diff --git a/doc/fluid/new_docs/user_guides/howto/inference/native_infer.rst b/doc/fluid/new_docs/user_guides/howto/inference/native_infer.rst
index 21a6fe5cf54d0c0c760ade4ba602024ffa29675f..6d6f3035c0b5c985cd39d45df9f1bcce50dcefa0 100644
--- a/doc/fluid/new_docs/user_guides/howto/inference/native_infer.rst
+++ b/doc/fluid/new_docs/user_guides/howto/inference/native_infer.rst
@@ -4,13 +4,12 @@ Paddle 预测 API
 为了更简单方便的预测部署，Fluid 提供了一套高层 API
 用来隐藏底层不同的优化实现。
 
-`预测库相关代码 <https://github.com/PaddlePaddle/Paddle/tree/develop/paddle/contrib/inference>`__
+`预测库相关代码 <https://github.com/PaddlePaddle/Paddle/tree/develop/paddle/fluid/inference/api>`_
 包括
 
 -  头文件 ``paddle_inference_api.h`` 定义了所有的接口
 -  库文件\ ``libpaddle_fluid.so`` 或 ``libpaddle_fluid.a``
--  库文件 ``libpaddle_inference_api.so`` 或
-   ``libpaddle_inference_api.a``
+
 
 编译和依赖可以参考 :ref:`install_or_build_cpp_inference_lib` 。
 
@@ -97,8 +96,7 @@ engine
     CHECK(predictor->Run(slots, &outputs));
     // 获取 outputs ...
 
-编译时，联编 ``libpaddle_fluid.a/.so`` 和
-``libpaddle_inference_api.a/.so`` 便可。
+编译时，联编 ``libpaddle_fluid.a/.so`` 便可。
 
 详细代码参考
 ------------
diff --git a/paddle/fluid/API.spec b/paddle/fluid/API.spec
index bb5f2894c08b5d8941ad8914f6b83280aa053e37..6b1aee5667e92a45a19226fa33058df5e0cb89e2 100644
--- a/paddle/fluid/API.spec
+++ b/paddle/fluid/API.spec
@@ -312,7 +312,7 @@ paddle.fluid.layers.iou_similarity ArgSpec(args=[], varargs='args', keywords='kw
 paddle.fluid.layers.box_coder ArgSpec(args=[], varargs='args', keywords='kwargs', defaults=None)
 paddle.fluid.layers.polygon_box_transform ArgSpec(args=[], varargs='args', keywords='kwargs', defaults=None)
 paddle.fluid.layers.accuracy ArgSpec(args=['input', 'label', 'k', 'correct', 'total'], varargs=None, keywords=None, defaults=(1, None, None))
-paddle.fluid.layers.auc ArgSpec(args=['input', 'label', 'curve', 'num_thresholds', 'topk'], varargs=None, keywords=None, defaults=('ROC', 200, 1))
+paddle.fluid.layers.auc ArgSpec(args=['input', 'label', 'curve', 'num_thresholds', 'topk'], varargs=None, keywords=None, defaults=('ROC', 4095, 1))
 paddle.fluid.layers.exponential_decay ArgSpec(args=['learning_rate', 'decay_steps', 'decay_rate', 'staircase'], varargs=None, keywords=None, defaults=(False,))
 paddle.fluid.layers.natural_exp_decay ArgSpec(args=['learning_rate', 'decay_steps', 'decay_rate', 'staircase'], varargs=None, keywords=None, defaults=(False,))
 paddle.fluid.layers.inverse_time_decay ArgSpec(args=['learning_rate', 'decay_steps', 'decay_rate', 'staircase'], varargs=None, keywords=None, defaults=(False,))
diff --git a/paddle/fluid/framework/details/multi_devices_graph_pass.cc b/paddle/fluid/framework/details/multi_devices_graph_pass.cc
index 0bfff745493d069e948e6d277ec2bbfb0673a70b..7a99169849debcbc57d6f197b36c5045b211f3ef 100644
--- a/paddle/fluid/framework/details/multi_devices_graph_pass.cc
+++ b/paddle/fluid/framework/details/multi_devices_graph_pass.cc
@@ -326,7 +326,7 @@ std::unique_ptr<ir::Graph> MultiDevSSAGraphBuilder::ApplyImpl(
   ir::Graph &result = *graph;
 
   for (auto &node : nodes) {
-    if (node->NodeType() == ir::Node::Type::kVariable && node->Var()) {
+    if (node->IsVar() && node->Var()) {
       all_vars_.emplace(node->Name(), node->Var());
     }
   }
@@ -583,18 +583,6 @@ void MultiDevSSAGraphBuilder::InsertDataBalanceOp(
   }
 }
 
-bool MultiDevSSAGraphBuilder::IsParameterGradientOnce(
-    const std::string &og,
-    std::unordered_set<std::string> *og_has_been_broadcast) const {
-  bool is_pg_once =
-      grad_names_.count(og) != 0 && og_has_been_broadcast->count(og) == 0;
-  if (is_pg_once) {
-    // Insert NCCL AllReduce Op
-    og_has_been_broadcast->insert(og);
-  }
-  return is_pg_once;
-}
-
 int MultiDevSSAGraphBuilder::GetOpDeviceID(const ir::Graph &graph,
                                            ir::Node *node) const {
   if (strategy_.reduce_ != BuildStrategy::ReduceStrategy::kReduce) {
@@ -688,20 +676,6 @@ VarHandle *MultiDevSSAGraphBuilder::CreateReduceOp(ir::Graph *result,
   return var;
 }
 
-// Find the first occurence of `prev_op_name` and make current `op` depend
-// on it.
-void MultiDevSSAGraphBuilder::ConnectOp(ir::Graph *result, OpHandleBase *op,
-                                        const std::string &prev_op_name) const {
-  for (auto &prev_op : result->Get<GraphOps>(kGraphOps)) {
-    if (prev_op->Name() == prev_op_name) {
-      auto *dep_var = new DummyVarHandle(result->CreateControlDepVar());
-      prev_op->AddOutput(dep_var);
-      result->Get<GraphDepVars>(kGraphDepVars).emplace(dep_var);
-      op->AddInput(dep_var);
-    }
-  }
-}
-
 void MultiDevSSAGraphBuilder::CreateDistTrainOp(ir::Graph *result,
                                                 ir::Node *node) const {
   int op_dev_id = -1;
diff --git a/paddle/fluid/framework/details/multi_devices_graph_pass.h b/paddle/fluid/framework/details/multi_devices_graph_pass.h
index 7a6f238f9cf7af18cb10ea271e453fec1902c833..ac6d9c5a64cfde60f75c76dae0a30cc7d735e996 100644
--- a/paddle/fluid/framework/details/multi_devices_graph_pass.h
+++ b/paddle/fluid/framework/details/multi_devices_graph_pass.h
@@ -69,9 +69,6 @@ class MultiDevSSAGraphBuilder : public ir::Pass {
   std::vector<std::string> FindDistTrainRecvVars(
       const std::vector<ir::Node *> &nodes) const;
 
-  void ConnectOp(ir::Graph *result, OpHandleBase *op,
-                 const std::string &prev_op_name) const;
-
   void CreateComputationalOps(ir::Graph *result, ir::Node *node,
                               size_t num_places) const;
 
@@ -83,10 +80,6 @@ class MultiDevSSAGraphBuilder : public ir::Pass {
   void CreateComputationalOp(ir::Graph *result, ir::Node *node,
                              int dev_id) const;
 
-  bool IsParameterGradientOnce(
-      const std::string &og,
-      std::unordered_set<std::string> *og_has_been_broadcast) const;
-
   int GetOpDeviceID(const ir::Graph &graph, ir::Node *node) const;
 
   void InsertAllReduceOp(ir::Graph *result, const std::string &og) const;
diff --git a/paddle/fluid/framework/ir/fc_lstm_fuse_pass.cc b/paddle/fluid/framework/ir/fc_lstm_fuse_pass.cc
index 55153ecc3ed35688d8f861bde0f44ae2bf6a7111..0d69dfa79aa26940f8f56f84b35ffed34f29f703 100644
--- a/paddle/fluid/framework/ir/fc_lstm_fuse_pass.cc
+++ b/paddle/fluid/framework/ir/fc_lstm_fuse_pass.cc
@@ -86,15 +86,24 @@ int BuildFusion(Graph* graph, const std::string& name_scope, Scope* scope,
       }
       op_desc.SetInput("Bias", {new_bias_var});
     }
-
 #undef GET_NODE
 
+    // Create temp variables.
+    scope->Var(name_scope + "/BatchedInput.new")
+        ->GetMutable<framework::LoDTensor>();
+    scope->Var(name_scope + "/BatchCellPreAct.new")
+        ->GetMutable<framework::LoDTensor>();
+    scope->Var(name_scope + "/BatchedGate.new")
+        ->GetMutable<framework::LoDTensor>();
+
     op_desc.SetInput("H0", {});
     op_desc.SetInput("C0", {});
     op_desc.SetOutput("Hidden", {hidden_n->Name()});
     op_desc.SetOutput("Cell", {cell_n->Name()});
     op_desc.SetOutput("XX", {xx_n->Name()});
-    op_desc.SetOutput("BatchedInput", {"blstm_0.tmp_2"});
+    op_desc.SetOutput("BatchedGate", {name_scope + "/BatchedGate.new"});
+    op_desc.SetOutput("BatchCellPreAct", {name_scope + "/BatchCellPreAct.new"});
+    op_desc.SetOutput("BatchedInput", {name_scope + "/BatchedInput.new"});
     op_desc.SetAttr("is_reverse", lstm_n->Op()->GetAttr("is_reverse"));
     op_desc.SetAttr("use_peepholes", lstm_n->Op()->GetAttr("use_peepholes"));
     // TODO(TJ): get from attr
@@ -130,8 +139,8 @@ int BuildFusion(Graph* graph, const std::string& name_scope, Scope* scope,
 
   int fusion_count{0};
 
-  auto fc_no_bias_handler = [&](
-      const GraphPatternDetector::subgraph_t& subgraph, Graph* g) {
+  auto handler = [&](const GraphPatternDetector::subgraph_t& subgraph,
+                     Graph* g) {
 #define GET_NODE(name__)                                \
   std::string name__##key = name_scope + "/" + #name__; \
   auto* name__##n = pattern->RetrieveNode(name__##key); \
@@ -152,21 +161,24 @@ int BuildFusion(Graph* graph, const std::string& name_scope, Scope* scope,
 
     if (with_fc_bias) {
       GET_NODE(fc_bias);
+      GET_NODE(elementwise_add);
       lstm_creator(lstm, x, w, Weight, Bias, Hidden, Cell, fc_out, fc_bias);
+      // Remove unneeded nodes.
+      std::unordered_set<const Node*> marked_nodes(
+          {mul_n, lstm_n, elementwise_add_n});
+      GraphSafeRemoveNodes(graph, marked_nodes);
     } else {
       lstm_creator(lstm, x, w, Weight, Bias, Hidden, Cell, fc_out, -1);
+      // Remove unneeded nodes.
+      std::unordered_set<const Node*> marked_nodes({mul_n, lstm_n});
+      GraphSafeRemoveNodes(graph, marked_nodes);
     }
 #undef GET_NODE
 
-    // Remove unneeded nodes.
-    std::unordered_set<const Node*> marked_nodes({mul_n, lstm_n});
-
-    GraphSafeRemoveNodes(graph, marked_nodes);
-
     ++fusion_count;
   };
 
-  gpd(graph, fc_no_bias_handler);
+  gpd(graph, handler);
 
   return fusion_count;
 }
diff --git a/paddle/fluid/framework/ir/fc_lstm_fuse_pass.h b/paddle/fluid/framework/ir/fc_lstm_fuse_pass.h
index 5a6687872eb3ab4a032227fda9ff0e7f5254670b..3ee32c63a46fcc34bdccd1e14d4bbaf9668c49e9 100644
--- a/paddle/fluid/framework/ir/fc_lstm_fuse_pass.h
+++ b/paddle/fluid/framework/ir/fc_lstm_fuse_pass.h
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#pragma once
+
 #include "paddle/fluid/framework/ir/fuse_pass_base.h"
 #include "paddle/fluid/framework/ir/graph.h"
 #include "paddle/fluid/framework/ir/graph_pattern_detector.h"
diff --git a/paddle/fluid/framework/ir/graph_pattern_detector.cc b/paddle/fluid/framework/ir/graph_pattern_detector.cc
index 2b1a9b8d0942d98b8bacee359f452f3d139b481b..731b89423354532f684e19305dfa87e8eb75d4b1 100644
--- a/paddle/fluid/framework/ir/graph_pattern_detector.cc
+++ b/paddle/fluid/framework/ir/graph_pattern_detector.cc
@@ -73,7 +73,6 @@ void PDPattern::AddEdge(PDNode* a, PDNode* b) {
 void GraphPatternDetector::operator()(Graph* graph,
                                       GraphPatternDetector::handle_t handler) {
   if (!MarkPDNodesInGraph(*graph)) {
-    LOG(INFO) << "Mark failed";
     return;
   }
 
diff --git a/paddle/fluid/framework/ir/graph_pattern_detector.h b/paddle/fluid/framework/ir/graph_pattern_detector.h
index 9d67c4a6997dfe19561f37bf3ea76eba8b59ff35..eacea1750f6f1e86a8fe79637c3bd757a7275398 100644
--- a/paddle/fluid/framework/ir/graph_pattern_detector.h
+++ b/paddle/fluid/framework/ir/graph_pattern_detector.h
@@ -19,6 +19,9 @@
 #endif
 
 #include <numeric>
+#include <string>
+#include <utility>
+#include <vector>
 #include "paddle/fluid/framework/ir/graph.h"
 #include "paddle/fluid/framework/ir/node.h"
 #include "paddle/fluid/inference/analysis/dot.h"
diff --git a/paddle/fluid/inference/analysis/CMakeLists.txt b/paddle/fluid/inference/analysis/CMakeLists.txt
index dadc8a53706fb9edff884dcf6d49168bfef3aa30..f2e18a461fd221252e4a10262a13bc8e942f5988 100644
--- a/paddle/fluid/inference/analysis/CMakeLists.txt
+++ b/paddle/fluid/inference/analysis/CMakeLists.txt
@@ -58,7 +58,7 @@ endif()
 inference_analysis_test(test_analyzer SRCS analyzer_tester.cc
     EXTRA_DEPS paddle_inference_api paddle_fluid_api ir_pass_manager analysis_predictor
     ARGS --infer_ditu_rnn_model=${DITU_INSTALL_DIR}/model
-        --infer_ditu_rnn_data=${DITU_INSTALL_DIR}/data.txt)
+         --infer_ditu_rnn_data=${DITU_INSTALL_DIR}/data.txt)
 
