diff --git a/paddle/fluid/distributed/ps/table/CMakeLists.txt b/paddle/fluid/distributed/ps/table/CMakeLists.txt
index 9aa9ecc2afdcfd83bd50519dc6c917603b23848e..c0a7e33a6b23c967e3e31b6e9fc1e6083ae59794 100644
--- a/paddle/fluid/distributed/ps/table/CMakeLists.txt
+++ b/paddle/fluid/distributed/ps/table/CMakeLists.txt
@@ -41,9 +41,11 @@ cc_library(tensor_table SRCS tensor_table.cc DEPS eigen3 ps_framework_proto exec
 set_source_files_properties(table.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
 
 set_source_files_properties(sparse_sgd_rule.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
+set_source_files_properties(ctr_double_accessor.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
 set_source_files_properties(ctr_accessor.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
 set_source_files_properties(memory_sparse_table.cc PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})
 cc_library(sparse_sgd_rule SRCS sparse_sgd_rule.cc DEPS ${TABLE_DEPS} ps_framework_proto)
+cc_library(ctr_double_accessor SRCS ctr_double_accessor.cc DEPS ${TABLE_DEPS} ps_framework_proto sparse_sgd_rule)
 cc_library(ctr_accessor SRCS ctr_accessor.cc DEPS ${TABLE_DEPS} ps_framework_proto sparse_sgd_rule)
 cc_library(memory_sparse_table SRCS memory_sparse_table.cc DEPS ps_framework_proto ${TABLE_DEPS} fs afs_wrapper ctr_accessor common_table)
 
diff --git a/paddle/fluid/distributed/ps/table/ctr_double_accessor.cc b/paddle/fluid/distributed/ps/table/ctr_double_accessor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b07bcf70ad7af416fc66e036c0061f9556cc4eae
--- /dev/null
+++ b/paddle/fluid/distributed/ps/table/ctr_double_accessor.cc
@@ -0,0 +1,399 @@
+// Copyright (c) 2021 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/distributed/ps/table/ctr_double_accessor.h"
+#include <gflags/gflags.h>
+#include "glog/logging.h"
+#include "paddle/fluid/string/string_helper.h"
+
+namespace paddle {
+namespace distributed {
+
+int DownpourCtrDoubleAccessor::initialize() {
+  auto name = _config.embed_sgd_param().name();
+  _embed_sgd_rule = CREATE_PSCORE_CLASS(SparseValueSGDRule, name);
+  _embed_sgd_rule->load_config(_config.embed_sgd_param(), 1);
+
+  name = _config.embedx_sgd_param().name();
+  _embedx_sgd_rule = CREATE_PSCORE_CLASS(SparseValueSGDRule, name);
+  _embedx_sgd_rule->load_config(_config.embedx_sgd_param(),
+                                _config.embedx_dim());
+
+  _show_click_decay_rate = _config.ctr_accessor_param().show_click_decay_rate();
+  _ssd_unseenday_threshold =
+      _config.ctr_accessor_param().ssd_unseenday_threshold();
+
+  return 0;
+}
+
+size_t DownpourCtrDoubleAccessor::dim() {
+  auto embedx_dim = _config.embedx_dim();
+  return DownpourCtrDoubleFeatureValue::dim(embedx_dim);
+}
+size_t DownpourCtrDoubleAccessor::dim_size(size_t dim) {
+  auto embedx_dim = _config.embedx_dim();
+  return DownpourCtrDoubleFeatureValue::dim_size(dim, embedx_dim);
+}
+size_t DownpourCtrDoubleAccessor::size() {
+  auto embedx_dim = _config.embedx_dim();
+  return DownpourCtrDoubleFeatureValue::size(embedx_dim);
+}
+size_t DownpourCtrDoubleAccessor::mf_size() {
+  return (_config.embedx_dim() + 1) * sizeof(float);  // embedx embedx_g2sum
+}
+// pull value
+size_t DownpourCtrDoubleAccessor::select_dim() {
+  auto embedx_dim = _config.embedx_dim();
+  return 3 + embedx_dim;
+}
+size_t DownpourCtrDoubleAccessor::select_dim_size(size_t dim) {
+  return sizeof(float);
+}
+size_t DownpourCtrDoubleAccessor::select_size() {
+  return select_dim() * sizeof(float);
+}
+// push value
+size_t DownpourCtrDoubleAccessor::update_dim() {
+  auto embedx_dim = _config.embedx_dim();
+  return 4 + embedx_dim;
+}
+size_t DownpourCtrDoubleAccessor::update_dim_size(size_t dim) {
+  return sizeof(float);
+}
+size_t DownpourCtrDoubleAccessor::update_size() {
+  return update_dim() * sizeof(float);
+}
+bool DownpourCtrDoubleAccessor::shrink(float* value) {
+  // auto base_threshold = _config.ctr_accessor_param().base_threshold();
+  // auto delta_threshold = _config.ctr_accessor_param().delta_threshold();
+  // auto delete_threshold = _config.ctr_accessor_param().delete_threshold();
+  auto base_threshold = _config.ctr_accessor_param().base_threshold();
+  auto delta_threshold = _config.ctr_accessor_param().delta_threshold();
+  auto delete_after_unseen_days =
+      _config.ctr_accessor_param().delete_after_unseen_days();
+  auto delete_threshold = _config.ctr_accessor_param().delete_threshold();
+  // time_decay first
+  DownpourCtrDoubleFeatureValue::show(value) *= _show_click_decay_rate;
+  DownpourCtrDoubleFeatureValue::click(value) *= _show_click_decay_rate;
+  // shrink after
+  auto score = show_click_score(DownpourCtrDoubleFeatureValue::show(value),
+                                DownpourCtrDoubleFeatureValue::click(value));
+  auto unseen_days = DownpourCtrDoubleFeatureValue::unseen_days(value);
+  if (score < delete_threshold || unseen_days > delete_after_unseen_days) {
+    return true;
+  }
+  return false;
+}
+bool DownpourCtrDoubleAccessor::save_ssd(float* value) {
+  if (DownpourCtrDoubleFeatureValue::unseen_days(value) >
+      _ssd_unseenday_threshold) {
+    return true;
+  }
+  return false;
+}
+// bool DownpourCtrDoubleAccessor::save_cache(
+//         float* value, int param, double global_cache_threshold) {
+//     auto base_threshold = _config.ctr_accessor_param().base_threshold();
+//     auto delta_keep_days = _config.ctr_accessor_param().delta_keep_days();
+//     if (show_click_score(DownpourCtrDoubleFeatureValue::show(value),
+//     DownpourCtrDoubleFeatureValue::click(value)) >= base_threshold
+//         && DownpourCtrDoubleFeatureValue::unseen_days(value) <=
+//         delta_keep_days) {
+//         return DownpourCtrDoubleFeatureValue::show(value) >
+//         global_cache_threshold;
+//     }
+//     return false;
+// }
+bool DownpourCtrDoubleAccessor::save(float* value, int param) {
+  // auto base_threshold = _config.ctr_accessor_param().base_threshold();
+  // auto delta_threshold = _config.ctr_accessor_param().delta_threshold();
+  // auto delta_keep_days = _config.ctr_accessor_param().delta_keep_days();
+  auto base_threshold = _config.ctr_accessor_param().base_threshold();
+  auto delta_threshold = _config.ctr_accessor_param().delta_threshold();
+  auto delta_keep_days = _config.ctr_accessor_param().delta_keep_days();
+  if (param == 2) {
+    delta_threshold = 0;
+  }
+  switch (param) {
+    // save all
+    case 0: {
+      return true;
+    }
+    // save xbox delta
+    case 1:
+    // save xbox base
+    case 2: {
+      if (show_click_score(DownpourCtrDoubleFeatureValue::show(value),
+                           DownpourCtrDoubleFeatureValue::click(value)) >=
+              base_threshold &&
+          DownpourCtrDoubleFeatureValue::delta_score(value) >=
+              delta_threshold &&
+          DownpourCtrDoubleFeatureValue::unseen_days(value) <=
+              delta_keep_days) {
+        // do this after save, because it must not be modified when retry
+        if (param == 2) {
+          DownpourCtrDoubleFeatureValue::delta_score(value) = 0;
+        }
+        return true;
+      } else {
+        return false;
+      }
+    }
+    // already decayed in shrink
+    case 3: {
+      // DownpourCtrFeatureValue::show(value) *= _show_click_decay_rate;
+      // DownpourCtrFeatureValue::click(value) *= _show_click_decay_rate;
+      // do this after save, because it must not be modified when retry
+      // DownpourCtrDoubleFeatureValue::unseen_days(value)++;
+      return true;
+    }
+    default:
+      return true;
+  };
+}
+
+void DownpourCtrDoubleAccessor::update_stat_after_save(float* value,
+                                                       int param) {
+  auto base_threshold = _config.ctr_accessor_param().base_threshold();
+  auto delta_threshold = _config.ctr_accessor_param().delta_threshold();
+  auto delta_keep_days = _config.ctr_accessor_param().delta_keep_days();
+  if (param == 2) {
+    delta_threshold = 0;
+  }
+  switch (param) {
+    case 1: {
+      if (show_click_score(DownpourCtrDoubleFeatureValue::show(value),
+                           DownpourCtrDoubleFeatureValue::click(value)) >=
+              base_threshold &&
+          DownpourCtrDoubleFeatureValue::delta_score(value) >=
+              delta_threshold &&
+          DownpourCtrDoubleFeatureValue::unseen_days(value) <=
+              delta_keep_days) {
+        DownpourCtrDoubleFeatureValue::delta_score(value) = 0;
+      }
+    }
+      return;
+    case 3: {
+      DownpourCtrDoubleFeatureValue::unseen_days(value)++;
+    }
+      return;
+    default:
+      return;
+  };
+}
+
+int32_t DownpourCtrDoubleAccessor::create(float** values, size_t num) {
