section Linear Classification: is there difference between the comma(,) and semi-colon(;) in the functions?

[xuweichn]

the linear classifier:
$$ f(x_i, W, b) = W x_i + b $$ ---- commer in the middle of x_i and W

the Multiclass SVM loss:
$$ L = \frac{1}{N} \sum_i \sum_{j\neq y_i} \left[ \max(0, f(x_i; W)j - f(x_i; W){y_i} + \Delta) \right] + \lambda \sum_k\sum_l W_{k,l}^2 $$ ----- semicolon in the middle of x_i and W

Is there any difference introduced by the two punctruations?