TODO: implement the cost function

The squared error cost function is

12=1((())())2=12=1(0+1()())2.12i=1m(h(x(i))y(i))2=12i=1m(0+1x(i)y(i))2.

*Note: the superscript of i represents the iteration number, not the expontent.

Open the file gd.py and implement cost_function. Then run this cell to test it out.

In [ ]:

print(cost_function(x, y, 0, 1)) # should print 104.772951994

print(cost_function(x, y, 2, -1)) # should print 744.953822077

print(cost_function(x, y, -1, 2)) # should print 14.090816198