 inference_analysis_test(test_data_flow_graph SRCS data_flow_graph_tester.cc)
 inference_analysis_test(test_data_flow_graph_to_fluid_pass SRCS data_flow_graph_to_fluid_pass_tester.cc)
@@ -74,7 +74,7 @@ inference_analysis_test(test_model_store_pass SRCS model_store_pass_tester.cc)
 set(CHINESE_NER_MODEL_URL "http://paddle-inference-dist.bj.bcebos.com/chinese_ner_model.tar.gz")
 set(CHINESE_NER_DATA_URL "http://paddle-inference-dist.bj.bcebos.com/chinese_ner-data.txt.tar.gz")
 set(CHINESE_NER_INSTALL_DIR "${THIRD_PARTY_PATH}/inference_demo/chinese_ner" CACHE PATH "Chinese ner model and data root." FORCE)
-if (NOT EXISTS ${CHINESE_NER_INSTALL_DIR} AND WITH_TESTING)
+if (NOT EXISTS ${CHINESE_NER_INSTALL_DIR} AND WITH_TESTING AND WITH_INFERENCE)
   inference_download_and_uncompress(${CHINESE_NER_INSTALL_DIR} ${CHINESE_NER_MODEL_URL} "chinese_ner_model.tar.gz")
   inference_download_and_uncompress(${CHINESE_NER_INSTALL_DIR} ${CHINESE_NER_DATA_URL} "chinese_ner-data.txt.tar.gz")
 endif()
@@ -87,7 +87,7 @@ inference_analysis_test(test_analyzer_ner SRCS analyzer_ner_tester.cc
 set(LAC_MODEL_URL "http://paddle-inference-dist.bj.bcebos.com/lac_model.tar.gz")
 set(LAC_DATA_URL "http://paddle-inference-dist.bj.bcebos.com/lac_data.txt.tar.gz")
 set(LAC_INSTALL_DIR "${THIRD_PARTY_PATH}/inference_demo/lac" CACHE PATH "LAC model and data root." FORCE)
-if (NOT EXISTS ${LAC_INSTALL_DIR} AND WITH_TESTING)
+if (NOT EXISTS ${LAC_INSTALL_DIR} AND WITH_TESTING AND WITH_INFERENCE)
     inference_download_and_uncompress(${LAC_INSTALL_DIR} ${LAC_MODEL_URL} "lac_model.tar.gz")
     inference_download_and_uncompress(${LAC_INSTALL_DIR} ${LAC_DATA_URL} "lac_data.txt.tar.gz")
 endif()
@@ -96,3 +96,15 @@ inference_analysis_test(test_analyzer_lac SRCS analyzer_lac_tester.cc
     EXTRA_DEPS paddle_inference_api paddle_fluid_api
     ARGS --infer_model=${LAC_INSTALL_DIR}/model
         --infer_data=${LAC_INSTALL_DIR}/data.txt)
+
+
+set(TEXT_CLASSIFICATION_MODEL_URL "http://paddle-inference-dist.bj.bcebos.com/text-classification-Senta.tar.gz")
+set(TEXT_CLASSIFICATION_INSTALL_DIR "${THIRD_PARTY_PATH}/inference_demo/text_classification" CACHE PATH "Text Classification model and data root." FORCE)
+
+if (NOT EXISTS ${TEXT_CLASSIFICATION_INSTALL_DIR} AND WITH_TESTING AND WITH_INFERENCE)
+  inference_download_and_uncompress(${TEXT_CLASSIFICATION_INSTALL_DIR} ${TEXT_CLASSIFICATION_MODEL_URL} "text-classification-Senta.tar.gz")
+endif()
+
+inference_analysis_test(test_text_classification SRCS test_text_classification.cc
+    EXTRA_DEPS paddle_inference_api paddle_fluid_api analysis_predictor
+    ARGS --infer_model=${TEXT_CLASSIFICATION_INSTALL_DIR}/text-classification-Senta)
diff --git a/paddle/fluid/inference/analysis/analyzer.cc b/paddle/fluid/inference/analysis/analyzer.cc
index c95bf3597ab62716ec0ca96d4a4852dfc30f8d70..1fd884435d173800563ea37809003ed3aee16c7c 100644
--- a/paddle/fluid/inference/analysis/analyzer.cc
+++ b/paddle/fluid/inference/analysis/analyzer.cc
@@ -42,20 +42,16 @@ class DfgPassManagerImpl final : public DfgPassManager {
  public:
   DfgPassManagerImpl() {
     // TODO(Superjomn) set the key with pass reprs.
-    VLOG(3)
-        << "-----------------------------------------------------------------";
-    if (FLAGS_IA_enable_ir) {
-      AddPass("fluid-to-ir-pass", new FluidToIrPass);
-    } else {
+    if (!FLAGS_IA_enable_ir) {
       AddPass("fluid-to-data-flow-graph", new FluidToDataFlowGraphPass);
+    } else {
+      AddPass("fluid-to-ir-pass", new FluidToIrPass);
     }
     TryAddTensorRtPass();
     AddPass("data-flow-graph-to-fluid", new DataFlowGraphToFluidPass);
     if (!FLAGS_IA_output_storage_path.empty()) {
       AddPass("model-store-pass", new ModelStorePass);
     }
-    VLOG(3)
-        << "-----------------------------------------------------------------";
   }
 
   std::string repr() const override { return "dfg-pass-manager"; }
@@ -102,18 +98,15 @@ class DfgPassManagerImpl final : public DfgPassManager {
 Analyzer::Analyzer() { Register("manager1", new DfgPassManagerImpl); }
 
 void Analyzer::Run(Argument* argument) {
-  // Ugly support fluid-to-ir-pass
-  argument->Set(kFluidToIrPassesAttr,
-                new std::vector<std::string>({
-                    // Manual update the passes here.
-                    "graph_viz_pass",                              //
-                    "infer_clean_graph_pass", "graph_viz_pass",    //
-                    "attention_lstm_fuse_pass", "graph_viz_pass",  //
-                    "fc_lstm_fuse_pass", "graph_viz_pass",         //
-                    "mul_lstm_fuse_pass", "graph_viz_pass",        //
-                    "seq_concat_fc_fuse_pass", "graph_viz_pass",   //
-                    "fc_fuse_pass", "graph_viz_pass"               //
-                }));
+  std::vector<std::string> passes;
+  for (auto& pass : all_ir_passes_) {
+    if (!disabled_ir_passes_.count(pass)) {
+      passes.push_back(pass);
+      passes.push_back("graph_viz_pass");  // add graphviz for debug.
+    }
+  }
+  passes.push_back("graph_viz_pass");
+  argument->Set(kFluidToIrPassesAttr, new std::vector<std::string>(passes));
 
   for (auto& x : data_) {
     PADDLE_ENFORCE(x->Initialize(argument));
@@ -122,6 +115,11 @@ void Analyzer::Run(Argument* argument) {
   }
 }
 
+Analyzer& Analyzer::DisableIrPasses(const std::vector<std::string>& passes) {
+  disabled_ir_passes_.insert(passes.begin(), passes.end());
+  return *this;
+}
+
 }  // namespace analysis
 }  // namespace inference
 }  // namespace paddle
diff --git a/paddle/fluid/inference/analysis/analyzer.h b/paddle/fluid/inference/analysis/analyzer.h
index 2e107c82dd50d5cf22797f4c82e69d302514f955..3fdd2b9ec7537c891a04efb3ca9a1d45075ffa5e 100644
--- a/paddle/fluid/inference/analysis/analyzer.h
+++ b/paddle/fluid/inference/analysis/analyzer.h
@@ -36,16 +36,10 @@ limitations under the License. */
  */
 
 #include <gflags/gflags.h>
+#include "paddle/fluid/inference/analysis/flags.h"
 #include "paddle/fluid/inference/analysis/pass.h"
 #include "paddle/fluid/inference/analysis/pass_manager.h"
 
-// TODO(Superjomn) add a definition flag like PADDLE_WITH_TENSORRT and hide this
-// flag if not available.
-DECLARE_bool(IA_enable_tensorrt_subgraph_engine);
-DECLARE_string(IA_graphviz_log_root);
-DECLARE_string(IA_output_storage_path);
-DECLARE_bool(IA_enable_ir);
-
 namespace paddle {
 namespace inference {
 namespace analysis {
@@ -57,7 +51,26 @@ class Analyzer : public OrderedRegistry<PassManager> {
 
   void Run(Argument* argument);
 
