`array([[ 0.10651613],
   [ 0.11501053],
   [ 0.11034159],
   [ 0.11213908],
   [ 0.10754446],
   [ 0.09952921],
   [ 0.10827382],
   [ 0.11763775],
   [ 0.10538466],
   [ 0.10562691]])

def relu(x):
    return x * (x > 0)

def relu_diff(x):
    return x > 0