anchor.diff:  , mock
   , backports_weakref
   , zlib
  +, tensorflow-tensorboard
   }:
   
   assert cudaSupport -> cudatoolkit != null
  
positive.code:             url = tfurl "linux" "gpu" "cp27-none-linux_x86_64";
              sha256 = "10yyyn4g2fsv1xgmw99bbr0fg7jvykay4gb5pxrrylh7h38h6wah";
            };
            py3 = {
              url = tfurl "linux" "gpu" "cp36-cp36m-linux_x86_64";
              sha256 = "12g3akkr083gs3sisjbmm0lpsk8phn3dvy7jjfadfxshqc7za14i";
            };
  
negative.code:   version = "1.3.0";
    name = "${pname}-${version}";
    format = "wheel";
    disabled = ! (isPy35 || isPy36 || isPy27);
  
    src = let
        tfurl = sys: proc: pykind:
  