{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://huggingface.co/schemas/dataset.json",
  "title": "Hugging Face Dataset",
  "description": "Schema for a dataset hosted on the Hugging Face Hub, including metadata, structure, splits, and repository information.",
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "_id": {
      "type": "string",
      "description": "Internal unique identifier for the dataset"
    },
    "id": {
      "type": "string",
      "description": "Dataset repository ID in the format author/dataset-name or dataset-name",
      "examples": [
        "squad",
        "glue",
        "mozilla-foundation/common_voice_17_0",
        "tatsu-lab/alpaca"
      ]
    },
    "author": {
      "type": "string",
      "description": "Author or organization that owns the dataset"
    },
    "sha": {
      "type": "string",
      "description": "Latest Git commit SHA of the dataset repository",
      "pattern": "^[0-9a-f]{40}$"
    },
    "lastModified": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp of the last modification"
    },
    "createdAt": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the dataset was created"
    },
    "private": {
      "type": "boolean",
      "description": "Whether the dataset is private",
      "default": false
    },
    "disabled": {
      "type": "boolean",
      "description": "Whether the dataset has been disabled",
      "default": false
    },
    "gated": {
      "oneOf": [
        {
          "type": "boolean"
        },
        {
          "type": "string",
          "enum": [
            "auto",
            "manual"
          ]
        }
      ],
      "description": "Access gating configuration"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Tags associated with the dataset"
    },
    "downloads": {
      "type": "integer",
      "description": "Number of downloads in the last 30 days",
      "minimum": 0
    },
    "likes": {
      "type": "integer",
      "description": "Number of likes/favorites",
      "minimum": 0
    },
    "description": {
      "type": "string",
      "description": "Short description of the dataset"
    },
    "citation": {
      "type": "string",
      "description": "Citation text for the dataset (BibTeX format)"
    },
    "siblings": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "rfilename": {
            "type": "string",
            "description": "Relative file path within the repository"
          },
          "size": {
            "type": "integer",
            "description": "File size in bytes"
          },
          "blobId": {
            "type": "string",
            "description": "Git blob ID"
          },
          "lfs": {
            "type": "object",
            "properties": {
              "sha256": {
                "type": "string"
              },
              "size": {
                "type": "integer"
              },
              "pointerSize": {
                "type": "integer"
              }
            }
          }
        }
      },
      "description": "Files in the dataset repository"
    },
    "cardData": {
      "type": "object",
      "description": "Parsed metadata from the dataset card YAML front matter",
      "properties": {
        "language": {
          "oneOf": [
            {
              "type": "string"
            },
            {
              "type": "array",
              "items": {
                "type": "string"
              }
            }
          ],
          "description": "Language(s) of the dataset"
        },
        "license": {
          "oneOf": [
            {
              "type": "string"
            },
            {
              "type": "array",
              "items": {
                "type": "string"
              }
            }
          ],
          "description": "License identifier(s)",
          "examples": [
            "apache-2.0",
            "mit",
            "cc-by-4.0",
            "cc-by-sa-4.0"
          ]
        },
        "multilinguality": {
          "type": "array",
          "items": {
            "type": "string",
            "enum": [
              "monolingual",
              "multilingual",
              "translation",
              "other"
            ]
          }
        },
        "size_categories": {
          "type": "array",
          "items": {
            "type": "string",
            "enum": [
              "n<1K",
              "1K<n<10K",
              "10K<n<100K",
              "100K<n<1M",
              "1M<n<10M",
              "10M<n<100M",
              "100M<n<1B",
              "1B<n<10B",
              "n>10B"
            ]
          },
          "description": "Size category of the dataset"
        },
        "task_categories": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Task categories the dataset supports",
          "examples": [
            [
              "text-classification",
              "question-answering",
              "summarization",
              "translation",
              "text-generation"
            ]
          ]
        },
        "task_ids": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Specific task IDs (more granular than task_categories)"
        },
        "paperswithcode_id": {
          "type": "string",
          "description": "Papers With Code dataset identifier"
        },
        "pretty_name": {
          "type": "string",
          "description": "Human-readable display name"
        },
        "configs": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "config_name": {
                "type": "string",
                "description": "Configuration/subset name"
              },
              "data_files": {
                "oneOf": [
                  {
                    "type": "string"
                  },
                  {
                    "type": "array",
                    "items": {
                      "type": "object",
                      "properties": {
                        "split": {
                          "type": "string"
                        },
                        "path": {
                          "oneOf": [
                            {
                              "type": "string"
                            },
                            {
                              "type": "array",
                              "items": {
                                "type": "string"
                              }
                            }
                          ]
                        }
                      }
                    }
                  }
                ],
                "description": "Data file locations for this config"
              },
              "default": {
                "type": "boolean",
                "description": "Whether this is the default configuration"
              }
            }
          },
          "description": "Dataset loading configurations"
        },
        "dataset_info": {
          "oneOf": [
            {
              "$ref": "#/$defs/DatasetInfoEntry"
            },
            {
              "type": "array",
              "items": {
                "$ref": "#/$defs/DatasetInfoEntry"
              }
            }
          ],
          "description": "Detailed structural information about the dataset"
        },
        "train-eval-index": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "config": {
                "type": "string"
              },
              "task": {
                "type": "string"
              },
              "task_id": {
                "type": "string"
              },
              "splits": {
                "type": "object"
              },
              "col_mapping": {
                "type": "object"
              },
              "metrics": {
                "type": "array",
                "items": {
                  "type": "object"
                }
              }
            }
          },
          "description": "AutoTrain evaluation configuration"
        }
      }
    }
  },
  "$defs": {
    "DatasetInfoEntry": {
      "type": "object",
      "properties": {
        "config_name": {
          "type": "string",
          "description": "Configuration name"
        },
        "features": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/Feature"
          },
          "description": "Dataset feature (column) definitions"
        },
        "splits": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "name": {
                "type": "string",
                "description": "Split name (e.g., train, test, validation)"
              },
              "num_bytes": {
                "type": "integer",
                "description": "Size of the split in bytes"
              },
              "num_examples": {
                "type": "integer",
                "description": "Number of examples in the split"
              }
            }
          },
          "description": "Data splits"
        },
        "download_size": {
          "type": "integer",
          "description": "Total download size in bytes"
        },
        "dataset_size": {
          "type": "integer",
          "description": "Total dataset size in bytes (uncompressed)"
        }
      }
    },
    "Feature": {
      "type": "object",
      "properties": {
        "name": {
          "type": "string",
          "description": "Feature/column name"
        },
        "dtype": {
          "type": "string",
          "description": "Data type (e.g., string, int32, float64, bool)",
          "examples": [
            "string",
            "int32",
            "int64",
            "float32",
            "float64",
            "bool"
          ]
        },
        "struct": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/Feature"
          },
          "description": "Nested struct fields"
        },
        "sequence": {
          "oneOf": [
            {
              "type": "string"
            },
            {
              "$ref": "#/$defs/Feature"
            }
          ],
          "description": "Sequence element type"
        },
        "class_label": {
          "type": "object",
          "properties": {
            "names": {
              "type": "object",
              "additionalProperties": {
                "type": "string"
              },
              "description": "Mapping from integer labels to string names"
            }
          },
          "description": "Class label metadata"
        },
        "_type": {
          "type": "string",
          "description": "Internal type identifier",
          "enum": [
            "Value",
            "ClassLabel",
            "Sequence",
            "Image",
            "Audio",
            "Translation",
            "TranslationVariableLanguages",
            "Array2D",
            "Array3D",
            "Array4D",
            "Array5D"
          ]
        }
      }
    }
  }
}