+  Analyzer& DisableIrPasses(const std::vector<std::string>& passes);
+
   DISABLE_COPY_AND_ASSIGN(Analyzer);
+
+ private:
+  // All avaiable IR passes.
+  // The bigger fuse comes first, so that the small operators prefer to be
+  // merged in a larger fuse op. The small fusion will not break the pattern of
+  // larger fusion.
+  const std::vector<std::string> all_ir_passes_{{
+      // Manual update the passes here.
+      "infer_clean_graph_pass",    //
+      "attention_lstm_fuse_pass",  //
+      "fc_lstm_fuse_pass",         //
+      "mul_lstm_fuse_pass",        //
+      "seq_concat_fc_fuse_pass",   //
+      "fc_fuse_pass",              //
+  }};
+
+  std::unordered_set<std::string> disabled_ir_passes_;
 };
 
 }  // namespace analysis
diff --git a/paddle/fluid/inference/analysis/analyzer_tester.cc b/paddle/fluid/inference/analysis/analyzer_tester.cc
index d19ae257746d75c29165a5f973870ecc83c5ccb1..29c86bf787bea4f5ab1f647295e40ff7deabc84e 100644
--- a/paddle/fluid/inference/analysis/analyzer_tester.cc
+++ b/paddle/fluid/inference/analysis/analyzer_tester.cc
@@ -257,19 +257,24 @@ void CompareResult(const std::vector<PaddleTensor> &outputs,
 // Test with a really complicate model.
 void TestDituRNNPrediction(bool use_analysis_and_activate_ir = false,
                            int num_threads = FLAGS_num_threads) {
-  NativeConfig config;
+  AnalysisConfig config;
   config.prog_file = FLAGS_infer_ditu_rnn_model + "/__model__";
   config.param_file = FLAGS_infer_ditu_rnn_model + "/param";
   config.use_gpu = false;
   config.device = 0;
   config.specify_input_name = true;
+  config.enable_ir_optim = activate_ir;
+  PADDLE_ENFORCE(config.ir_mode ==
+                 AnalysisConfig::IrPassMode::kExclude);  // default
+  config.ir_passes.clear();  // Do not exclude any pass.
   int batch_size = FLAGS_batch_size;
   int num_times = FLAGS_repeat;
 
   auto base_predictor =
       CreatePaddlePredictor<NativeConfig, PaddleEngineKind::kNative>(config);
   auto predictor =
-      CreatePaddlePredictor<NativeConfig, PaddleEngineKind::kAnalysis>(config);
+      CreatePaddlePredictor<AnalysisConfig, PaddleEngineKind::kAnalysis>(
+          config);
   std::vector<PaddleTensor> input_slots;
   DataRecord data(FLAGS_infer_ditu_rnn_data, batch_size);
   // Prepare inputs.
diff --git a/paddle/fluid/inference/analysis/flags.h b/paddle/fluid/inference/analysis/flags.h
new file mode 100644
index 0000000000000000000000000000000000000000..717e543f01dfa071865a5c14c0b7679e65239daf
--- /dev/null
+++ b/paddle/fluid/inference/analysis/flags.h
@@ -0,0 +1,22 @@
+// 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 <gflags/gflags.h>
+
+// TODO(Superjomn) add a definition flag like PADDLE_WITH_TENSORRT and hide this
+// flag if not available.
+DECLARE_bool(IA_enable_tensorrt_subgraph_engine);
+DECLARE_string(IA_graphviz_log_root);
+DECLARE_string(IA_output_storage_path);
+DECLARE_bool(IA_enable_ir);
diff --git a/paddle/fluid/inference/analysis/fluid_to_ir_pass.h b/paddle/fluid/inference/analysis/fluid_to_ir_pass.h
index 6731b1f759363eec5dd8645783212a72ace67b2f..3086085710d6e850ed27e82d2323690dfdd3ef19 100644
--- a/paddle/fluid/inference/analysis/fluid_to_ir_pass.h
+++ b/paddle/fluid/inference/analysis/fluid_to_ir_pass.h
@@ -15,6 +15,7 @@
 #pragma once
 
 #include "paddle/fluid/framework/ir/fuse_pass_base.h"
+#include "paddle/fluid/inference/analysis/flags.h"
 #include "paddle/fluid/inference/analysis/ir_pass_manager.h"
 #include "paddle/fluid/inference/analysis/pass.h"
 
@@ -85,9 +86,11 @@ class FluidToIrPass final : public DataFlowGraphPass {
           new Scope *(&argument_->Get<Scope>(ir::kParamScopeAttr)));
     }
 
-    const auto &ir_passes_to_apply =
-        argument_->Get<std::vector<std::string>>(kFluidToIrPassesAttr);
-    ir_passes.Apply(ir_passes_to_apply);
+    if (FLAGS_IA_enable_ir) {
+      const auto &ir_passes_to_apply =
+          argument_->Get<std::vector<std::string>>(kFluidToIrPassesAttr);
+      ir_passes.Apply(ir_passes_to_apply);
+    }
 
     PADDLE_ENFORCE(argument_->main_dfg.get());
     argument_->main_dfg->Build(ir_passes.graph());
diff --git a/paddle/fluid/inference/analysis/test_text_classification.cc b/paddle/fluid/inference/analysis/test_text_classification.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2913824f62301795aea967c22021b2af11f343c1
--- /dev/null
+++ b/paddle/fluid/inference/analysis/test_text_classification.cc
@@ -0,0 +1,109 @@
+// 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 <gflags/gflags.h>
+#include <glog/logging.h>  // use glog instead of PADDLE_ENFORCE to avoid importing other paddle header files.
+#include <gtest/gtest.h>
+#include "paddle/fluid/framework/ir/pass.h"
+#include "paddle/fluid/inference/analysis/analyzer.h"
+#include "paddle/fluid/inference/analysis/ut_helper.h"
+#include "paddle/fluid/inference/api/paddle_inference_api.h"
+#include "paddle/fluid/inference/api/timer.h"
+
+DEFINE_string(infer_model, "", "Directory of the inference model.");
+DEFINE_string(infer_data, "", "Path of the dataset.");
+DEFINE_int32(batch_size, 1, "batch size.");
+DEFINE_int32(repeat, 1, "How many times to repeat run.");
+
+namespace paddle {
+
+template <typename T>
+std::string to_string(const std::vector<T> &vec) {
+  std::stringstream ss;
+  for (const auto &c : vec) {
+    ss << c << " ";
+  }
+  return ss.str();
+}
+
+void PrintTime(const double latency, const int bs, const int repeat) {
+  LOG(INFO) << "===========profile result===========";
+  LOG(INFO) << "batch_size: " << bs << ", repeat: " << repeat
+            << ", avg latency: " << latency / repeat << "ms";
+  LOG(INFO) << "=====================================";
+}
+
+void Main(int batch_size) {
+  // Three sequence inputs.
+  std::vector<PaddleTensor> input_slots(1);
+  // one batch starts
+  // data --
+  int64_t data0[] = {0, 1, 2};
+  for (auto &input : input_slots) {
+    input.data.Reset(data0, sizeof(data0));
+    input.shape = std::vector<int>({3, 1});
+    // dtype --
+    input.dtype = PaddleDType::INT64;
+    // LoD --
+    input.lod = std::vector<std::vector<size_t>>({{0, 3}});
+  }
+
+  // shape --
+  // Create Predictor --
+  AnalysisConfig config;
+  config.model_dir = FLAGS_infer_model;
+  config.use_gpu = false;
+  config.enable_ir_optim = true;
+  config.ir_passes.push_back("fc_lstm_fuse_pass");
+  auto predictor =
+      CreatePaddlePredictor<AnalysisConfig, PaddleEngineKind::kAnalysis>(
+          config);
+
+  inference::Timer timer;
+  double sum = 0;
+  std::vector<PaddleTensor> output_slots;
+  for (int i = 0; i < FLAGS_repeat; i++) {
+    timer.tic();
+    CHECK(predictor->Run(input_slots, &output_slots));
+    sum += timer.toc();
+  }
+  PrintTime(sum, batch_size, FLAGS_repeat);
+
+  // Get output
+  LOG(INFO) << "get outputs " << output_slots.size();
+
+  for (auto &output : output_slots) {
+    LOG(INFO) << "output.shape: " << to_string(output.shape);
+    // no lod ?
+    CHECK_EQ(output.lod.size(), 0UL);
+    LOG(INFO) << "output.dtype: " << output.dtype;
+    std::stringstream ss;
+    for (int i = 0; i < 5; i++) {
+      ss << static_cast<float *>(output.data.data())[i] << " ";
+    }
+    LOG(INFO) << "output.data summary: " << ss.str();
+    // one batch ends
+  }
+}
+
+TEST(text_classification, basic) { Main(FLAGS_batch_size); }
+
+}  // namespace paddle
+
+USE_PASS(fc_fuse_pass);
+USE_PASS(seq_concat_fc_fuse_pass);
+USE_PASS(fc_lstm_fuse_pass);
+USE_PASS(graph_viz_pass);
+USE_PASS(infer_clean_graph_pass);
+USE_PASS(attention_lstm_fuse_pass);
diff --git a/paddle/fluid/inference/api/CMakeLists.txt b/paddle/fluid/inference/api/CMakeLists.txt
index 3a43c72e33b3d5d8910b554021bb1c6a626edd93..ea00bf364951b0a4304b380df492d00e84451136 100644
--- a/paddle/fluid/inference/api/CMakeLists.txt
+++ b/paddle/fluid/inference/api/CMakeLists.txt
@@ -44,7 +44,19 @@ function(inference_api_test TARGET_NAME)
 endfunction(inference_api_test)
 
