If performance does not improve, at 130 {HEAD ~ the step size} is reduced by {TAIL ~ a reduction factor} β, 0<β1 
is reduced by
If performance does not improve , at 130 { HEAD ~ the step size } is reduced by { TAIL ~ a reduction factor } β , 0 < β1
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH