diff --git a/paddle/fluid/API.spec b/paddle/fluid/API.spec
index da835b33051c310064a906612ae7f9362f95c7d5..da8941c351571a8ff43974321490065079c2c0b4 100644
--- a/paddle/fluid/API.spec
+++ b/paddle/fluid/API.spec
@@ -93,11 +93,11 @@ paddle.fluid.layers.edit_distance ArgSpec(args=['input', 'label', 'normalized',
 paddle.fluid.layers.l2_normalize ArgSpec(args=['x', 'axis', 'epsilon', 'name'], varargs=None, keywords=None, defaults=(1e-12, None))
 paddle.fluid.layers.matmul ArgSpec(args=['x', 'y', 'transpose_x', 'transpose_y', 'alpha', 'name'], varargs=None, keywords=None, defaults=(False, False, 1.0, None))
 paddle.fluid.layers.topk ArgSpec(args=['input', 'k', 'name'], varargs=None, keywords=None, defaults=(None,))
-paddle.fluid.layers.warpctc ArgSpec(args=['input', 'label', 'blank', 'norm_by_times'], varargs=None, keywords=None, defaults=(0, False))
+paddle.fluid.layers.warpctc ArgSpec(args=['input', 'label', 'blank', 'norm_by_times', 'use_cudnn'], varargs=None, keywords=None, defaults=(0, False, False))
 paddle.fluid.layers.sequence_reshape ArgSpec(args=['input', 'new_dim'], varargs=None, keywords=None, defaults=None)
 paddle.fluid.layers.transpose ArgSpec(args=['x', 'perm', 'name'], varargs=None, keywords=None, defaults=(None,))
 paddle.fluid.layers.im2sequence ArgSpec(args=['input', 'filter_size', 'stride', 'padding', 'input_image_size', 'out_stride', 'name'], varargs=None, keywords=None, defaults=(1, 1, 0, None, 1, None))
-paddle.fluid.layers.nce ArgSpec(args=['input', 'label', 'num_total_classes', 'sample_weight', 'param_attr', 'bias_attr', 'num_neg_samples', 'name'], varargs=None, keywords=None, defaults=(None, None, None, None, None))
+paddle.fluid.layers.nce ArgSpec(args=['input', 'label', 'num_total_classes', 'sample_weight', 'param_attr', 'bias_attr', 'num_neg_samples', 'name', 'sampler', 'custom_dist', 'seed'], varargs=None, keywords=None, defaults=(None, None, None, None, None, 'uniform', None, 0))
 paddle.fluid.layers.hsigmoid ArgSpec(args=['input', 'label', 'num_classes', 'param_attr', 'bias_attr', 'name'], varargs=None, keywords=None, defaults=(None, None, None))
 paddle.fluid.layers.beam_search ArgSpec(args=['pre_ids', 'pre_scores', 'ids', 'scores', 'beam_size', 'end_id', 'level', 'name'], varargs=None, keywords=None, defaults=(0, None))
 paddle.fluid.layers.row_conv ArgSpec(args=['input', 'future_context_size', 'param_attr', 'act'], varargs=None, keywords=None, defaults=(None, None))
diff --git a/paddle/fluid/inference/analysis/passes/ir_analysis_compose_pass.cc b/paddle/fluid/inference/analysis/passes/ir_analysis_compose_pass.cc
index 233bfd6a42b7f123813d4ef5cecf353f7e88d208..38e9b1c5e7c19c89f94ce55324507b02da0c5160 100644
--- a/paddle/fluid/inference/analysis/passes/ir_analysis_compose_pass.cc
+++ b/paddle/fluid/inference/analysis/passes/ir_analysis_compose_pass.cc
@@ -45,7 +45,7 @@ void IrAnalysisComposePass::InitTensorRTAttrs(Argument *argument) {
       std::unordered_set<std::string> teller_set(
           {"mul", "conv2d", "pool2d", "relu", "softmax", "sigmoid",
            "depthwise_conv2d", "batch_norm", "concat", "tanh", "pad",
-           "elementwise_add", "dropout", "split"});
+           "elementwise_add", "dropout", "split", "prelu", "conv2d_transpose"});
       if (!node->IsOp()) return false;
 
       if (teller_set.count(node->Op()->Type())) {
diff --git a/paddle/fluid/inference/api/analysis_predictor.cc b/paddle/fluid/inference/api/analysis_predictor.cc
index 76d205b737aeb456f242037f2b375d9c537b39f3..d19505877bbc1110fcf5787fffc1436d242a7cdc 100644
--- a/paddle/fluid/inference/api/analysis_predictor.cc
+++ b/paddle/fluid/inference/api/analysis_predictor.cc
@@ -549,4 +549,6 @@ USE_TRT_CONVERTER(concat);
 USE_TRT_CONVERTER(dropout);
 USE_TRT_CONVERTER(pad);
 USE_TRT_CONVERTER(split);
+USE_TRT_CONVERTER(prelu);
+USE_TRT_CONVERTER(conv2d_transpose);
 #endif
diff --git a/paddle/fluid/inference/tensorrt/convert/CMakeLists.txt b/paddle/fluid/inference/tensorrt/convert/CMakeLists.txt
index ed4c398cee518af3211cab4e982082c46ebb36c2..aa4126392bf1f4b16a123403b68f506d6f76b5a2 100644
--- a/paddle/fluid/inference/tensorrt/convert/CMakeLists.txt
+++ b/paddle/fluid/inference/tensorrt/convert/CMakeLists.txt
@@ -2,7 +2,7 @@
 nv_library(tensorrt_converter
   SRCS mul_op.cc conv2d_op.cc fc_op.cc pool2d_op.cc elementwise_op.cc
 batch_norm_op.cc activation_op.cc softmax_op.cc concat_op.cc dropout_op.cc
-pad_op.cc split_op.cc
+pad_op.cc split_op.cc prelu_op.cc
   DEPS tensorrt_engine tensorrt_plugin operator scope framework_proto op_registry)
 
 nv_test(test_op_converter SRCS test_op_converter.cc DEPS
@@ -16,7 +16,7 @@ nv_test(test_trt_fc_op SRCS test_fc_op.cc fc_op.cc
 nv_test(test_trt_activation_op SRCS test_activation_op.cc activation_op.cc
         DEPS ${FLUID_CORE_MODULES} tensorrt_engine activation_op SERIAL)
 nv_test(test_trt_conv_op SRCS test_conv2d_op.cc conv2d_op.cc
-        DEPS ${FLUID_CORE_MODULES} tensorrt_engine conv_op SERIAL)
+        DEPS ${FLUID_CORE_MODULES} tensorrt_engine conv_op conv_transpose_op SERIAL)
 nv_test(test_trt_pool2d_op SRCS test_pool2d_op.cc pool2d_op.cc
         DEPS ${FLUID_CORE_MODULES} tensorrt_engine pool_op SERIAL)
 nv_test(test_trt_elementwise_op SRCS test_elementwise_op.cc elementwise_op.cc
@@ -33,4 +33,7 @@ nv_test(test_trt_pad_op SRCS test_pad_op.cc pad_op.cc
         DEPS ${FLUID_CORE_MODULES} tensorrt_engine pad_op SERIAL)
 nv_test(test_trt_split_op SRCS test_split_op.cc split_op.cc
         DEPS ${FLUID_CORE_MODULES} tensorrt_engine tensorrt_plugin
-split_op concat_op SERIAL)
+        split_op concat_op SERIAL)
+nv_test(test_trt_prelu_op SRCS test_prelu_op.cc prelu_op.cc
+        DEPS ${FLUID_CORE_MODULES} tensorrt_engine tensorrt_plugin
+        prelu_op SERIAL)
diff --git a/paddle/fluid/inference/tensorrt/convert/conv2d_op.cc b/paddle/fluid/inference/tensorrt/convert/conv2d_op.cc
index 43950b8c048b4e1b8974956948caa639812b2f78..7900f56c9ce17ffc7c62c85a42c62ba326dea16e 100644
--- a/paddle/fluid/inference/tensorrt/convert/conv2d_op.cc
+++ b/paddle/fluid/inference/tensorrt/convert/conv2d_op.cc
@@ -18,92 +18,139 @@ namespace paddle {
 namespace inference {
 namespace tensorrt {
 
-bool to_skip_merging_optimize(TensorRTEngine* engine_,
+bool to_skip_merging_optimize(TensorRTEngine* engine,
                               const std::vector<int>& filters,
                               const std::vector<int>& strides,
                               const std::vector<int>& paddings,
                               std::string input_name) {
-  if (engine_->itensor_quote_num[input_name] > 0) {
+  if (engine->itensor_quote_num[input_name] > 0) {
     return true;
   }
   if (filters[0] == 1 && filters[1] == 1 && strides[0] == 1 &&
       strides[1] == 1 && paddings[0] == 0 && paddings[1] == 0)
-    engine_->itensor_quote_num[input_name] += 1;
+    engine->itensor_quote_num[input_name] += 1;
 
