ENH: Remove comments

paddle/memory/detail/system_allocator.h

@@ -20,13 +20,11 @@ namespace paddle {
 namespace memory {
 namespace detail {
 
-// SystemAllocator is the parent class of CPUAllocator and
-// GPUAllocator.  A BuddyAllocator object uses a SystemAllocator*
-// pointing to the underlying system allocator.  An alternative to
-// this class hierarchy is to pass a system allocator class to
-// BuddyAllocator as a template parameter.  This approach makes
-// BuddyAllocator a class template, and it's very complicated
-// algorithm would make the buddy_allocator.h messy.
+/**
+ * \brief SystemAllocator is the parent class of CPUAllocator and GPUAllocator.
+ *        A BuddyAllocator object uses a SystemAllocator* pointing to the
+ *        underlying system allocator.
+ */
 class SystemAllocator {
  public:
   virtual ~SystemAllocator() {}

paddle/platform/gpu_info.cc

@@ -65,7 +65,6 @@ size_t GpuMinChunkSize() {
 }
 
 size_t GpuMaxChunkSize() {
-  // Allow to allocate the maximum chunk size is roughly 3% of CPU memory.
   size_t total = 0;
   size_t available = 0;