Function shannon_entropy_bits_kernel 

pub fn shannon_entropy_bits_kernel<R>(
    probs: &CausalTensor<R>,
) -> Result<R, PhysicsError>
where
    R: RealField + FromPrimitive + MaybeParallel + Sum,

Shannon entropy in bits, without renormalizing the probabilities. Rejects empty input, negative probabilities and non-finite entries.