I keep getting a syntax error here. Every time I address one, another crops up$.$ First the colon after then w$,$ then b$.$ Maybe I haven't had enough coffee yet today, but I$\text{'}$m at a loss as to what's going on$.$ Any suggestions?

In $[45]$: M def perceptron$($xs$,$ ys$)$:

$"""$

function w$=$perceptron$($xs$,$ys$)$;

Returns the weight vector learned by the Perceptron classifier.

Input:

xs : n input vectors of d dimensions $($nxd matrix$)$

ys : n labels $(-1$ or $+1)$

Output:

w : weight vector $($d$)$

b : bias term

$"""$

n$,$ d $=$ xs$.$shape # so we have n input vectors, of d dimensions each

w $=$ np$.$zeros$($d$)$

b $=0\mathrm{.}0$

max$\_$iterations $=100$

for iteration in range$($max$\_$iterations$)$:

indices $=$ np$.$random.permutation$($n$)$

xs $=$ xs$[$indices$]$

ys $=$ ys$[$indices$]$

converged $=$ True

for i in range$($n$)$:

if ys$[$i$]*($np$.$dot$($w$,$ xs$[$i$]+$ b:

w $+=$ ys$[$i$]*$xs$[$i$]$

b $+=$ ys$[$i$]$

converged $=$ False

if converged:

break

return w$,$ b

raise NotImplementedError$()$

File $"",$ line $28$

if ys$[$i$]*($np$.$dot$($w$,$ xs$[$i$]+$ b:

$^$

SyntaxError: invalid syntax