exp(dagger-deploy): 轮次19——APG 修复两个既有 bug（_cat_gaps in-place、段边界 queue.detach 无梯度）后可跑，但碰撞铰链尺度失控（40万）且与部署形态不一致，暂不采用；转反馈蒸馏

2026-10-20 07:56:58 +08:00
parent 5675159987
commit ff160f576e
3 changed files with 18 additions and 2 deletions
@@ -131,7 +131,8 @@ class Kin:
    def _cat_gaps(parts, starts):
        out = {'gm': torch.cat([p.pop('gm') for p in parts], 0)}
        if 'b' in parts[0]:
-            for p, s in zip(parts, starts): p['b'] += s
+            # 非 in-place：b 会被 autograd 的索引反向图引用（APG 的碰撞铰链梯度路径），+= 会让 backward 报 version 错
+            for p, s in zip(parts, starts): p['b'] = p['b'] + s
            for k in ('b', 'i', 'j', 'gap'): out[k] = torch.cat([p.pop(k) for p in parts])   # 逐键拼、拼完即释放
        return out