Understanding the latex for loss

I am having trouble following the loss expression as written

Shouldn’t the expression y^{(i)} be written as y[i] ?

after all it looks that way in code

loss =  -y[i] * np.log(f_wb) - (1 - y[i]) * np.log(1 - f_wb)

The mathematic notation uses superscripts.
The code uses vector indices. There’s no direct syntax for a superscript in python.

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