{HEAD ~ This functional dependence} of η allows {TAIL ~ the learning rate} to change adaptively with the error E 
allows
{ HEAD ~ This functional dependence } of η allows { TAIL ~ the learning rate } to change adaptively with the error E
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH