Optimize selected rows for dist lookup table with pthread rwlock (#12635)

Optimize selected rows for dist lookup table with rwlock 

paddle/fluid/framework/rw_lock.h

+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+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 <pthread.h>
+
+namespace paddle {
+namespace framework {
+
+struct RWLock {
+  RWLock() { pthread_rwlock_init(&lock_, nullptr); }
+
+  ~RWLock() { pthread_rwlock_destroy(&lock_); }
+
+  void RDLock() {
+    PADDLE_ENFORCE_EQ(pthread_rwlock_rdlock(&lock_), 0,
+                      "acquire read lock failed");
+  }
+
+  void WRLock() {
+    PADDLE_ENFORCE_EQ(pthread_rwlock_wrlock(&lock_), 0,
+                      "acquire write lock failed");
+  }
+
+  void UNLock() {
+    PADDLE_ENFORCE_EQ(pthread_rwlock_unlock(&lock_), 0, "unlock failed");
+  }
+
+ private:
+  pthread_rwlock_t lock_;
+};
+
+}  // namespace framework
+}  // namespace paddle

paddle/fluid/framework/selected_rows.cc

@@ -120,66 +120,76 @@ bool SelectedRows::HasKey(int64_t key) const {
                                                                    : true;
 }
 
-std::vector<std::pair<int64_t, int64_t>> SelectedRows::Get(
-    const std::vector<int64_t>& keys, framework::Tensor* value) const {
+int64_t SelectedRows::AutoGrownIndex(int64_t key, bool auto_grown) {
+  rwlock_->RDLock();
+  auto iter = id_to_index_.find(key);
+  if (iter == id_to_index_.end()) {
+    rwlock_->UNLock();
+    if (!auto_grown) {
+      PADDLE_THROW("key %d not found", key);
+    }
+    rwlock_->WRLock();
+    auto map_size = id_to_index_.size();
+    auto vector_size = rows_.size();
+    if (map_size != vector_size) {
+      rwlock_->UNLock();
+      PADDLE_THROW(
+          "id_to_index_ size %d should have the same size with rows_ %d",
+          map_size, vector_size);
+    }
+    auto write_iter = id_to_index_.find(key);
+    if (write_iter == id_to_index_.end()) {
+      size_t row_num = rows_.size();
+      if (row_num == value_->dims()[0]) {
+        rwlock_->UNLock();
+        PADDLE_THROW("selected rows is full, then length exceed %d", row_num);
+      }
+      // key logic to put a key into id_to_index_
+      rows_.push_back(key);
+      auto index = static_cast<int64_t>(rows_.size() - 1);
+      id_to_index_[key] = index;
+      rwlock_->UNLock();
+      return index;
+    } else {
+      auto index = write_iter->second;
+      rwlock_->UNLock();
+      return index;
+    }
+  } else {
+    auto index = iter->second;
+    rwlock_->UNLock();
+    return index;
+  }
+}
+
+void SelectedRows::SyncIndex() {
+  rwlock_->WRLock();
+  id_to_index_.clear();
+  for (size_t i = 0; i < rows_.size(); ++i) {
+    id_to_index_[rows_[i]] = i;
+  }
+  rwlock_->UNLock();
+}
+
+void SelectedRows::Get(const framework::Tensor& ids, framework::Tensor* value,
+                       bool auto_grown) {
   PADDLE_ENFORCE(value->IsInitialized(),
                  "The value tensor should be initialized.");
-  std::vector<std::pair<int64_t, int64_t>> non_keys_pair;
-  if (keys.empty()) {
+  if (ids.numel() == 0) {
     VLOG(3) << "keys is empty, please check data!";
   } else {
     int64_t value_width = value_->numel() / value_->dims()[0];
     PADDLE_ENFORCE_EQ(value_width, value->numel() / value->dims()[0],
                       "output tensor should have the same shape with table "
                       "except the dims[0].");
-
-    for (size_t i = 0; i < keys.size(); ++i) {
-      int64_t index = Index(keys[i]);
-      if (index == -1) {
-        non_keys_pair.push_back(
-            std::make_pair(keys[i], static_cast<int64_t>(i)));
-      } else {
-        framework::VisitDataType(
-            framework::ToDataType(value_->type()),
-            TensorCopyVisitor(value, i * value_width, *value_.get(),
-                              index * value_width, value_width));
-      }
+    for (size_t i = 0; i < ids.numel(); ++i) {
+      int64_t index = AutoGrownIndex(ids.data<int64_t>()[i], auto_grown);
+      framework::VisitDataType(
+          framework::ToDataType(value_->type()),
+          TensorCopyVisitor(value, i * value_width, *value_.get(),
+                            index * value_width, value_width));
     }
   }
-  return non_keys_pair;
-}
-
-bool SelectedRows::Set(int64_t key, const framework::Tensor& value) {
-  PADDLE_ENFORCE(value.IsInitialized(), "The value should be initialized.");
-  if (value_->IsInitialized()) {
-    PADDLE_ENFORCE_EQ(
-        value.type(), value_->type(),
-        "The type of the value should be same with the original value");
-  }
-  PADDLE_ENFORCE_EQ(value.dims()[0], static_cast<size_t>(1),
-                    "The first dim of value should be 1.");
-  std::lock_guard<std::mutex> lock(*auto_grown_mutex_.get());
-  auto index = Index(key);
-  bool is_new_key = false;
-  if (index == -1) {
-    rows_.push_back(key);
-    index = rows_.size() - 1;
-    is_new_key = true;
-    // whether need to resize the table
-    if (static_cast<int64_t>(rows_.size()) > value_->dims()[0]) {
-      auto dims = value_->dims();
-      dims[0] = (dims[0] + 1) << 1;
-      framework::VisitDataType(framework::ToDataType(value.type()),
-                               ReAllocateVisitor(dims, value_.get()));
-    }
-  }
-
-  framework::VisitDataType(
-      framework::ToDataType(value.type()),
-      TensorCopyVisitor(value_.get(),
-                        index * value_->numel() / value_->dims()[0], value,
-                        static_cast<int64_t>(0), value.numel()));
-  return is_new_key;
 }
 
