Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into refine_pod

cmake/external/boost.cmake

@@ -15,6 +15,13 @@
 include(ExternalProject)
 
 set(BOOST_PROJECT       "extern_boost")
+# To release PaddlePaddle as a pip package, we have to follow the
+# manylinux1 standard, which features as old Linux kernels and
+# compilers as possible and recommends CentOS 5. Indeed, the earliest
+# CentOS version that works with NVIDIA CUDA is CentOS 6.  And a new
+# version of boost, say, 1.66.0, doesn't build on CentOS 6.  We
+# checked that the devtools package of CentOS 6 installs boost 1.41.0.
+# So we use 1.41.0 here.
 set(BOOST_VER           "1.41.0")
 set(BOOST_TAR           "boost_1_41_0")
 set(BOOST_URL           "http://paddlepaddledeps.s3-website-us-west-1.amazonaws.com/${BOOST_TAR}.tar.gz")

doc/design/parallel_do.md

+# Design Doc: Parallel_Do in PaddlePaddle
+
+In PaddlePaddle, we use parallel_do primitive to represent multithread data parallel processing.
+
+## Design overview
+
+The definition of a parallel_do op looks like the following
+
+```c++
+AddInput(kInputs, "Inputs needed to be split onto different devices").AsDuplicable();
+AddInput(kParameters, "Parameters are duplicated over different devices")
+    .AsDuplicable();
+AddInput(kPlaces, "Devices used for parallel processing");
+AddOutput(kOutputs, "Outputs needed to be merged from different devices").AsDuplicable();
+AddOutput(kParallelScopes,
+          "Scopes for all local variables in forward pass. One scope for each device");
+AddAttr<framework::BlockDesc *>(kParallelBlock,
+                                "List of operaters to be executed in parallel");
+```
+
+A vanilla implementation of parallel_do can be shown as the following (`|` means single thread and
+`||||` means multiple threads)
+
+```
+In the forward pass
+  |      Split input onto different devices
+  |      Copy parameter to onto different devices
+  ||||   Compute forward pass in parallel
+  |      Merge output from different devices
+
+In the backward pass
+  |      Split output@grad onto different devices
+  ||||   Compute backward pass in parallel
+  |      accumulate param@grad from different devices to the first device
+  |      Merge input@grad from different devices
+  |      Copy param@grad to the place of parallel_do_op
+```
+
+This implementation allows to write mixed device program like this
+
+```python
+# get embedding feature on CPU
+feature = some_cpu_only_op(data)
+
+gpu_places = get_place(use_gpu=True)
+# parallel processing on multiple GPUs
+pd = ParallelDo(gpu_places)
+with pd.do():
+    read_input(feature)
+    prediction = my_net(feature)
+    write_output(prediction)
+prediction = pd()
+loss = cross_entropy(prediction, label)
+```
+
+And the programDesc are like the following
+
+```
+# start_program will be run by executor(CPUPlace), all w1, w2 will be allocated on CPU
+start_program
+{
+  vars: w1, w2
+  ops: init(w1), init(w2)
+}
+
+main_program
+{
+block0 {
+  vars: data, places, w1, w2
+  ops: data, get_place, parallel_do(block1),
+       parallel_do_grad(block2),
+       sgd(w2, w2_grad),
+       sgd(w1, w1_grad)
+}
+block1 {
+  parent_block: 0
+  vars: data, h1, h2, loss
+  ops: fc, fc, softmax
+}
+block2 {
+  parent_block: 1
+  vars: data_grad, h1_grad, h2_grad, loss_gard, w1_grad, w2_grad
+  ops: softmax_grad,
+       fc_grad
+       fc_grad
+}
+}
+```
+
+## Proformance Imporvement
+
+There are serial places we can make this parallel_do faster.
+
+### forward: split input onto different devices
+
+If the input of the parallel_do is independent from any prior opeartors, we can avoid this step by 
+prefetching the input onto different devices in a seperate background thread. And the python code
+looks like this.
+```python
+pd = ParallelDo(gpu_places)
+with pd.do():
+    feature = get_data_from_prefetch_queue(gpu_places)
+    prediction = my_net(feature)
+    write_output(activation)
+```
+
+### forward: Copy parameter to onto different devices
+
+We can avoid this step by making each device have a copy of the parameter. This requires:
+
+1. `fluid.default_start_up_program()` to be run on all devices
+1. In the backward, allreduce param@grad at different devices, this requires
+    1. `backward.py` add `allreduce` operators at parallel_do_grad
+    1. `allreduce` operators need to be called in async mode to achieve maximum throughput
+1. apply gradients related op(i.e. cliping, normalization, decay, sgd) on different devices in parallel
+
+By doing so, we also avoided "backward: accumulate param@grad from different devices to the first device".
+And the ProgramDesc looks like the following
+
+```
+# w1, w2 will be allocated on all GPUs
+start_program
+{
+block0 {
+  parallel_do(block1)
+}
+block1 {
+  parent_block: 0
+  vars: w1, w2
+  ops: init(w1), init(w2)
+}
+}
+
+main_program
+{
+block0 {
+  vars: data, places, w1, w2
+  ops: data, get_place, parallel_do(block1),
+       parallel_do_grad(block2),      # append_backward
+       parallel_do(block3)            # append_optimization
+       
+}
+block1 {
+  parent_block: 0
+  vars: data, h1, h2, loss
+  ops: fc, fc, softmax
+}
+block2 {
+  parent_block: 1
+  vars: data_grad, h1_grad, h2_grad, loss_gard, w1_grad, w2_grad
+  ops: softmax_grad,
+       fc_grad, allreduce(places, scopes, w1_grad),
+       fc_grad, allreduce(places, scopes, w2_grad)
+}
+block3 {
+  parent_block: 0
+  vars: lr
+  ops: sgd(w2, w2_grad),
+       sgd(w1, w1_grad)
+}
+}
+```

paddle/fluid/framework/data_device_transform.cc

@@ -37,7 +37,7 @@ void TransDataDevice(const Tensor& in, const platform::Place& dst_place,
           << " dst_place: " << dst_place;
   auto* dev_ctx = GetDeviceContext(in.place(), dst_place);
   dev_ctx->Wait();
-  Copy(in, dst_place, *dev_ctx, out);
+  TensorCopy(in, dst_place, *dev_ctx, out);
   dev_ctx->Wait();
 }
 

paddle/fluid/framework/data_device_transform_test.cu

@@ -157,8 +157,8 @@ TEST(Operator, CPUtoGPU) {
   auto dev_ctx = pool.Get(cuda_place);
 
   paddle::framework::Tensor output_tensor;
-  Copy(output2->Get<LoDTensor>(), paddle::platform::CPUPlace(), *dev_ctx,
-       &output_tensor);
+  TensorCopy(output2->Get<LoDTensor>(), paddle::platform::CPUPlace(), *dev_ctx,
+             &output_tensor);
 
   dev_ctx->Wait();
   float* output2_ptr = output_tensor.data<float>();

paddle/fluid/framework/executor.cc

@@ -73,8 +73,10 @@ static void CheckTensorNANOrInf(const std::string& name,
       tensor.type().hash_code() != typeid(double).hash_code()) {
     return;
   }
-  PADDLE_ENFORCE(!framework::HasInf(tensor), "Tensor %s has Inf", name);
-  PADDLE_ENFORCE(!framework::HasNAN(tensor), "Tensor %s has NAN", name);
+  PADDLE_ENFORCE(!framework::TensorContainsInf(tensor),
+                 "Tensor %s contains Inf", name);
+  PADDLE_ENFORCE(!framework::TensorContainsNAN(tensor),
+                 "Tensor %s contains NAN", name);
 }
 
 void Executor::Run(const ProgramDesc& pdesc, Scope* scope, int block_id,

paddle/fluid/framework/lod_tensor.cc

@@ -46,7 +46,7 @@ std::ostream &operator<<(std::ostream &os, const LoDTensor &t) {
 
   if (!platform::is_cpu_place(t.place())) {
     LoDTensor tt;
-    framework::Copy(t, platform::CPUPlace(), &tt);
+    framework::TensorCopy(t, platform::CPUPlace(), &tt);
     platform::DeviceContextPool &pool = platform::DeviceContextPool::Instance();
     auto &dev_ctx = *pool.Get(t.place());
     dev_ctx.Wait();
@@ -255,7 +255,7 @@ void SerializeToStream(std::ostream &os, const LoDTensor &tensor,
     }
   }
   // the 3st field, Tensor
-  SerializeToStream(os, static_cast<Tensor>(tensor), dev_ctx);
+  TensorToStream(os, static_cast<Tensor>(tensor), dev_ctx);
 }
 
 void DeserializeFromStream(std::istream &is, LoDTensor *tensor,
@@ -282,7 +282,7 @@ void DeserializeFromStream(std::istream &is, LoDTensor *tensor,
     }
   }
   // the 3st filed, Tensor
-  DeserializeFromStream(is, static_cast<Tensor *>(tensor), dev_ctx);
+  TensorFromStream(is, static_cast<Tensor *>(tensor), dev_ctx);
 }
 
 std::vector<LoDTensor> LoDTensor::SplitLoDTensor(
@@ -308,14 +308,14 @@ std::vector<LoDTensor> LoDTensor::SplitLoDTensor(
     if (lod().empty()) {
       auto src = Slice(begin, end);
       auto &dst_place = places[i];
-      framework::Copy(src, dst_place, &dst);
+      framework::TensorCopy(src, dst_place, &dst);
     } else {
       auto lod_and_offset = GetSubLoDAndAbsoluteOffset(lod(), begin, end, 0);
 
       auto &offset = lod_and_offset.second;
       auto src = Slice(offset.first, offset.second);
       auto &dst_place = places[i];
-      framework::Copy(src, dst_place, &dst);
+      framework::TensorCopy(src, dst_place, &dst);
 
       LoD my_lod;
       for (auto &l : lod_and_offset.first) {
@@ -369,7 +369,7 @@ void LoDTensor::MergeLoDTensor(
   for (auto *src : lod_tensors) {
     int end = begin + src->dims()[0];
     auto dst = Slice(begin, end);
-    framework::Copy(*src, dst_place, &dst);
+    framework::TensorCopy(*src, dst_place, &dst);
     begin = end;
   }
 }

paddle/fluid/framework/lod_tensor.h

@@ -175,8 +175,8 @@ LoDTensor LodExpand(const LoDTensor& source, const LoD& lod, size_t level,
   for (size_t ins = 0; ins < num_instances; ins++) {
     for (size_t elem = lod_level[ins]; elem < lod_level[ins + 1]; elem++) {
       auto slice = tensor.Slice(elem, elem + 1);
-      Copy(source.Slice(ins, ins + 1), platform::CPUPlace(),
-           platform::CPUDeviceContext(), &slice);
+      TensorCopy(source.Slice(ins, ins + 1), platform::CPUPlace(),
+                 platform::CPUDeviceContext(), &slice);
     }
   }
   return tensor;

paddle/fluid/framework/mixed_vector.h

@@ -291,7 +291,7 @@ class Vector {
 
   void CopyToCPU() const {
     // COPY GPU Data To CPU
-    Copy(cuda_vec_, platform::CPUPlace(), &cpu_vec_);
+    TensorCopy(cuda_vec_, platform::CPUPlace(), &cpu_vec_);
     WaitPlace(cuda_vec_.place());
   }
 
