)]}'
{
  "commit": "1c9fb46cc2ff410262dafdc533cc5837fb76e156",
  "tree": "23e6de157bca98d0930c1aa3a5d3601daf55a814",
  "parents": [
    "0b629bd8964a81a5a900974bc158da5520d8678c"
  ],
  "author": {
    "name": "Sameer Agarwal",
    "email": "sameeragarwal@google.com",
    "time": "Mon Oct 19 16:55:37 2026 -0700"
  },
  "committer": {
    "name": "Sameer Agarwal",
    "email": "sameeragarwal@google.com",
    "time": "Mon Oct 19 18:24:52 2026 -0700"
  },
  "message": "Add FAQ on why CostFunctions should not return the norm of residuals\n\nExplain why returning ||r(x)|| or ||r(x)||^2 from a CostFunction collapses the Gauss-Newton Hessian to rank 1 and causes non-differentiability or singular Jacobians at r(x) \u003d 0.\n\nFixes https://github.com/ceres-solver/ceres-solver/issues/467\n\nChange-Id: Id5437c724b414069e4788b8e363785a9976bd018\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "b6cafcfce193bebca79e2ced45eb2679eaf2cfdc",
      "old_mode": 33188,
      "old_path": "docs/source/modeling_faqs.rst",
      "new_id": "13d4b7dfa9139a74b72e500ed50dc769fe56c1a2",
      "new_mode": 33188,
      "new_path": "docs/source/modeling_faqs.rst"
    }
  ]
}