 }  // namespace framework

paddle/fluid/framework/selected_rows.h

@@ -17,10 +17,12 @@ limitations under the License. */
 #include <algorithm>
 #include <memory>
 #include <mutex>  // NOLINT
+#include <unordered_map>
 #include <utility>
 #include <vector>
 
 #include "paddle/fluid/framework/lod_tensor.h"
+#include "paddle/fluid/framework/rw_lock.h"
 #include "paddle/fluid/framework/tensor.h"
 #include "paddle/fluid/memory/memcpy.h"
 
@@ -48,13 +50,13 @@ class SelectedRows {
   SelectedRows(const std::vector<int64_t>& rows, const int64_t& height)
       : rows_(rows), height_(height) {
     value_.reset(new Tensor());
-    auto_grown_mutex_.reset(new std::mutex);
+    rwlock_.reset(new RWLock);
   }
 
   SelectedRows() {
     height_ = 0;
     value_.reset(new Tensor());
-    auto_grown_mutex_.reset(new std::mutex);
+    rwlock_.reset(new RWLock);
   }
 
   platform::Place place() const { return value_->place(); }
@@ -74,47 +76,51 @@ class SelectedRows {
   void set_rows(const Vector<int64_t>& rows) { rows_ = rows; }
 
   /*
-   * @brief wheter has the specified key in the table.
+   * @brief Get the index of key in rows
+   *
+   * @return -1 if the key does not exists.
+   */
+  int64_t Index(int64_t key) const {
+    auto it = std::find(rows_.begin(), rows_.end(), key);
+    if (it == rows_.end()) {
+      PADDLE_THROW("id %s not in table", key);
+    }
+    return static_cast<int64_t>(std::distance(rows_.begin(), it));
+  }
+
+  /*
+   * @brief whether has the specified key in the table.
    *
    * @return true if the key is exists.
    */
   bool HasKey(int64_t key) const;
 
