Function evaluate 

pub fn evaluate<F, P, Data>(evals: &FieldBuffer<P, Data>, point: &[F]) -> F
where
    F: Field,
    P: PackedField<Scalar = F>,
    Data: Deref<Target = [P]>,

Evaluates a multilinear polynomial at a point, leaving the coefficients in place.

The point holds one coordinate per variable. The result is a single field element. Memory used is on the order of the square root of the coefficient count.

Preconditions

• the point must hold one coordinate per variable of the polynomial