{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "FAMM Hessian Curvature Receipt",
  "type": "object",
  "required": [
    "receipt_type",
    "schema_version",
    "basis_layer",
    "operator",
    "lanczos",
    "route_decision",
    "receipt_sha256"
  ],
  "properties": {
    "receipt_type": {
      "const": "famm_hessian_curvature_receipt"
    },
    "schema_version": {
      "type": "string"
    },
    "basis_layer": {
      "const": "HESSIAN_EIGEN"
    },
    "seed": {
      "type": "integer"
    },
    "operator": {
      "type": "object",
      "required": [
        "kind",
        "size",
        "dtype",
        "device"
      ],
      "properties": {
        "kind": {
          "type": "string"
        },
        "size": {
          "type": "integer",
          "minimum": 1
        },
        "dtype": {
          "type": "string"
        },
        "device": {
          "type": "string"
        }
      }
    },
    "lanczos": {
      "type": "object",
      "required": [
        "k",
        "iterations",
        "eigenvalues",
        "ritz_residuals",
        "converged"
      ],
      "properties": {
        "k": {
          "type": "integer",
          "minimum": 1
        },
        "iterations": {
          "type": "integer",
          "minimum": 1
        },
        "eigenvalues": {
          "type": "array",
          "items": {
            "type": "number"
          }
        },
        "ritz_residuals": {
          "type": "array",
          "items": {
            "type": "number"
          }
        },
        "converged": {
          "type": "array",
          "items": {
            "type": "boolean"
          }
        }
      }
    },
    "trace": {
      "anyOf": [
        {
          "type": "null"
        },
        {
          "type": "object",
          "properties": {
            "estimate": {
              "type": "number"
            },
            "stderr": {
              "type": [
                "number",
                "null"
              ]
            },
            "samples_sha256": {
              "type": "string"
            }
          }
        }
      ]
    },
    "spectral_density": {
      "anyOf": [
        {
          "type": "null"
        },
        {
          "type": "object",
          "properties": {
            "sigma": {
              "type": "number"
            },
            "grid_sha256": {
              "type": "string"
            },
            "density_sha256": {
              "type": "string"
            },
            "raw_eigenvalues_sha256": {
              "type": "string"
            },
            "raw_weights_sha256": {
              "type": "string"
            }
          }
        }
      ]
    },
    "route_decision": {
      "type": "object"
    },
    "no_drift_boundary": {
      "type": "string"
    },
    "receipt_sha256": {
      "type": "string"
    }
  }
}