   /*
-   * @brief Get value by the key list, if the
+   * @brief Get value by the key list.
+   * Note!!! this interface is only used when selected_rows is used as
+   * parameters
+   * for distribute lookup table.
    *
    * @return a list of pair which contains the non-exists key and the index in
    * the value
    */
-  std::vector<std::pair<int64_t, int64_t>> Get(const std::vector<int64_t>& keys,
-                                               framework::Tensor* value) const;
+  void Get(const framework::Tensor& ids, framework::Tensor* value,
+           bool auto_grown = false);
 
   /*
-   * @brief Set a key-value pair into the table.
-   *  This function will double the value memory if it's not engouth.
+   * @brief Get the index of the key from id_to_index_ map. If the key not
+   * exist,
+   * add the key into id_to_index_.
    *
-   * @note:
-   *    1. The first dim of the value should be 1
-   *    2. The value should be initialized and the data type
-   *       should be the same with the table.
-   *
-   * @return true if the key is a new one, otherwise false
+   * Note!!! this interface is only used when selected_rows is used as
+   * parameters
+   * for distribute lookup table.
    *
+   * @return index of the key.
    */
-  bool Set(int64_t key, const Tensor& value);
+  int64_t AutoGrownIndex(int64_t key, bool auto_grown);
 
-  /*
-   * @brief Get the index of key in rows
-   *
-   * @return -1 if the key does not exists.
-   */
-  int64_t Index(int64_t key) const {
-    auto it = std::find(rows_.begin(), rows_.end(), key);
-    if (it == rows_.end()) {
-      return static_cast<int64_t>(-1);
-    }
-    return static_cast<int64_t>(std::distance(rows_.begin(), it));
-  }
+  void SyncIndex();
 
   DDim GetCompleteDims() const {
     std::vector<int64_t> dims = vectorize(value_->dims());
@@ -127,9 +133,10 @@ class SelectedRows {
   // SelectedRows are simply concated when adding together. Until a
   // SelectedRows add a Tensor, will the duplicate rows be handled.
   Vector<int64_t> rows_;
+  std::unordered_map<int64_t, int64_t> id_to_index_;
   std::unique_ptr<Tensor> value_{nullptr};
   int64_t height_;
-  std::unique_ptr<std::mutex> auto_grown_mutex_{nullptr};
+  std::unique_ptr<RWLock> rwlock_{nullptr};
 };
 
 /*

paddle/fluid/framework/selected_rows_test.cc

@@ -9,8 +9,11 @@ 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/selected_rows.h"
+#include <time.h>
+#include <thread>  // NOLINT
+
 #include "gtest/gtest.h"
+#include "paddle/fluid/framework/selected_rows.h"
 
 namespace paddle {
 namespace framework {
@@ -59,39 +62,129 @@ TEST_F(SelectedRowsTester, SerializeAndDeseralize) {
   ASSERT_EQ(selected_rows_->GetCompleteDims(), dst_tensor.GetCompleteDims());
 }
 
-TEST_F(SelectedRowsTester, SparseTable) {
+TEST(SelectedRows, SparseTable) {
   platform::CPUPlace cpu;
   SelectedRows table;
+
+  int64_t table_size = 100;
+  int64_t embedding_width = 8;
   // initialize a sparse table
-  table.mutable_value()->Resize(framework::make_ddim({1, 100}));
-  table.mutable_value()->mutable_data<float>(cpu);
-  table.mutable_rows()->push_back(1);
+  table.mutable_value()->Resize(
+      framework::make_ddim({table_size, embedding_width}));
+  auto* data = table.mutable_value()->mutable_data<float>(cpu);
+  for (int64_t i = 0; i < table_size; ++i) {
+    for (int64_t j = 0; j < embedding_width; ++j) {
+      data[i * embedding_width + j] = static_cast<float>(i);
+    }
+  }
+  ASSERT_EQ(table.AutoGrownIndex(10, true), 0);
+  ASSERT_EQ(table.AutoGrownIndex(8, true), 1);
+  ASSERT_EQ(table.AutoGrownIndex(8, true), 1);
+  ASSERT_EQ(table.AutoGrownIndex(6, true), 2);
+  ASSERT_TRUE(table.HasKey(10));
+  ASSERT_TRUE(table.HasKey(8));
+  ASSERT_TRUE(table.HasKey(6));
+  ASSERT_EQ(table.rows().size(), 3);
+
+  framework::Tensor ids;
+  ids.Resize(framework::make_ddim({4}));
+  auto* ids_data = ids.mutable_data<int64_t>(cpu);
+  ids_data[0] = static_cast<int64_t>(6);
+  ids_data[1] = static_cast<int64_t>(6);
+  ids_data[2] = static_cast<int64_t>(8);
+  ids_data[3] = static_cast<int64_t>(10);
 
