bs.h

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/*
Copyright (c) by respective owners including Yahoo!, Microsoft, and
individual contributors. All rights reserved.  Released under a BSD
license as described in the file LICENSE.
 */
#pragma once
#include <memory>
#define BS_TYPE_MEAN 0
#define BS_TYPE_VOTE 1

struct rand_state;

LEARNER::base_learner* bs_setup(VW::config::options_i& options, vw& all);

namespace BS
{
inline uint32_t weight_gen(std::shared_ptr<rand_state>& state)  // sampling from Poisson with rate 1
{
  float temp = state->get_and_update_random();
  if (temp <= 0.3678794411714423215955)
    return 0;
  if (temp <= 0.735758882342884643191)
    return 1;
  if (temp <= 0.919698602928605803989)
    return 2;
  if (temp <= 0.9810118431238461909214)
    return 3;
  if (temp <= 0.9963401531726562876545)
    return 4;
  if (temp <= 0.9994058151824183070012)
    return 5;
  if (temp <= 0.9999167588507119768923)
    return 6;
  if (temp <= 0.9999897508033253583053)
    return 7;
  if (temp <= 0.9999988747974020309819)
    return 8;
  if (temp <= 0.9999998885745216612793)
    return 9;
  if (temp <= 0.9999999899522336243091)
    return 10;
  if (temp <= 0.9999999991683892573118)
    return 11;
  if (temp <= 0.9999999999364022267287)
    return 12;
  if (temp <= 0.999999999995480147453)
    return 13;
  if (temp <= 0.9999999999996999989333)
    return 14;
  if (temp <= 0.9999999999999813223654)
    return 15;
  if (temp <= 0.9999999999999989050799)
    return 16;
  if (temp <= 0.9999999999999999393572)
    return 17;
  if (temp <= 0.999999999999999996817)
    return 18;
  if (temp <= 0.9999999999999999998412)
    return 19;
  return 20;
}
}  // namespace BS