@@ -305,13 +305,14 @@ class Vector {
   void ImmutableCUDA(platform::Place place) const {
     if (IsDirty()) {
       if (IsInCPU()) {
-        Copy(cpu_vec_, boost::get<platform::CUDAPlace>(place), &cuda_vec_);
+        TensorCopy(cpu_vec_, boost::get<platform::CUDAPlace>(place),
+                   &cuda_vec_);
         WaitPlace(place);
         UnsetFlag(kDirty);
         SetFlag(kDataInCUDA);
       } else if (IsInCUDA() && !(place == cuda_vec_.place())) {
         framework::Tensor tmp;
-        Copy(cuda_vec_, boost::get<platform::CUDAPlace>(place), &tmp);
+        TensorCopy(cuda_vec_, boost::get<platform::CUDAPlace>(place), &tmp);
         WaitPlace(cuda_vec_.place());
         cuda_vec_.ShareDataWith(tmp);
         // Still dirty
@@ -322,13 +323,14 @@ class Vector {
     } else {
       if (!IsInCUDA()) {
         // Even data is not dirty. However, data is not in CUDA. Copy data.
-        Copy(cpu_vec_, boost::get<platform::CUDAPlace>(place), &cuda_vec_);
+        TensorCopy(cpu_vec_, boost::get<platform::CUDAPlace>(place),
+                   &cuda_vec_);
         WaitPlace(place);
         SetFlag(kDataInCUDA);
       } else if (!(place == cuda_vec_.place())) {
         framework::Tensor tmp;
         WaitPlace(cuda_vec_.place());
-        Copy(cuda_vec_, boost::get<platform::CUDAPlace>(place), &tmp);
+        TensorCopy(cuda_vec_, boost::get<platform::CUDAPlace>(place), &tmp);
         WaitPlace(cuda_vec_.place());
         WaitPlace(place);
         cuda_vec_.ShareDataWith(tmp);

paddle/fluid/framework/reader.cc

@@ -105,7 +105,7 @@ void BatchReader::ReadNext(std::vector<LoDTensor>* out) {
         }
       }
       Tensor dst = out_tensor.Slice(dst_offset, dst_offset + ins_shape[0]);
-      Copy(buffer_[i][j], platform::CPUPlace(), &dst);
+      TensorCopy(buffer_[i][j], platform::CPUPlace(), &dst);
       dst_offset += ins_shape[0];
     }
     out_tensor.set_lod(batch_lod);

paddle/fluid/framework/selected_rows.cc

@@ -34,7 +34,7 @@ void SerializeToStream(std::ostream& os, const SelectedRows& selected_rows,
     os.write(reinterpret_cast<const char*>(&height), sizeof(height));
   }
   // the 4st field, Tensor data
-  SerializeToStream(os, selected_rows.value(), dev_ctx);
+  TensorToStream(os, selected_rows.value(), dev_ctx);
 }
 
 void DeserializeFromStream(std::istream& is, SelectedRows* selected_rows,
@@ -62,7 +62,7 @@ void DeserializeFromStream(std::istream& is, SelectedRows* selected_rows,
     selected_rows->set_height(height);
   }
   // the 4st field, tensor which contains the data
-  DeserializeFromStream(is, selected_rows->mutable_value(), dev_ctx);
+  TensorFromStream(is, selected_rows->mutable_value(), dev_ctx);
 }
 
 }  // namespace framework

paddle/fluid/framework/tensor_util.cc

@@ -16,6 +16,76 @@
 
 namespace paddle {
 namespace framework {
+
+void TensorCopy(const Tensor& src, const platform::Place& dst_place,
+                const platform::DeviceContext& ctx, Tensor* dst) {
+  VLOG(3) << "TensorCopy " << src.dims() << " from " << src.place() << " to "
+          << dst_place;
+  src.check_memory_size();
+
+  dst->Resize(src.dims());
+  dst->set_layout(src.layout());
+  auto src_place = src.place();
+  auto src_ptr = src.data<void>();
+
+  auto dst_ptr = dst->mutable_data(dst_place, src.type());
+
+  auto size = src.numel() * SizeOfType(src.type());
+
+  if (platform::is_cpu_place(src_place) && platform::is_cpu_place(dst_place)) {
+    memory::Copy(boost::get<platform::CPUPlace>(dst_place), dst_ptr,
+                 boost::get<platform::CPUPlace>(src_place), src_ptr, size);
+  }
+#ifdef PADDLE_WITH_CUDA
+  else if (platform::is_gpu_place(src_place) &&  // NOLINT
+           platform::is_cpu_place(dst_place)) {
+    auto src_gpu_place = boost::get<platform::CUDAPlace>(src_place);
+    auto dst_cpu_place = boost::get<platform::CPUPlace>(dst_place);
+    auto ctx_place = ctx.GetPlace();
+    PADDLE_ENFORCE(platform::is_gpu_place(ctx_place));
+    auto ctx_gpu_place = boost::get<platform::CUDAPlace>(ctx_place);
+    PADDLE_ENFORCE_EQ(src_gpu_place, ctx_gpu_place);
+    memory::Copy(
+        dst_cpu_place, dst_ptr, src_gpu_place, src_ptr, size,
+        reinterpret_cast<const platform::CUDADeviceContext&>(ctx).stream());
+  } else if (platform::is_cpu_place(src_place) &&
+             platform::is_gpu_place(dst_place)) {
+    auto src_cpu_place = boost::get<platform::CPUPlace>(src_place);
+    auto dst_gpu_place = boost::get<platform::CUDAPlace>(dst_place);
+    auto ctx_place = ctx.GetPlace();
+    PADDLE_ENFORCE(platform::is_gpu_place(ctx_place));
+    auto ctx_gpu_place = boost::get<platform::CUDAPlace>(ctx_place);
+    PADDLE_ENFORCE_EQ(dst_gpu_place, ctx_gpu_place);
+    memory::Copy(
+        dst_gpu_place, dst_ptr, src_cpu_place, src_ptr, size,
+        reinterpret_cast<const platform::CUDADeviceContext&>(ctx).stream());
+  } else if (platform::is_gpu_place(src_place) &&
+             platform::is_gpu_place(dst_place)) {
+    auto src_gpu_place = boost::get<platform::CUDAPlace>(src_place);
+    auto dst_gpu_place = boost::get<platform::CUDAPlace>(dst_place);
+    auto ctx_place = ctx.GetPlace();
+    PADDLE_ENFORCE(platform::is_gpu_place(ctx_place));
+    auto ctx_gpu_place = boost::get<platform::CUDAPlace>(ctx_place);
+    PADDLE_ENFORCE_EQ(src_gpu_place, ctx_gpu_place);
+    memory::Copy(
+        dst_gpu_place, dst_ptr, src_gpu_place, src_ptr, size,
+        reinterpret_cast<const platform::CUDADeviceContext&>(ctx).stream());
+  }
+#endif
+}
+
+void TensorCopy(const Tensor& src, const platform::Place& dst_place,
+                Tensor* dst) {
+  platform::DeviceContextPool& pool = platform::DeviceContextPool::Instance();
+  const platform::DeviceContext* dev_ctx;
+  if (platform::is_gpu_place(src.place())) {
+    dev_ctx = pool.Get(src.place());
+  } else {
+    dev_ctx = pool.Get(dst_place);
+  }
+  TensorCopy(src, dst_place, *dev_ctx, dst);
+}
+
 template <typename Predicate, typename DevCtx>
 struct AnyDTypeVisitor {
   Predicate predicate_;
@@ -69,7 +139,7 @@ struct AnyVisitor : public boost::static_visitor<bool> {
     tmp.mutable_data<bool>(cpu);
     auto gpuctx = platform::DeviceContextPool::Instance().Get(gpu);
     gpuctx->Wait();
-    Copy(out, cpu, *gpuctx, &tmp);
+    TensorCopy(out, cpu, *gpuctx, &tmp);
     gpuctx->Wait();
     return GetResult(tmp, cpu);
   }
@@ -87,7 +157,7 @@ inline bool Any(const framework::Tensor& tensor, Predicate predicate) {
   return platform::VisitPlace(place, visitor);
 }
 
-struct HasNANPredicate {
+struct ContainsNANPredicate {
   template <typename T>
   auto operator()(const T& eigen_vec) const
       -> decltype(std::declval<T>().isnan()) {
@@ -96,12 +166,12 @@ struct HasNANPredicate {
   }
 };
 
-bool HasNAN(const framework::Tensor& tensor) {
-  HasNANPredicate predicate;
+bool TensorContainsNAN(const framework::Tensor& tensor) {
+  ContainsNANPredicate predicate;
   return Any(tensor, predicate);
 }
 
-struct HasInfPredicate {
+struct ContainsInfPredicate {
   template <typename T>
   auto operator()(const T& eigen_vec) const
       -> decltype(std::declval<T>().isinf()) {
@@ -110,10 +180,124 @@ struct HasInfPredicate {
   }
 };
 
-bool HasInf(const framework::Tensor& tensor) {
-  HasInfPredicate predicate;
+bool TensorContainsInf(const framework::Tensor& tensor) {
+  ContainsInfPredicate predicate;
   return Any(tensor, predicate);
 }
 
+void TensorToStream(std::ostream& os, const Tensor& tensor,
+                    const platform::DeviceContext& dev_ctx) {
+  // TODO(typhoonzero): serialize to ostream
+  {  // the 1st field, uint32_t version
+    constexpr uint32_t version = 0;
+    os.write(reinterpret_cast<const char*>(&version), sizeof(version));
+  }
+  {  // the 2nd field, tensor description
+     // int32_t  size
+     // void*    protobuf message
+    proto::VarType::TensorDesc desc;
+    desc.set_data_type(framework::ToDataType(tensor.type()));
+    auto dims = framework::vectorize(tensor.dims());
+    auto* pb_dims = desc.mutable_dims();
+    pb_dims->Resize(static_cast<int>(dims.size()), 0);
+    std::copy(dims.begin(), dims.end(), pb_dims->begin());
+    int32_t size = desc.ByteSize();
+    os.write(reinterpret_cast<const char*>(&size), sizeof(size));
+    auto out = desc.SerializeAsString();
+    os.write(out.data(), size);
+  }
+  {  // the 3rd field, tensor data
+    uint64_t size = tensor.memory_size();
+    auto* data_ptr = tensor.data<void>();
+    PADDLE_ENFORCE(size < std::numeric_limits<std::streamsize>::max(),
+                   "Index overflow when writing tensor");
+    if (platform::is_gpu_place(tensor.place())) {
+#ifdef PADDLE_WITH_CUDA
+      constexpr size_t kBufSize = 1024 * 1024 * 64;  // 64MB
+      std::unique_ptr<char[]> buf(new char[kBufSize]);
+      auto& gpu_dev_ctx =
+          static_cast<const platform::CUDADeviceContext&>(dev_ctx);
+      platform::CPUPlace cpu;
+      uintptr_t data = reinterpret_cast<uintptr_t>(data_ptr);
+      while (size != 0) {
+        size_t size_to_write = std::min(kBufSize, static_cast<size_t>(size));
+        memory::Copy(cpu, buf.get(),
+                     boost::get<platform::CUDAPlace>(tensor.place()),
+                     reinterpret_cast<const void*>(data), size_to_write,
+                     gpu_dev_ctx.stream());
+        gpu_dev_ctx.Wait();
+        os.write(buf.get(), size_to_write);
+        data += size_to_write;
+        size -= size_to_write;
+      }
+#else
+      PADDLE_THROW("Unexpected branch");
+#endif
+    } else {
+      os.write(static_cast<const char*>(data_ptr),
+               static_cast<std::streamsize>(size));
+    }
+  }
+}
+
+struct DeserializedDataFunctor {
+  DeserializedDataFunctor(void** buf, Tensor* tensor,
+                          const platform::Place& place)
+      : buf_(buf), tensor_(tensor), place_(place) {}
+
+  template <typename T>
+  void operator()() {
+    *buf_ = tensor_->mutable_data<T>(place_);
+  }
+
+  void** buf_;
+  Tensor* tensor_;
+  platform::Place place_;
+};
+
+void TensorFromStream(std::istream& is, Tensor* tensor,
+                      const platform::DeviceContext& dev_ctx) {
+  uint32_t version;
+  is.read(reinterpret_cast<char*>(&version), sizeof(version));
+  PADDLE_ENFORCE_EQ(version, 0U, "Only version 0 is supported");
+  proto::VarType::TensorDesc desc;
+  {  // int32_t size
+     // proto buffer
+    int32_t size;
+    is.read(reinterpret_cast<char*>(&size), sizeof(size));
+    std::unique_ptr<char[]> buf(new char[size]);
+    is.read(reinterpret_cast<char*>(buf.get()), size);
+    PADDLE_ENFORCE(desc.ParseFromArray(buf.get(), size),
+                   "Cannot parse tensor desc");
+  }
+  {  // read tensor
+    std::vector<int64_t> dims;
+    dims.reserve(static_cast<size_t>(desc.dims().size()));
+    std::copy(desc.dims().begin(), desc.dims().end(), std::back_inserter(dims));
+    tensor->Resize(framework::make_ddim(dims));
+    void* buf;
+    auto ctx = platform::CPUDeviceContext();
+    if (platform::is_gpu_place(dev_ctx.GetPlace())) {
+#ifdef PADDLE_WITH_CUDA
+      Tensor cpu_tensor;
+      cpu_tensor.Resize(framework::make_ddim(dims));
+      framework::VisitDataType(
+          desc.data_type(),
+          DeserializedDataFunctor(&buf, &cpu_tensor, ctx.GetPlace()));
+      is.read(static_cast<char*>(buf), cpu_tensor.memory_size());
+      auto dst_place = dev_ctx.GetPlace();
+      framework::TensorCopy(cpu_tensor, dst_place, dev_ctx, tensor);
+#else
+      PADDLE_THROW("Unexpected branch");
+#endif
+    } else {
+      framework::VisitDataType(
+          desc.data_type(),
+          DeserializedDataFunctor(&buf, tensor, ctx.GetPlace()));
+      is.read(static_cast<char*>(buf), tensor->memory_size());
+    }
+  }
+}
+
 }  // namespace framework
 }  // namespace paddle