   return false;
 }
 
+template <typename RegistFunc, typename SetDilationFunc>
+void ConvertConv2d(TensorRTEngine* engine, const framework::proto::OpDesc& op,
+                   const framework::Scope& scope, bool test_mode,
+                   RegistFunc fadd_layer, SetDilationFunc fset_dilation,
+                   const std::string& name) {
+  VLOG(3) << "convert a fluid " << name << " op to tensorrt layer without bias";
+
+  framework::OpDesc op_desc(op, nullptr);
+  PADDLE_ENFORCE_EQ(op_desc.Input("Input").size(), 1);
+  PADDLE_ENFORCE_EQ(op_desc.Input("Filter").size(), 1);  // Y is a weight
+  PADDLE_ENFORCE_EQ(op_desc.Output("Output").size(), 1);
+
+  PADDLE_ENFORCE(engine != nullptr);
+  auto* X = engine->GetITensor(op_desc.Input("Input").front());
+
+  // Declare weights
+  auto* Y_v = scope.FindVar(op_desc.Input("Filter").front());
+  PADDLE_ENFORCE_NOT_NULL(Y_v);
+  auto* Y_t = Y_v->GetMutable<framework::LoDTensor>();
+
+  platform::CPUPlace cpu_place;
+  std::unique_ptr<framework::LoDTensor> weight_tensor(
+      new framework::LoDTensor());
+  weight_tensor->Resize(Y_t->dims());
+  TensorCopySync((*Y_t), cpu_place, weight_tensor.get());
+
+  auto* weight_data = weight_tensor->mutable_data<float>(platform::CPUPlace());
+
+  PADDLE_ENFORCE_EQ(weight_tensor->dims().size(), 4UL);
+  const int n_output = weight_tensor->dims()[0];
+  const int n_input = weight_tensor->dims()[1];
+  const int filter_h = weight_tensor->dims()[2];
+  const int filter_w = weight_tensor->dims()[3];
+  const int groups = boost::get<int>(op_desc.GetAttr("groups"));
+  const std::vector<int> dilations =
+      boost::get<std::vector<int>>(op_desc.GetAttr("dilations"));
+  const std::vector<int> strides =
+      boost::get<std::vector<int>>(op_desc.GetAttr("strides"));
+  const std::vector<int> paddings =
+      boost::get<std::vector<int>>(op_desc.GetAttr("paddings"));
+
+  nvinfer1::DimsHW nv_ksize(filter_h, filter_w);
+  nvinfer1::DimsHW nv_dilations(dilations[0], dilations[1]);
+  nvinfer1::DimsHW nv_strides(strides[0], strides[1]);
+  nvinfer1::DimsHW nv_paddings(paddings[0], paddings[1]);
+
+  TensorRTEngine::Weight weight{nvinfer1::DataType::kFLOAT,
+                                static_cast<void*>(weight_data),
+                                static_cast<size_t>(weight_tensor->numel())};
+
+  TensorRTEngine::Weight bias{nvinfer1::DataType::kFLOAT, nullptr, 0};
+  auto* layer = fadd_layer(const_cast<nvinfer1::ITensor*>(X), n_output, n_input,
+                           nv_ksize, weight, bias);
+  PADDLE_ENFORCE(layer != nullptr);
+  layer->setStride(nv_strides);
+  layer->setPadding(nv_paddings);
+  layer->setNbGroups(groups);
+  // set dilations
+  fset_dilation(layer, nv_dilations);
+
+  auto output_name = op_desc.Output("Output").front();
+  layer->setName((name + " (Output: " + output_name + ")").c_str());
+  engine->weight_map[op_desc.Input("Filter").front()] =
+      std::move(weight_tensor);
+  layer->getOutput(0)->setName(output_name.c_str());
+  engine->SetITensor(output_name, layer->getOutput(0));
+
+  if (test_mode ||
+      to_skip_merging_optimize(engine, {filter_h, filter_w}, strides, paddings,
+                               op_desc.Input("Input").front())) {
+    engine->DeclareOutput(output_name);
+  }
+}
+
 class Conv2dOpConverter : public OpConverter {
  public:
   void operator()(const framework::proto::OpDesc& op,
                   const framework::Scope& scope, bool test_mode) override {
-    VLOG(3) << "convert a fluid conv2d op to tensorrt conv layer without bias";
-
-    framework::OpDesc op_desc(op, nullptr);
-    PADDLE_ENFORCE_EQ(op_desc.Input("Input").size(), 1);
-    PADDLE_ENFORCE_EQ(op_desc.Input("Filter").size(), 1);  // Y is a weight
-    PADDLE_ENFORCE_EQ(op_desc.Output("Output").size(), 1);
-
-    auto* X = engine_->GetITensor(op_desc.Input("Input").front());
-
-    // Declare weights
-    auto* Y_v = scope.FindVar(op_desc.Input("Filter").front());
-    PADDLE_ENFORCE_NOT_NULL(Y_v);
-    auto* Y_t = Y_v->GetMutable<framework::LoDTensor>();
-
-    platform::CPUPlace cpu_place;
-    std::unique_ptr<framework::LoDTensor> weight_tensor(
-        new framework::LoDTensor());
-    weight_tensor->Resize(Y_t->dims());
-    TensorCopySync((*Y_t), cpu_place, weight_tensor.get());
-
-    auto* weight_data =
-        weight_tensor->mutable_data<float>(platform::CPUPlace());
-
-    PADDLE_ENFORCE_EQ(weight_tensor->dims().size(), 4UL);
-    const int n_output = weight_tensor->dims()[0];
-    const int filter_h = weight_tensor->dims()[2];
-    const int filter_w = weight_tensor->dims()[3];
-
-    const int groups = boost::get<int>(op_desc.GetAttr("groups"));
-    const std::vector<int> dilations =
-        boost::get<std::vector<int>>(op_desc.GetAttr("dilations"));
-    const std::vector<int> strides =
-        boost::get<std::vector<int>>(op_desc.GetAttr("strides"));
-    const std::vector<int> paddings =
-        boost::get<std::vector<int>>(op_desc.GetAttr("paddings"));
-
-    nvinfer1::DimsHW nv_ksize(filter_h, filter_w);
-    nvinfer1::DimsHW nv_dilations(dilations[0], dilations[1]);
-    nvinfer1::DimsHW nv_strides(strides[0], strides[1]);
-    nvinfer1::DimsHW nv_paddings(paddings[0], paddings[1]);
-
-    TensorRTEngine::Weight weight{nvinfer1::DataType::kFLOAT,
-                                  static_cast<void*>(weight_data),
-                                  weight_tensor->memory_size() / sizeof(float)};
-
-    TensorRTEngine::Weight bias{nvinfer1::DataType::kFLOAT, nullptr, 0};
-    auto* layer = TRT_ENGINE_ADD_LAYER(
-        engine_, Convolution, *const_cast<nvinfer1::ITensor*>(X), n_output,
-        nv_ksize, weight.get(), bias.get());
-    PADDLE_ENFORCE(layer != nullptr);
-    layer->setStride(nv_strides);
-    layer->setPadding(nv_paddings);
-    layer->setDilation(nv_dilations);
-    layer->setNbGroups(groups);
-
-    auto output_name = op_desc.Output("Output").front();
-    layer->setName(("conv2d (Output: " + output_name + ")").c_str());
-    engine_->weight_map[op_desc.Input("Filter").front()] =
-        std::move(weight_tensor);
-    layer->getOutput(0)->setName(output_name.c_str());
-    engine_->SetITensor(output_name, layer->getOutput(0));
-
-    if (test_mode ||
-        to_skip_merging_optimize(engine_, {filter_h, filter_w}, strides,
-                                 paddings, op_desc.Input("Input").front())) {
-      engine_->DeclareOutput(output_name);
-    }
+    ConvertConv2d(
+        engine_, op, scope, test_mode,
+        [&](nvinfer1::ITensor* inputs, int n_output, /* Conv output maps */
+            int n_input,                             /* Conv input maps */
+            nvinfer1::DimsHW& ksize, TensorRTEngine::Weight& weight,
+            TensorRTEngine::Weight& bias) -> nvinfer1::IConvolutionLayer* {
+          auto* layer =
+              TRT_ENGINE_ADD_LAYER(engine_, Convolution, *inputs, n_output,
+                                   ksize, weight.get(), bias.get());
+          return layer;
+        },
+        [](nvinfer1::IConvolutionLayer* layer, nvinfer1::DimsHW& dilations) {
+          layer->setDilation(dilations);
+        },
+        "conv2d");
+  }
+};
+
+class Deconv2dOpConverter : public OpConverter {
+ public:
+  void operator()(const framework::proto::OpDesc& op,
+                  const framework::Scope& scope, bool test_mode) override {
+    ConvertConv2d(
+        engine_, op, scope, test_mode,
+        [&](nvinfer1::ITensor* inputs, int n_output, /* Deconv input maps */
+            int n_input,                             /* Deconv output maps */
+            nvinfer1::DimsHW& ksize, TensorRTEngine::Weight& weight,
+            TensorRTEngine::Weight& bias) -> nvinfer1::IDeconvolutionLayer* {
+          auto* layer =
+              TRT_ENGINE_ADD_LAYER(engine_, Deconvolution, *inputs, n_input,
+                                   ksize, weight.get(), bias.get());
+          return layer;
+        },
+        [](nvinfer1::IDeconvolutionLayer* layer, nvinfer1::DimsHW& dilations) {
+          PADDLE_ENFORCE(
+              dilations.d[0] == 1 && dilations.d[1] == 1,
+              "Dilations must be (1, 1) for tensorRT, but given (%d, %d)",
+              dilations.d[0], dilations.d[1]);
+        },
+        "conv2d_transpose");
   }
 };
 
@@ -112,3 +159,4 @@ class Conv2dOpConverter : public OpConverter {
 }  // namespace paddle
 
 REGISTER_TRT_OP_CONVERTER(conv2d, Conv2dOpConverter);
+REGISTER_TRT_OP_CONVERTER(conv2d_transpose, Deconv2dOpConverter);
diff --git a/paddle/fluid/inference/tensorrt/convert/elementwise_op.cc b/paddle/fluid/inference/tensorrt/convert/elementwise_op.cc
index 671bcd8aa9a9fff34644a056499961cf6ab81287..1af091fabd2aea03a85b2d19fd556b18cdd65e3b 100644
--- a/paddle/fluid/inference/tensorrt/convert/elementwise_op.cc
+++ b/paddle/fluid/inference/tensorrt/convert/elementwise_op.cc
@@ -34,7 +34,8 @@ class ElementwiseWeightOpConverter : public OpConverter {
 
     auto* X = engine_->GetITensor(op_desc.Input("X").front());
     nvinfer1::Dims dims_x = X->getDimensions();
-    PADDLE_ENFORCE(dims_x.nbDims >= 3);
+    PADDLE_ENFORCE(dims_x.nbDims >= 3, "x dims experts 3, but %d is given.",
+                   dims_x.nbDims);
 
     auto* Y_v = scope.FindVar(op_desc.Input("Y").front());
     PADDLE_ENFORCE_NOT_NULL(Y_v);
diff --git a/paddle/fluid/inference/tensorrt/convert/prelu_op.cc b/paddle/fluid/inference/tensorrt/convert/prelu_op.cc
new file mode 100644
index 0000000000000000000000000000000000000000..337885e6baa578d1f733e40f09f0586eba393333
--- /dev/null
+++ b/paddle/fluid/inference/tensorrt/convert/prelu_op.cc
@@ -0,0 +1,80 @@
+/* Copyright (c) 2018 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/inference/tensorrt/convert/op_converter.h"
+#include "paddle/fluid/inference/tensorrt/plugin/prelu_op_plugin.h"
+
+namespace paddle {
+namespace inference {
+namespace tensorrt {
+
+/*
+ * PRelu converter from fluid to tensorRT.
+ */
+class PReluOpConverter : public OpConverter {
+ public:
+  void operator()(const framework::proto::OpDesc& op,
+                  const framework::Scope& scope, bool test_mode) override {
+    VLOG(4) << "convert fluid prelu op to tensorrt prelu layer";
+
+    framework::OpDesc op_desc(op, nullptr);
+    // Declare inputs
+    int input_num = op_desc.Input("X").size();
+    PADDLE_ENFORCE(input_num == 1);
+    auto* input = engine_->GetITensor(op_desc.Input("X")[0]);
+    // Get output
+    size_t output_num = op_desc.Output("Out").size();
+    PADDLE_ENFORCE(output_num == 1);
+    // Get attrs
+    std::string mode = boost::get<std::string>(op_desc.GetAttr("mode"));
+    //
+    auto* alpha_var = scope.FindVar(op_desc.Input("Alpha")[0]);
+    PADDLE_ENFORCE_NOT_NULL(alpha_var);
+    auto* alpha_tensor = alpha_var->GetMutable<framework::LoDTensor>();
+
+    platform::CUDAPlace place;
+    std::unique_ptr<framework::LoDTensor> alpha_tensor_device(
+        new framework::LoDTensor());
+    alpha_tensor_device->Resize(alpha_tensor->dims());
+    TensorCopySync(*alpha_tensor, place, alpha_tensor_device.get());
+    float* alpha_data = alpha_tensor_device->mutable_data<float>(place);
+
+    // Transform alpha to TensorRTEngine::Weight
+    TensorRTEngine::Weight alpha_rt(nvinfer1::DataType::kFLOAT,
+                                    static_cast<void*>(alpha_data),
+                                    alpha_tensor_device->numel());
+    PReluPlugin* plugin = new PReluPlugin(alpha_rt, mode);
+    nvinfer1::IPluginLayer* layer =
+        engine_->AddPlugin(&input, input_num, plugin);
+    // keep alpha tensor to avoid release it's memory
+    engine_->weight_map[op_desc.Input("Alpha")[0]] =
+        std::move(alpha_tensor_device);
+
+    std::string layer_name = "prelu (Output: ";
+    auto output_name = op_desc.Output("Out")[0];
+    layer->getOutput(0)->setName(output_name.c_str());
+    engine_->SetITensor(output_name, layer->getOutput(0));
+    layer_name += output_name;
+    if (test_mode) {
+      engine_->DeclareOutput(output_name);
+    }
+    layer->setName((layer_name + ")").c_str());
+  }
+};
+
+}  // namespace tensorrt
+}  // namespace inference
+}  // namespace paddle
+
+REGISTER_TRT_OP_CONVERTER(prelu, PReluOpConverter);
diff --git a/paddle/fluid/inference/tensorrt/convert/split_op.cc b/paddle/fluid/inference/tensorrt/convert/split_op.cc
index 12179cccc76f8b0f595f41c135290dc0f3b50ad7..159854ab593fbbfa1e08a9ca148f1b3a636d668c 100644
--- a/paddle/fluid/inference/tensorrt/convert/split_op.cc
+++ b/paddle/fluid/inference/tensorrt/convert/split_op.cc
@@ -26,7 +26,7 @@ class SplitOpConverter : public OpConverter {
  public:
   void operator()(const framework::proto::OpDesc& op,
                   const framework::Scope& scope, bool test_mode) override {
-    VLOG(40) << "convert a fluid split op to tensorrt split layer";
+    VLOG(4) << "convert a fluid split op to tensorrt split layer";
 
