MLSoftplusOptions constructor
      
      MLSoftplusOptions({ 
    
    
- double? steepness,
Implementation
factory MLSoftplusOptions({double? steepness}) =>
    MLSoftplusOptions._(steepness: steepness ?? 1);factory MLSoftplusOptions({double? steepness}) =>
    MLSoftplusOptions._(steepness: steepness ?? 1);