schrodinger.kernel.Bernoulli.scala Maven / Gradle / Ivy
/*
* Copyright 2021 Arman Bilge
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package schrodinger.kernel
import algebra.ring.Semifield
import cats.Functor
import cats.kernel.Order
import cats.syntax.all.*
import schrodinger.math.syntax.*
trait FairBernoulli[F[_], B]:
def fairBernoulli: F[B]
object FairBernoulli:
given [F[_]: Functor: Random]: FairBernoulli[F, Boolean] with
def fairBernoulli = Random.int.map(_ >= 0)
trait Bernoulli[F[_], P, B]:
def bernoulli(successProbability: P): F[B]
object Bernoulli:
inline def apply[F[_], P, B](successProbability: P)(using b: Bernoulli[F, P, B]): F[B] =
b.bernoulli(successProbability)
inline def fair[F[_], B](using b: FairBernoulli[F, B]): F[B] = b.fairBernoulli
given [F[_]: Functor, P: Order](using Uniform[F, P]): Bernoulli[F, P, Boolean] with
def bernoulli(successProbability: P) = Uniform.standard.map(_ < successProbability)