[tmva] add missing members initializer in TGradientDescent
[tmva] add missing members initializer in TGradientDescent
olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root