text: #pragma once
  
  #include <absl/types/optional.h>
  
  #include "chainerx/array.h"
  #include "chainerx/axes.h"
  
  namespace chainerx {
  
  Array AMax(const Array& a, const OptionalAxes& axis = absl::nullopt, bool keepdims = false);
  
  Array AMin(const Array& a, const OptionalAxes& axis = absl::nullopt, bool keepdims = false);
  
  Array Mean(const Array& a, const OptionalAxes& axis = absl::nullopt, bool keepdims = false);
  
  Array Var(const Array& a, const OptionalAxes& axis = absl::nullopt, bool keepdims = false);
  
  }  // namespace chainerx
  