I am struggling solving this exercise. I have implemented what should be the right steps. I cannot get past a Wrong Masked Weights error. I would greatly appreciate guidance:

```
AssertionError Traceback (most recent call last)
<ipython-input-118-00665b20febb> in <module>
1 # UNIT TEST
----> 2 scaled_dot_product_attention_test(scaled_dot_product_attention)
~/work/W4A1/public_tests.py in scaled_dot_product_attention_test(target)
73 assert np.allclose(weights, [[0.30719590187072754, 0.5064803957939148, 0.0, 0.18632373213768005],
74 [0.3836517333984375, 0.3836517333984375, 0.0, 0.2326965481042862],
---> 75 [0.3836517333984375, 0.3836517333984375, 0.0, 0.2326965481042862]]), "Wrong masked weights"
76 assert np.allclose(attention, [[0.6928040981292725, 0.18632373213768005],
77 [0.6163482666015625, 0.2326965481042862],
AssertionError: Wrong masked weights
```