{
  "columns": {
    "ceiling_series": {
      "dtype": "float32",
      "semantics": "training-normalized predictability proxy"
    },
    "lagged_vol": {
      "dtype": "float32",
      "semantics": "causal 24-row trailing cross-sectional volatility"
    },
    "regime": {
      "dtype": "int8",
      "semantics": "training-threshold calm or stress indicator"
    },
    "row_index": {
      "dtype": "int64",
      "semantics": "global chronological row index"
    },
    "timestamp": {
      "dtype": "int64",
      "semantics": "UTC Unix timestamp in seconds"
    },
    "valid": {
      "dtype": "fixed_size_list<bool>[1000]",
      "semantics": "pre-fill validity mask"
    },
    "values": {
      "dtype": "fixed_size_list<float32>[1000]",
      "semantics": "target cross-section"
    },
    "xs_vol": {
      "dtype": "float32",
      "semantics": "cross-sectional population standard deviation"
    }
  },
  "format": "finance1k-hf-parquet-v1",
  "row_granularity": "one timestamp and one synchronized 1,000-ticker cross-section",
  "ticker_axis": "values[j] and valid[j] correspond to selection_order j in metadata/tickers.parquet"
}