 cc_library(paddle_inference_api SRCS api.cc api_impl.cc helper.cc DEPS lod_tensor)
-cc_library(analysis_predictor SRCS analysis_predictor.cc DEPS paddle_inference_api)
+cc_library(analysis_predictor SRCS analysis_predictor.cc DEPS paddle_inference_api
+          analysis
+          ir_pass_manager
+          pass
+          fc_fuse_pass
+          fc_lstm_fuse_pass
+          seq_concat_fc_fuse_pass
+          graph_viz_pass
+          infer_clean_graph_pass
+          graph_pattern_detector
+          infer_clean_graph_pass
+          attention_lstm_fuse_pass
+  )
 
 cc_test(test_paddle_inference_api
         SRCS api_tester.cc
diff --git a/paddle/fluid/inference/api/analysis_predictor.cc b/paddle/fluid/inference/api/analysis_predictor.cc
index 90779d3e5aa59bedbb44d27c08c8bf4b77942cea..79eeea88ea83ad862b5e2ac1390dae377b676685 100644
--- a/paddle/fluid/inference/api/analysis_predictor.cc
+++ b/paddle/fluid/inference/api/analysis_predictor.cc
@@ -30,6 +30,8 @@ bool AnalysisPredictor::Init(
   VLOG(3) << "Predictor::init()";
   if (config_.use_gpu) {
     place_ = paddle::platform::CUDAPlace(config_.device);
+    LOG(WARNING) << "ir optimize only supports CPU currently";
+    config_.enable_ir_optim = false;
   } else {
     place_ = paddle::platform::CPUPlace();
   }
@@ -74,7 +76,7 @@ bool AnalysisPredictor::Init(
 
 void AnalysisPredictor::OptimizeInferenceProgram() {
   LOG(INFO) << "optimize begin";
-  FLAGS_IA_enable_ir = true;
+  FLAGS_IA_enable_ir = config_.enable_ir_optim;
   FLAGS_IA_enable_tensorrt_subgraph_engine = false;
   FLAGS_IA_output_storage_path = "";  // Don't output the model.
   // Analyze inference_program
@@ -91,22 +93,26 @@ void AnalysisPredictor::OptimizeInferenceProgram() {
   }
   argument_.origin_program_desc.reset(
       new ProgramDesc(*inference_program_->Proto()));
-  Analyzer().Run(&argument_);
+  PADDLE_ENFORCE(config_.ir_mode == AnalysisConfig::IrPassMode::kExclude,
+                 "Only kExclude is supported yet.");
+  Analyzer().DisableIrPasses(config_.ir_passes).Run(&argument_);
+
   CHECK(argument_.transformed_program_desc);
   VLOG(5) << "to prepare executor";
   inference_program_.reset(
       new framework::ProgramDesc(*argument_.transformed_program_desc));
-  PADDLE_ENFORCE(argument_.Has(framework::ir::kParamScopeAttr));
-  // Update scope.
-  scope_.reset(
-      argument_.Release<framework::Scope>(framework::ir::kParamScopeAttr));
-  LOG(INFO) << "optimize end ==";
+  if (argument_.Has(framework::ir::kParamScopeAttr)) {
+    // Update scope.
+    scope_.reset(
+        argument_.Release<framework::Scope>(framework::ir::kParamScopeAttr));
+  }
+  LOG(INFO) << "== optimize end ==";
 }
 
 template <>
 std::unique_ptr<PaddlePredictor> CreatePaddlePredictor<
-    NativeConfig, PaddleEngineKind::kAnalysis>(const NativeConfig& config) {
-  VLOG(3) << "create AnalysisPredictor";
+    AnalysisConfig, PaddleEngineKind::kAnalysis>(const AnalysisConfig& config) {
+  VLOG(3) << "create AnalysisConfig";
   if (config.use_gpu) {
     // 1. GPU memeroy
     PADDLE_ENFORCE_GT(
diff --git a/paddle/fluid/inference/api/analysis_predictor.h b/paddle/fluid/inference/api/analysis_predictor.h
index e32b6185f6044ab3577bde0a8f8dcf2391688aa8..e53925366e9214cd60422efe56884751297c15e5 100644
--- a/paddle/fluid/inference/api/analysis_predictor.h
+++ b/paddle/fluid/inference/api/analysis_predictor.h
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <string>
+#include <vector>
 #include "paddle/fluid/inference/analysis/analyzer.h"
 #include "paddle/fluid/inference/api/api_impl.h"
 #include "paddle/fluid/inference/api/paddle_inference_api.h"
@@ -28,7 +30,7 @@ using framework::proto::ProgramDesc;
  */
 class AnalysisPredictor : public NativePaddlePredictor {
  public:
-  explicit AnalysisPredictor(const NativeConfig& config)
+  explicit AnalysisPredictor(const AnalysisConfig& config)
       : NativePaddlePredictor(config), config_(config) {}
 
   bool Init(const std::shared_ptr<framework::Scope>& parent_scope);
@@ -44,7 +46,7 @@ class AnalysisPredictor : public NativePaddlePredictor {
   Argument& analysis_argument() { return argument_; }
 
  private:
-  NativeConfig config_;
+  AnalysisConfig config_;
   Argument argument_;
 };
 
diff --git a/paddle/fluid/inference/api/api_impl.cc b/paddle/fluid/inference/api/api_impl.cc
index 38b11d9113e4b03f8365b969009f7a385a683a70..bd9b4b1a814f995e3979105f5b9830b95fd8ea7d 100644
--- a/paddle/fluid/inference/api/api_impl.cc
+++ b/paddle/fluid/inference/api/api_impl.cc
@@ -176,7 +176,8 @@ bool NativePaddlePredictor::SetFeed(const std::vector<PaddleTensor> &inputs,
                                     framework::Scope *scope) {
   VLOG(3) << "Predictor::set_feed";
   if (inputs.size() != feeds_.size()) {
-    LOG(ERROR) << "wrong feed input size.";
+    LOG(ERROR) << "wrong feed input size, need " << feeds_.size() << " but get "
+               << inputs.size();
     return false;
   }
   for (size_t i = 0; i < inputs.size(); ++i) {
diff --git a/paddle/fluid/inference/api/paddle_inference_api.h b/paddle/fluid/inference/api/paddle_inference_api.h
index 1baa64c249f291ec1bc874be5031abe6d4368274..995da11e4a30eca72a91a53d3293aa8b033b012b 100644
--- a/paddle/fluid/inference/api/paddle_inference_api.h
+++ b/paddle/fluid/inference/api/paddle_inference_api.h
@@ -150,6 +150,21 @@ struct TensorRTConfig : public NativeConfig {
   int workspace_size{1 << 30};
 };
 
