Parameters are injected into the command by replacing the {parameters} placeholder. Good examples of parameters would be “learning rate” number or “network layout” string.

A parameter in parameters has six potential properties:

  • name: the parameter name, shown on the user interface and used as the default name when passed to commands
  • type: the parameter type, valid values are float, integer, string and flag
  • pass-as: (optional) how the parameter is passed to the command e.g. -t {v} where {v} becomes the actual value. If not defined, the parameter is passed as --{name}={value}. Note: Type ‘flag’ defaults to ‘–{name}’.
  • description: (optional) more detailed human-readable description of the parameter
  • default: (optional) the default value of the parameter
  • optional: (optional) marks that this input is optional and the value can be left undefined. Note: has no effect for the type ‘flag’.


When a value is undefined, the parameter will appear with it’s default value, except for the type flag. Flags will only ever appear, if they are defined with value set to true.