def propagate(w, b, X, Y):

m = X.shape[1]

```
A = sigmoid(np.dot(w.T, X) + b)
cost = np.sum((( - np.log(A)) * Y + (-np.log(1 - A))*(1 - Y)) / (m)
dw = np.dot(X, (A-Y).T) / m
db = np.sum(A-Y)/ m
cost = np.squeeze(np.array(cost))
grads = {"dw": dw,
"db": db}
return grads, cost
```

output error →

File “”, line 42

dw = np.dot(X, (A-Y).T) / m

^

SyntaxError: invalid syntax

Check the brackets in the line upwards, cost, they dont match!

Sometimes it is confusing to me when to use matrix multiplication and when to use elementwise multiplication. I was using matrix multiplication to calculate the cost and I was getting inaccurate answers. I will reflect on my understanding. I know the difference is subtle

Can you please specify for which codes line your question pertains to?

you can mention in your comment if the code is not part of any grader cell.

Regards

DP