paddle/fluid/framework/tensor_util.cu

-/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-   http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License. */
-
-#include "paddle/fluid/framework/tensor_util.h"
-
-namespace paddle {
-namespace framework {
-template <typename Predicate, typename DevCtx>
-struct AnyDTypeVisitor {
-  Predicate predicate_;
-  const Tensor& tensor_;
-  const DevCtx& ctx_;
-  Tensor* out_;
-
-  AnyDTypeVisitor(Predicate predicate, const Tensor& tensor, const DevCtx& ctx,
-                  Tensor* out)
-      : predicate_(predicate), tensor_(tensor), ctx_(ctx), out_(out) {}
-
-  template <typename T>
-  void operator()() const {
-    auto t = EigenVector<T>::Flatten(tensor_);
-    auto o = EigenScalar<bool>::From(*out_);
-    // return any of predicate_(t) is true.
-    o.device(*ctx_.eigen_device()) = predicate_(t).any();
-  }
-};
-
-template <typename Predicate, typename DevCtx>
-inline void AnyImpl(Predicate predicate, const framework::Tensor& tensor,
-                    const DevCtx& ctx, framework::Tensor* out) {
-  VisitDataType(ToDataType(tensor.type()), AnyDTypeVisitor<Predicate, DevCtx>(
-                                               predicate, tensor, ctx, out));
-}
-
-template <typename Predicate>
-struct AnyVisitor : public boost::static_visitor<bool> {
-  const framework::Tensor& tensor_;
-  Predicate predicate_;
-
-  AnyVisitor(const framework::Tensor& tensor, Predicate predicate)
-      : tensor_(tensor), predicate_(std::move(predicate)) {}
-
-  template <typename Place>
-  bool operator()(const Place& place) const {
-    framework::Tensor out;
-    out.Resize({1});
-    out.mutable_data<bool>(place);
-    auto* ctx = platform::DeviceContextPool::Instance().GetByPlace(place);
-    AnyImpl(predicate_, tensor_, *ctx, &out);
-    return this->GetResult(out, place);
-  }
-
-  bool GetResult(const framework::Tensor& out,
-                 const platform::CUDAPlace& gpu) const {
-    platform::CPUPlace cpu;
-    framework::Tensor tmp;
-    tmp.Resize({1});
-    tmp.mutable_data<bool>(cpu);
-    auto gpuctx = platform::DeviceContextPool::Instance().Get(gpu);
-    gpuctx->Wait();
-    Copy(out, cpu, *gpuctx, &tmp);
-    gpuctx->Wait();
-    return GetResult(tmp, cpu);
-  }
-
-  bool GetResult(const framework::Tensor& out,
-                 const platform::CPUPlace& cpu) const {
-    return *out.data<bool>();
-  }
-};
-
-template <typename Predicate>
-inline bool Any(const framework::Tensor& tensor, Predicate predicate) {
-  AnyVisitor<Predicate> visitor(tensor, predicate);
-  auto place = tensor.place();
-  return platform::VisitPlace(place, visitor);
-}
-
-struct HasNANPredicate {
-  template <typename T>
-  auto operator()(const T& eigen_vec) const
-      -> decltype(std::declval<T>().isnan()) {
-    // Cast eigen_vector to vector of bool. true if is inf.
-    return eigen_vec.isnan();
-  }
-};
-
-bool HasNAN(const framework::Tensor& tensor) {
-  HasNANPredicate predicate;
-  return Any(tensor, predicate);
-}
-
-struct HasInfPredicate {
-  template <typename T>
-  auto operator()(const T& eigen_vec) const
-      -> decltype(std::declval<T>().isinf()) {
-    // Cast eigen_vector to vector of bool. true if is inf.
-    return eigen_vec.isinf();
-  }
-};
-
-bool HasInf(const framework::Tensor& tensor) {
-  HasInfPredicate predicate;
-  return Any(tensor, predicate);
-}
-
-}  // namespace framework
-}  // namespace paddle

paddle/fluid/framework/tensor_util.cu

+tensor_util.cc
\ No newline at end of file

paddle/fluid/framework/tensor_util.h

@@ -22,106 +22,38 @@ limitations under the License. */
 namespace paddle {
 namespace framework {
 
-/**
- * @brief   Copy the content of external tensor to a new place.
- *
- * @param[in] src        The external tensor.
- * @param[in] dst_place  The dst place.
- * @param[in] ctx        The device context contains device resources.
- *
- * @note    Copy supports CPU <-> GPU, GPU <-> GPU.
- */
-inline void Copy(const Tensor& src, const platform::Place& dst_place,
-                 const platform::DeviceContext& ctx, Tensor* dst) {
-  VLOG(3) << "Copy " << src.dims() << " from " << src.place() << " to "
-          << dst_place;
-  src.check_memory_size();
+void TensorCopy(const Tensor& src, const platform::Place& dst_place,
+                const platform::DeviceContext& ctx, Tensor* dst);
+void TensorCopy(const Tensor& src, const platform::Place& dst_place,
+                Tensor* dst);
 
-  dst->Resize(src.dims());
-  dst->set_layout(src.layout());
-  auto src_place = src.place();
-  auto src_ptr = src.data<void>();
+template <typename T>
+void TensorFromVector(const std::vector<T>& src,
+                      const platform::DeviceContext& ctx, Tensor* dst);
+template <typename T>
+void TensorFromVector(const std::vector<T>& src, Tensor* dst);
 
-  auto dst_ptr = dst->mutable_data(dst_place, src.type());
+template <typename T>
+void TensorToVector(const Tensor& src, const platform::DeviceContext& ctx,
+                    std::vector<T>* dst);
+template <typename T>
+void TesnorToVector(const Tensor& src, std::vector<T>* dst);
 
-  auto size = src.numel() * SizeOfType(src.type());
+bool TensorContainsNAN(const framework::Tensor& tensor);
+bool TensorContainsInf(const framework::Tensor& tensor);
 
-  if (platform::is_cpu_place(src_place) && platform::is_cpu_place(dst_place)) {
-    memory::Copy(boost::get<platform::CPUPlace>(dst_place), dst_ptr,
-                 boost::get<platform::CPUPlace>(src_place), src_ptr, size);
-  }
-#ifdef PADDLE_WITH_CUDA
-  else if (platform::is_gpu_place(src_place) &&  // NOLINT
-           platform::is_cpu_place(dst_place)) {
-    auto src_gpu_place = boost::get<platform::CUDAPlace>(src_place);
-    auto dst_cpu_place = boost::get<platform::CPUPlace>(dst_place);
-    auto ctx_place = ctx.GetPlace();
-    PADDLE_ENFORCE(platform::is_gpu_place(ctx_place));
-    auto ctx_gpu_place = boost::get<platform::CUDAPlace>(ctx_place);
-    PADDLE_ENFORCE_EQ(src_gpu_place, ctx_gpu_place);
-    memory::Copy(
-        dst_cpu_place, dst_ptr, src_gpu_place, src_ptr, size,
-        reinterpret_cast<const platform::CUDADeviceContext&>(ctx).stream());
-  } else if (platform::is_cpu_place(src_place) &&
-             platform::is_gpu_place(dst_place)) {
-    auto src_cpu_place = boost::get<platform::CPUPlace>(src_place);
-    auto dst_gpu_place = boost::get<platform::CUDAPlace>(dst_place);
-    auto ctx_place = ctx.GetPlace();
-    PADDLE_ENFORCE(platform::is_gpu_place(ctx_place));
-    auto ctx_gpu_place = boost::get<platform::CUDAPlace>(ctx_place);
-    PADDLE_ENFORCE_EQ(dst_gpu_place, ctx_gpu_place);
-    memory::Copy(
-        dst_gpu_place, dst_ptr, src_cpu_place, src_ptr, size,
-        reinterpret_cast<const platform::CUDADeviceContext&>(ctx).stream());
-  } else if (platform::is_gpu_place(src_place) &&
-             platform::is_gpu_place(dst_place)) {
-    auto src_gpu_place = boost::get<platform::CUDAPlace>(src_place);
-    auto dst_gpu_place = boost::get<platform::CUDAPlace>(dst_place);
-    auto ctx_place = ctx.GetPlace();
-    PADDLE_ENFORCE(platform::is_gpu_place(ctx_place));
-    auto ctx_gpu_place = boost::get<platform::CUDAPlace>(ctx_place);
-    PADDLE_ENFORCE_EQ(src_gpu_place, ctx_gpu_place);
-    memory::Copy(
-        dst_gpu_place, dst_ptr, src_gpu_place, src_ptr, size,
-        reinterpret_cast<const platform::CUDADeviceContext&>(ctx).stream());
-  }
-#endif
-}
+void TensorToStream(std::ostream& os, const Tensor& tensor,
+                    const platform::DeviceContext& dev_ctx);
+void TensorFromStream(std::istream& is, Tensor* tensor,
+                      const platform::DeviceContext& dev_ctx);
 
-/**
- * @brief Wrapper on
- *     Copy(const Tensor& src, const platform::Place& dst_place,
- *              const platform::DeviceContext& ctx, Tensor* dst);
- *
- * @param[in] src        The external tensor.
- * @param[in] dst_place  The dst place.
- *
- * @note    Copy supports CPU <-> GPU, GPU <-> GPU.
- */
-inline void Copy(const Tensor& src, const platform::Place& dst_place,
-                 Tensor* dst) {
-  platform::DeviceContextPool& pool = platform::DeviceContextPool::Instance();
-  const platform::DeviceContext* dev_ctx;
-  if (platform::is_gpu_place(src.place())) {
-    dev_ctx = pool.Get(src.place());
-  } else {
-    dev_ctx = pool.Get(dst_place);
-  }
-  Copy(src, dst_place, *dev_ctx, dst);
-}
+//
+// The implementation of template functions.
+//
 
-/**
- * @brief   Copy the content of an external vector to a tensor.
- *
- * @param[in] src        The external tensor.
- * @param[in] ctx        The device context contains device resources.
- *
- * * @note    CopyFromVector will resize dst to an 1D tensor with the same
- *            size as src.
- */
 template <typename T>
-inline void CopyFromVector(const std::vector<T>& src,
-                           const platform::DeviceContext& ctx, Tensor* dst) {
+void TensorFromVector(const std::vector<T>& src,
+                      const platform::DeviceContext& ctx, Tensor* dst) {
   auto dst_place = ctx.GetPlace();
   auto src_ptr = static_cast<const void*>(src.data());
   platform::CPUPlace src_place;
@@ -143,11 +75,8 @@ inline void CopyFromVector(const std::vector<T>& src,
 #endif
 }
 
-/**
- * @brief CopyFromVector CPU vector -> CPU Tensor
- */
 template <typename T>
-inline void CopyFromVector(const std::vector<T>& src, Tensor* dst) {
+void TensorFromVector(const std::vector<T>& src, Tensor* dst) {
   platform::CPUPlace dst_place = platform::CPUPlace();
   auto src_ptr = static_cast<const void*>(src.data());
   platform::CPUPlace src_place;
@@ -158,18 +87,9 @@ inline void CopyFromVector(const std::vector<T>& src, Tensor* dst) {
   memory::Copy(dst_place, dst_ptr, src_place, src_ptr, size);
 }
 
-/**
- * @brief   Copy the content of a tensor to a vector
- *
- * @param[in] src        The external tensor.
- * @param[in] ctx        The device context contains device resources.
- *
- * * @note    CopyFromVector assumes that the tensor has been resized
- *            before invoking.
- */
 template <typename T>
-inline void CopyToVector(const Tensor& src, const platform::DeviceContext& ctx,
-                         std::vector<T>* dst) {
+void TensorToVector(const Tensor& src, const platform::DeviceContext& ctx,
+                    std::vector<T>* dst) {
   auto src_ptr = static_cast<const void*>(src.data<T>());
   auto size = src.numel() * sizeof(T);
 
@@ -191,11 +111,8 @@ inline void CopyToVector(const Tensor& src, const platform::DeviceContext& ctx,
 #endif
 }
 
-/**
- * @brief CopyToVector CPUTensor <-> CPU Vector
- */
 template <typename T>
-inline void CopyToVector(const Tensor& src, std::vector<T>* dst) {
+void TensorToVector(const Tensor& src, std::vector<T>* dst) {
   auto src_ptr = static_cast<const void*>(src.data<T>());
   auto size = src.numel() * sizeof(T);
 
@@ -209,125 +126,5 @@ inline void CopyToVector(const Tensor& src, std::vector<T>* dst) {
                src_ptr, size);
 }
 