     framework::OpDesc op_desc(op, nullptr);
     // Declare inputs
diff --git a/paddle/fluid/inference/tensorrt/convert/test_conv2d_op.cc b/paddle/fluid/inference/tensorrt/convert/test_conv2d_op.cc
index f8711c6b60d74639529624c25429bc245de46479..95916746d6fcb528d26a8f8bb39980b55c4f3704 100644
--- a/paddle/fluid/inference/tensorrt/convert/test_conv2d_op.cc
+++ b/paddle/fluid/inference/tensorrt/convert/test_conv2d_op.cc
@@ -16,6 +16,9 @@ limitations under the License. */
 #include "paddle/fluid/inference/tensorrt/convert/op_converter.h"
 #include "paddle/fluid/inference/tensorrt/convert/ut_helper.h"
 
+USE_OP(conv2d);
+USE_OP(conv2d_transpose);
+
 namespace paddle {
 namespace inference {
 namespace tensorrt {
@@ -51,7 +54,37 @@ TEST(conv2d_op, test) {
   validator.Execute(3);
 }
 
+TEST(conv2d_transpose_op, test) {
+  std::unordered_set<std::string> parameters({"deconv2d-Y"});
+  framework::Scope scope;
+  TRTConvertValidation validator(5, parameters, scope, 1 << 15);
+
+  validator.DeclInputVar("deconv2d-X", nvinfer1::Dims3(3, 5, 5));
+  validator.DeclParamVar("deconv2d-Y", nvinfer1::Dims4(3, 2, 3, 3));
+  validator.DeclOutputVar("deconv2d-Out", nvinfer1::Dims3(2, 5, 5));
+
+  // Prepare Op description
+  framework::OpDesc desc;
+  desc.SetType("conv2d_transpose");
+  desc.SetInput("Input", {"deconv2d-X"});
+  desc.SetInput("Filter", {"deconv2d-Y"});
+  desc.SetOutput("Output", {"deconv2d-Out"});
+
+  const std::vector<int> strides({1, 1});
+  const std::vector<int> paddings({1, 1});
+  const std::vector<int> dilations({1, 1});
+  const int groups = 1;
+
+  desc.SetAttr("strides", strides);
+  desc.SetAttr("paddings", paddings);
+  desc.SetAttr("dilations", dilations);
+  desc.SetAttr("groups", groups);
+
+  validator.SetOp(*desc.Proto());
+
+  validator.Execute(3);
+}
+
 }  // namespace tensorrt
 }  // namespace inference
 }  // namespace paddle
-USE_OP(conv2d);
diff --git a/paddle/fluid/inference/tensorrt/convert/test_prelu_op.cc b/paddle/fluid/inference/tensorrt/convert/test_prelu_op.cc
new file mode 100644
index 0000000000000000000000000000000000000000..453f222f1f1e3f3b9ee8fa7bd49f4cab2286e7ea
--- /dev/null
+++ b/paddle/fluid/inference/tensorrt/convert/test_prelu_op.cc
@@ -0,0 +1,94 @@
+/* Copyright (c) 2018 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 <gtest/gtest.h>
+#include "paddle/fluid/inference/tensorrt/convert/op_converter.h"
+#include "paddle/fluid/inference/tensorrt/convert/ut_helper.h"
+
+namespace paddle {
+namespace inference {
+namespace tensorrt {
+
+TEST(prelu_op, test_channel_wise) {
+  std::unordered_set<std::string> parameters({"prelu_alpha"});
+  framework::Scope scope;
+  TRTConvertValidation validator(10, parameters, scope, 1000);
+  validator.DeclInputVar("prelu_input", nvinfer1::DimsCHW(3, 2, 2));
+  validator.DeclParamVar("prelu_alpha", nvinfer1::Dims3(3, 1, 1));
+  validator.DeclOutputVar("prelu_out", nvinfer1::DimsCHW(3, 2, 2));
+
+  // Prepare Op description
+  framework::OpDesc desc;
+  desc.SetType("prelu");
+  desc.SetInput("X", {"prelu_input"});
+  desc.SetInput("Alpha", {"prelu_alpha"});
+  desc.SetOutput("Out", {"prelu_out"});
+
+  desc.SetAttr("mode", std::string("channel"));
+
+  validator.SetOp(*desc.Proto());
+
+  validator.Execute(1);
+}
+
+TEST(prelu_op, test_element_wise) {
+  std::unordered_set<std::string> parameters({"prelu_alpha"});
+  framework::Scope scope;
+  TRTConvertValidation validator(10, parameters, scope, 1000);
+  validator.DeclInputVar("prelu_input", nvinfer1::DimsCHW(3, 2, 2));
+  validator.DeclParamVar("prelu_alpha", nvinfer1::Dims4(10, 3, 2, 2));
+  validator.DeclOutputVar("prelu_out", nvinfer1::DimsCHW(3, 2, 2));
+
+  // Prepare Op description
+  framework::OpDesc desc;
+  desc.SetType("prelu");
+  desc.SetInput("X", {"prelu_input"});
+  desc.SetInput("Alpha", {"prelu_alpha"});
+  desc.SetOutput("Out", {"prelu_out"});
+
+  desc.SetAttr("mode", std::string("element"));
+
+  validator.SetOp(*desc.Proto());
+
+  validator.Execute(1);
+}
+
+TEST(prelu_op, test_scalar) {
+  std::unordered_set<std::string> parameters({"prelu_alpha"});
+  framework::Scope scope;
+  TRTConvertValidation validator(10, parameters, scope, 1000);
+  validator.DeclInputVar("prelu_input", nvinfer1::DimsCHW(3, 2, 2));
+  validator.DeclParamVar("prelu_alpha", nvinfer1::Dims3(1, 1, 1));
+  validator.DeclOutputVar("prelu_out", nvinfer1::DimsCHW(3, 2, 2));
+
+  // Prepare Op description
+  framework::OpDesc desc;
+  desc.SetType("prelu");
+  desc.SetInput("X", {"prelu_input"});
+  desc.SetInput("Alpha", {"prelu_alpha"});
+  desc.SetOutput("Out", {"prelu_out"});
+
+  desc.SetAttr("mode", std::string("all"));
+
+  validator.SetOp(*desc.Proto());
+
+  validator.Execute(1);
+}
+
+}  // namespace tensorrt
+}  // namespace inference
+}  // namespace paddle
+
+// USE_OP(prelu);
+USE_CPU_ONLY_OP(prelu);
diff --git a/paddle/fluid/inference/tensorrt/engine.cc b/paddle/fluid/inference/tensorrt/engine.cc
index fdd8b56b0ce5c9b5cb6395bcb437aae5ae27829b..208bd12b83aa19f01de9bcf4ada630c87defad5d 100644
--- a/paddle/fluid/inference/tensorrt/engine.cc
+++ b/paddle/fluid/inference/tensorrt/engine.cc
@@ -200,7 +200,8 @@ void TensorRTEngine::GetOutputInCPU(const std::string &name, void *dst,
 Buffer &TensorRTEngine::buffer(const std::string &name) {
   PADDLE_ENFORCE(infer_engine_ != nullptr, "call FreezeNetwork first.");
   auto it = buffer_sizes_.find(name);
-  PADDLE_ENFORCE(it != buffer_sizes_.end());
+  PADDLE_ENFORCE(it != buffer_sizes_.end(), "tried to access buffer named %s",
+                 name);
   auto slot_offset = infer_engine_->getBindingIndex(name.c_str());
   return buffers_[slot_offset];
 }
diff --git a/paddle/fluid/inference/tensorrt/engine.h b/paddle/fluid/inference/tensorrt/engine.h
index 335acdf653e55cc7f3ceccdba88992851c8e0310..99420f19ba17d0bebf6dde3800d57c912256dc6b 100644
--- a/paddle/fluid/inference/tensorrt/engine.h
+++ b/paddle/fluid/inference/tensorrt/engine.h
@@ -40,6 +40,7 @@ class TensorRTEngine : public EngineBase {
   // Weight is model parameter.
   class Weight {
    public:
+    Weight() = default;
     Weight(nvinfer1::DataType dtype, void* value, size_t num_elem) {
       w_.type = dtype;
       w_.values = value;
diff --git a/paddle/fluid/inference/tensorrt/plugin/CMakeLists.txt b/paddle/fluid/inference/tensorrt/plugin/CMakeLists.txt
index 71b7a551619a43e5300ad3205418d1174c7019ff..6611e2e4b35ee51e58cb6b7b088ad160acb659ad 100644
--- a/paddle/fluid/inference/tensorrt/plugin/CMakeLists.txt
+++ b/paddle/fluid/inference/tensorrt/plugin/CMakeLists.txt
@@ -1 +1 @@
-nv_library(tensorrt_plugin SRCS trt_plugin.cc split_op_plugin.cu DEPS enforce)
+nv_library(tensorrt_plugin SRCS trt_plugin.cc split_op_plugin.cu prelu_op_plugin.cu DEPS enforce)
diff --git a/paddle/fluid/inference/tensorrt/plugin/prelu_op_plugin.cu b/paddle/fluid/inference/tensorrt/plugin/prelu_op_plugin.cu
new file mode 100644
index 0000000000000000000000000000000000000000..0f1ca112955afeecbf82b26324b77aa8def2ad9f
--- /dev/null
+++ b/paddle/fluid/inference/tensorrt/plugin/prelu_op_plugin.cu
@@ -0,0 +1,131 @@
+// Copyright (c) 2018 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 <stdio.h>
+#include <cassert>
+#include "glog/logging.h"
+#include "paddle/fluid/inference/tensorrt/plugin/prelu_op_plugin.h"
+
+namespace paddle {
+namespace inference {
+namespace tensorrt {
+
+static const int CUDA_NUM_THREADS = 1024;
+static const int CUDA_MAX_NUM_BLOCKS = 65535;
+inline static int GET_NUM_BLOCKS(const int N) {
+  return (N + CUDA_NUM_THREADS - 1) / CUDA_NUM_THREADS;
+}
+
+__global__ void PReluChannelWiseKernel(const float *input, const float *alpha,
+                                       float *output, int channel,
+                                       size_t spatial_size) {
+  size_t offset = blockIdx.x * spatial_size;
+  const float *in = input + offset;
+  float *out = output + offset;
+  float scale = alpha[blockIdx.x % channel];
+
+  for (size_t i = threadIdx.x; i < spatial_size; i += blockDim.x) {
+    float x = in[i];
+    out[i] = (x > 0) ? x : scale * x;
+  }
+}
+
+__global__ void PReluElementWiseKernel(const float *input, const float *alpha,