+// NOTE WIP, not stable yet.
+struct AnalysisConfig : public NativeConfig {
+  //
+  enum class IrPassMode {
+    kSystem,   // Use system default passes, not customize.
+    kInclude,  // Specify the passes in `ir_passes`.
+    kExclude   // Specify the disabled passes in `ir_passes`.
+  };
+
+  bool enable_ir_optim = true;
+  IrPassMode ir_mode{IrPassMode::kExclude};
+  // attention lstm fuse works only on some specific models, disable as default.
+  std::vector<std::string> ir_passes{"attention_lstm_fuse_pass"};
+};
+
 // A factory to help create different predictors.
 //
 // FOR EXTENSION DEVELOPER:
diff --git a/paddle/fluid/operators/auc_op.cc b/paddle/fluid/operators/auc_op.cc
index 5edecd18e673da326ec119cf9a383f24f8045089..dfaa7456f917c1308984b361afed752f96ea6f59 100644
--- a/paddle/fluid/operators/auc_op.cc
+++ b/paddle/fluid/operators/auc_op.cc
@@ -13,7 +13,6 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #include "paddle/fluid/operators/auc_op.h"
-#include <string>
 
 namespace paddle {
 namespace operators {
@@ -36,15 +35,12 @@ class AucOp : public framework::OperatorWithKernel {
     PADDLE_ENFORCE_EQ(predict_height, label_height,
                       "Out and Label should have same height.");
 
-    int num_thres = ctx->Attrs().Get<int>("num_thresholds");
+    int num_pred_buckets = ctx->Attrs().Get<int>("num_thresholds") + 1;
 
     ctx->SetOutputDim("AUC", {1});
-    ctx->SetOutputDim("TPOut", {num_thres});
-    ctx->SetOutputDim("TNOut", {num_thres});
-    ctx->SetOutputDim("FPOut", {num_thres});
-    ctx->SetOutputDim("FNOut", {num_thres});
-
-    ctx->ShareLoD("Predict", /*->*/ "AUC");
+    ctx->SetOutputDim("BatchAUC", {1});
+    ctx->SetOutputDim("StatPosOut", {num_pred_buckets});
+    ctx->SetOutputDim("StatNegOut", {num_pred_buckets});
   }
 
  protected:
@@ -66,25 +62,24 @@ class AucOpMaker : public framework::OpProtoAndCheckerMaker {
     AddInput("Label",
              "A 2D int tensor indicating the label of the training data. "
              "shape: [batch_size, 1]");
-    AddInput("TP", "True-Positive value.");
-    AddInput("FP", "False-Positive value.");
-    AddInput("TN", "True-Negative value.");
-    AddInput("FN", "False-Negative value.");
     // TODO(typhoonzero): support weight input
+    AddInput("StatPos", "Statistic value when label = 1");
+    AddInput("StatNeg", "Statistic value when label = 0");
+
     AddOutput("AUC",
               "A scalar representing the "
               "current area-under-the-curve.");
-    AddOutput("TPOut", "True-Positive value.");
-    AddOutput("FPOut", "False-Positive value.");
-    AddOutput("TNOut", "True-Negative value.");
-    AddOutput("FNOut", "False-Negative value.");
+    AddOutput("BatchAUC", "The AUC for current batch");
+    AddOutput("StatPosOut", "Statistic value when label = 1");
+    AddOutput("StatNegOut", "Statistic value when label = 0");
 
     AddAttr<std::string>("curve", "Curve type, can be 'ROC' or 'PR'.")
         .SetDefault("ROC");
+
     AddAttr<int>("num_thresholds",
                  "The number of thresholds to use when discretizing the"
                  " roc curve.")
-        .SetDefault(200);
+        .SetDefault((2 << 12) - 1);
 
     AddComment(R"DOC(
 Area Under The Curve (AUC) Operator.
diff --git a/paddle/fluid/operators/auc_op.h b/paddle/fluid/operators/auc_op.h
index 0a18585edb54a76aff5ae72ecc71e0eebb9f9361..fb0517d70635e090f8c5b59ff9d8420fc34c747b 100644
--- a/paddle/fluid/operators/auc_op.h
+++ b/paddle/fluid/operators/auc_op.h
@@ -13,9 +13,9 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #pragma once
+
 #include <string>
 #include <vector>
-#include "paddle/fluid/framework/eigen.h"
 #include "paddle/fluid/framework/op_registry.h"
 
 namespace paddle {
@@ -23,106 +23,85 @@ namespace operators {
 
 using Tensor = framework::Tensor;
 
-template <typename T, int MajorType = Eigen::RowMajor,
-          typename IndexType = Eigen::DenseIndex>
-using EigenVector = framework::EigenVector<T, MajorType, IndexType>;
-
 template <typename DeviceContext, typename T>
 class AucKernel : public framework::OpKernel<T> {
  public:
-  void Compute(const framework::ExecutionContext& ctx) const override {
-    auto* predict = ctx.Input<Tensor>("Predict");
-    auto* label = ctx.Input<Tensor>("Label");
-    auto* auc = ctx.Output<Tensor>("AUC");
+  void Compute(const framework::ExecutionContext &ctx) const override {
+    auto *predict = ctx.Input<Tensor>("Predict");
+    auto *label = ctx.Input<Tensor>("Label");
+
+    std::string curve = ctx.Attr<std::string>("curve");
+    int num_thresholds = ctx.Attr<int>("num_thresholds");
+    int num_pred_buckets = num_thresholds + 1;
+
     // Only use output var for now, make sure it's persistable and
     // not cleaned up for each batch.
-    auto* true_positive = ctx.Output<Tensor>("TPOut");
-    auto* false_positive = ctx.Output<Tensor>("FPOut");
-    auto* true_negative = ctx.Output<Tensor>("TNOut");
-    auto* false_negative = ctx.Output<Tensor>("FNOut");
+    auto *auc = ctx.Output<Tensor>("AUC");
+    auto *stat_pos = ctx.Output<Tensor>("StatPosOut");
+    auto *stat_neg = ctx.Output<Tensor>("StatNegOut");
 
-    auto* auc_data = auc->mutable_data<double>(ctx.GetPlace());
+    auto *stat_pos_data = stat_pos->mutable_data<int64_t>(ctx.GetPlace());
+    auto *stat_neg_data = stat_neg->mutable_data<int64_t>(ctx.GetPlace());
+    calcAuc(ctx, label, predict, stat_pos_data, stat_neg_data, num_thresholds,
+            auc);
 
-    std::string curve = ctx.Attr<std::string>("curve");
-    int num_thresholds = ctx.Attr<int>("num_thresholds");
-    std::vector<double> thresholds_list;
-    thresholds_list.reserve(num_thresholds);
-    for (int i = 1; i < num_thresholds - 1; i++) {
-      thresholds_list[i] = static_cast<double>(i) / (num_thresholds - 1);
-    }
-    const double kEpsilon = 1e-7;
-    thresholds_list[0] = 0.0f - kEpsilon;
-    thresholds_list[num_thresholds - 1] = 1.0f + kEpsilon;
+    auto *batch_auc = ctx.Output<Tensor>("BatchAUC");
+    std::vector<int64_t> stat_pos_batch(num_pred_buckets, 0);
+    std::vector<int64_t> stat_neg_batch(num_pred_buckets, 0);
+    calcAuc(ctx, label, predict, stat_pos_batch.data(), stat_neg_batch.data(),
+            num_thresholds, batch_auc);
+  }
 