-// Returns true if a tensor contains NAN, i.e., Not A Number.
-bool HasNAN(const framework::Tensor& tensor);
-
-// Returns true if a tensor contains Inf, i.e., Infinity.
-bool HasInf(const framework::Tensor& tensor);
-
-inline void SerializeToStream(std::ostream& os, const Tensor& tensor,
-                              const platform::DeviceContext& dev_ctx) {
-  // TODO(typhoonzero): serialize to ostream
-  {  // the 1st field, uint32_t version
-    constexpr uint32_t version = 0;
-    os.write(reinterpret_cast<const char*>(&version), sizeof(version));
-  }
-  {  // the 2nd field, tensor description
-     // int32_t  size
-     // void*    protobuf message
-    proto::VarType::TensorDesc desc;
-    desc.set_data_type(framework::ToDataType(tensor.type()));
-    auto dims = framework::vectorize(tensor.dims());
-    auto* pb_dims = desc.mutable_dims();
-    pb_dims->Resize(static_cast<int>(dims.size()), 0);
-    std::copy(dims.begin(), dims.end(), pb_dims->begin());
-    int32_t size = desc.ByteSize();
-    os.write(reinterpret_cast<const char*>(&size), sizeof(size));
-    auto out = desc.SerializeAsString();
-    os.write(out.data(), size);
-  }
-  {  // the 3rd field, tensor data
-    uint64_t size = tensor.memory_size();
-    auto* data_ptr = tensor.data<void>();
-    PADDLE_ENFORCE(size < std::numeric_limits<std::streamsize>::max(),
-                   "Index overflow when writing tensor");
-    if (platform::is_gpu_place(tensor.place())) {
-#ifdef PADDLE_WITH_CUDA
-      constexpr size_t kBufSize = 1024 * 1024 * 64;  // 64MB
-      std::unique_ptr<char[]> buf(new char[kBufSize]);
-      auto& gpu_dev_ctx =
-          static_cast<const platform::CUDADeviceContext&>(dev_ctx);
-      platform::CPUPlace cpu;
-      uintptr_t data = reinterpret_cast<uintptr_t>(data_ptr);
-      while (size != 0) {
-        size_t size_to_write = std::min(kBufSize, static_cast<size_t>(size));
-        memory::Copy(cpu, buf.get(),
-                     boost::get<platform::CUDAPlace>(tensor.place()),
-                     reinterpret_cast<const void*>(data), size_to_write,
-                     gpu_dev_ctx.stream());
-        gpu_dev_ctx.Wait();
-        os.write(buf.get(), size_to_write);
-        data += size_to_write;
-        size -= size_to_write;
-      }
-#else
-      PADDLE_THROW("Unexpected branch");
-#endif
-    } else {
-      os.write(static_cast<const char*>(data_ptr),
-               static_cast<std::streamsize>(size));
-    }
-  }
-}
-
-struct DeserializedDataFunctor {
-  DeserializedDataFunctor(void** buf, Tensor* tensor,
-                          const platform::Place& place)
-      : buf_(buf), tensor_(tensor), place_(place) {}
-
-  template <typename T>
-  void operator()() {
-    *buf_ = tensor_->mutable_data<T>(place_);
-  }
-
-  void** buf_;
-  Tensor* tensor_;
-  platform::Place place_;
-};
-
-inline void DeserializeFromStream(std::istream& is, Tensor* tensor,
-                                  const platform::DeviceContext& dev_ctx) {
-  uint32_t version;
-  is.read(reinterpret_cast<char*>(&version), sizeof(version));
-  PADDLE_ENFORCE_EQ(version, 0U, "Only version 0 is supported");
-  proto::VarType::TensorDesc desc;
-  {  // int32_t size
-     // proto buffer
-    int32_t size;
-    is.read(reinterpret_cast<char*>(&size), sizeof(size));
-    std::unique_ptr<char[]> buf(new char[size]);
-    is.read(reinterpret_cast<char*>(buf.get()), size);
-    PADDLE_ENFORCE(desc.ParseFromArray(buf.get(), size),
-                   "Cannot parse tensor desc");
-  }
-  {  // read tensor
-    std::vector<int64_t> dims;
-    dims.reserve(static_cast<size_t>(desc.dims().size()));
-    std::copy(desc.dims().begin(), desc.dims().end(), std::back_inserter(dims));
-    tensor->Resize(framework::make_ddim(dims));
-    void* buf;
-    auto ctx = platform::CPUDeviceContext();
-    if (platform::is_gpu_place(dev_ctx.GetPlace())) {
-#ifdef PADDLE_WITH_CUDA
-      Tensor cpu_tensor;
-      cpu_tensor.Resize(framework::make_ddim(dims));
-      framework::VisitDataType(
-          desc.data_type(),
-          DeserializedDataFunctor(&buf, &cpu_tensor, ctx.GetPlace()));
-      is.read(static_cast<char*>(buf), cpu_tensor.memory_size());
-      auto dst_place = dev_ctx.GetPlace();
-      framework::Copy(cpu_tensor, dst_place, dev_ctx, tensor);
-#else
-      PADDLE_THROW("Unexpected branch");
-#endif
-    } else {
-      framework::VisitDataType(
-          desc.data_type(),
-          DeserializedDataFunctor(&buf, tensor, ctx.GetPlace()));
-      is.read(static_cast<char*>(buf), tensor->memory_size());
-    }
-  }
-}
-
 }  // namespace framework
 }  // namespace paddle

paddle/fluid/framework/tensor_util_test.cc

@@ -20,7 +20,7 @@
 namespace paddle {
 namespace framework {
 
-TEST(Copy, Tensor) {
+TEST(TensorCopy, Tensor) {
   Tensor src_tensor;
   Tensor dst_tensor;
   platform::CPUDeviceContext cpu_ctx((platform::CPUPlace()));
@@ -33,7 +33,7 @@ TEST(Copy, Tensor) {
   src_tensor.set_layout(DataLayout::kAnyLayout);
 
   auto cpu_place = new platform::CPUPlace();
-  Copy(src_tensor, *cpu_place, &dst_tensor);
+  TensorCopy(src_tensor, *cpu_place, &dst_tensor);
 
   const int* dst_ptr = dst_tensor.data<int>();
   ASSERT_NE(src_ptr, dst_ptr);
@@ -44,7 +44,7 @@ TEST(Copy, Tensor) {
   EXPECT_TRUE(dst_tensor.layout() == src_tensor.layout());
 
   Tensor slice_tensor = src_tensor.Slice(1, 2);
-  Copy(slice_tensor, *cpu_place, &dst_tensor);
+  TensorCopy(slice_tensor, *cpu_place, &dst_tensor);
   const int* slice_ptr = slice_tensor.data<int>();
   dst_ptr = dst_tensor.data<int>();
   ASSERT_NE(dst_ptr, slice_ptr);
@@ -68,11 +68,11 @@ TEST(Copy, Tensor) {
     // CPU Tensor to GPU Tensor
     auto gpu_place = new platform::CUDAPlace(0);
     platform::CUDADeviceContext gpu_ctx(*gpu_place);
-    Copy(src_tensor, *gpu_place, gpu_ctx, &gpu_tensor);
+    TensorCopy(src_tensor, *gpu_place, gpu_ctx, &gpu_tensor);
 
     // GPU Tensor to CPU Tensor
     auto cpu_place = new platform::CPUPlace();
-    Copy(gpu_tensor, *cpu_place, gpu_ctx, &dst_tensor);
+    TensorCopy(gpu_tensor, *cpu_place, gpu_ctx, &dst_tensor);
 
     // Sync before Compare Tensors
     gpu_ctx.Wait();
@@ -85,10 +85,10 @@ TEST(Copy, Tensor) {
     Tensor slice_tensor = src_tensor.Slice(1, 2);
 
     // CPU Slice Tensor to GPU Tensor
-    Copy(slice_tensor, *gpu_place, gpu_ctx, &gpu_tensor);
+    TensorCopy(slice_tensor, *gpu_place, gpu_ctx, &gpu_tensor);
 
     // GPU Tensor to CPU Tensor
-    Copy(gpu_tensor, *cpu_place, gpu_ctx, &dst_tensor);
+    TensorCopy(gpu_tensor, *cpu_place, gpu_ctx, &dst_tensor);
 
     // Sync before Compare Slice Tensors
     gpu_ctx.Wait();
@@ -104,7 +104,7 @@ TEST(Copy, Tensor) {
 #endif
 }
 
-TEST(CopyFromVector, Tensor) {
+TEST(TensorFromVector, Tensor) {
   using namespace paddle::framework;
   using namespace paddle::platform;
   {
@@ -114,7 +114,7 @@ TEST(CopyFromVector, Tensor) {
     // Copy to CPU Tensor
     cpu_tensor.Resize(make_ddim({3, 3}));
     auto cpu_place = new paddle::platform::CPUPlace();
-    CopyFromVector<int>(src_vec, &cpu_tensor);
+    TensorFromVector<int>(src_vec, &cpu_tensor);
 
     // Compare Tensors
     const int* cpu_ptr = cpu_tensor.data<int>();
@@ -126,7 +126,7 @@ TEST(CopyFromVector, Tensor) {
 
     src_vec.erase(src_vec.begin(), src_vec.begin() + 5);
     cpu_tensor.Resize(make_ddim({2, 2}));
-    CopyFromVector<int>(src_vec, &cpu_tensor);
+    TensorFromVector<int>(src_vec, &cpu_tensor);
     cpu_ptr = cpu_tensor.data<int>();
     src_ptr = src_vec.data();
     ASSERT_NE(src_ptr, cpu_ptr);
@@ -148,15 +148,15 @@ TEST(CopyFromVector, Tensor) {
     cpu_tensor.Resize(make_ddim({3, 3}));
     auto cpu_place = new paddle::platform::CPUPlace();
     CPUDeviceContext cpu_ctx(*cpu_place);
-    CopyFromVector<int>(src_vec, cpu_ctx, &cpu_tensor);
+    TensorFromVector<int>(src_vec, cpu_ctx, &cpu_tensor);
 
     // Copy to GPUTensor
     gpu_tensor.Resize(make_ddim({3, 3}));
     auto gpu_place = new paddle::platform::CUDAPlace();
     CUDADeviceContext gpu_ctx(*gpu_place);
-    CopyFromVector<int>(src_vec, gpu_ctx, &gpu_tensor);
+    TensorFromVector<int>(src_vec, gpu_ctx, &gpu_tensor);
     // Copy from GPU to CPU tensor for comparison
-    Copy(gpu_tensor, *cpu_place, gpu_ctx, &dst_tensor);
+    TensorCopy(gpu_tensor, *cpu_place, gpu_ctx, &dst_tensor);
 
     // Sync before Compare Tensors
     gpu_ctx.Wait();
@@ -173,10 +173,10 @@ TEST(CopyFromVector, Tensor) {
     src_vec.erase(src_vec.begin(), src_vec.begin() + 5);
 
     cpu_tensor.Resize(make_ddim({2, 2}));
-    CopyFromVector<int>(src_vec, cpu_ctx, &cpu_tensor);
+    TensorFromVector<int>(src_vec, cpu_ctx, &cpu_tensor);
     gpu_tensor.Resize(make_ddim({2, 2}));
-    CopyFromVector<int>(src_vec, gpu_ctx, &gpu_tensor);
-    Copy(gpu_tensor, *cpu_place, gpu_ctx, &dst_tensor);
+    TensorFromVector<int>(src_vec, gpu_ctx, &gpu_tensor);
+    TensorCopy(gpu_tensor, *cpu_place, gpu_ctx, &dst_tensor);
 
     // Sync before Compare Tensors
     gpu_ctx.Wait();
@@ -196,7 +196,7 @@ TEST(CopyFromVector, Tensor) {
 #endif
 }
 
-TEST(CopyToVector, Tensor) {
+TEST(TensorToVector, Tensor) {
   using namespace paddle::framework;
   using namespace paddle::platform;
   {
@@ -208,7 +208,7 @@ TEST(CopyToVector, Tensor) {
 
     CPUPlace place;
     std::vector<int> dst;
-    CopyToVector<int>(src, &dst);
+    TensorToVector<int>(src, &dst);
 
     for (int i = 0; i < 3 * 3; ++i) {
       EXPECT_EQ(src_ptr[i], dst[i]);
@@ -220,10 +220,10 @@ TEST(CopyToVector, Tensor) {
     Tensor gpu_tensor;
     CUDAPlace place;
     CUDADeviceContext gpu_ctx(place);
-    CopyFromVector<int>(src_vec, gpu_ctx, &gpu_tensor);
+    TensorFromVector<int>(src_vec, gpu_ctx, &gpu_tensor);
 
     std::vector<int> dst;
-    CopyToVector<int>(gpu_tensor, gpu_ctx, &dst);
+    TensorToVector<int>(gpu_tensor, gpu_ctx, &dst);
 
     for (int i = 0; i < 3 * 3; ++i) {
       EXPECT_EQ(src_vec[i], dst[i]);
@@ -232,7 +232,7 @@ TEST(CopyToVector, Tensor) {
 #endif
 }
 