+                                       float *output, size_t spatial_size) {
+  size_t offset = blockIdx.x * spatial_size;
+  const float *in = input + offset;
+  const float *scale = alpha + offset;
+  float *out = output + offset;
+
+  for (size_t i = threadIdx.x; i < spatial_size; i += blockDim.x) {
+    float x = in[i];
+    out[i] = (x > 0) ? x : scale[i] * x;
+  }
+}
+
+__global__ void PReluScalarKernel(const float *input, const float *alpha,
+                                  float *output, size_t spatial_size) {
+  size_t offset = blockIdx.x * spatial_size;
+  const float *in = input + offset;
+  float scale = *alpha;
+  float *out = output + offset;
+
+  for (size_t i = threadIdx.x; i < spatial_size; i += blockDim.x) {
+    float x = in[i];
+    out[i] = (x > 0) ? x : scale * x;
+  }
+}
+
+static inline void PReluChannelWise(cudaStream_t stream, const float *input,
+                                    const float *alpha, float *output,
+                                    int batch_size,
+                                    const nvinfer1::Dims &dims) {
+  size_t unroll = batch_size * dims.d[0];
+  size_t spatial_size = dims.d[1] * dims.d[2];
+  CHECK_LT(unroll, CUDA_MAX_NUM_BLOCKS);
+  PReluChannelWiseKernel<<<unroll, CUDA_NUM_THREADS, 0, stream>>>(
+      input, alpha, output, dims.d[0], spatial_size);
+}
+
+static inline void PReluElementWise(cudaStream_t stream, const float *input,
+                                    const float *alpha, float *output,
+                                    int batch_size,
+                                    const nvinfer1::Dims &dims) {
+  size_t unroll = batch_size * dims.d[0];
+  size_t spatial_size = dims.d[1] * dims.d[2];
+  CHECK_LT(unroll, CUDA_MAX_NUM_BLOCKS);
+  PReluElementWiseKernel<<<unroll, CUDA_NUM_THREADS, 0, stream>>>(
+      input, alpha, output, spatial_size);
+}
+
+static inline void PReluScalar(cudaStream_t stream, const float *input,
+                               const float *alpha, float *output,
+                               int batch_size, const nvinfer1::Dims &dims) {
+  size_t unroll = batch_size * dims.d[0];
+  size_t spatial_size = dims.d[1] * dims.d[2];
+  CHECK_LT(unroll, CUDA_MAX_NUM_BLOCKS);
+  PReluScalarKernel<<<unroll, CUDA_NUM_THREADS, 0, stream>>>(
+      input, alpha, output, spatial_size);
+}
+
+nvinfer1::Dims PReluPlugin::getOutputDimensions(int index,
+                                                const nvinfer1::Dims *inputDims,
+                                                int nbInputs) {
+  assert(nbInputs == 1);
+  assert(index < this->getNbOutputs());
+  nvinfer1::Dims const &input_dims = inputDims[0];
+  nvinfer1::Dims output_dims = input_dims;
+  return output_dims;
+}
+
+int PReluPlugin::enqueue(int batchSize, const void *const *inputs,
+                         void **outputs, void *workspace, cudaStream_t stream) {
+  // input dims is CHW.
+  const auto &input_dims = this->getInputDims(0);
+  const float *input = reinterpret_cast<const float *>(inputs[0]);
+  const float *alpha = reinterpret_cast<const float *>(alpha_.get().values);
+  float *output = reinterpret_cast<float **>(outputs)[0];
+  if (mode_ == "channel") {
+    PReluChannelWise(stream, input, alpha, output, batchSize, input_dims);
+  } else if (mode_ == "element") {
+    PReluElementWise(stream, input, alpha, output, batchSize, input_dims);
+  } else {
+    PReluScalar(stream, input, alpha, output, batchSize, input_dims);
+  }
+  return cudaGetLastError() != cudaSuccess;
+}
+
+}  // namespace tensorrt
+}  // namespace inference
+}  // namespace paddle
diff --git a/paddle/fluid/inference/tensorrt/plugin/prelu_op_plugin.h b/paddle/fluid/inference/tensorrt/plugin/prelu_op_plugin.h
new file mode 100644
index 0000000000000000000000000000000000000000..aa0f865c89be2dc20d3a30314ec02fd0b425b2fe
--- /dev/null
+++ b/paddle/fluid/inference/tensorrt/plugin/prelu_op_plugin.h
@@ -0,0 +1,68 @@
+// Copyright (c) 2018 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.
+
+#pragma once
+
+#include <string>
+#include "paddle/fluid/inference/tensorrt/engine.h"
+#include "paddle/fluid/inference/tensorrt/plugin/trt_plugin.h"
+
+namespace paddle {
+namespace inference {
+namespace tensorrt {
+
+class PReluPlugin : public PluginTensorRT {
+  TensorRTEngine::Weight alpha_;
+  std::string mode_;
+
+ protected:
+  size_t getSerializationSize() override {
+    // return getBaseSerializationSize(alpha_) + SerializedSize(mode_);
+    return 0;
+  }
+
+  // TRT will call this func when we need to serialize the configuration of
+  // tensorrt.
+  // It should not be called by users.
+  void serialize(void *buffer) override {
+    // serializeBase(buffer);
+    // SerializeValue(&buffer, alpha_);
+    // SerializeValue(&buffer, mode_);
+  }
+
+ public:
+  PReluPlugin(TensorRTEngine::Weight const &alpha, std::string const &mode)
+      : alpha_(alpha), mode_(mode) {}
+
+  // It was used for tensorrt deserialization.
+  // It should not be called by users.
+  PReluPlugin(void const *serialData, size_t serialLength) {
+    // deserializeBase(serialData, serialLength);
+    // DeserializeValue(&serialData, &serialLength, &alpha_);
+    // DeserializeValue(&serialData, &serialLength, &mode_);
+  }
+
+  PReluPlugin *clone() const override { return new PReluPlugin(alpha_, mode_); }
+
+  const char *getPluginType() const override { return "prelu"; }
+  int getNbOutputs() const override { return 1; }
+  nvinfer1::Dims getOutputDimensions(int index, const nvinfer1::Dims *inputs,
+                                     int nbInputDims) override;
+  int enqueue(int batchSize, const void *const *inputs, void **outputs,
+              void *workspace, cudaStream_t stream) override;
+};
+
+}  // namespace tensorrt
+}  // namespace inference
+}  // namespace paddle
diff --git a/paddle/fluid/operators/CMakeLists.txt b/paddle/fluid/operators/CMakeLists.txt
index edd062e1752a4bad9a2a9a2a25556e2293dcaac7..a9853d00ab1b73d232751d38e029627314902fe5 100644
--- a/paddle/fluid/operators/CMakeLists.txt
+++ b/paddle/fluid/operators/CMakeLists.txt
@@ -300,7 +300,6 @@ if (NOT WIN32)
     op_library(gru_op DEPS sequence2batch gru_compute)
 endif(NOT WIN32)
 op_library(recurrent_op DEPS executor)
-op_library(warpctc_op DEPS dynload_warpctc sequence_padding sequence_scale)
 op_library(cos_sim_op DEPS cos_sim_functor)
 op_library(parallel_do_op DEPS executor)
 op_library(unsqueeze_op DEPS reshape_op)
@@ -309,6 +308,7 @@ op_library(flatten_op DEPS reshape_op)
 op_library(sequence_pad_op DEPS sequence_padding)
 op_library(unstack_op DEPS stack_op)
 op_library(fake_quantize_op DEPS memory)
+op_library(nce_op DEPS sampler)
 if (NOT WIN32)
 op_library(crf_decoding_op DEPS jit_kernel)
 op_library(fusion_lstm_op DEPS jit_kernel)
@@ -331,6 +331,14 @@ op_library(load_combine_op DEPS lod_tensor)
 op_library(concat_op DEPS concat_and_split)
 op_library(tensor_array_to_tensor_op DEPS concat_op)
 
+set(DEPS_OPS ${DEPS_OPS} warpctc_op)
+if (WITH_GPU)
+    if (${CUDNN_MAJOR_VERSION} VERSION_LESS 7)
+        op_library(warpctc_op DEPS dynload_warpctc sequence_padding sequence_scale SRCS warpctc_op.cc warpctc_op.cu.cc)
+    endif()
+endif()
+op_library(warpctc_op DEPS dynload_warpctc sequence_padding sequence_scale)
+
 list(REMOVE_ITEM GENERAL_OPS ${DEPS_OPS})
 
 foreach(src ${GENERAL_OPS})
diff --git a/paddle/fluid/operators/expand_op.cc b/paddle/fluid/operators/expand_op.cc
index 5ad0ec251328cc1ba580026bb47bf05316e7dc77..40f7c1c54c861abebc84428f55e2769ac8969f0f 100644
--- a/paddle/fluid/operators/expand_op.cc
+++ b/paddle/fluid/operators/expand_op.cc
@@ -47,6 +47,11 @@ class ExpandOp : public framework::OperatorWithKernel {
       out_shape[i] = x_dims[i] * expand_times[i];
     }
 
+    // set the first dim to -1 in compile time
+    if (!ctx->IsRuntime()) {
+      out_shape[0] = x_dims[0];
+    }
+
     ctx->SetOutputDim("Out", framework::make_ddim(out_shape));
     if (out_shape[0] == x_dims[0]) {
       ctx->ShareLoD("X", "Out");
@@ -109,7 +114,16 @@ class ExpandGradOp : public framework::OperatorWithKernel {
         ctx->Attrs().Get<std::vector<int>>("expand_times");
     auto out_dims = ctx->GetInputDim(framework::GradVarName("Out"));
 
