During {HEAD ~ operation} as {TAIL ~ the solution} approaches a local minimum, because the error does not approach zero, the ratio of the error gradient to the norm squared of the error gradient will approach infinity causing the weights to jump in magnitude thus moving away from the local minimum 
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During { HEAD ~ operation } as { TAIL ~ the solution } approaches a local minimum , because the error does not approach zero , the ratio of the error gradient to the norm squared of the error gradient will approach infinity causing the weights to jump in magnitude thus moving away from the local minimum
OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH