correct val for BFGS, overflow in N-M, 92 iterations not 14

w_start = np.random.rand(*w_exact.shape)
%timeit w_found = minimize(obj,w_start,method = 'Nelder-Mead', args=(x_rand,y))
%timeit w_foundA = minimize(obj,w_start,method = 'BFGS', args=(x_rand,y),jac=obj_gradA)
%timeit w_foundB = minimize(obj,w_start,method = 'BFGS', args=(x_rand,y),jac=obj_gradA)
%timeit w_foundC = minimize(obj,w_start,method = 'BFGS', args=(x_rand,y),jac=obj_gradA)

print ('exact val', w_exact)
print (w_found.x, w_found.nfev)
print (w_foundA.x, w_foundA.nfev)
print (w_foundB.x, w_foundB.nfev)
print (w_foundC.x, w_foundC.nfev)
C:\ProgramData\Anaconda3\lib\site-packages\ipykernel\__main__.py:2: RuntimeWarning: overflow encountered in exp
  from ipykernel import kernelapp as app
100 loops, best of 3: 9.66 ms per loop
10 loops, best of 3: 32.9 ms per loop
10 loops, best of 3: 31 ms per loop
10 loops, best of 3: 30.5 ms per loop
exact val [5 3]
[  1563.51123254  12680.20486013] 165
[ 5.24224     3.15977342] 92
[ 5.24224     3.15977342] 92
[ 5.24224     3.15977342] 92