-TEST(HasNAN, CPU) {
+TEST(TensorContainsNAN, CPU) {
   using namespace paddle::framework;
   using namespace paddle::platform;
   Tensor src;
@@ -240,11 +240,12 @@ TEST(HasNAN, CPU) {
   buf[0] = 0.0;
   buf[1] = NAN;
   buf[2] = 0.0;
-
-  ASSERT_TRUE(HasNAN(src));
+  ASSERT_TRUE(TensorContainsNAN(src));
+  buf[1] = 0.0;
+  ASSERT_FALSE(TensorContainsNAN(src));
 }
 
-TEST(HasInf, CPU) {
+TEST(TensorContainsInf, CPU) {
   using namespace paddle::framework;
   using namespace paddle::platform;
   Tensor src;
@@ -252,10 +253,12 @@ TEST(HasInf, CPU) {
   buf[0] = 1.0;
   buf[1] = INFINITY;
   buf[2] = 0.0;
-  ASSERT_TRUE(HasInf(src));
+  ASSERT_TRUE(TensorContainsInf(src));
+  buf[1] = 1.0;
+  ASSERT_FALSE(TensorContainsInf(src));
 }
 
-TEST(Tensor, SerializeAndDeserialize) {
+TEST(Tensor, FromAndToStream) {
   framework::Tensor src_tensor;
   int array[6] = {1, 2, 3, 4, 5, 6};
   src_tensor.Resize({2, 3});
@@ -268,10 +271,10 @@ TEST(Tensor, SerializeAndDeserialize) {
     auto place = new platform::CPUPlace();
     platform::CPUDeviceContext cpu_ctx(*place);
     std::ostringstream oss;
-    SerializeToStream(oss, src_tensor, cpu_ctx);
+    TensorToStream(oss, src_tensor, cpu_ctx);
 
     std::istringstream iss(oss.str());
-    DeserializeFromStream(iss, &dst_tensor, cpu_ctx);
+    TensorFromStream(iss, &dst_tensor, cpu_ctx);
     int* dst_ptr = dst_tensor.mutable_data<int>(platform::CPUPlace());
     for (int i = 0; i < 5; ++i) {
       ASSERT_EQ(dst_ptr[i], array[i]);
@@ -288,13 +291,13 @@ TEST(Tensor, SerializeAndDeserialize) {
     auto gpu_place = new platform::CUDAPlace();
     platform::CUDADeviceContext gpu_ctx(*gpu_place);
 
-    Copy(src_tensor, *gpu_place, gpu_ctx, &gpu_tensor);
+    TensorCopy(src_tensor, *gpu_place, gpu_ctx, &gpu_tensor);
 
     std::ostringstream oss;
-    SerializeToStream(oss, gpu_tensor, gpu_ctx);
+    TensorToStream(oss, gpu_tensor, gpu_ctx);
 
     std::istringstream iss(oss.str());
-    DeserializeFromStream(iss, &dst_tensor, gpu_ctx);
+    TensorFromStream(iss, &dst_tensor, gpu_ctx);
 
     int* dst_ptr = dst_tensor.mutable_data<int>(platform::CPUPlace());
     for (int i = 0; i < 6; ++i) {

paddle/fluid/framework/tensor_util_test.cu

@@ -31,7 +31,7 @@ static __global__ void FillInf(float* buf) {
   buf[2] = 0.5;
 }
 
-TEST(HasNAN, GPU) {
+TEST(TensorContainsNAN, GPU) {
   Tensor tensor;
   platform::CUDAPlace gpu(0);
   auto& pool = platform::DeviceContextPool::Instance();
@@ -39,10 +39,10 @@ TEST(HasNAN, GPU) {
   float* buf = tensor.mutable_data<float>({3}, gpu);
   FillNAN<<<1, 1, 0, cuda_ctx->stream()>>>(buf);
   cuda_ctx->Wait();
-  ASSERT_TRUE(HasNAN(tensor));
+  ASSERT_TRUE(TensorContainsNAN(tensor));
 }
 
-TEST(HasInf, GPU) {
+TEST(TensorContainsInf, GPU) {
   Tensor tensor;
   platform::CUDAPlace gpu(0);
   auto& pool = platform::DeviceContextPool::Instance();
@@ -50,7 +50,7 @@ TEST(HasInf, GPU) {
   float* buf = tensor.mutable_data<float>({3}, gpu);
   FillInf<<<1, 1, 0, cuda_ctx->stream()>>>(buf);
   cuda_ctx->Wait();
-  ASSERT_TRUE(HasInf(tensor));
+  ASSERT_TRUE(TensorContainsInf(tensor));
 }
 
 }  // namespace framework

paddle/fluid/framework/threadpool.h

@@ -64,7 +64,6 @@ class ThreadPool {
     Task task([fn]() -> std::unique_ptr<platform::EnforceNotMet> {
       try {
         fn();
-        return nullptr;
       } catch (platform::EnforceNotMet ex) {
         return std::unique_ptr<platform::EnforceNotMet>(
             new platform::EnforceNotMet(ex));
@@ -73,6 +72,7 @@ class ThreadPool {
             << "Unexpected exception is catched in thread pool. All "
                "throwable exception in Fluid should be an EnforceNotMet.";
       }
+      return nullptr;
     });
     std::future<std::unique_ptr<platform::EnforceNotMet>> f = task.get_future();
     tasks_.push(std::move(task));

paddle/fluid/operators/array_operator.h

@@ -42,7 +42,7 @@ class ArrayOp : public framework::OperatorBase {
     if (platform::is_gpu_place(i_tensor.place())) {
       // FIXME: Avoid copy from GPU to CPU
       framework::Tensor t;
-      framework::Copy(i_tensor, platform::CPUPlace(), dev_ctx, &t);
+      framework::TensorCopy(i_tensor, platform::CPUPlace(), dev_ctx, &t);
       dev_ctx.Wait();
       offset = static_cast<size_t>(*t.data<int64_t>());
     } else {

paddle/fluid/operators/array_to_lod_tensor_op.cc

@@ -112,8 +112,8 @@ class ArrayToLoDTensorOp : public framework::OperatorBase {
             platform::DeviceContextPool::Instance();
         auto &dev_ctx = *pool.Get(place);
 
-        framework::Copy(x[x_idx].Slice(start_offset, end_offset), place,
-                        dev_ctx, &slice);
+        framework::TensorCopy(x[x_idx].Slice(start_offset, end_offset), place,
+                              dev_ctx, &slice);
         out_offset += len;
       }
     }

paddle/fluid/operators/assign_op.cc

@@ -45,7 +45,7 @@ class AssignFunctor {
     out_rows.set_height(rows.height());
     auto &t = rows.value();
     auto *m = out_rows.mutable_value();
-    framework::Copy(t, t.place(), dev_ctx_, m);
+    framework::TensorCopy(t, t.place(), dev_ctx_, m);
   }
 
   template <typename T>
@@ -57,7 +57,7 @@ class AssignFunctor {
   void copy_tensor(const framework::LoDTensor &lod_tensor,
                    framework::LoDTensor *out) const {
     auto &out_tensor = *out;
-    Copy(lod_tensor, lod_tensor.place(), dev_ctx_, &out_tensor);
+    TensorCopy(lod_tensor, lod_tensor.place(), dev_ctx_, &out_tensor);
     out_tensor.set_lod(lod_tensor.lod());
   }
 

paddle/fluid/operators/assign_value_op.h

@@ -41,7 +41,7 @@ class AssignValueKernel : public framework::OpKernel<T> {
         break;
     }
     auto values = ctx.Attr<std::vector<T>>(value_name);
-    framework::CopyFromVector(values, ctx.device_context(), out);
+    framework::TensorFromVector(values, ctx.device_context(), out);
     out->Resize(framework::make_ddim(shape));
   }
 };

paddle/fluid/operators/beam_search_decode_op.h

@@ -232,12 +232,12 @@ void BeamSearchDecoder<T>::ConvertSentenceVectorToLodTensor(
   id_tensor->set_lod(lod);
   id_tensor->Resize({static_cast<int64_t>(id_data.size())});
   id_tensor->mutable_data<int64_t>(paddle::platform::CPUPlace());
-  framework::CopyFromVector<int64_t>(id_data, cpu_ctx, id_tensor);
+  framework::TensorFromVector<int64_t>(id_data, cpu_ctx, id_tensor);
 
   score_tensor->set_lod(lod);
   score_tensor->Resize({static_cast<int64_t>(score_data.size())});
   score_tensor->mutable_data<T>(paddle::platform::CPUPlace());
-  framework::CopyFromVector<T>(score_data, cpu_ctx, score_tensor);
+  framework::TensorFromVector<T>(score_data, cpu_ctx, score_tensor);
 }
 
 template <typename T>

paddle/fluid/operators/detection_output_op.h

 /* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
 
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-Indicesou may obtain a copy of the License at
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   Indicesou may obtain a copy of the License at
 
-    http://www.apache.org/licenses/LICENSE-2.0
+   http://www.apache.org/licenses/LICENSE-2.0
 
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License. */
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License. */
 
 #pragma once
 #include "paddle/fluid/framework/op_registry.h"
@@ -98,16 +98,16 @@ class DetectionOutputKernel : public framework::OpKernel<T> {
     T* conf_data = conf_tensor.data<T>();
     if (platform::is_gpu_place(context.GetPlace())) {
       loc_cpu.mutable_data<T>(loc_tensor.dims(), platform::CPUPlace());
-      framework::Copy(loc_tensor, platform::CPUPlace(),
-                      context.device_context(), &loc_cpu);
+      framework::TensorCopy(loc_tensor, platform::CPUPlace(),
+                            context.device_context(), &loc_cpu);
       loc_data = loc_cpu.data<T>();
       conf_cpu.mutable_data<T>(conf_tensor.dims(), platform::CPUPlace());
-      framework::Copy(conf_tensor, platform::CPUPlace(),
-                      context.device_context(), &conf_cpu);
+      framework::TensorCopy(conf_tensor, platform::CPUPlace(),
+                            context.device_context(), &conf_cpu);
       conf_data = conf_cpu.data<T>();
       priorbox_cpu.mutable_data<T>(in_priorbox->dims(), platform::CPUPlace());
-      framework::Copy(*in_priorbox, platform::CPUPlace(),
-                      context.device_context(), &priorbox_cpu);
+      framework::TensorCopy(*in_priorbox, platform::CPUPlace(),
+                            context.device_context(), &priorbox_cpu);
       priorbox_data = priorbox_cpu.data<T>();
     }
     // get decode bboxes
@@ -158,8 +158,8 @@ class DetectionOutputKernel : public framework::OpKernel<T> {
                                 batch_size, all_indices, all_decoded_bboxes,
                                 out_data);
     if (platform::is_gpu_place(context.GetPlace())) {
-      framework::Copy(out_cpu, platform::CUDAPlace(), context.device_context(),
-                      out);
+      framework::TensorCopy(out_cpu, platform::CUDAPlace(),
+                            context.device_context(), out);
     }
   }
 };

paddle/fluid/operators/expand_op.h

@@ -126,7 +126,8 @@ class ExpandGradKernel : public framework::OpKernel<T> {
       auto* in0 = context.Input<Tensor>(framework::GradVarName("Out"));
       auto* out0 = context.Output<Tensor>(framework::GradVarName("X"));
       out0->mutable_data<T>(context.GetPlace());
-      framework::Copy(*in0, context.GetPlace(), context.device_context(), out0);
+      framework::TensorCopy(*in0, context.GetPlace(), context.device_context(),
+                            out0);
     } else {
       switch (dims) {
         REP_EXPAND_GRAD_TEMPLATE(72)

paddle/fluid/operators/feed_op.cc

@@ -57,7 +57,7 @@ class FeedOp : public framework::OperatorBase {
     if (platform::is_same_place(feed_item.place(), place)) {
       out_item->ShareDataWith(feed_item);
     } else {
-      framework::Copy(feed_item, place, dev_ctx, out_item);
+      framework::TensorCopy(feed_item, place, dev_ctx, out_item);
     }
     out_item->set_lod(feed_item.lod());
   }

paddle/fluid/operators/fetch_op.cc

@@ -56,7 +56,7 @@ class FetchOp : public framework::OperatorBase {
     platform::DeviceContextPool &pool = platform::DeviceContextPool::Instance();
     auto &dev_ctx = *pool.Get(src_item.place());
 
