Follow QingQing's suggestion

paddle/framework/tensor.h

@@ -20,23 +20,19 @@ class Tensor {
   using paddle::platform::get_place;
 
  public:
-  explicit Tensor(DDim dims) : dims_(dims), place_(get_place()) {}
-  explicit Tensor(DDim dims, Place place) : dims_(dims), place_(place) {}
-
   template <typename T>
   const T* data() const {
-    PADDLE_ASSERT(holder_ != nullptr);
-    PADDLE_ASSERT(holder_->Place() == place_);
-    PADDLE_ASSERT(holder_->Size() >= dims_.product() * sizeof(T));
+    PADDLE_ASSERT(holder_ != nullptr,
+                  "Tensor::data must be called after Tensor::mutable_data");
     return static_cast<const T*>(holder->Ptr());
   }
 
   template <typename T,  // must be POD types
             typename = std::enable_if<std::is_pod<T>::value>::type>
-  T* mutable_data() {
-    if (holder_ == nullptr || holder_->Place() != place_ ||
-        holder_->Size() < dims_.product() * sizeof(T)) {
-      holder_.reset(new PlaceholderImpl(place_, dims.product() * sizeof(T)));
+  T* mutable_data(DDim dims, Place place) {
+    if (holder_ == nullptr || holder_->Place() != place ||
+        holder_->Size() < dims.product() * sizeof(T)) {
+      holder_.reset(new PlaceholderImpl(place, dims.product() * sizeof(T)));
     }
     return static_cast<T*>(holder_->Ptr());
   }
@@ -44,16 +40,7 @@ class Tensor {
   template <typename T,  // must be POD types
             typename = std::enable_if<std::is_pod<T>::value>::type>
   T* mutable_data(DDim dims) {
-    dims_ = dims;
-    return mutable_data<T>();
-  }
-
-  template <typename T,  // must be POD types
-            typename = std::enable_if<std::is_pod<T>::value>::type>
-  T* mutable_data(DDim dims, Place place) {
-    dims_ = dims;
-    place_ = place;
-    return mutable_data<T>();
+    return mutable_data<T>(dims, paddle::platform::get_place());
   }
 
  private:
@@ -69,7 +56,7 @@ class Tensor {
   template <typename T>
   struct PlaceholderImpl : public Placeholder {
     PlaceholderImpl(Place pl, size_t size)
-        : ptr_(memory::Alloc(pl, size), paddle::memory::Deleter(pl)),
+        : ptr_(paddle::memory::Alloc(pl, size), paddle::memory::Deleter(pl)),
           place_(pl),
           size_(size) {}
 
@@ -83,8 +70,6 @@ class Tensor {
   };
 
   std::unique_ptr<Placeholder> holder_;  // holds the memory block if allocated.
-  DDim dims_;  // could be smallers than the holder_->Size().
-  paddle::platform::Place place_;
 };
 
 }  // namespace framework