env_type.hpp

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#ifndef MLPACK_METHODS_RL_ENVIRONMENT_ENV_TYPE_HPP
#define MLPACK_METHODS_RL_ENVIRONMENT_ENV_TYPE_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace rl {

class DiscreteActionEnv
{
 public:
  class State
  {
   public:
    State() : data(dimension)
    { /* Nothing to do here. */ }

    State(const arma::colvec& data) : data(data)
    { /* Nothing to do here */ }

    arma::colvec& Data() { return data; }

    const arma::colvec& Encode() const { return data; }

    static size_t dimension;

   private:
    arma::colvec data;
  };

  class Action
  {
   public:
    // To store the action.
    size_t action = 0;
    // Track the size of the action space.
    static size_t size;
  };

  double Sample(const State& /* state */,
                const Action& /* action */,
                State& /* nextState*/)
  { return 0; }

  State InitialSample() { return State(); }
  bool IsTerminal(const State& /* state */) const { return false; }
};
size_t DiscreteActionEnv::State::dimension = 0;
size_t DiscreteActionEnv::Action::size = 0;

class ContinuousActionEnv
{
 public:
  class State
  {
   public:
    State() : data(dimension)
    { /* Nothing to do here. */ }

    State(const arma::colvec& data) : data(data)
    { /* Nothing to do here */ }

    arma::colvec& Data() { return data; }

    const arma::colvec& Encode() const { return data; }

    static size_t dimension;

   private:
    arma::colvec data;
  };

  class Action
  {
   public:
    std::vector<double> action;
    // Storing degree of freedom.
    static size_t size;

    Action() : action(ContinuousActionEnv::Action::size)
    { /* Nothing to do here */ }
  };

  double Sample(const State& /* state */,
                const Action& /* action */,
                State& /* nextState*/)
  { return 0; }

  State InitialSample() { return State(); }
  bool IsTerminal(const State& /* state */) const { return false; }
};
size_t ContinuousActionEnv::State::dimension = 0;
size_t ContinuousActionEnv::Action::size = 0;

} // namespace rl
} // namespace mlpack

#endif