+ private:
+  inline static double trapezoidArea(double X1, double X2, double Y1,
+                                     double Y2) {
+    return (X1 > X2 ? (X1 - X2) : (X2 - X1)) * (Y1 + Y2) / 2.0;
+  }
+
+  inline static void calcAuc(const framework::ExecutionContext &ctx,
+                             const framework::Tensor *label,
+                             const framework::Tensor *predict,
+                             int64_t *stat_pos, int64_t *stat_neg,
+                             int num_thresholds,
+                             framework::Tensor *auc_tensor) {
     size_t batch_size = predict->dims()[0];
     size_t inference_width = predict->dims()[1];
+    const T *inference_data = predict->data<T>();
+    const auto *label_data = label->data<int64_t>();
+
+    auto *auc = auc_tensor->mutable_data<double>(ctx.GetPlace());
 
-    const T* inference_data = predict->data<T>();
-    const auto* label_data = label->data<int64_t>();
-
-    auto* tp_data = true_positive->mutable_data<int64_t>(ctx.GetPlace());
-    auto* fn_data = false_negative->mutable_data<int64_t>(ctx.GetPlace());
-    auto* tn_data = true_negative->mutable_data<int64_t>(ctx.GetPlace());
-    auto* fp_data = false_positive->mutable_data<int64_t>(ctx.GetPlace());
-
-    for (int idx_thresh = 0; idx_thresh < num_thresholds; idx_thresh++) {
-      // calculate TP, FN, TN, FP for current thresh
-      int64_t tp = 0, fn = 0, tn = 0, fp = 0;
-      for (size_t i = 0; i < batch_size; i++) {
-        // NOTE: label_data used as bool, labels > 0 will be treated as true.
-        if (label_data[i]) {
-          if (inference_data[i * inference_width + 1] >=
-              (thresholds_list[idx_thresh])) {
-            tp++;
-          } else {
-            fn++;
-          }
-        } else {
-          if (inference_data[i * inference_width + 1] >=
-              (thresholds_list[idx_thresh])) {
-            fp++;
-          } else {
-            tn++;
-          }
-        }
+    for (size_t i = 0; i < batch_size; i++) {
+      uint32_t binIdx = static_cast<uint32_t>(
+          inference_data[i * inference_width + 1] * num_thresholds);
+      if (label_data[i]) {
+        stat_pos[binIdx] += 1.0;
+      } else {
+        stat_neg[binIdx] += 1.0;
       }
-      // store rates
-      tp_data[idx_thresh] += tp;
-      fn_data[idx_thresh] += fn;
-      tn_data[idx_thresh] += tn;
-      fp_data[idx_thresh] += fp;
     }
-    // epsilon to avoid divide by zero.
-    double epsilon = 1e-6;
-    // Riemann sum to caculate auc.
-    Tensor tp_rate, fp_rate, rec_rate;
-    tp_rate.Resize({num_thresholds});
-    fp_rate.Resize({num_thresholds});
-    rec_rate.Resize({num_thresholds});
-    auto* tp_rate_data = tp_rate.mutable_data<double>(ctx.GetPlace());
-    auto* fp_rate_data = fp_rate.mutable_data<double>(ctx.GetPlace());
-    auto* rec_rate_data = rec_rate.mutable_data<double>(ctx.GetPlace());
-    for (int i = 0; i < num_thresholds; i++) {
-      tp_rate_data[i] = (static_cast<double>(tp_data[i]) + epsilon) /
-                        (tp_data[i] + fn_data[i] + epsilon);
-      fp_rate_data[i] =
-          static_cast<double>(fp_data[i]) / (fp_data[i] + tn_data[i] + epsilon);
-      rec_rate_data[i] = (static_cast<double>(tp_data[i]) + epsilon) /
-                         (tp_data[i] + fp_data[i] + epsilon);
+
+    *auc = 0.0f;
+
+    double totPos = 0.0;
+    double totNeg = 0.0;
+    double totPosPrev = 0.0;
+    double totNegPrev = 0.0;
+
+    int idx = num_thresholds;
+
+    while (idx >= 0) {
+      totPosPrev = totPos;
+      totNegPrev = totNeg;
+      totPos += stat_pos[idx];
+      totNeg += stat_neg[idx];
+      *auc += trapezoidArea(totNeg, totNegPrev, totPos, totPosPrev);
+
+      --idx;
     }
-    *auc_data = 0.0f;
-    if (curve == "ROC") {
-      for (int i = 0; i < num_thresholds - 1; i++) {
-        auto dx = fp_rate_data[i] - fp_rate_data[i + 1];
-        auto y = (tp_rate_data[i] + tp_rate_data[i + 1]) / 2.0f;
-        *auc_data = *auc_data + dx * y;
-      }
-    } else if (curve == "PR") {
-      for (int i = 1; i < num_thresholds; i++) {
-        auto dx = tp_rate_data[i] - tp_rate_data[i - 1];
-        auto y = (rec_rate_data[i] + rec_rate_data[i - 1]) / 2.0f;
-        *auc_data = *auc_data + dx * y;
-      }
+
+    if (totPos > 0.0 && totNeg > 0.0) {
+      *auc = *auc / totPos / totNeg;
     }
   }
 };
diff --git a/paddle/fluid/operators/lookup_table_op.h b/paddle/fluid/operators/lookup_table_op.h
index f5c10ced8305b64c6386c5051804f8c9a8f71802..58463dc4d6fd7cc3454de766814a947fee161070 100644
--- a/paddle/fluid/operators/lookup_table_op.h
+++ b/paddle/fluid/operators/lookup_table_op.h
@@ -57,7 +57,7 @@ class LookupTableKernel : public framework::OpKernel<T> {
           memset(output + i * row_width, 0, row_width * sizeof(T));
         } else {
           PADDLE_ENFORCE_LT(ids[i], row_number);
-          PADDLE_ENFORCE_GE(ids[i], 0);
+          PADDLE_ENFORCE_GE(ids[i], 0, "ids %d", i);
           memcpy(output + i * row_width, table + ids[i] * row_width,
                  row_width * sizeof(T));
         }
diff --git a/python/paddle/fluid/layers/metric_op.py b/python/paddle/fluid/layers/metric_op.py
index 0182bbeb637ec7b6a341a4822a1cc5fb5aef077d..b1598bfec210474ae1e17f9f88e8b57aa80b8452 100644
--- a/python/paddle/fluid/layers/metric_op.py
+++ b/python/paddle/fluid/layers/metric_op.py
@@ -78,7 +78,7 @@ def accuracy(input, label, k=1, correct=None, total=None):
     return acc_out
 
 
-def auc(input, label, curve='ROC', num_thresholds=200, topk=1):
+def auc(input, label, curve='ROC', num_thresholds=2**12 - 1, topk=1):
     """
     **Area Under the Curve (AUC) Layer**
 
