizer.state_dict(),
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"scheduler_state_dict": scheduler.state_dict(),
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"best_val_loss": best_val_loss,
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"patience_counter": patience_counter,
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"config": cfg.to_dict(),
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}, last_path)
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print(f"\nTraining done. Best val_loss={best_val_loss:.6f}")
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if best_val_loss == float("inf"):
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# 验证集为空时无 best 可选，保底保存最终权重
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torch.save({
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"model_state_dict": model.state_dict(),
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"config": cfg.to_dict(),
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}, os.path.join(cfg.train.checkpoint_dir, "best_inference.pt"))
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print("WARNING: saved final weights as best_inference.pt (no valid validation loss)")
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else:
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print(f"Best model saved to: {best_path}")
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if args.save_config:
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with open(args.save_config, "w") as f:
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json.dump(cfg.to_dict(), f, indent=2, ensure_ascii=False)
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print(f"Config saved to: {args.save_config}")
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if __name__ == "__main__":
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main()
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