-  int64_t key = 10000;
-  int64_t non_key = 999;
-  framework::Tensor value;
-  value.Resize(framework::make_ddim({1, 100}));
-  auto ptr = value.mutable_data<float>(cpu);
-  ptr[0] = static_cast<float>(10);
+  framework::Tensor get_value;
+  auto* value_data = get_value.mutable_data<float>(
+      framework::make_ddim({4, embedding_width}), cpu);
+  table.Get(ids, &get_value);
 
-  ASSERT_EQ(table.rows().size(), static_cast<size_t>(1));
-  ASSERT_EQ(table.HasKey(key), false);
+  for (int j = 0; j < embedding_width; ++j) {
+    ASSERT_EQ(value_data[0 * embedding_width + j], 2);
+  }
+  for (int j = 0; j < embedding_width; ++j) {
+    ASSERT_EQ(value_data[1 * embedding_width + j], 2);
+  }
+  for (int j = 0; j < embedding_width; ++j) {
+    ASSERT_EQ(value_data[2 * embedding_width + j], 1);
+  }
+  for (int j = 0; j < embedding_width; ++j) {
+    ASSERT_EQ(value_data[3 * embedding_width + j], 0);
+  }
+}
 
-  table.Set(key, value);
+void f1(SelectedRows* table, int table_size) {
+  for (int i = 1000000; i > 0; --i) {
+    auto id = i % table_size;
+    int64_t index1 = table->AutoGrownIndex(id, true);
+    int64_t index2 = table->AutoGrownIndex(id, false);
+    int64_t index3 = table->AutoGrownIndex(id, true);
+    ASSERT_EQ(index1, index2);
+    ASSERT_EQ(index2, index3);
+  }
+}
 
-  ASSERT_EQ(table.rows().size(), static_cast<size_t>(2));
-  ASSERT_EQ(table.HasKey(key), true);
-  // check re-allocate
-  ASSERT_EQ(table.value().dims()[0], static_cast<int64_t>(4));
+void f2(SelectedRows* table, int table_size) {
+  for (int i = 0; i < 1000000; ++i) {
+    auto id = i % table_size;
+    int64_t index1 = table->AutoGrownIndex(id, true);
+    int64_t index2 = table->AutoGrownIndex(id, false);
+    int64_t index3 = table->AutoGrownIndex(id, true);
+    ASSERT_EQ(index1, index2);
+    ASSERT_EQ(index2, index3);
+  }
+}
 
-  framework::Tensor get_value;
-  get_value.mutable_data<float>(framework::make_ddim({2, 100}), cpu);
-  std::vector<int64_t> keys({non_key, key});
-  auto non_key_pairs = table.Get(keys, &get_value);
+void f3(SelectedRows* table, int table_size) {
+  clock_t t1 = clock();
+  for (int i = 100000; i > 0; --i) {
+    auto id1 = table->AutoGrownIndex(i % table_size, true);
+    auto id2 = table->Index(i % table_size);
+    ASSERT_EQ(id1, id2);
+  }
+  clock_t t2 = clock();
+  std::cout << "f3 run time:" << t2 - t1 << std::endl;
+}
+
+void f4(SelectedRows* table, int table_size) {
+  clock_t t1 = clock();
+  for (int i = 0; i < 100000; ++i) {
+    auto id1 = table->AutoGrownIndex(i % table_size, true);
+    auto id2 = table->Index(i % table_size);
+    ASSERT_EQ(id1, id2);
+  }
+  clock_t t2 = clock();
+  std::cout << "f4 run time:" << t2 - t1 << std::endl;
+}
+
+TEST(SelectedRows, MultiThreadAutoIndex) {
+  platform::CPUPlace cpu;
+  SelectedRows table;
+
+  int64_t table_size = 100000;
+  int64_t embedding_width = 8;
+  // initialize a sparse table
+  table.mutable_value()->Resize(
+      framework::make_ddim({table_size, embedding_width}));
+  auto* data = table.mutable_value()->mutable_data<float>(cpu);
+  for (int64_t i = 0; i < table_size; ++i) {
+    for (int64_t j = 0; j < embedding_width; ++j) {
+      data[i * embedding_width + j] = static_cast<float>(i);
+    }
+  }
 
-  ASSERT_EQ(get_value.data<float>()[100], static_cast<float>(10));
-  ASSERT_EQ(non_key_pairs.size(), static_cast<size_t>(1));
-  ASSERT_EQ(non_key_pairs[0].first, non_key);
+  std::thread t1(f1, &table, table_size);
+  std::thread t11(f1, &table, table_size);
+  std::thread t2(f2, &table, table_size);
+  std::thread t22(f2, &table, table_size);
+  t1.join();
+  t11.join();
+  t2.join();
+  t22.join();
+  std::thread t3(f3, &table, table_size);
+  std::thread t4(f4, &table, table_size);
+  t3.join();
+  t4.join();
 }
 
 }  // namespace framework

paddle/fluid/operators/distributed/rpc_server_test.cc

@@ -78,10 +78,9 @@ void InitTensorsOnServer(framework::Scope* scope, platform::CPUPlace* place,
                          int64_t rows_numel) {
   CreateVarsOnScope(scope, place);
   auto w = scope->Var("w")->GetMutable<framework::SelectedRows>();
-  auto rows = w->mutable_rows();
-  for (int64_t i = 0; i < rows_numel; ++i) rows->push_back(i);
   auto w_value = w->mutable_value();
   w_value->Resize({rows_numel, 10});
+  for (int64_t i = 0; i < rows_numel; ++i) w->AutoGrownIndex(i, true);
 
   auto ptr = w_value->mutable_data<float>(*place);
 

paddle/fluid/operators/lookup_sparse_table_op.cc

@@ -17,7 +17,6 @@ limitations under the License. */
 #include "paddle/fluid/framework/data_type.h"
 #include "paddle/fluid/framework/op_registry.h"
 #include "paddle/fluid/operators/math/math_function.h"
-#include "paddle/fluid/platform/device_context.h"
 
 namespace paddle {
 namespace operators {
@@ -46,10 +45,6 @@ class LookupSparseTableOp : public framework::OperatorBase {
     auto out_var = scope.FindVar(Output("Out"));
     auto w_var = scope.FindVar(Input("W"));
     auto ids_var = scope.FindVar(Input("Ids"));
-    unsigned int seed = static_cast<unsigned int>(Attr<int>("seed"));
-    float min = Attr<float>("min");
-    float max = Attr<float>("max");
-    bool auto_grown_table = Attr<bool>("auto_grown_table");
 
     PADDLE_ENFORCE(out_var->IsType<framework::LoDTensor>(),
                    "The type of Out var should be LodTensor.");
@@ -60,46 +55,17 @@ class LookupSparseTableOp : public framework::OperatorBase {
     auto &ids_t = ids_var->Get<framework::LoDTensor>();
     auto out_t = out_var->GetMutable<framework::LoDTensor>();
     auto w_t = w_var->GetMutable<framework::SelectedRows>();
-    std::vector<int64_t> keys;
-    keys.resize(ids_t.numel());
-    for (int64_t i = 0; i < ids_t.numel(); ++i) {
-      keys[i] = ids_t.data<int64_t>()[i];
-    }
 
