anchor.diff:  
     tfFeature = x: if x then "1" else "0";
   
  -  version = "2.3.0";
  +  version = "2.3.1";
     variant = if cudaSupport then "-gpu" else "";
     pname = "tensorflow${variant}";
   
  
positive.code:       owner = "tensorflow";
        repo = "tensorflow";
        rev = "v${version}";
        sha256 = "1dd5fgyiazyfy7y2iv4v42qnap51fr6dzwb26inrsj7aaas06j71";
      };
  
      patches = [
  
negative.code:       (fetchpatch {
          url = "https://github.com/tensorflow/tensorflow/commit/75ea0b31477d6ba9e990e296bbbd8ca4e7eebadf.patch";
          sha256 = "1xp1icacig0xm0nmb05sbrf4nw4xbln9fhc308birrv8286zx7wv";
        })
      ];
  
  