def test_backprop_121():
print('\n=== test_backprop_121 ===')
_nn_like.bias(0)
_nn_like.nn_like([1, 2, 1])
_nn_like.fixed_weights(1.2, 1.0)
o_before = _nn_like.forward_deterministic([1])[0]
_nn_like.backprop_deterministic([o_before], [0.6], 1.0)
o_after = _nn_like.forward_deterministic([1])[0]
print(o_before, o_after)
assert 0.55 < o_after < 0.65
def test_backprop_111_neg_input():
print('\n=== test_backprop_111_neg_input ===')
_nn_like.bias(0)
_nn_like.nn_like([1, 1, 1])
_nn_like.fixed_weights(1.2, 1.0)
o_before = _nn_like.forward_deterministic([-2])[0]
_nn_like.backprop_deterministic([o_before], [-0.6], 1.0)
o_after = _nn_like.forward_deterministic([-2])[0]
print(o_before, o_after)
assert -0.65 < o_after < 0.55