@@ -118,16 +118,14 @@ def auc(input, label, curve='ROC', num_thresholds=200, topk=1):
     """
     helper = LayerHelper("auc", **locals())
     auc_out = helper.create_tmp_variable(dtype="float64")
+    batch_auc_out = helper.create_tmp_variable(dtype="float64")
     # make tp, tn, fp, fn persistable, so that can accumulate all batches.
-    tp = helper.create_global_variable(
-        persistable=True, dtype='int64', shape=[num_thresholds])
-    tn = helper.create_global_variable(
-        persistable=True, dtype='int64', shape=[num_thresholds])
-    fp = helper.create_global_variable(
-        persistable=True, dtype='int64', shape=[num_thresholds])
-    fn = helper.create_global_variable(
-        persistable=True, dtype='int64', shape=[num_thresholds])
-    for var in [tp, tn, fp, fn]:
+    stat_pos = helper.create_global_variable(
+        persistable=True, dtype='int64', shape=[num_thresholds + 1])
+    stat_neg = helper.create_global_variable(
+        persistable=True, dtype='int64', shape=[num_thresholds + 1])
+
+    for var in [stat_pos, stat_neg]:
         helper.set_variable_initializer(
             var, Constant(
                 value=0.0, force_cpu=True))
@@ -137,18 +135,15 @@ def auc(input, label, curve='ROC', num_thresholds=200, topk=1):
         inputs={
             "Predict": [input],
             "Label": [label],
-            "TP": [tp],
-            "TN": [tn],
-            "FP": [fp],
-            "FN": [fn]
+            "StatPos": [stat_pos],
+            "StatNeg": [stat_neg]
         },
         attrs={"curve": curve,
                "num_thresholds": num_thresholds},
         outputs={
             "AUC": [auc_out],
-            "TPOut": [tp],
-            "TNOut": [tn],
-            "FPOut": [fp],
-            "FNOut": [fn]
+            "BatchAUC": [batch_auc_out],
+            "StatPosOut": [stat_pos],
+            "StatNegOut": [stat_neg]
         })
-    return auc_out, [tp, tn, fp, fn]
+    return auc_out, batch_auc_out, [stat_pos, stat_neg]
diff --git a/python/paddle/fluid/metrics.py b/python/paddle/fluid/metrics.py
index 592cb23eb9319658f8542ed5bc6ab3e95cfdb118..0c2800dcf35ed156b71625babea2724f520575e5 100644
--- a/python/paddle/fluid/metrics.py
+++ b/python/paddle/fluid/metrics.py
@@ -558,8 +558,6 @@ class Auc(MetricBase):
         name: metric name
         curve: Specifies the name of the curve to be computed, 'ROC' [default] or
           'PR' for the Precision-Recall-curve.
-        num_thresholds: The number of thresholds to use when discretizing the roc
-            curve.
 
     "NOTE: only implement the ROC curve type via Python now."
 
@@ -574,15 +572,14 @@ class Auc(MetricBase):
                 numpy_auc = metric.eval()
     """
 
-    def __init__(self, name, curve='ROC', num_thresholds=200):
+    def __init__(self, name, curve='ROC', num_thresholds=4095):
         super(Auc, self).__init__(name=name)
         self._curve = curve
         self._num_thresholds = num_thresholds
-        self._epsilon = 1e-6
-        self.tp_list = np.zeros((num_thresholds, ))
-        self.fn_list = np.zeros((num_thresholds, ))
-        self.tn_list = np.zeros((num_thresholds, ))
-        self.fp_list = np.zeros((num_thresholds, ))
+
+        _num_pred_buckets = num_thresholds + 1
+        self._stat_pos = [0] * _num_pred_buckets
+        self._stat_neg = [0] * _num_pred_buckets
 
     def update(self, preds, labels):
         if not _is_numpy_(labels):
@@ -590,41 +587,32 @@ class Auc(MetricBase):
         if not _is_numpy_(preds):
             raise ValueError("The 'predictions' must be a numpy ndarray.")
 
-        kepsilon = 1e-7  # to account for floating point imprecisions
-        thresholds = [(i + 1) * 1.0 / (self._num_thresholds - 1)
-                      for i in range(self._num_thresholds - 2)]
-        thresholds = [0.0 - kepsilon] + thresholds + [1.0 + kepsilon]
-
-        # calculate TP, FN, TN, FP count
-        for idx_thresh, thresh in enumerate(thresholds):
-            tp, fn, tn, fp = 0, 0, 0, 0
-            for i, lbl in enumerate(labels):
-                if lbl:
-                    if preds[i, 1] >= thresh:
-                        tp += 1
-                    else:
-                        fn += 1
-                else:
-                    if preds[i, 1] >= thresh:
-                        fp += 1
-                    else:
-                        tn += 1
-            self.tp_list[idx_thresh] += tp
-            self.fn_list[idx_thresh] += fn
-            self.tn_list[idx_thresh] += tn
-            self.fp_list[idx_thresh] += fp
+        for i, lbl in enumerate(labels):
+            value = preds[i, 1]
+            bin_idx = int(value * self._num_thresholds)
+            assert bin_idx <= self._num_thresholds
+            if lbl:
+                self._stat_pos[bin_idx] += 1.0
+            else:
+                self._stat_neg[bin_idx] += 1.0
+
+    @staticmethod
+    def trapezoid_area(x1, x2, y1, y2):
+        return abs(x1 - x2) * (y1 + y2) / 2.0
 
     def eval(self):
-        epsilon = self._epsilon
-        num_thresholds = self._num_thresholds
-        tpr = (self.tp_list.astype("float32") + epsilon) / (
-            self.tp_list + self.fn_list + epsilon)
-        fpr = self.fp_list.astype("float32") / (
-            self.fp_list + self.tn_list + epsilon)
-        rec = (self.tp_list.astype("float32") + epsilon) / (
-            self.tp_list + self.fp_list + epsilon)
-
-        x = fpr[:num_thresholds - 1] - fpr[1:]
-        y = (tpr[:num_thresholds - 1] + tpr[1:]) / 2.0
-        auc_value = np.sum(x * y)
-        return auc_value
+        tot_pos = 0.0
+        tot_neg = 0.0
+        auc = 0.0
+
+        idx = self._num_thresholds
+        while idx >= 0:
+            tot_pos_prev = tot_pos
+            tot_neg_prev = tot_neg
+            tot_pos += self._stat_pos[idx]
+            tot_neg += self._stat_neg[idx]
+            auc += self.trapezoid_area(tot_neg, tot_neg_prev, tot_pos,
+                                       tot_pos_prev)
+            idx -= 1
+
+        return auc / tot_pos / tot_neg if tot_pos > 0.0 and tot_neg > 0.0 else 0.0
diff --git a/python/paddle/fluid/tests/unittests/test_auc_op.py b/python/paddle/fluid/tests/unittests/test_auc_op.py
index 5393a17e674a3cad6d705a1ff7a45320e644af94..1de4a9d016a177944253d12094722d3a05614be2 100644
--- a/python/paddle/fluid/tests/unittests/test_auc_op.py
+++ b/python/paddle/fluid/tests/unittests/test_auc_op.py
@@ -26,18 +26,15 @@ class TestAucOp(OpTest):
         pred = np.random.random((128, 2)).astype("float32")
         labels = np.random.randint(0, 2, (128, 1))
         num_thresholds = 200
-        tp = np.zeros((num_thresholds, )).astype("int64")
-        tn = np.zeros((num_thresholds, )).astype("int64")
-        fp = np.zeros((num_thresholds, )).astype("int64")
-        fn = np.zeros((num_thresholds, )).astype("int64")
+
+        stat_pos = np.zeros((num_thresholds + 1, )).astype("int64")
+        stat_neg = np.zeros((num_thresholds + 1, )).astype("int64")
 
         self.inputs = {
             'Predict': pred,
             'Label': labels,
-            'TP': tp,
-            'TN': tn,
-            'FP': fp,
-            'FN': fn
+            "StatPos": stat_pos,
+            "StatNeg": stat_neg
         }
         self.attrs = {'curve': 'ROC', 'num_thresholds': num_thresholds}
 
@@ -47,11 +44,10 @@ class TestAucOp(OpTest):
         python_auc.update(pred, labels)
 
         self.outputs = {
-            'AUC': python_auc.eval(),
-            'TPOut': python_auc.tp_list,
-            'FNOut': python_auc.fn_list,
-            'TNOut': python_auc.tn_list,
-            'FPOut': python_auc.fp_list
+            'AUC': np.array(python_auc.eval()),
+            'BatchAUC': np.array(python_auc.eval()),
+            'StatPosOut': np.array(python_auc._stat_pos),
+            'StatNegOut': np.array(python_auc._stat_neg)
         }
 
     def test_check_output(self):