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{"type":"item.completed","item":{"id":"item_2","type":"agent_message","text":"```python\nimport numpy as np,json\nnames=[f\"L{k}.{s}\" for k in range(1,7) for s in (\"W\",\"b\")]+[\"out.W\",\"out.b\"]\nnp.savez_compressed(\"/work/version_18.npz\",**{n:load(n) for n in names})\n\nrevision=r'''\nimport numpy as np\n_base={}\nexec(open(\"/work/design_v13.py\").read(),_base)\ndef construct(parameters=None):\n    changes=dict(exact_triangle_cost=3.0)\n    if parameters:\n        changes.update(parameters)\n    t,p=_base[\"construct\"](changes)\n    W=t[\"L6.W\"]; b=t[\"L6.b\"]; O=t[\"out.W\"]\n    old_quiet_W=W[:,243:324].copy()\n    old_quiet_b=b[243:324].copy()\n\n    pool=list(range(243,324))+list(range(487,512))\n    W[:,pool]=0\n    b[pool]=0\n    O[pool,:]=0\n\n    # A 2x2 square containing three friendly stones identifies exactly\n    # the redundant empty-triangle move at its remaining empty vertex.\n    # Occupied vertices are removed by the supplied legal-move mask.\n    cursor=0\n    for r in range(8):\n        for c in range(8):\n            hidden=pool[cursor];cursor+=1\n            square=[9*r+c,9*r+c+1,9*(r+1)+c,9*(r+1)+c+1]\n            b[hidden]=-2.0\n            for j in square:\n                W[j,hidden]=1.0\n                O[hidden,j]=-p[\"scale\"]*p[\"exact_triangle_cost\"]\n\n    # Retain narrow-territory protection on every boundary point,\n    # where filling a two-point eye is especially dangerous.\n    for i in range(81):\n        r,c=divmod(i,9)\n        if min(r,c,8-r,8-c)!=0:\n            continue\n        hidden=pool[cursor];cursor+=1\n        W[:,hidden]=old_quiet_W[:,i]\n        b[hidden]=old_quiet_b[i]\n        O[hidden,i]=-p[\"scale\"]*p[\"quiet_fill\"]\n    assert cursor==96\n    return t,p\n'''\nopen(\"/work/design_v19.py\",\"w\").write(revision)\nns={}\nexec(revision,ns)\nt,p=ns[\"construct\"]()\nfor n,a in t.items():\n    assert np.isfinite(a).all()\n    save(n,a)\njson.dump(p,open(\"/work/parameters.json\",\"w\"),indent=2)\nprint(\"Saved revision 19: exact 2x2 empty-triangle detectors,\")\nprint(\"without penalizing unrelated opposite-side connections.\")\nprint(\"Boundary eye protection and all tactical channels are retained.\")\n```\n"}}
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