-    for (size_t i = 0; i < expand_times.size(); ++i) {
+    size_t start_pos = 0u;
+    if (!ctx->IsRuntime()) {
+      PADDLE_ENFORCE_EQ(
+          x_dims[0], out_dims[0],
+          "The first dimension size of Input(Out@GRAD) should be "
+          "equal to the crroresponding dimension size of Input(X)");
+      start_pos = 1u;
+    }
+
+    for (size_t i = start_pos; i < expand_times.size(); ++i) {
       PADDLE_ENFORCE_EQ(x_dims[i] * expand_times[i], out_dims[i],
                         "Each dimension size of Input(Out@GRAD) should be "
                         "equal to multiplication of crroresponding dimension "
diff --git a/paddle/fluid/operators/math/CMakeLists.txt b/paddle/fluid/operators/math/CMakeLists.txt
index cc3cc9787a3926eea2f9a1620eead9823a7d77c5..4cd014cbadb888a2afe118785336e673e2b5eafb 100644
--- a/paddle/fluid/operators/math/CMakeLists.txt
+++ b/paddle/fluid/operators/math/CMakeLists.txt
@@ -41,6 +41,7 @@ math_library(cross_entropy)
 math_library(cos_sim_functor)
 math_library(depthwise_conv)
 math_library(im2col)
+math_library(sampler)
 
 if (NOT WIN32) # windows do not support avx functions yet.
     math_library(gru_compute DEPS activation_functions math_function)
diff --git a/paddle/fluid/operators/math/sampler.cc b/paddle/fluid/operators/math/sampler.cc
index 3066dc0ba284611af89c4927f45089a570ab88bc..690d6f6baafb33d50c8f2d3606d903634d622d16 100644
--- a/paddle/fluid/operators/math/sampler.cc
+++ b/paddle/fluid/operators/math/sampler.cc
@@ -1,4 +1,4 @@
-/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
+/* Copyright (c) 2018 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.
@@ -13,52 +13,46 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #include "paddle/fluid/operators/math/sampler.h"
+#include <iostream>
+#include <queue>
+#include <utility>
+#include <vector>
 
 namespace paddle {
-namespace random {
+namespace operators {
+namespace math {
 
 Sampler::~Sampler() {}
 
-UniformSampler::UniformSampler(int64 range)
-    : Sampler(range), inv_range_(1.0 / range) {
-  random_engine_ = std::make_shared<std::mt19937>(seed_);
+UniformSampler::UniformSampler(int64_t range, unsigned int seed)
+    : Sampler(range, seed), inv_range_(1.0 / (range + 1)) {
+  random_engine_ = std::make_shared<std::mt19937_64>(seed_);
   dist_ = std::make_shared<std::uniform_int_distribution<>>(0, range);
 }
 
-UniformSampler::UniformSampler(int64 range, unsigned int seed)
-    : Sampler(range, seed), inv_range_(1.0 / range) {
-  random_engine_ = std::make_shared<std::mt19937>(seed_);
-  dist_ = std::make_shared<std::uniform_int_distribution<>>(0, range);
-}
-
-int64 UniformSampler::Sample() const { return (*dist_)(*random_engine_); }
+int64_t UniformSampler::Sample() const { return (*dist_)(*random_engine_); }
 
-float UniformSampler::Probability(int64 value) const { return inv_range_; }
+float UniformSampler::Probability(int64_t value) const { return inv_range_; }
 
-LogUniformSampler::LogUniformSampler(int64 range)
-    : Sampler(range), log_range_(log(range + 1)) {
-  random_engine_ = std::make_shared<std::mt19937>(seed_);
-  dist_ = std::make_shared<std::uniform_real_distribution<>>(0, 1);
-}
-
-LogUniformSampler::LogUniformSampler(int64 range, unsigned int seed)
+LogUniformSampler::LogUniformSampler(int64_t range, unsigned int seed)
     : Sampler(range, seed), log_range_(log(range + 1)) {
-  random_engine_ = std::make_shared<std::mt19937>(seed_);
+  random_engine_ = std::make_shared<std::mt19937_64>(seed_);
   dist_ = std::make_shared<std::uniform_real_distribution<>>(0, 1);
 }
-int64 LogUniformSampler::Sample() const {
+
+int64_t LogUniformSampler::Sample() const {
   // Got Log Uniform distribution from uniform distribution by
   // inverse_transform_sampling method
   // More details:
   // https://wanghaoshuang.github.io/2017/11/Log-uniform-distribution-sampler/
-  const int64 value =
-      static_cast<int64>(exp((*dist_)(*random_engine_) * log_range_)) - 1;
+  const int64_t value =
+      static_cast<int64_t>(exp((*dist_)(*random_engine_) * log_range_)) - 1;
   // Mathematically, value should be <= range_, but might not be due to some
   // floating point roundoff, so we mod by range_.
   return value % range_;
 }
 
-float LogUniformSampler::Probability(int64 value) const {
+float LogUniformSampler::Probability(int64_t value) const {
   // Given f(x) = 1/[(x+1) * log_range_]
   // The value's  probability  is integral of f(x) from value to (value + 1)
   // More details:
@@ -66,5 +60,76 @@ float LogUniformSampler::Probability(int64 value) const {
   return (log((value + 2.0) / (value + 1.0))) / log_range_;
 }
 
-}  // namespace random
+CustomSampler::CustomSampler(int64_t range, const float* probabilities,
+                             unsigned int seed)
+    : Sampler(range, seed) {
+  random_engine_ = std::make_shared<std::mt19937_64>(seed_);
+  real_dist_ = std::make_shared<std::uniform_real_distribution<>>(0, 1);
+  int_dist_ = std::make_shared<std::uniform_int_distribution<>>(0, range);
+  alias_probs_ = std::make_shared<std::vector<float>>(range + 1);
+  alias_ = std::make_shared<std::vector<int64_t>>(range + 1);
+  probs_ = std::make_shared<std::vector<float>>(range + 1);
+
+  std::queue<std::pair<int64_t, float>> bigs;
+  std::queue<std::pair<int64_t, float>> littles;
+  for (int64_t i = 0; i <= range; ++i) {
+    (*probs_)[i] = probabilities[i];
+    float normal_prob = probabilities[i] * (range + 1);
+    if (normal_prob - 1.0 > 1e-4) {
+      bigs.emplace(i, normal_prob);
+    } else if (1.0 - normal_prob > 1e-4) {
+      littles.emplace(i, normal_prob);
+    } else {
+      (*alias_probs_)[i] = normal_prob;
+      (*alias_)[i] = -1;
+    }
+  }
+
+  while ((!littles.empty()) && (!bigs.empty())) {
+    auto big = bigs.front();
+    auto little = littles.front();
+    bigs.pop();
+    littles.pop();
+    (*alias_probs_)[little.first] = little.second;
+    (*alias_)[little.first] = big.first;
+    auto big_left = big.second - (1 - little.second);
+    if (big_left - 1.0 > 1e-4) {
+      bigs.emplace(big.first, big_left);
+    } else if (1.0 - big_left > 1e-4) {
+      littles.emplace(big.first, big_left);
+    } else {
+      (*alias_probs_)[big.first] = big_left;
+      (*alias_)[big.first] = -1;
+    }
+  }
+
+  if (!littles.empty()) {  // littles.second is close to 1.0
+    auto little = littles.front();
+    (*alias_probs_)[little.first] = 1.0;
+    (*alias_)[little.first] = -1;
+  }
+
+  if (!bigs.empty()) {  // bigs.second is close to 1.0
+    auto big = bigs.front();
+    (*alias_probs_)[big.first] = 1.0;
+    (*alias_)[big.first] = -1;
+  }
+}
+
+int64_t CustomSampler::Sample() const {
+  auto index = (*int_dist_)(*random_engine_);
+  auto p = (*real_dist_)(*random_engine_);
+  if (p > (*alias_probs_)[index]) {
+    return (*alias_)[index];
+  } else {
+    return index;
+  }
+}
+
+float CustomSampler::Probability(int64_t value) const {
+  return (*probs_)[value];
+}
+
+}  // namespace math
+}  // namespace operators
 }  // namespace paddle
diff --git a/paddle/fluid/operators/math/sampler.h b/paddle/fluid/operators/math/sampler.h
index b82691f269c5d0f267ca98c78646efe9b26f0b34..836cdad51f17e93f811ba14695bbe1a65156c588 100644
--- a/paddle/fluid/operators/math/sampler.h
+++ b/paddle/fluid/operators/math/sampler.h
@@ -16,6 +16,8 @@ limitations under the License. */
 #include <cstdint>
 #include <memory>
 #include <random>
+#include <vector>
+
 namespace paddle {
 namespace operators {
 namespace math {
@@ -27,14 +29,14 @@ namespace math {
 */
 class Sampler {
  public:
-  explicit Sampler(int64_t range) : range_(range) {
-    PADDLE_ENFORCE_GT(range, 0);
-    std::random_device r;
-    seed_ = r();
-  }
-  explicit Sampler(int64_t range, unsigned int seed)
-      : range_(range), seed_(seed) {
-    PADDLE_ENFORCE_GT(range, 0);
+  explicit Sampler(int64_t range, unsigned int seed = 0UL) : range_(range) {
+    //    PADDLE_ENFORCE_GT(range, 0, "Range should be greater than 0.");
+    if (seed == 0) {
+      std::random_device r;
+      seed_ = r();
+    } else {
+      seed_ = seed;
+    }
   }
   virtual ~Sampler();
   // Sample a single value
@@ -42,7 +44,7 @@ class Sampler {
   // The probability that a single call to Sample() returns the given value.
   virtual float Probability(int64_t value) const = 0;
 
-  int64 range() { return range_; }
+  int64_t range() { return range_; }
 
  protected:
   const int64_t range_;
@@ -56,13 +58,11 @@ class Sampler {
  */
 class UniformSampler : public Sampler {
  public:
-  explicit UniformSampler(int64_t range);
-
-  explicit UniformSampler(int64_t range, unsigned int seed);
+  explicit UniformSampler(int64_t range, unsigned int seed = 0UL);
 
   ~UniformSampler() override {}
 
-  int64 Sample() const override;
+  int64_t Sample() const override;
 
   float Probability(int64_t value) const override;
 
@@ -79,13 +79,11 @@ class UniformSampler : public Sampler {
  */
 class LogUniformSampler : public Sampler {
  public:
-  explicit LogUniformSampler(int64_t range);
-
-  explicit LogUniformSampler(int64_t range, unsigned int seed);
+  explicit LogUniformSampler(int64_t range, unsigned int seed = 0UL);
 
   ~LogUniformSampler() override {}
 
-  int64 Sample() const override;
+  int64_t Sample() const override;
 
   float Probability(int64_t value) const override;
 
@@ -95,6 +93,29 @@ class LogUniformSampler : public Sampler {
   std::shared_ptr<std::uniform_real_distribution<>> dist_;
 };
 
