{
  "algo": "ngram",
  "algo_params": {
    "min_gram": 1,
    "max_gram": 3
  },
  "out": "hash",
  "out_params": {
    "num_features": 128
  },
  "format_wide": true,
  "id_cols": [2,1],
  "tokenize_col": 3
}