preprocessor_config.json

{
  "preprocessors": [
    {
      "type": "Lowercase"
    },
    {
      "type": "PreNFKC"
    },
    {
      "type": "PunctuationNormalization"
    },
    {
      "type": "WhitespaceNormalization"
    }
  ],
  "version": "1.1"
}