+/**
+ * Sample integers from [0, range) from custom distribution.
+ */
+class CustomSampler : public Sampler {
+ public:
+  explicit CustomSampler(int64_t range, const float* probabilities,
+                         unsigned int seed = 0UL);
+
+  ~CustomSampler() override {}
+
+  int64_t Sample() const override;
+
+  float Probability(int64_t value) const override;
+
+ private:
+  std::shared_ptr<std::vector<float>> alias_probs_;
+  std::shared_ptr<std::vector<int64_t>> alias_;
+  std::shared_ptr<std::vector<float>> probs_;
+  std::shared_ptr<std::mt19937_64> random_engine_;
+  std::shared_ptr<std::uniform_real_distribution<>> real_dist_;
+  std::shared_ptr<std::uniform_int_distribution<>> int_dist_;
+};
+
 }  // namespace math
 }  // namespace operators
 }  // namespace paddle
diff --git a/paddle/fluid/operators/nce_op.cc b/paddle/fluid/operators/nce_op.cc
index 877c9a0528441a7d5b1306c3f8f8be1a5aea577a..9b0d45ae5b9d104c8b7bb1529a9baaaf3d6a736d 100644
--- a/paddle/fluid/operators/nce_op.cc
+++ b/paddle/fluid/operators/nce_op.cc
@@ -35,6 +35,7 @@ class NCEOp : public framework::OperatorWithKernel {
 
     auto x_dims = ctx->GetInputDim("Input");
     auto label_dims = ctx->GetInputDim("Label");
+    auto w_dims = ctx->GetInputDim("Weight");
     PADDLE_ENFORCE_EQ(x_dims[0], label_dims[0]);
     int num_true_classes = label_dims.size() == 2 ? label_dims[1] : 1;
     if (ctx->HasInput("Bias")) {
@@ -98,6 +99,13 @@ class NCEOpMaker : public framework::OpProtoAndCheckerMaker {
              "each sample. And it is a dispensable input. The default value of "
              "sample is 1.")
         .AsDispensable();
+
+    AddInput(
+        "CustomDistribution",
+        "(Tensor) It is used in 'CostumDist' sampler. "
+        "It is a tensor with shape [num_total_classes]."
+        "The i-th element is the probsbility of the i-th class being sampled.")
+        .AsDispensable();
     AddOutput("Cost",
               "(Tensor) A tensor of shape [batch_size, 1]. Cost of samples.");
     AddOutput("SampleLogits",
@@ -121,6 +129,17 @@ class NCEOpMaker : public framework::OpProtoAndCheckerMaker {
     AddAttr<int>("num_neg_samples",
                  "The number of negative classes. The default value is 10.")
         .SetDefault(10);
+
+    AddAttr<int>("sampler",
+                 "(int) Which sampler to be used to sample negative class."
+                 "0: Uniform; 1: LogUniform; 2: CostumDist.")
+        .SetDefault(0);
+
+    AddAttr<int>("seed",
+                 "(int) The seed used in sampler. If it is 0, "
+                 "the sampler will generate a seed randomly.")
+        .SetDefault(0);
+
     AddAttr<std::vector<int>>("custom_neg_classes",
                               "This attribute only be used in unitest. Classes "
                               "in this list wiil be used as negative classes "
diff --git a/paddle/fluid/operators/nce_op.h b/paddle/fluid/operators/nce_op.h
index 2c4c97f28bc0b511d6eaa8f79a3a4efc9be8a5da..e9af8ad4ce8501f464202039d99c36984d7feba9 100644
--- a/paddle/fluid/operators/nce_op.h
+++ b/paddle/fluid/operators/nce_op.h
@@ -19,29 +19,28 @@ limitations under the License. */
 #include <vector>
 #include "paddle/fluid/framework/eigen.h"
 #include "paddle/fluid/framework/op_registry.h"
+#include "paddle/fluid/operators/math/sampler.h"
 #include "unsupported/Eigen/CXX11/Tensor"
 namespace paddle {
 namespace operators {
 
 using Tensor = framework::Tensor;
+using Sampler = math::Sampler;
 
 template <typename T, int MajorType = Eigen::RowMajor,
           typename IndexType = Eigen::DenseIndex>
 using EigenMatrix = framework::EigenMatrix<T, MajorType, IndexType>;
 
 template <typename DeviceContext, typename T>
-void PrepareSamples(const framework::ExecutionContext& context) {
+void PrepareSamples(const framework::ExecutionContext& context,
+                    Sampler* sampler) {
   auto label = context.Input<Tensor>("Label");
   const int64_t* label_data = label->data<int64_t>();
   auto label_dims = label->dims();
-  int num_total_classes = context.Attr<int>("num_total_classes");
+  //  int num_total_classes = context.Attr<int>("num_total_classes");
   // for unitest
   std::vector<int> custom_neg_classes =
       context.Attr<std::vector<int>>("custom_neg_classes");
-  // random machine
-  std::random_device rd;
-  std::mt19937 rng(rd());
-  std::uniform_int_distribution<int> rand(0, num_total_classes - 1);
 
   auto sample_labels = context.Output<Tensor>("SampleLabels");
   auto sample_labels_dims = sample_labels->dims();
@@ -62,7 +61,7 @@ void PrepareSamples(const framework::ExecutionContext& context) {
     } else {
       for (; j < sample_labels_dims[1]; ++j) {
         // TODO(wanghaoshuang): support more distribution sampling
-        sample_labels_data[index++] = rand(rng);
+        sample_labels_data[index++] = sampler->Sample();
       }
     }
   }
@@ -72,7 +71,33 @@ template <typename DeviceContext, typename T>
 class NCEKernel : public framework::OpKernel<T> {
  public:
   void Compute(const framework::ExecutionContext& context) const override {
-    PrepareSamples<DeviceContext, T>(context);
+    int sampler_type = context.Attr<int>("sampler");
+    int seed = context.Attr<int>("seed");
+    int num_total_classes = context.Attr<int>("num_total_classes");
+    int num_neg_samples = context.Attr<int>("num_neg_samples");
+
+    Sampler* sampler;
+    switch (sampler_type) {
+      case 0: {
+        sampler = new math::UniformSampler(num_total_classes - 1, seed);
+        break;
+      }
+      case 1: {
+        sampler = new math::LogUniformSampler(num_total_classes - 1, seed);
+        break;
+      }
+      case 2: {
+        auto custom_dist = context.Input<Tensor>("CustomDistribution");
+        const float* custom_dist_data = custom_dist->data<float>();
+        PADDLE_ENFORCE_EQ(custom_dist->numel(), num_total_classes);
+        sampler = new math::CustomSampler(num_total_classes - 1,
+                                          custom_dist_data, seed);
+        break;
+      }
+      default: { PADDLE_THROW("Unsupported SamplerType."); }
+    }
+
+    PrepareSamples<DeviceContext, T>(context, sampler);
     auto sample_labels = context.Output<Tensor>("SampleLabels");
     const int64_t* sample_labels_data = sample_labels->data<int64_t>();
     auto sample_out = context.Output<Tensor>("SampleLogits");
@@ -85,13 +110,12 @@ class NCEKernel : public framework::OpKernel<T> {
     }
     auto out = context.Output<Tensor>("Cost");
     T* out_data = out->mutable_data<T>(context.GetPlace());
-    int num_neg_samples = context.Attr<int>("num_neg_samples");
-    int num_total_classes = context.Attr<int>("num_total_classes");
     int64_t num_true_class = 1;
     if (label != nullptr) {
       num_true_class = label->dims()[1];
     }
-    T b = 1. / num_total_classes * num_neg_samples;
+    int64_t sampled_labels_num = sample_labels->dims()[1];
+    //    T b = 1. / num_total_classes * num_neg_samples;
     // forward bias
     auto bias = context.Input<Tensor>("Bias");
     if (bias != nullptr) {
@@ -117,22 +141,17 @@ class NCEKernel : public framework::OpKernel<T> {
     }
     // forward cost
     for (int64_t i = 0; i < sample_labels->dims()[0]; ++i) {
-      int64_t j = 0;
       out_data[i] = 0;
       T w = sample_weight == nullptr ? 1. : sample_weight_data[i];
-      // for true classes
-      for (; j < num_true_class; ++j) {
-        T o = sample_out_data[i * sample_out->dims()[1] + j];
-        T cost = -log(o / (o + b));
-        out_data[i] += w * cost;
-      }
-      // for sampled neg classes
-      for (; j < sample_labels->dims()[1]; ++j) {
-        T o = sample_out_data[i * sample_out->dims()[1] + j];
-        T cost = -log(b / (o + b));
+      for (int64_t j = 0; j < sampled_labels_num; ++j) {
+        int64_t target = sample_labels_data[i * sampled_labels_num + j];
+        T o = sample_out_data[i * sampled_labels_num + j];
+        float b = sampler->Probability(target) * num_neg_samples;
+        T cost = (j < num_true_class) ? -log(o / (o + b)) : -log(b / (o + b));
         out_data[i] += w * cost;
       }
     }
+    delete sampler;
   }
 };
 