     // TODO(Yancey1989): support CUDA Place for the sparse table
     platform::CPUPlace cpu;
     auto out_shape = w_t->value().dims();
-    out_shape[0] = keys.size();
+    out_shape[0] = ids_t.numel();
     out_t->Resize(out_shape);
     out_t->mutable_data(cpu, w_t->value().type());
     PADDLE_ENFORCE_EQ(framework::ToDataType(w_t->value().type()),
                       framework::proto::VarType::FP32,
                       "The sparse table only support FP32");
-    auto non_keys_pair = w_t->Get(keys, out_t);
-    if (!auto_grown_table) {
-      PADDLE_ENFORCE_EQ(non_keys_pair.size(), static_cast<size_t>(0),
-                        "there is some keys does exists in the sparse table.");
-    }
-    auto value_shape = w_t->value().dims();
-    value_shape[0] = 1;
-    for (const auto &it : non_keys_pair) {
-      const auto key = it.first;
-      const auto index = it.second;
-      framework::Tensor value;
-      value.Resize(value_shape);
-      auto data = value.mutable_data<float>(cpu);
-
-      std::minstd_rand engine;
-      engine.seed(seed);
-      std::uniform_real_distribution<float> dist(min, max);
-      int64_t size = value.numel();
-      for (int64_t i = 0; i < size; ++i) {
-        data[i] = dist(engine);
-      }
-      w_t->Set(key, value);
-      memory::Copy(cpu, out_t->mutable_data<float>(cpu) + index * value.numel(),
-                   cpu, value.data<float>(), value.numel() * sizeof(float));
-    }
+    w_t->Get(ids_t, out_t, true);
   }
 };
 
@@ -121,21 +87,6 @@ class LookupSparseTableOpMaker : public framework::OpProtoAndCheckerMaker {
                      "Otherwise the given value indicates padding the output "
                      "with zeros whenever lookup encounters it in Ids.")
         .SetDefault(kNoPadding);
-    AddAttr<float>("min",
-                   "(float, default -1.0) "
-                   "Minimum value of uniform random")
-        .SetDefault(-1.0f);
-    AddAttr<float>("max",
-                   "(float, default 1.0) "
-                   "Maximum value of uniform random")
-        .SetDefault(1.0f);
-    AddAttr<int>("seed",
-                 "(int, default 0) "
-                 "Random seed used for generating samples. "
-                 "0 means use a seed generated by the system."
-                 "Note that if seed is not 0, this operator will always "
-                 "generate the same random numbers every time.")
-        .SetDefault(0);
     AddAttr<bool>("auto_grown_table",
                   "(bool default false)"
                   "Whether create new value if for nonexistent key.")

paddle/fluid/operators/sgd_op.h

@@ -111,7 +111,7 @@ class SGDOpKernel : public framework::OpKernel<T> {
       for (size_t i = 0; i < grad.rows().size(); i++) {
         PADDLE_ENFORCE(grad.rows()[i] < grad.height(),
                        "Input rows index should less than height");
-        int64_t id_index = param.Index(grad.rows()[i]);
+        int64_t id_index = param_out->AutoGrownIndex(grad.rows()[i], false);
         PADDLE_ENFORCE_GE(id_index, static_cast<int64_t>(0),
                           "id should be in the table");
         for (int64_t j = 0; j < grad_row_width; j++) {

paddle/fluid/operators/uniform_random_op.cc

@@ -30,8 +30,10 @@ class CPUUniformRandomKernel : public framework::OpKernel<T> {
       tensor = out_var->GetMutable<framework::LoDTensor>();
     } else if (out_var->IsType<framework::SelectedRows>()) {
       auto shape = ctx.Attr<std::vector<int>>("shape");
-      tensor = out_var->GetMutable<framework::SelectedRows>()->mutable_value();
+      auto* selected_rows = out_var->GetMutable<framework::SelectedRows>();
+      tensor = selected_rows->mutable_value();
       tensor->Resize(framework::make_ddim(shape));
+      selected_rows->mutable_rows()->reserve(shape[0]);
     } else {
       PADDLE_THROW(
           "uniform_random_op's output only"

paddle/fluid/pybind/pybind.cc

@@ -249,6 +249,7 @@ PYBIND11_PLUGIN(core) {
         self.set_rows(new_rows);
 #endif
            })
+      .def("sync_index", [](SelectedRows &instance) { instance.SyncIndex(); })
       .def("rows", [](SelectedRows &self) {
         auto rows = self.rows();
         std::vector<int64_t> new_rows;

python/paddle/fluid/tests/unittests/test_lookup_sparse_table_op.py

@@ -21,36 +21,27 @@ import paddle.fluid.core as core
 from paddle.fluid.op import Operator
 