-    Copy(src_item, platform::CPUPlace(), dev_ctx, &dst_item);
+    TensorCopy(src_item, platform::CPUPlace(), dev_ctx, &dst_item);
     dev_ctx.Wait();
     dst_item.set_lod(src_item.lod());
 

paddle/fluid/operators/fill_op.cc

@@ -75,7 +75,7 @@ class FillOp : public framework::OperatorBase {
       platform::DeviceContextPool &pool =
           platform::DeviceContextPool::Instance();
       auto &dev_ctx = *pool.Get(place);
-      framework::Copy(tensor, place, dev_ctx, &out);
+      framework::TensorCopy(tensor, place, dev_ctx, &out);
     }
   }
 };

paddle/fluid/operators/layer_norm_op.h

@@ -196,7 +196,7 @@ class LayerNormGradKernel : public framework::OpKernel<T> {
         // dy_dx
         ElementwiseComputeEx<MulFunctor<T>, DeviceContext, T>(
             ctx, &d_y, scale, /*axis*/ 1, MulFunctor<T>(), &temp);
-        framework::Copy(temp, ctx.GetPlace(), ctx.device_context(), d_x);
+        framework::TensorCopy(temp, ctx.GetPlace(), ctx.device_context(), d_x);
 
         // dy_dmean_dx
         row_mean(dev_ctx, temp, &temp_vec);
@@ -208,7 +208,7 @@ class LayerNormGradKernel : public framework::OpKernel<T> {
             ctx, &temp, &temp_norm, /*axis*/ 0, MulFunctor<T>(), &temp);
       } else {
         // dy_dx
-        framework::Copy(d_y, ctx.GetPlace(), ctx.device_context(), d_x);
+        framework::TensorCopy(d_y, ctx.GetPlace(), ctx.device_context(), d_x);
 
         // dy_dmean_dx
         row_mean(dev_ctx, d_y, &temp_vec);

paddle/fluid/operators/load_combine_op.cc

@@ -69,7 +69,7 @@ class LoadCombineOp : public framework::OperatorBase {
         out_var->Clear();
         tensor = out_var->GetMutable<framework::LoDTensor>();
         tensor->set_lod(cpu_tensor.lod());
-        Copy(cpu_tensor, place, dev_ctx, tensor);
+        TensorCopy(cpu_tensor, place, dev_ctx, tensor);
       }
     }
   }

paddle/fluid/operators/load_op.cc

@@ -55,7 +55,7 @@ class LoadOp : public framework::OperatorBase {
       out_var->Clear();
       tensor = out_var->GetMutable<framework::LoDTensor>();
       tensor->set_lod(cpu_tensor.lod());
-      Copy(cpu_tensor, place, dev_ctx, tensor);
+      TensorCopy(cpu_tensor, place, dev_ctx, tensor);
     }
   }
 };

paddle/fluid/operators/lod_reset_op.h

@@ -33,8 +33,8 @@ class LoDResetKernel : public framework::OpKernel<T> {
       auto* lod = lod_t->data<int>();
       if (platform::is_gpu_place(ctx.GetPlace())) {
         framework::Tensor lod_cpu;
-        framework::Copy(*lod_t, platform::CPUPlace(), ctx.device_context(),
-                        &lod_cpu);
+        framework::TensorCopy(*lod_t, platform::CPUPlace(),
+                              ctx.device_context(), &lod_cpu);
         lod = lod_cpu.data<int>();
       }
       level0 = std::vector<int>(lod, lod + lod_t->numel());

paddle/fluid/operators/lod_tensor_to_array_op.cc

@@ -94,9 +94,9 @@ class LoDTensorToArrayOp : public framework::OperatorBase {
             platform::DeviceContextPool::Instance();
         auto &dev_ctx = *pool.Get(place);
 
-        framework::Copy(x.Slice(static_cast<int>(each_range.begin),
-                                static_cast<int>(each_range.end)),
-                        x.place(), dev_ctx, &slice);
+        framework::TensorCopy(x.Slice(static_cast<int>(each_range.begin),
+                                      static_cast<int>(each_range.end)),
+                              x.place(), dev_ctx, &slice);
         offset += len;
       }
     }

paddle/fluid/operators/math/context_project.h

@@ -149,7 +149,8 @@ class ContextProjectFunctor {
             Tensor out_t_sub = out_t.Slice(k * context_length,
                                            k * context_length + padding_size);
             Tensor w_sub = padding_data.Slice(k, k + padding_size);
-            framework::Copy(w_sub, context.GetPlace(), context, &out_t_sub);
+            framework::TensorCopy(w_sub, context.GetPlace(), context,
+                                  &out_t_sub);
           }
         }
         if (down_pad > 0) {  // add down pad
@@ -179,7 +180,8 @@ class ContextProjectFunctor {
                 (down_pad_begin_row + t) * context_length);
             Tensor w_sub = padding_data.Slice(
                 up_pad + padding_idx, up_pad + padding_idx + padding_size);
-            framework::Copy(w_sub, context.GetPlace(), context, &out_t_sub);
+            framework::TensorCopy(w_sub, context.GetPlace(), context,
+                                  &out_t_sub);
           }
         }
         out_t.Resize({sequence_height, context_length * sequence_width});

paddle/fluid/operators/math/im2col_test.cc

@@ -62,7 +62,7 @@ void testIm2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     input = input_tmp;
   } else {
-    Copy(input_tmp, *place, *context, &input);
+    TensorCopy(input_tmp, *place, *context, &input);
   }
   output_cfo.mutable_data<float>(
       {1, filter_size, filter_size, output_height, output_width}, *place);
@@ -87,7 +87,7 @@ void testIm2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     out_cfo_ptr = output_cfo.data<float>();
   } else {
-    Copy(output_cfo, paddle::platform::CPUPlace(), *context, &output_tmp);
+    TensorCopy(output_cfo, paddle::platform::CPUPlace(), *context, &output_tmp);
     out_cfo_ptr = output_tmp.data<float>();
   }
   for (int i = 0; i < 6; ++i) {
@@ -98,7 +98,7 @@ void testIm2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     out_ocf_ptr = output_ocf.data<float>();
   } else {
-    Copy(output_ocf, paddle::platform::CPUPlace(), *context, &output_tmp);
+    TensorCopy(output_ocf, paddle::platform::CPUPlace(), *context, &output_tmp);
     out_ocf_ptr = output_tmp.data<float>();
   }
 
@@ -119,7 +119,7 @@ void testIm2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     input = input_tmp;
   } else {
-    Copy(input_tmp, *place, *context, &input);
+    TensorCopy(input_tmp, *place, *context, &input);
   }
 
   col2im(*context, output_cfo, dilation, stride, padding, &input);
@@ -128,7 +128,7 @@ void testIm2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     in_ptr = input.data<float>();
   } else {
-    Copy(input, paddle::platform::CPUPlace(), *context, &input_tmp);
+    TensorCopy(input, paddle::platform::CPUPlace(), *context, &input_tmp);
     in_ptr = input_tmp.data<float>();
   }
   for (int i = 0; i < 6; ++i) {
@@ -140,7 +140,7 @@ void testIm2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     input = input_tmp;
   } else {
-    Copy(input_tmp, *place, *context, &input);
+    TensorCopy(input_tmp, *place, *context, &input);
   }
 
   col2im_ocf(*context, output_ocf, dilation, stride, padding, &input);
@@ -148,7 +148,7 @@ void testIm2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     in_ptr = input.data<float>();
   } else {
-    Copy(input, paddle::platform::CPUPlace(), *context, &input_tmp);
+    TensorCopy(input, paddle::platform::CPUPlace(), *context, &input_tmp);
     in_ptr = input_tmp.data<float>();
   }
   for (int i = 0; i < 6; ++i) {

paddle/fluid/operators/math/math_function_test.cu

@@ -29,15 +29,15 @@ TEST(math_function, notrans_mul_trans) {
   auto* gpu_place = new paddle::platform::CUDAPlace(0);
   paddle::platform::CUDADeviceContext context(*gpu_place);
 
-  paddle::framework::Copy(input1, *gpu_place, context, &input1_gpu);
-  paddle::framework::Copy(input1, *gpu_place, context, &input2_gpu);
+  paddle::framework::TensorCopy(input1, *gpu_place, context, &input1_gpu);
+  paddle::framework::TensorCopy(input1, *gpu_place, context, &input2_gpu);
 
   out_gpu.mutable_data<float>({2, 2}, *gpu_place);
 
   paddle::operators::math::matmul<paddle::platform::CUDADeviceContext, float>(
       context, input1_gpu, false, input2_gpu, true, 1, &out_gpu, 0);
 
-  paddle::framework::Copy(out_gpu, *cpu_place, context, &out);
+  paddle::framework::TensorCopy(out_gpu, *cpu_place, context, &out);
 
   float* out_ptr = out.data<float>();
   context.Wait();
@@ -63,15 +63,15 @@ TEST(math_function, trans_mul_notrans) {
   auto* gpu_place = new paddle::platform::CUDAPlace(0);
   paddle::platform::CUDADeviceContext context(*gpu_place);
 
-  paddle::framework::Copy(input1, *gpu_place, context, &input1_gpu);
-  paddle::framework::Copy(input1, *gpu_place, context, &input2_gpu);
+  paddle::framework::TensorCopy(input1, *gpu_place, context, &input1_gpu);
+  paddle::framework::TensorCopy(input1, *gpu_place, context, &input2_gpu);
 
   out_gpu.mutable_data<float>({3, 3}, *gpu_place);
 
   paddle::operators::math::matmul<paddle::platform::CUDADeviceContext, float>(
       context, input1_gpu, true, input2_gpu, false, 1, &out_gpu, 0);
 
-  paddle::framework::Copy(out_gpu, *cpu_place, context, &out);
+  paddle::framework::TensorCopy(out_gpu, *cpu_place, context, &out);
 
   float* out_ptr = out.data<float>();
   context.Wait();
@@ -112,9 +112,9 @@ TEST(math_function, gemm_notrans_cublas) {
   auto* gpu_place = new paddle::platform::CUDAPlace(0);
   paddle::platform::CUDADeviceContext context(*gpu_place);
 
-  paddle::framework::Copy(input1, *gpu_place, context, &input1_gpu);
-  paddle::framework::Copy(input2, *gpu_place, context, &input2_gpu);
-  paddle::framework::Copy(input3, *gpu_place, context, &input3_gpu);
+  paddle::framework::TensorCopy(input1, *gpu_place, context, &input1_gpu);
+  paddle::framework::TensorCopy(input2, *gpu_place, context, &input2_gpu);
+  paddle::framework::TensorCopy(input3, *gpu_place, context, &input3_gpu);
   float* a = input1_gpu.data<float>();
   float* b = input2_gpu.data<float>();
   float* c = input3_gpu.mutable_data<float>(*gpu_place);
@@ -122,7 +122,7 @@ TEST(math_function, gemm_notrans_cublas) {
   paddle::operators::math::gemm<paddle::platform::CUDADeviceContext, float>(
       context, false, false, m, n, k, 1, a, 3, b + 1, 4, 1, c + 1, 4);
 
-  paddle::framework::Copy(input3_gpu, *cpu_place, context, &input3);
+  paddle::framework::TensorCopy(input3_gpu, *cpu_place, context, &input3);
 
   // numpy code:
   // a = np.arange(6).reshape(2, 3)
@@ -167,9 +167,9 @@ TEST(math_function, gemm_trans_cublas) {
   auto* gpu_place = new paddle::platform::CUDAPlace(0);
   paddle::platform::CUDADeviceContext context(*gpu_place);
 
-  paddle::framework::Copy(input1, *gpu_place, context, &input1_gpu);
-  paddle::framework::Copy(input2, *gpu_place, context, &input2_gpu);
-  paddle::framework::Copy(input3, *gpu_place, context, &input3_gpu);
+  paddle::framework::TensorCopy(input1, *gpu_place, context, &input1_gpu);
+  paddle::framework::TensorCopy(input2, *gpu_place, context, &input2_gpu);
+  paddle::framework::TensorCopy(input3, *gpu_place, context, &input3_gpu);
   float* a = input1_gpu.data<float>();
   float* b = input2_gpu.data<float>();
   float* c = input3_gpu.mutable_data<float>(*gpu_place);
@@ -177,7 +177,7 @@ TEST(math_function, gemm_trans_cublas) {
   paddle::operators::math::gemm<paddle::platform::CUDADeviceContext, float>(
       context, false, true, m, n, k, 1, a, 3, b + 3, 3, 1, c + 1, 4);
 
-  paddle::framework::Copy(input3_gpu, *cpu_place, context, &input3);
+  paddle::framework::TensorCopy(input3_gpu, *cpu_place, context, &input3);
   context.Wait();
 