@@ -158,20 +177,45 @@ class NCEGradKernel : public framework::OpKernel<T> {
     if (label != nullptr) {
       num_true_class = label->dims()[1];
     }
-    T b = 1. / num_total_classes * num_neg_samples;
+
+    int sampler_type = context.Attr<int>("sampler");
+    int seed = context.Attr<int>("seed");
+    Sampler* sampler;
+    switch (sampler_type) {
+      case 0: {
+        sampler = new math::UniformSampler(num_total_classes - 1, seed);
+        break;
+      }
+      case 1: {
+        sampler = new math::LogUniformSampler(num_total_classes - 1, seed);
+        break;
+      }
+      case 2: {
+        auto custom_dist = context.Input<Tensor>("CustomDistribution");
+        const float* custom_dist_data = custom_dist->data<float>();
+        PADDLE_ENFORCE_EQ(custom_dist->numel(), num_total_classes);
+        sampler = new math::CustomSampler(num_total_classes - 1,
+                                          custom_dist_data, seed);
+        break;
+      }
+      default: { PADDLE_THROW("Unsupported SamplerType."); }
+    }
+
+    //    T b = 1. / num_total_classes * num_neg_samples;
     Tensor sample_grad;  // tmp tensor
     T* sample_grad_data =
         sample_grad.mutable_data<T>(sample_labels->dims(), context.GetPlace());
     // backward cost
     for (int64_t i = 0; i < sample_labels->numel(); ++i) {
+      int64_t label_idx = i % sample_labels->dims()[1];
+      int64_t sample_idx = i / sample_labels->dims()[1];
+      float b = sampler->Probability(sample_labels_data[i]) * num_neg_samples;
       T o = sample_out_data[i];
-      T w = sample_weight == nullptr
-                ? 1
-                : sample_weight_data[i / sample_labels->dims()[1]];
-      sample_grad_data[i] = (i % sample_labels->dims()[1]) < num_true_class
+      T w = sample_weight == nullptr ? 1 : sample_weight_data[sample_idx];
+      sample_grad_data[i] = label_idx < num_true_class
                                 ? w * (b / (o + b)) * (o - 1)
                                 : w * (o * (1 - o) / (o + b));
-      sample_grad_data[i] *= d_out_data[i / sample_labels->dims()[1]];
+      sample_grad_data[i] *= d_out_data[sample_idx];
     }
     // get d_bias
     auto d_bias = context.Output<Tensor>(framework::GradVarName("Bias"));
@@ -207,6 +251,7 @@ class NCEGradKernel : public framework::OpKernel<T> {
             w_matrix.chip(sample_labels_data[i], 0) * sample_grad_data[i];
       }
     }
+    delete sampler;
   }
 };
 }  // namespace operators
diff --git a/paddle/fluid/operators/warpctc_cudnn_op.cu.cc b/paddle/fluid/operators/warpctc_cudnn_op.cu.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a764d59410c90535dbda0b3f11e89ae9bf578c04
--- /dev/null
+++ b/paddle/fluid/operators/warpctc_cudnn_op.cu.cc
@@ -0,0 +1,195 @@
+/* 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/mixed_vector.h"
+#include "paddle/fluid/operators/math/softmax.h"
+#include "paddle/fluid/operators/warpctc_op.h"
+#include "paddle/fluid/platform/cudnn_helper.h"
+
+namespace paddle {
+namespace operators {
+
+#if CUDNN_VERSION >= 7001
+using ScopedTensorDescriptor = platform::ScopedTensorDescriptor;
+using ScopedCTCLossDescriptor = platform::ScopedCTCLossDescriptor;
+using DataLayout = platform::DataLayout;
+
+template <typename DeviceContext, typename T>
+class CudnnCTCKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    // =====================Copied code from warpctc===========================
+    auto* logits = ctx.Input<LoDTensor>("Logits");
+    auto* label = ctx.Input<LoDTensor>("Label");
+    auto* warpctc_grad = ctx.Output<LoDTensor>("WarpCTCGrad");
+    auto* loss = ctx.Output<LoDTensor>("Loss");
+
+    const size_t level = 0;
+
+    auto logits_lod = framework::ToAbsOffset(logits->lod());
+    auto logits_dims = logits->dims();
+    PADDLE_ENFORCE_EQ(logits_dims[0],
+                      static_cast<int64_t>(logits_lod[level].back()),
+                      "The first dimension of Input(Logits) should be equal to "
+                      "the sum of all sequences' lengths.");
+
+    auto label_lod = framework::ToAbsOffset(label->lod());
+    auto label_dims = label->dims();
+    PADDLE_ENFORCE_EQ(
+        label_dims[0], label->numel(),
+        "The width of each timestep in Input(Label) should be 1.");
+
+    const size_t num_sequences = logits_lod[level].size() - 1;
+    PADDLE_ENFORCE_EQ(num_sequences, label_lod[level].size() - 1,
+                      "The number of sequences of Input(Logits) should be "
+                      "equal to that of Input(Label).");
+    PADDLE_ENFORCE_LE(num_sequences, 256,
+                      "The labelLengths must less than 256 for cudnn call.");
+
+    const size_t sequence_width = logits->numel() / logits_dims[0];
+    auto loss_dims =
+        framework::make_ddim({static_cast<int64_t>(num_sequences), 1});
+
+    // NOTE: cudnn takes softmax input, calculate softmax first, then do padding
+    auto& dev_ctx = ctx.template device_context<platform::CUDADeviceContext>();
+    LoDTensor softmax_logits;
+    softmax_logits.mutable_data<T>(logits->dims(), ctx.GetPlace());
+    softmax_logits.set_lod(logits_lod);
+    int rank = logits->dims().size();
+    Tensor in_2d = framework::ReshapeToMatrix(*logits, rank - 1);
+    Tensor out_2d = framework::ReshapeToMatrix(softmax_logits, rank - 1);
+    math::SoftmaxFunctor<DeviceContext, T, false>()(dev_ctx, &in_2d, &out_2d);
+
+    // ctc needs sequences data stored in transposed padding format
+    // logits and grad using padding data of layout 'TNC'
+    // T: max_sequence_length
+    // N: batch_size (num_sequences)
+    // C: width
+    LoDTensor warpctc_logits;
+    const size_t max_sequence_length =
+        math::MaximumSequenceLength(logits_lod[level]);
+    auto warpctc_logits_dims =
+        framework::make_ddim({static_cast<int64_t>(max_sequence_length),
+                              static_cast<int64_t>(num_sequences),
+                              static_cast<int64_t>(sequence_width)});
+    warpctc_logits.mutable_data<T>(warpctc_logits_dims, ctx.GetPlace());
+
+    LoDTensor cpu_pad_value;
+    T* pad_value_data =
+        cpu_pad_value.mutable_data<T>({1}, platform::CPUPlace());
+    *pad_value_data = static_cast<T>(0);
+    LoDTensor pad_value;
+    if (platform::is_cpu_place(ctx.GetPlace())) {
+      pad_value = cpu_pad_value;
+    } else {
+      TensorCopySync(cpu_pad_value, ctx.GetPlace(), &pad_value);
+    }
+
+    math::PaddingLoDTensorFunctor<DeviceContext, T>()(
+        ctx.template device_context<DeviceContext>(), softmax_logits,
+        &warpctc_logits, pad_value, -1, 0, false /* norm_by_times */,
+        math::kLengthBatchWidth);
+    const T* warpctc_logits_data = warpctc_logits.data<T>();
+
+    std::vector<int> warpctc_label_lengths(num_sequences);
+    std::vector<int> warpctc_logits_lengths(num_sequences);
+
+    for (size_t i = 0; i < num_sequences; ++i) {
+      warpctc_label_lengths[i] = label_lod[level][i + 1] - label_lod[level][i];
+      warpctc_logits_lengths[i] =
+          logits_lod[level][i + 1] - logits_lod[level][i];
+    }
+
+    T* warpctc_grad_data =
+        warpctc_grad->mutable_data<T>(warpctc_logits.dims(), ctx.GetPlace());
+
+    math::SetConstant<DeviceContext, T>()(
+        ctx.template device_context<DeviceContext>(), warpctc_grad,
+        static_cast<T>(0));
+
+    Tensor warpctc_label;
+    TensorCopySync(*label, platform::CPUPlace(), &warpctc_label);
+    const int* warpctc_label_data = warpctc_label.data<int>();
+    // ========================================================================
+
+    ScopedTensorDescriptor logits_desc;
+    ScopedTensorDescriptor grad_desc;
+    ScopedCTCLossDescriptor ctcloss_desc;
+    // layout here doesn't have effect.
+    DataLayout layout = DataLayout::kNCHW;
+
+    auto cu_logits_desc = logits_desc.descriptor<T>(
+        layout, framework::vectorize2int(warpctc_logits.dims()));
+    auto cu_grad_desc = grad_desc.descriptor<T>(
+        layout, framework::vectorize2int(warpctc_grad->dims()));
+    auto cu_ctcloss_desc = ctcloss_desc.descriptor<T>();
+
+    auto handle = dev_ctx.cudnn_handle();
+    size_t workspace_size;
+
+    CUDNN_ENFORCE(platform::dynload::cudnnGetCTCLossWorkspaceSize(
+        handle, cu_logits_desc, cu_grad_desc, warpctc_label_data,
+        warpctc_label_lengths.data(), warpctc_logits_lengths.data(),
+        CUDNN_CTC_LOSS_ALGO_DETERMINISTIC, cu_ctcloss_desc, &workspace_size));
+
+    T* loss_data = loss->mutable_data<T>(loss_dims, ctx.GetPlace());
+
+    auto workspace_handle = dev_ctx.cudnn_workspace_handle();
+    auto cudnn_func = [&](void* cudnn_workspace) {
+      CUDNN_ENFORCE(platform::dynload::cudnnCTCLoss(
+          handle, cu_logits_desc, warpctc_logits_data, warpctc_label_data,
+          warpctc_label_lengths.data(), warpctc_logits_lengths.data(),
+          loss_data, cu_grad_desc, warpctc_grad_data,
+          CUDNN_CTC_LOSS_ALGO_DETERMINISTIC, cu_ctcloss_desc, cudnn_workspace,
+          workspace_size));
+    };
+    workspace_handle.RunFunc(cudnn_func, workspace_size);
+  }
+};
+
+template <typename DeviceContext, typename T>
+class CudnnCTCGradKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    auto* warpctc_grad = ctx.Input<LoDTensor>("WarpCTCGrad");
+    auto* logits_grad = ctx.Output<LoDTensor>(framework::GradVarName("Logits"));
+    const Tensor* loss_grad = ctx.Input<Tensor>(framework::GradVarName("Loss"));
+
+    logits_grad->mutable_data<T>(ctx.GetPlace());
+    bool norm_by_times = ctx.Attr<bool>("norm_by_times");
+    math::UnpaddingLoDTensorFunctor<DeviceContext, T>()(
+        ctx.template device_context<DeviceContext>(), *warpctc_grad,
+        logits_grad, -1, 0, norm_by_times, math::kLengthBatchWidth);
+
+    const T* loss_grad_data = loss_grad->data<T>();
+    math::ScaleLoDTensorFunctor<DeviceContext, T>()(
+        ctx.template device_context<DeviceContext>(), loss_grad_data,
+        logits_grad);
+  }
+};
+
+#endif
+}  // namespace operators
+}  // namespace paddle
+
+namespace ops = paddle::operators;
+namespace plat = paddle::platform;
+#if CUDNN_VERSION >= 7001
+REGISTER_OP_KERNEL(
+    warpctc, CUDNN, plat::CUDAPlace,
+    ops::CudnnCTCKernel<paddle::platform::CUDADeviceContext, float>);
+REGISTER_OP_KERNEL(
+    warpctc_grad, CUDNN, plat::CUDAPlace,
+    ops::CudnnCTCGradKernel<paddle::platform::CUDADeviceContext, float>);
+#endif
diff --git a/paddle/fluid/operators/warpctc_op.cc b/paddle/fluid/operators/warpctc_op.cc
index e06c8c962f45a4e91b7efed7431571f0fc6870a3..6a257cebf523bfeb1951b709480140e733126f6a 100644
--- a/paddle/fluid/operators/warpctc_op.cc
+++ b/paddle/fluid/operators/warpctc_op.cc
@@ -14,6 +14,10 @@ limitations under the License. */
 
 #include "paddle/fluid/operators/warpctc_op.h"
 
+#ifdef PADDLE_WITH_CUDA
+#include "paddle/fluid/platform/cudnn_helper.h"
+#endif
+
 namespace paddle {
 namespace operators {
 
@@ -45,9 +49,16 @@ class WarpCTCOp : public framework::OperatorWithKernel {
  protected:
   framework::OpKernelType GetExpectedKernelType(
       const framework::ExecutionContext& ctx) const override {
+    framework::LibraryType library_{framework::LibraryType::kPlain};
+#ifdef PADDLE_WITH_CUDA
+    if (platform::CanCUDNNBeUsed(ctx)) {
+      library_ = framework::LibraryType::kCUDNN;
+    }
+#endif
+    framework::DataLayout layout_ = framework::DataLayout::kAnyLayout;
     return framework::OpKernelType(
         framework::ToDataType(ctx.Input<Tensor>("Logits")->type()),
-        ctx.device_context());
+        ctx.device_context(), layout_, library_);
   }
 };
 
@@ -86,6 +97,10 @@ class WarpCTCOpMaker : public framework::OpProtoAndCheckerMaker {
                   "normalize the gradients by the number of time-step, "
                   "which is also the sequence's length.")
         .SetDefault(false);
+    AddAttr<bool>("use_cudnn",
+                  "(bool, default: false), whether to "
+                  "use cudnn kernel.")
+        .SetDefault(false);
     AddComment(R"DOC(
 An operator integrating the open-source
 [warp-ctc](https://github.com/baidu-research/warp-ctc) library, which is used in
diff --git a/paddle/fluid/platform/cudnn_helper.h b/paddle/fluid/platform/cudnn_helper.h
index 07bb02be1962f758e50cab1f27de43e89f3953c3..f174a7bc4867634df01367cc0091b0ec55849985 100644
--- a/paddle/fluid/platform/cudnn_helper.h
+++ b/paddle/fluid/platform/cudnn_helper.h
@@ -380,5 +380,28 @@ inline bool CanCUDNNBeUsed(const framework::ExecutionContext& ctx) {
   return use_cudnn;
 }
 