 
-def output_hist(out):
-    hist, _ = np.histogram(out, range=(-5, 10))
-    hist = hist.astype("float32")
-    hist /= float(out.size)
-    prob = 0.1 * np.ones((10))
-    return hist, prob
-
-
 class TestLookupSpraseTable(OpTest):
     def check_with_place(self, place):
         scope = core.Scope()
 
-        # create and initialize Id Variable
-        ids = scope.var("Ids").get_tensor()
-        ids_array = np.array([0, 2, 3, 5, 100]).astype("int64")
-        ids.set(ids_array, place)
-
         # create and initialize W Variable
-        rows = [0, 1, 2, 3, 4, 5, 6]
-        row_numel = 10000
+        table_size = 10000
+        row_numel = 8
 
         w_selected_rows = scope.var('W').get_selected_rows()
-        w_selected_rows.set_height(len(rows))
-        w_selected_rows.set_rows(rows)
-        w_array = np.ones((len(rows), row_numel)).astype("float32")
-        for i in range(len(rows)):
+        w_selected_rows.set_height(table_size)
+        w_array = np.ones((table_size, row_numel)).astype("float32")
+        for i in range(table_size):
             w_array[i] *= i
         w_tensor = w_selected_rows.get_tensor()
         w_tensor.set(w_array, place)
 
+        # create and initialize Id Variable
+        ids = scope.var("Ids").get_tensor()
+        ids_array1 = np.array([0, 2, 3, 2, 5, 0, 100]).astype("int64")
+        ids.set(ids_array1, place)
+
         # create Out Variable
         out_tensor = scope.var('Out').get_tensor()
 
@@ -66,16 +57,28 @@ class TestLookupSpraseTable(OpTest):
         lookup_table.run(scope, place)
 
         # get result from Out
-        result_array = np.array(out_tensor)
+        result_array1 = np.array(out_tensor)
         # all(): return True if all elements of the iterable are true (or if the iterable is empty)
-        for idx, row in enumerate(ids_array[:-2]):
-            assert (row == result_array[idx]).all()
+        assert (result_array1[0] == w_array[0]).all()
+        assert (result_array1[1] == w_array[1]).all()
+        assert (result_array1[2] == w_array[2]).all()
+        assert (result_array1[3] == w_array[1]).all()
+        assert (result_array1[4] == w_array[3]).all()
+        assert (result_array1[5] == w_array[0]).all()
+        assert (result_array1[6] == w_array[4]).all()
+
+        # create and initialize Id Variable
+        ids = scope.var("Ids").get_tensor()
+        ids_array2 = np.array([4, 2, 3, 7, 100000]).astype("int64")
+        ids.set(ids_array2, place)
+        lookup_table.run(scope, place)
 
-        # check the random value
-        hist, prob = output_hist(result_array[-1])
-        self.assertTrue(
-            np.allclose(
-                hist, prob, rtol=0, atol=0.01), "hist: " + str(hist))
+        result_array2 = np.array(out_tensor)
+        assert (result_array2[0] == w_array[5]).all()
+        assert (result_array2[1] == w_array[1]).all()
+        assert (result_array2[2] == w_array[2]).all()
+        assert (result_array2[3] == w_array[6]).all()
+        assert (result_array2[4] == w_array[7]).all()
 
     def test_w_is_selected_rows(self):
         places = [core.CPUPlace()]

python/paddle/fluid/tests/unittests/test_sgd_op.py

@@ -126,6 +126,7 @@ class TestSGDOpOptimizeSelectedRows(unittest.TestCase):
         w_selected_rows = scope.var('Param').get_selected_rows()
         w_selected_rows.set_height(len(param_rows))
         w_selected_rows.set_rows(param_rows)
+        w_selected_rows.sync_index()
         w_array = np.ones((len(param_rows), row_width)).astype("float32")
         for i in range(len(param_rows)):
             w_array[i] *= i