Remove place hash

test=develop

paddle/fluid/memory/allocation/allocator_facade.cc

@@ -193,8 +193,7 @@ class CUDAPinnedManagedAllocator : public ChunkedManagedAllocator {
 
 class AllocatorFacadePrivate {
  public:
-  std::unordered_map<platform::Place, std::shared_ptr<ManagedAllocator>>
-      allocators_;
+  std::map<platform::Place, std::shared_ptr<ManagedAllocator>> allocators_;
 
   ~AllocatorFacadePrivate() = default;
 

paddle/fluid/platform/place.h

@@ -131,65 +131,5 @@ typename Visitor::result_type VisitPlace(const Place &place,
   return boost::apply_visitor(PlaceVisitorWrapper<Visitor>(visitor), place);
 }
 
-struct PlaceHashVisitor : public boost::static_visitor<size_t> {
-  template <typename Place>
-  inline size_t operator()(const Place &place) const {
-    return place.hash();
-  }
-};
-
 }  // namespace platform
 }  // namespace paddle
-
-namespace std {
-
-template <>
-struct hash<::paddle::platform::CPUPlace> {
-  using argument_type = ::paddle::platform::CPUPlace;
-  using result_type = size_t;
-
-  constexpr inline result_type operator()(const argument_type &place) const {
-    return static_cast<result_type>(-1);
-  }
-};
-
-template <>
-struct hash<::paddle::platform::CUDAPlace> {
-  using argument_type = ::paddle::platform::CUDAPlace;
-  using result_type = size_t;
-
-  inline result_type operator()(const argument_type &place) const {
-    return static_cast<result_type>(place.device);
-  }
-};
-
-template <>
-struct hash<::paddle::platform::CUDAPinnedPlace> {
-  using argument_type = ::paddle::platform::CUDAPinnedPlace;
-  using result_type = size_t;
-
-  constexpr inline result_type operator()(const argument_type &place) const {
-    return static_cast<result_type>(-2);
-  }
-};
-
-namespace {  // NOLINT
-struct PlaceHashVisitor : public boost::static_visitor<size_t> {
-  template <typename Place>
-  inline size_t operator()(const Place &place) const {
-    return std::hash<Place>()(place);
-  }
-};
-}
-
-template <>
-struct hash<::paddle::platform::Place> {
-  using argument_type = ::paddle::platform::Place;
-  using result_type = size_t;
-
-  inline result_type operator()(const argument_type &place) const {
-    return boost::apply_visitor(PlaceHashVisitor(), place);
-  }
-};
-
-}  // namespace std