{
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              "$ref": "#/definitions/gbtree_model_param"
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                  "split_conditions",
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              "items": {
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              }
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            "trees",
            "tree_info"
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      "required": [
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      "required": [
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      "properties": {
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        "size_leaf_vector"
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    "reg_loss_param": {
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      "properties": {
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          "type": "string"
        }
      }
    },
    "aft_loss_param": {
      "type": "object",
      "properties": {
        "aft_loss_distribution": {
          "type": "string"
        },
        "aft_loss_distribution_scale": {
          "type": "string"
        }
      }
    },
    "softmax_multiclass_param": {
      "type": "object",
      "properties": {
        "num_class": { "type": "string" }
      }
    },
    "lambda_rank_param": {
      "type": "object",
      "properties": {
        "num_pairsample": { "type": "string" },
        "fix_list_weight": { "type": "string" }
      }
    }
  },
  "type": "object",
  "properties": {
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      "items": [
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          "const": 1
        },
        {
          "type": "number",
          "minimum": 0
        },
        {
          "type": "number",
          "minimum": 0
        }
      ],
      "minItems": 3,
      "maxItems": 3
    },
    "learner": {
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      "properties": {
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              "$ref": "#/definitions/gbtree"
            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "gblinear" },
                "model": {
                  "type": "object",
                  "properties": {
                    "weights": {
                      "type": "array",
                      "items": {
                        "type": "number"
                      }
                    }
                  }
                }
              }
            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "dart" },
                "gbtree": {
                  "$ref": "#/definitions/gbtree"
                },
                "weight_drop": {
                  "type": "array",
                  "items": {
                    "type": "number"
                  }
                }
              },
              "required": [
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                "gbtree",
                "weight_drop"
              ]
            }
          ]
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        "objective": {
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              "properties": {
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                "reg_loss_param": { "$ref": "#/definitions/reg_loss_param"}
              },
              "required": [
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                "reg_loss_param"
              ]
            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "reg:pseudohubererror" },
                "reg_loss_param": { "$ref": "#/definitions/reg_loss_param"}
              },
              "required": [
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                "reg_loss_param"
              ]
            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "reg:squaredlogerror" },
                "reg_loss_param": { "$ref": "#/definitions/reg_loss_param"}
              },
              "required": [
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                "reg_loss_param"
              ]
            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "reg:linear" },
                "reg_loss_param": { "$ref": "#/definitions/reg_loss_param"}
              },
              "required": [
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                "reg_loss_param"
              ]
            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "reg:logistic" },
                "reg_loss_param": { "$ref": "#/definitions/reg_loss_param"}
              },
              "required": [
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                "reg_loss_param"
              ]
            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "binary:logistic" },
                "reg_loss_param": { "$ref": "#/definitions/reg_loss_param"}
              },
              "required": [
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              ]
            },
            {
              "type": "object",
              "properties": {
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                "reg_loss_param": { "$ref": "#/definitions/reg_loss_param"}
              },
              "required": [
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                "reg_loss_param"
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            },

            {
              "type": "object",
              "properties": {
                "name": { "const": "count:poisson" },
                "poisson_regression_param": {
                  "type": "object",
                  "properties": {
                    "max_delta_step": { "type": "string" }
                  }
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              },
              "required": [
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            {
              "type": "object",
              "properties": {
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                "tweedie_regression_param": {
                  "type": "object",
                  "properties": {
                    "tweedie_variance_power": { "type": "string" }
                  }
                }
              },
              "required": [
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                "tweedie_regression_param"
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            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "survival:cox" }
              },
              "required": [ "name" ]
            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "reg:gamma" }
              },
              "required": [ "name" ]
            },

            {
              "type": "object",
              "properties": {
                "name": { "const": "multi:softprob" },
                "softmax_multiclass_param": { "$ref": "#/definitions/softmax_multiclass_param"}
              },
              "required": [
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                "softmax_multiclass_param"
              ]
            },
            {
              "type": "object",
              "properties": {
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                "softmax_multiclass_param": { "$ref": "#/definitions/softmax_multiclass_param"}
              },
              "required": [
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                "softmax_multiclass_param"
              ]
            },

            {
              "type": "object",
              "properties": {
                "name": { "const": "rank:pairwise" },
                "lambda_rank_param": { "$ref": "#/definitions/lambda_rank_param"}
              },
              "required": [
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                "lambda_rank_param"
              ]
            },
            {
              "type": "object",
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                "lambda_rank_param": { "$ref": "#/definitions/lambda_rank_param"}
              },
              "required": [
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              ]
            },
            {
              "type": "object",
              "properties": {
                "name": { "const": "rank:map" },
                "lambda_rank_param": { "$ref": "#/definitions/lambda_rank_param"}
              },
              "required": [
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                "lambda_rank_param"
              ]
            },
            {
              "type": "object",
              "properties": {
                "name": {"const": "survival:aft"},
                "aft_loss_param": { "$ref": "#/definitions/aft_loss_param"}
              }
            },
            {
              "type": "object",
              "properties": {
                "name": {"const": "binary:hinge"}
              }
            }
          ]
        },

        "learner_model_param": {
          "type": "object",
          "properties": {
            "base_score": { "type": "string" },
            "num_class": { "type": "string" },
            "num_feature": { "type": "string" }
          }
        }
      },
      "required": [
        "gradient_booster",
        "objective"
      ]
    }
  },
  "required": [
    "version",
    "learner"
  ]
}