+#if CUDNN_VERSION >= 7001
+class ScopedCTCLossDescriptor {
+ public:
+  ScopedCTCLossDescriptor() {
+    PADDLE_ENFORCE(dynload::cudnnCreateCTCLossDescriptor(&desc_));
+  }
+  ~ScopedCTCLossDescriptor() {
+    PADDLE_ENFORCE(dynload::cudnnDestroyCTCLossDescriptor(desc_));
+  }
+
+  template <typename T>
+  inline cudnnCTCLossDescriptor_t descriptor() {
+    PADDLE_ENFORCE(
+        dynload::cudnnSetCTCLossDescriptor(desc_, CudnnDataType<T>::type));
+    return desc_;
+  }
+
+ private:
+  cudnnCTCLossDescriptor_t desc_;
+  DISABLE_COPY_AND_ASSIGN(ScopedCTCLossDescriptor);
+};
+#endif
+
 }  // namespace platform
 }  // namespace paddle
diff --git a/paddle/fluid/platform/dynload/cudnn.h b/paddle/fluid/platform/dynload/cudnn.h
index c26143d2f2780f3042f66b99808c6b85866f9dc4..db2e28bc911a05a077c786c57c4f0e4c34bd61f7 100644
--- a/paddle/fluid/platform/dynload/cudnn.h
+++ b/paddle/fluid/platform/dynload/cudnn.h
@@ -154,7 +154,13 @@ CUDNN_DNN_ROUTINE_EACH_R5(DECLARE_DYNAMIC_LOAD_CUDNN_WRAP)
 #if CUDNN_VERSION >= 7001
 #define CUDNN_DNN_ROUTINE_EACH_R7(__macro) \
   __macro(cudnnSetConvolutionGroupCount);  \
-  __macro(cudnnSetConvolutionMathType);
+  __macro(cudnnSetConvolutionMathType);    \
+  __macro(cudnnCreateCTCLossDescriptor);   \
+  __macro(cudnnDestroyCTCLossDescriptor);  \
+  __macro(cudnnGetCTCLossDescriptor);      \
+  __macro(cudnnSetCTCLossDescriptor);      \
+  __macro(cudnnGetCTCLossWorkspaceSize);   \
+  __macro(cudnnCTCLoss);
 CUDNN_DNN_ROUTINE_EACH_R7(DECLARE_DYNAMIC_LOAD_CUDNN_WRAP)
 #endif
 
diff --git a/python/paddle/fluid/layers/io.py b/python/paddle/fluid/layers/io.py
index 8e18a6e784bab98bb8b5a89ec1b0399479ab5769..3f47053961bcc41b82f1b6776e9365166e78ddbf 100644
--- a/python/paddle/fluid/layers/io.py
+++ b/python/paddle/fluid/layers/io.py
@@ -404,8 +404,8 @@ def open_recordio_file(filename,
 
     startup_var.desc.set_dtypes(dtypes)
     startup_var.persistable = True
-    main_prog_var = _copy_reader_var_(
-        default_main_program().current_block(), startup_var)
+    main_prog_var = _copy_reader_var_(default_main_program().current_block(),
+                                      startup_var)
 
     if pass_num > 1:
         main_prog_var = multi_pass(reader=main_prog_var, pass_num=pass_num)
diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index 4bf475946da88d0543629dcd674fc28b91cf348b..9465d9756477e204d0e24dbb124f3a60d7c3fe4f 100644
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -4193,7 +4193,7 @@ def ctc_greedy_decoder(input, blank, name=None):
     return ctc_out
 
 
-def warpctc(input, label, blank=0, norm_by_times=False):
+def warpctc(input, label, blank=0, norm_by_times=False, use_cudnn=False):
     """
     An operator integrating the open source Warp-CTC library
     (https://github.com/baidu-research/warp-ctc)
@@ -4218,6 +4218,7 @@ def warpctc(input, label, blank=0, norm_by_times=False):
          by the number of time-step, which is also the sequence's length.
          There is no need to normalize the gradients if warpctc layer was
          follewed by a mean_op.
+       use_cudnn (bool, default false): Whether to use cudnn.
 
     Returns:
         Variable: The Connectionist Temporal Classification (CTC) loss,
@@ -4241,8 +4242,11 @@ def warpctc(input, label, blank=0, norm_by_times=False):
                 'Label': [label]},
         outputs={'WarpCTCGrad': [grad_out],
                  'Loss': [loss_out]},
-        attrs={'blank': blank,
-               'norm_by_times': norm_by_times})
+        attrs={
+            'blank': blank,
+            'norm_by_times': norm_by_times,
+            'use_cudnn': use_cudnn
+        })
     return loss_out
 
 
@@ -4315,7 +4319,10 @@ def nce(input,
         param_attr=None,
         bias_attr=None,
         num_neg_samples=None,
-        name=None):
+        name=None,
+        sampler="uniform",
+        custom_dist=None,
+        seed=0):
     """
     ${comment}
 
@@ -4338,6 +4345,14 @@ def nce(input,
         num_neg_samples (int): ${num_neg_samples_comment}
         name (str|None): A name for this layer(optional). If set None, the layer
              will be named automatically. Default: None.
+        sampler (str): The sampler used to sample class from negtive classes.
+                       It can be 'uniform', 'log_uniform' or 'custom_dist'.
+                       default: 'uniform'.
+        custom_dist (Variable): A tensor with shape [num_total_classes]. 
+                       It is used when sampler is set to 'custom_dist'.
+                       custom_dist[i] is the probsbility of i-th class to be sampled.
+                       default: None.
+        seed (int): The seed used in sampler. default: 0.
 
     Returns:
         Variable: The output nce loss.
@@ -4367,6 +4382,16 @@ def nce(input,
             loss = layers.nce(input=embs, label=words[label_word],
                           num_total_classes=dict_size, param_attr='nce.w',
                           bias_attr='nce.b')
+
+            #or use custom distribution
+            dist = fluid.layers.assign(input=np.array([0.05,0.5,0.1,0.3,0.05]).astype("float32"))
+            loss = layers.nce(input=embs, label=words[label_word],
+                          num_total_classes=5, param_attr='nce.w',
+                          bias_attr='nce.b',
+                          num_neg_samples=3,
+                          sampler="custom_dist",
+                          custom_dist=dist)
+            
     """
     helper = LayerHelper('nce', **locals())
     assert isinstance(input, Variable)
@@ -4401,9 +4426,31 @@ def nce(input,
     else:
         num_neg_samples = int(num_neg_samples)
 
+    inputs = {
+        'Input': input,
+        'Label': label,
+        'Weight': w,
+        'Bias': b,
+        'SampleWeight': sample_weight if sample_weight is not None else []
+    }
+
+    if sampler == "uniform":
+        sampler = 0
+    elif sampler == "log_uniform":
+        sampler = 1
+    elif sampler == "custom_dist":
+        assert custom_dist is not None
+        assert isinstance(custom_dist, Variable)
+        inputs['CustomDistribution'] = custom_dist
+        sampler = 2
+    else:
+        raise Exception("Unsupported sampler type.")
+
     attrs = {
         'num_total_classes': int(num_total_classes),
-        'num_neg_samples': num_neg_samples
+        'num_neg_samples': num_neg_samples,
+        'seed': seed,
+        'sampler': sampler
     }
 
     helper.append_op(
diff --git a/python/paddle/fluid/tests/unittests/test_infer_shape.py b/python/paddle/fluid/tests/unittests/test_infer_shape.py
index fdff22cacc28731a91ff4fd17407bd9edbdd9d8b..9d5e064e6adabe09094350db2976f83d835520eb 100644
--- a/python/paddle/fluid/tests/unittests/test_infer_shape.py
+++ b/python/paddle/fluid/tests/unittests/test_infer_shape.py
@@ -83,6 +83,34 @@ class TestInferShape(unittest.TestCase):
         mul_op_desc.infer_shape(block)
         self.assertEqual(out.shape(), [x_shape[0], y_shape[1]])
 
+    def test_expand_op(self):
+        prog = core.ProgramDesc()
+        self.assertIsNotNone(prog)
+        block = prog.block(0)
+        self.assertIsNotNone(block)
+
+        shape = [-1, 20]
+        expand_times = [3, 1]
+
+        # prepare input/output
+        x1 = block.var(six.b("x"))
+        x1.set_type(core.VarDesc.VarType.LOD_TENSOR)
+        x1.set_shape(shape)
+
+        out = block.var(six.b("out"))
+        out.set_type(core.VarDesc.VarType.LOD_TENSOR)
+
+        # prepare the operator
+        sum_op_desc = block.append_op()
+        sum_op_desc.set_type("expand")
+        sum_op_desc.set_input("X", ["x"])
+        sum_op_desc.set_output("Out", ["out"])
+        sum_op_desc._set_attr('expand_times', expand_times)
+
+        sum_op_desc.check_attrs()
+        sum_op_desc.infer_shape(block)
+        self.assertEqual(out.shape(), shape)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/python/paddle/fluid/tests/unittests/test_nce.py b/python/paddle/fluid/tests/unittests/test_nce.py
index 0745bd274f73715b6fdec236819b8d89827e1346..c01fdd5dddc139bdefc07b91e9816d62febd7f20 100644
--- a/python/paddle/fluid/tests/unittests/test_nce.py
+++ b/python/paddle/fluid/tests/unittests/test_nce.py
@@ -68,7 +68,9 @@ class TestNCE(OpTest):
         self.attrs = {
             'num_total_classes': num_classes,
             'num_neg_samples': num_neg_samples,
-            'custom_neg_classes': list(range(num_neg_samples))
+            'custom_neg_classes': list(range(num_neg_samples)),
+            'seed': 0,
+            'sampler': 0
         }
         self.inputs = {
             'Input': input,
diff --git a/python/paddle/fluid/tests/unittests/test_warpctc_op.py b/python/paddle/fluid/tests/unittests/test_warpctc_op.py
index 5e3aa13546d0c4fdcde4a3d6378d5a1748327814..ec0592baa22b6215035d2b9ad80e00081eb59126 100644
--- a/python/paddle/fluid/tests/unittests/test_warpctc_op.py
+++ b/python/paddle/fluid/tests/unittests/test_warpctc_op.py
@@ -183,6 +183,7 @@ class TestWarpCTCOp(OpTest):
         self.labels_lod = [[3, 1, 4, 4]]
         self.blank = self.num_classes - 1
         self.norm_by_times = False
+        self.use_cudnn = False
 
     def setUp(self):
         self.op_type = "warpctc"
@@ -215,7 +216,11 @@ class TestWarpCTCOp(OpTest):
             "Label": (labels, self.labels_lod)
         }
         self.outputs = {"Loss": loss}
-        self.attrs = {"blank": self.blank, "norm_by_times": self.norm_by_times}
+        self.attrs = {
+            "blank": self.blank,
+            "norm_by_times": self.norm_by_times,
+            "use_cudnn": self.use_cudnn
+        }
 
     def test_check_output(self):
         self.check_output()
@@ -233,6 +238,22 @@ class TestWarpCTCOpCase1(TestWarpCTCOp):
         self.labels_lod = [[3, 1, 4, 4]]
         self.blank = 0
         self.norm_by_times = False
+        self.use_cudnn = False
+
+
+class TestCudnnCTCOp(TestWarpCTCOp):
+    def config(self):
+        self.batch_size = 4
+        self.num_classes = 8
+        self.logits_lod = [[4, 1, 3, 3]]
+        self.labels_lod = [[3, 1, 4, 4]]
+        self.blank = 0
+        self.norm_by_times = False
+        self.use_cudnn = True
+
+    def test_check_grad(self):
+        self.outputs['WarpCTCGrad'] = self.gradient
+        self.check_grad(["Logits"], "Loss", max_relative_error=0.01)
 
 
 if __name__ == "__main__":