   EXPECT_EQ(input3_ptr[0], 0);
@@ -218,15 +218,15 @@ void GemvTest(int m, int n, bool trans) {
   }
 
   paddle::platform::CUDADeviceContext context(*gpu_place);
-  paddle::framework::Copy(mat_a, *gpu_place, context, &g_mat_a);
-  paddle::framework::Copy(vec_b, *gpu_place, context, &g_vec_b);
+  paddle::framework::TensorCopy(mat_a, *gpu_place, context, &g_mat_a);
+  paddle::framework::TensorCopy(vec_b, *gpu_place, context, &g_vec_b);
 
   paddle::operators::math::gemv<paddle::platform::CUDADeviceContext, T>(
       context, trans, static_cast<int>(m), static_cast<int>(n), 1., g_data_a,
       g_data_b, 0., g_data_c);
 
-  paddle::framework::Copy(g_vec_c, paddle::platform::CPUPlace(), context,
-                          &vec_c);
+  paddle::framework::TensorCopy(g_vec_c, paddle::platform::CPUPlace(), context,
+                                &vec_c);
 
   if (!trans) {
     for (int i = 0; i < m; ++i) {

paddle/fluid/operators/math/selected_rows_functor_test.cu

@@ -67,7 +67,7 @@ TEST(selected_rows_functor, gpu_add) {
   EXPECT_EQ(out_rows[6], 9);
 
   Tensor out_cpu;
-  Copy(*out_value, cpu_place, ctx, &out_cpu);
+  TensorCopy(*out_value, cpu_place, ctx, &out_cpu);
   ctx.Wait();
 
   auto* out_cpu_data = out_cpu.data<float>();
@@ -94,7 +94,7 @@ TEST(selected_rows_functor, gpu_add) {
   add_tensor_functor(ctx, *output, *tensor1, tensor2.get());
 
   Tensor tensor2_cpu;
-  Copy(*tensor2, cpu_place, ctx, &tensor2_cpu);
+  TensorCopy(*tensor2, cpu_place, ctx, &tensor2_cpu);
   ctx.Wait();
 
   auto* tensor2_cpu_data = tensor2_cpu.data<float>();
@@ -167,7 +167,7 @@ TEST(selected_rows_functor, gpu_add_to) {
   EXPECT_EQ(out_rows[6], 9);
 
   Tensor out_cpu;
-  Copy(*out_value, cpu_place, ctx, &out_cpu);
+  TensorCopy(*out_value, cpu_place, ctx, &out_cpu);
   ctx.Wait();
 
   auto* out_cpu_data = out_cpu.data<float>();
@@ -191,7 +191,7 @@ TEST(selected_rows_functor, gpu_add_to) {
   add_to_tensor_functor(ctx, *output, tensor1.get());
 
   Tensor tensor1_cpu;
-  Copy(*tensor1, cpu_place, ctx, &tensor1_cpu);
+  TensorCopy(*tensor1, cpu_place, ctx, &tensor1_cpu);
   ctx.Wait();
 
   auto* tensor1_cpu_data = tensor1_cpu.data<float>();

paddle/fluid/operators/math/sequence_padding.cu

@@ -97,7 +97,7 @@ class PaddingLoDTensorFunctor<platform::CUDADeviceContext, T> {
                       "width of sequence in LoDTensor seq.");
 
     if (!norm_by_times && num_sequences == 1UL) {
-      Copy(seq, context.GetPlace(), context, &padding);
+      TensorCopy(seq, context.GetPlace(), context, &padding);
       padding.Resize(padding_dims);
       return;
     }
@@ -172,7 +172,7 @@ class UnpaddingLoDTensorFunctor<platform::CUDADeviceContext, T> {
                       "width of sequence in LoDTensor seq.");
 
     if (!norm_by_times && num_sequences == 1UL) {
-      Copy(padding, context.GetPlace(), context, &seq);
+      TensorCopy(padding, context.GetPlace(), context, &seq);
       seq.Resize(seq_dims);
       return;
     }

paddle/fluid/operators/math/sequence_padding_test.cc

@@ -40,7 +40,7 @@ void TestSequencePadding(const paddle::framework::LoD& lod,
   if (paddle::platform::is_cpu_place(*place)) {
     seq = cpu_seq;
   } else {
-    Copy(cpu_seq, *place, *context, &seq);
+    TensorCopy(cpu_seq, *place, *context, &seq);
     seq.set_lod(lod);
   }
 
@@ -63,7 +63,7 @@ void TestSequencePadding(const paddle::framework::LoD& lod,
   if (paddle::platform::is_cpu_place(*place)) {
     cpu_seq_back = seq_back;
   } else {
-    Copy(seq_back, paddle::platform::CPUPlace(), *context, &cpu_seq_back);
+    TensorCopy(seq_back, paddle::platform::CPUPlace(), *context, &cpu_seq_back);
     cpu_seq_back.set_lod(lod);
   }
 

paddle/fluid/operators/math/vol2col_test.cc

@@ -71,7 +71,7 @@ void testVol2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     input = input_tmp;
   } else {
-    Copy(input_tmp, *place, *context, &input);
+    paddle::framework::TensorCopy(input_tmp, *place, *context, &input);
   }
   output.mutable_data<float>({1, filter_size, filter_size, filter_size,
                               output_depth, output_height, output_width},
@@ -85,7 +85,7 @@ void testVol2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     out_cfo_ptr = output.data<float>();
   } else {
-    Copy(output, paddle::platform::CPUPlace(), *context, &output_tmp);
+    TensorCopy(output, paddle::platform::CPUPlace(), *context, &output_tmp);
     out_cfo_ptr = output_tmp.data<float>();
   }
 
@@ -99,7 +99,7 @@ void testVol2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     input = input_tmp;
   } else {
-    Copy(input_tmp, *place, *context, &input);
+    TensorCopy(input_tmp, *place, *context, &input);
   }
 
   paddle::operators::math::Col2VolFunctor<DeviceContext, float> col2vol;
@@ -109,7 +109,7 @@ void testVol2col() {
   if (paddle::platform::is_cpu_place(*place)) {
     in_ptr = input.data<float>();
   } else {
-    Copy(input, paddle::platform::CPUPlace(), *context, &input_tmp);
+    TensorCopy(input, paddle::platform::CPUPlace(), *context, &input_tmp);
     in_ptr = input_tmp.data<float>();
   }
 

paddle/fluid/operators/merge_lod_tensor_op.cc

@@ -51,7 +51,8 @@ class MergeLoDTensorOp : public framework::OperatorBase {
       cpu_mask->ShareDataWith(mask);
     } else if (platform::is_gpu_place(mask.place())) {
 #ifdef PADDLE_WITH_CUDA
-      framework::Copy(mask, platform::CPUPlace(), dev_ctx, cpu_mask.get());
+      framework::TensorCopy(mask, platform::CPUPlace(), dev_ctx,
+                            cpu_mask.get());
 #else
       PADDLE_THROW("Not supported GPU, Please compile WITH_GPU option");
 #endif
@@ -106,8 +107,8 @@ class MergeLoDTensorOp : public framework::OperatorBase {
         continue;
       }
       auto slice = out->Slice(out_offset, out_offset + len);
-      framework::Copy(input->Slice(start_offset, end_offset), place, dev_ctx,
-                      &slice);
+      framework::TensorCopy(input->Slice(start_offset, end_offset), place,
+                            dev_ctx, &slice);
       out_offset += len;
       (*in_idx) += 1;
     }

paddle/fluid/operators/mine_hard_examples_op.cc

@@ -67,7 +67,8 @@ class MineHardExamplesKernel : public framework::OpKernel<T> {
     auto out_match_indices =
         ctx.Output<framework::Tensor>("UpdatedMatchIndices");
 
-    framework::Copy(*in_matched_indices, ctx.GetPlace(), out_match_indices);
+    framework::TensorCopy(*in_matched_indices, ctx.GetPlace(),
+                          out_match_indices);
 
     int batch_size = in_matched_indices->dims()[0];
     int prior_num = in_matched_indices->dims()[1];

paddle/fluid/operators/multiplex_op.cu

@@ -33,7 +33,7 @@ class MultiplexGPUKernel : public framework::OpKernel<T> {
     auto cols = ins[0]->numel() / rows;
     // copy index to cpu
     Tensor index_t_cpu;
-    Copy(*ids, platform::CPUPlace(), ctx.device_context(), &index_t_cpu);
+    TensorCopy(*ids, platform::CPUPlace(), ctx.device_context(), &index_t_cpu);
     auto* index = index_t_cpu.data<int32_t>();
     auto stream = ctx.cuda_device_context().stream();
     platform::CUDAPlace place = boost::get<platform::CUDAPlace>(ctx.GetPlace());
@@ -69,7 +69,7 @@ class MultiplexGradGPUKernel : public framework::OpKernel<T> {
     auto cols = ins[0]->numel() / rows;
     // copy index to cpu
     Tensor index_t_cpu;
-    Copy(*ids, platform::CPUPlace(), ctx.device_context(), &index_t_cpu);
+    TensorCopy(*ids, platform::CPUPlace(), ctx.device_context(), &index_t_cpu);
     auto* index = index_t_cpu.data<int32_t>();
 
     auto stream = ctx.cuda_device_context().stream();

paddle/fluid/operators/nccl_op_test.cu.cc

@@ -98,7 +98,7 @@ class NCCLTester : public ::testing::Test {
       send_tensor->mutable_data<T>(kDims, place);
 
       std::vector<T> send_vector(f::product(kDims), gpu_id);
-      paddle::framework::CopyFromVector<T>(send_vector, *ctx, send_tensor);
+      paddle::framework::TensorFromVector<T>(send_vector, *ctx, send_tensor);
       ctx->Wait();
       VLOG(1) << "Send Tensor filled with elements " << send_tensor->numel();
     }

paddle/fluid/operators/parallel_do_op.cc

@@ -78,7 +78,7 @@ inline void CopyOrShare(const framework::Variable &src,
       dst->GetMutable<LoDTensor>()->ShareDataWith(src.Get<LoDTensor>());
       dst->GetMutable<LoDTensor>()->set_lod(src.Get<LoDTensor>().lod());
     } else {
-      Copy(src.Get<LoDTensor>(), dst_place, dst->GetMutable<LoDTensor>());
+      TensorCopy(src.Get<LoDTensor>(), dst_place, dst->GetMutable<LoDTensor>());
     }
   } else if (src.IsType<SelectedRows>()) {
     auto &src_sr = src.Get<SelectedRows>();
@@ -88,7 +88,7 @@ inline void CopyOrShare(const framework::Variable &src,
       dst_sr->mutable_value()->ShareDataWith(src_sr.value());
       dst_sr->set_rows(src_sr.rows());
     } else {
-      Copy(src_sr.value(), dst_place, dst_sr->mutable_value());
+      TensorCopy(src_sr.value(), dst_place, dst_sr->mutable_value());
     }
   } else {
     PADDLE_THROW("Expect LoDTensor/SelectedRows, get %s", src.Type().name());
@@ -146,7 +146,7 @@ class ParallelDoOp : public framework::OperatorBase {
         auto &place = places[i];
         auto *sub_scope = sub_scopes[i];
         auto *dst = sub_scope->Var(param)->GetMutable<LoDTensor>();
-        framework::Copy(src, place, dst);
+        framework::TensorCopy(src, place, dst);
       }
     }
     WaitOnPlaces(places);

paddle/fluid/operators/print_op.cc

@@ -179,7 +179,7 @@ class TensorPrintOp : public framework::OperatorBase {
     } else {
       // copy data to cpu to print
       platform::CPUPlace place;
-      framework::Copy(in_tensor, place, &printed_tensor);
+      framework::TensorCopy(in_tensor, place, &printed_tensor);
     }
 
     Formater formater;

paddle/fluid/operators/recurrent_op.cc

@@ -291,7 +291,7 @@ class RecurrentOp : public RecurrentBase {
             auto dst_out = dst_tensor->Slice(seq_offset, seq_offset + 1);
             // Explicit copy output since the local RNN scope can be destroyed
             // early.
-            framework::Copy(src_tensor, place, dev_ctx, &dst_out);
+            framework::TensorCopy(src_tensor, place, dev_ctx, &dst_out);
           });
 
       scopes.Next();
@@ -378,7 +378,7 @@ class RecurrentGradOp : public RecurrentBase {
           auto *cur_grad_var = cur_scope.Var(cur_grad);
           auto cur_grad_tensor =
               cur_grad_var->GetMutable<framework::LoDTensor>();
-          framework::Copy(ex_tensor, place, dev_ctx, cur_grad_tensor);
+          framework::TensorCopy(ex_tensor, place, dev_ctx, cur_grad_tensor);
         }
       }
 
@@ -452,7 +452,7 @@ class RecurrentGradOp : public RecurrentBase {
             }
 
             auto dst = outside->Slice(seq_offset, seq_offset + 1);
-            framework::Copy(inside, place, dev_ctx, &dst);
+            framework::TensorCopy(inside, place, dev_ctx, &dst);
           });
       VLOG(5) << "Link outside gradient finished ";
 
@@ -465,7 +465,7 @@ class RecurrentGradOp : public RecurrentBase {
                 framework::LoDTensor *outside) {
               outside->Resize(inside.dims());
               outside->mutable_data(place, inside.type());
-              framework::Copy(inside, place, dev_ctx, outside);
+              framework::TensorCopy(inside, place, dev_ctx, outside);
             });
         VLOG(5) << "Link initialize state gradient finished ";
       }

paddle/fluid/operators/reorder_lod_tensor_by_rank_op.cc

@@ -170,7 +170,7 @@ class ReorderLoDTensorByRankTableBase : public framework::OperatorBase {
 
     platform::DeviceContextPool &pool = platform::DeviceContextPool::Instance();
     auto &dev_ctx = *pool.Get(place);
-    framework::Copy(x_sliced, out_sliced.place(), dev_ctx, &out_sliced);
+    framework::TensorCopy(x_sliced, out_sliced.place(), dev_ctx, &out_sliced);
     out_offset += len;
     return out_offset;
   }

paddle/fluid/operators/reshape_op.h

@@ -28,7 +28,7 @@ class ReshapeKernel : public framework::OpKernel<T> {
     auto* in = ctx.Input<framework::Tensor>("X");
     auto out_dims = out->dims();
     out->mutable_data<T>(ctx.GetPlace());
-    framework::Copy(*in, ctx.GetPlace(), ctx.device_context(), out);
+    framework::TensorCopy(*in, ctx.GetPlace(), ctx.device_context(), out);
     out->Resize(out_dims);
   }
 };
@@ -42,7 +42,7 @@ class ReshapeGradKernel : public framework::OpKernel<T> {
     d_x->mutable_data<T>(ctx.GetPlace());
 
     auto in_dims = d_x->dims();
-    framework::Copy(*d_out, ctx.GetPlace(), ctx.device_context(), d_x);
+    framework::TensorCopy(*d_out, ctx.GetPlace(), ctx.device_context(), d_x);
     d_x->Resize(in_dims);
   }
 };

paddle/fluid/operators/sequence_reshape_op.h

@@ -61,7 +61,7 @@ class SequenceReshapeKernel : public framework::OpKernel<T> {
       }
     }
 
-    framework::Copy(*in, context.GetPlace(), out);
+    framework::TensorCopy(*in, context.GetPlace(), out);
     out->Resize({static_cast<int64_t>(out->lod()[0].back()), out_width});
   }
 };
@@ -77,7 +77,7 @@ class SequenceReshapeGradKernel : public framework::OpKernel<T> {
         context.Output<LoDTensor>(framework::GradVarName("X"));
 
     xg_tensor_ptr->mutable_data<T>(context.GetPlace());
-    framework::Copy(*outg_tensor_ptr, context.GetPlace(), xg_tensor_ptr);
+    framework::TensorCopy(*outg_tensor_ptr, context.GetPlace(), xg_tensor_ptr);
     xg_tensor_ptr->Resize(x_tensor_ptr->dims());
   }
 };

paddle/fluid/operators/sequence_slice_op.h

@@ -66,13 +66,13 @@ class SequenceSliceOpKernel : public framework::OpKernel<T> {
 
     if (platform::is_gpu_place(ctx.GetPlace())) {
       offset_cpu.mutable_data<T>(offset->dims(), platform::CPUPlace());
-      framework::Copy(*offset, platform::CPUPlace(), ctx.device_context(),
-                      &offset_cpu);
+      framework::TensorCopy(*offset, platform::CPUPlace(), ctx.device_context(),
+                            &offset_cpu);
       offset_data = offset_cpu.data<int64_t>();
 
       length_cpu.mutable_data<T>(length->dims(), platform::CPUPlace());
-      framework::Copy(*length, platform::CPUPlace(), ctx.device_context(),
-                      &length_cpu);
+      framework::TensorCopy(*length, platform::CPUPlace(), ctx.device_context(),
+                            &length_cpu);
       length_data = length_cpu.data<int64_t>();
     }
 
@@ -127,13 +127,13 @@ class SequenceSliceGradOpKernel : public framework::OpKernel<T> {
 
     if (platform::is_gpu_place(ctx.GetPlace())) {
       offset_cpu.mutable_data<T>(offset->dims(), platform::CPUPlace());
-      framework::Copy(*offset, platform::CPUPlace(), ctx.device_context(),
-                      &offset_cpu);
+      framework::TensorCopy(*offset, platform::CPUPlace(), ctx.device_context(),
+                            &offset_cpu);
       offset_data = offset_cpu.data<int64_t>();
 
       length_cpu.mutable_data<T>(length->dims(), platform::CPUPlace());
-      framework::Copy(*length, platform::CPUPlace(), ctx.device_context(),
-                      &length_cpu);
+      framework::TensorCopy(*length, platform::CPUPlace(), ctx.device_context(),
+                            &length_cpu);
       length_data = length_cpu.data<int64_t>();
     }
 

paddle/fluid/operators/shrink_rnn_memory_op.cc

@@ -133,7 +133,7 @@ class ShrinkRNNMemoryGradOp : public ArrayOp {
       auto &dout_tensor = dout_var->Get<framework::LoDTensor>();
       auto height = dout_tensor.dims()[0];
       auto slice = dx_tensor.Slice(0, static_cast<int>(height));
-      framework::Copy(dout_tensor, dout_tensor.place(), dev_ctx, &slice);
+      framework::TensorCopy(dout_tensor, dout_tensor.place(), dev_ctx, &slice);
       if (dx_tensor.dims()[0] > height) {
         auto rest_tensor = dx_tensor.Slice(
             static_cast<int>(height), static_cast<int>(dx_tensor.dims()[0]));

paddle/fluid/operators/split_lod_tensor_op.cc

@@ -55,7 +55,8 @@ class SplitLoDTensorOp : public framework::OperatorBase {
       cpu_mask->ShareDataWith(mask);
     } else if (platform::is_gpu_place(mask.place())) {
 #ifdef PADDLE_WITH_CUDA
-      framework::Copy(mask, platform::CPUPlace(), dev_ctx, cpu_mask.get());
+      framework::TensorCopy(mask, platform::CPUPlace(), dev_ctx,
+                            cpu_mask.get());
 #else
       PADDLE_THROW("Not supported GPU, Please compile WITH_GPU option");
 #endif
@@ -113,9 +114,9 @@ class SplitLoDTensorOp : public framework::OperatorBase {
         // out[offset: offset+len] = x[each_range.begin: each_range.end]
         auto slice = out->Slice(static_cast<int>(offset),
                                 static_cast<int>(offset + len));
-        framework::Copy(x.Slice(static_cast<int>(each_range.begin),
-                                static_cast<int>(each_range.end)),
-                        x.place(), dev_ctx, &slice);
+        framework::TensorCopy(x.Slice(static_cast<int>(each_range.begin),
+                                      static_cast<int>(each_range.end)),
+                              x.place(), dev_ctx, &slice);
         offset += len;
       }
     }

paddle/fluid/operators/sum_op.h

@@ -137,8 +137,8 @@ class SumKernel : public framework::OpKernel<T> {
               out_array.resize(i + 1);
             }
             if (out_array[i].numel() == 0) {
-              framework::Copy(in_array[i], in_array[i].place(),
-                              context.device_context(), &out_array[i]);
+              framework::TensorCopy(in_array[i], in_array[i].place(),
+                                    context.device_context(), &out_array[i]);
               out_array[i].set_lod(in_array[i].lod());
             } else {
               PADDLE_ENFORCE(out_array[i].lod() == in_array[i].lod());

paddle/fluid/operators/tensor_array_read_write_op.cc

@@ -45,7 +45,7 @@ class WriteToArrayOp : public ArrayOp {
           platform::DeviceContextPool::Instance();
       auto &dev_ctx = *pool.Get(place);
 
-      Copy(x_tensor, place, dev_ctx, out_tensor);
+      TensorCopy(x_tensor, place, dev_ctx, out_tensor);
       out_tensor->set_lod(x_tensor.lod());
     } else {
       VLOG(10) << "WARNING: The input tensor 'x_tensor' holds no memory, so "
@@ -138,7 +138,7 @@ class ReadFromArrayOp : public ArrayOp {
       platform::DeviceContextPool &pool =
           platform::DeviceContextPool::Instance();
       auto &dev_ctx = *pool.Get(place);
-      framework::Copy(x_array[offset], place, dev_ctx, out_tensor);
+      framework::TensorCopy(x_array[offset], place, dev_ctx, out_tensor);
       out_tensor->set_lod(x_array[offset].lod());
     } else {
       VLOG(10) << "offset " << offset << " >= " << x_array.size();

paddle/fluid/operators/warpctc_op.h

@@ -185,7 +185,8 @@ class WarpCTCKernel : public framework::OpKernel<T> {
 
     // warpctc accesses labels in CPU memory
     Tensor warpctc_label;
-    Copy(*label, platform::CPUPlace(), ctx.device_context(), &warpctc_label);
+    TensorCopy(*label, platform::CPUPlace(), ctx.device_context(),
+               &warpctc_label);
     const int* warpctc_label_data = warpctc_label.data<int>();
     // warpctc stores loss in CPU memory
     Tensor warpctc_loss;
@@ -200,7 +201,7 @@ class WarpCTCKernel : public framework::OpKernel<T> {
         sequence_width, num_sequences, blank, warpctc_loss_data);
 
     // Copy the loss back
-    Copy(warpctc_loss, ctx.GetPlace(), ctx.device_context(), loss);
+    TensorCopy(warpctc_loss, ctx.GetPlace(), ctx.device_context(), loss);
   }
 };
 

paddle/fluid/pybind/tensor_py.h

@@ -101,7 +101,7 @@ T TensorGetElement(framework::Tensor &self, size_t offset) {
     return self.data<T>()[offset];
   } else {
     std::shared_ptr<framework::Tensor> dst(new framework::Tensor);
-    framework::Copy(self, platform::CPUPlace(), dst.get());
+    framework::TensorCopy(self, platform::CPUPlace(), dst.get());
     return dst->data<T>()[offset];
   }
 }
@@ -111,9 +111,9 @@ template <typename T>
 void TensorSetElement(framework::Tensor &self, size_t offset, T elem) {
   if (platform::is_gpu_place(self.place())) {
     std::shared_ptr<framework::Tensor> dst(new framework::Tensor);
-    framework::Copy(self, platform::CPUPlace(), dst.get());
+    framework::TensorCopy(self, platform::CPUPlace(), dst.get());
     dst->data<T>()[offset] = elem;
-    framework::Copy(*dst.get(), self.place(), &self);
+    framework::TensorCopy(*dst.get(), self.place(), &self);
 
   } else if (platform::is_cpu_place(self.place())) {
     self.data<T>()[offset] = elem;

python/paddle/v2/fluid/layers/nn.py

@@ -68,6 +68,7 @@ __all__ = [
     'layer_norm',
     'softmax_with_cross_entropy',
     'smooth_l1',
+    'one_hot',
 ]
 
 
@@ -3212,3 +3213,40 @@ def smooth_l1(x, y, inside_weight=None, outside_weight=None, sigma=None):
                  'Out': loss},
         attrs={'sigma': sigma})
     return loss
+
+
+def one_hot(input, depth):
+    """
+    One Hot Operator. This operator creates the one-hot representations for input
+    index values. The following example will help to explain the function of this
+    operator.
+
+    Args:
+        input(Tensor/LodTensor):  A Tensor/LodTensor of indices, last dimension must be 1.
+        depth(scalar): an interger defining the depth of the one hot dimension.
+
+    Returns:
+         The one-hot tensor or LodTensor, same as input.
+
+    Examples:
+        X is a LoDTensor:
+          X.lod = [[0, 1, 4]]
+          X.shape = [4, 1]
+          X.data = [[1], [1], [3], [0]]
+        set depth = 4
+        Out is a LoDTensor:
+          Out.lod = [[0, 1, 4]]
+          Out.shape = [4, 4]
+          Out.data = [[0., 1., 0., 0.],
+                      [0., 1., 0., 0.],
+                      [0., 0., 0., 1.],
+                      [1., 0., 0., 0.]]
+    """
+    helper = LayerHelper("one_hot", **locals())
+    one_hot_out = helper.create_tmp_variable(dtype='float32')
+    helper.append_op(
+        type="one_hot",
+        inputs={'X': input},
+        attrs={'depth': depth},
+        outputs={'Out': one_hot_out})
+    return one_hot_out