+  auto embedx_dim = _config.embedx_dim();
+  for (size_t value_item = 0; value_item < num; ++value_item) {
+    float* value = values[value_item];
+    value[DownpourCtrDoubleFeatureValue::unseen_days_index()] = 0;
+    value[DownpourCtrDoubleFeatureValue::delta_score_index()] = 0;
+    *(double*)(value + DownpourCtrDoubleFeatureValue::show_index()) = 0;
+    *(double*)(value + DownpourCtrDoubleFeatureValue::click_index()) = 0;
+    value[DownpourCtrDoubleFeatureValue::slot_index()] = -1;
+    _embed_sgd_rule->init_value(
+        value + DownpourCtrDoubleFeatureValue::embed_w_index(),
+        value + DownpourCtrDoubleFeatureValue::embed_g2sum_index());
+    _embedx_sgd_rule->init_value(
+        value + DownpourCtrDoubleFeatureValue::embedx_w_index(),
+        value + DownpourCtrDoubleFeatureValue::embedx_g2sum_index(), false);
+  }
+  return 0;
+}
+bool DownpourCtrDoubleAccessor::need_extend_mf(float* value) {
+  auto show =
+      ((double*)(value + DownpourCtrDoubleFeatureValue::show_index()))[0];
+  auto click =
+      ((double*)(value + DownpourCtrDoubleFeatureValue::click_index()))[0];
+  // float score = (show - click) * _config.ctr_accessor_param().nonclk_coeff()
+  auto score = (show - click) * _config.ctr_accessor_param().nonclk_coeff() +
+               click * _config.ctr_accessor_param().click_coeff();
+  //+ click * _config.ctr_accessor_param().click_coeff();
+  return score >= _config.embedx_threshold();
+}
+// from DownpourCtrFeatureValue to DownpourCtrPullValue
+int32_t DownpourCtrDoubleAccessor::select(float** select_values,
+                                          const float** values, size_t num) {
+  auto embedx_dim = _config.embedx_dim();
+  for (size_t value_item = 0; value_item < num; ++value_item) {
+    float* select_value = select_values[value_item];
+    float* value = const_cast<float*>(values[value_item]);
+    select_value[DownpourCtrDoublePullValue::show_index()] =
+        (float)*(double*)(value + DownpourCtrDoubleFeatureValue::show_index());
+    select_value[DownpourCtrDoublePullValue::click_index()] =
+        (float)*(double*)(value + DownpourCtrDoubleFeatureValue::click_index());
+    select_value[DownpourCtrDoublePullValue::embed_w_index()] =
+        value[DownpourCtrDoubleFeatureValue::embed_w_index()];
+    memcpy(select_value + DownpourCtrDoublePullValue::embedx_w_index(),
+           value + DownpourCtrDoubleFeatureValue::embedx_w_index(),
+           embedx_dim * sizeof(float));
+  }
+  return 0;
+}
+// from DownpourCtrPushValue to DownpourCtrPushValue
+// first dim: item
+// second dim: field num
+int32_t DownpourCtrDoubleAccessor::merge(float** update_values,
+                                         const float** other_update_values,
+                                         size_t num) {
+  auto embedx_dim = _config.embedx_dim();
+  size_t total_dim = DownpourCtrDoublePushValue::dim(embedx_dim);
+  for (size_t value_item = 0; value_item < num; ++value_item) {
+    float* update_value = update_values[value_item];
+    const float* other_update_value = other_update_values[value_item];
+    /**(double*)(update_value + DownpourCtrDoublePushValue::show_index()) +=
+    *(double*)(other_update_value + DownpourCtrDoublePushValue::show_index());
+    *(double*)(update_value + DownpourCtrDoublePushValue::click_index()) +=
+    *(double*)(other_update_value + DownpourCtrDoublePushValue::click_index());
+    for (auto i = 3u; i < total_dim; ++i) {
+        update_value[i] += other_update_value[i];
+    }*/
+    for (auto i = 0u; i < total_dim; ++i) {
+      if (i != DownpourCtrDoublePushValue::slot_index()) {
+        update_value[i] += other_update_value[i];
+      }
+    }
+  }
+  return 0;
+}
+// from DownpourCtrPushValue to DownpourCtrFeatureValue
+// first dim: item
+// second dim: field num
+int32_t DownpourCtrDoubleAccessor::update(float** update_values,
+                                          const float** push_values,
+                                          size_t num) {
+  auto embedx_dim = _config.embedx_dim();
+  for (size_t value_item = 0; value_item < num; ++value_item) {
+    float* update_value = update_values[value_item];
+    const float* push_value = push_values[value_item];
+    float push_show = push_value[DownpourCtrDoublePushValue::show_index()];
+    float push_click = push_value[DownpourCtrDoublePushValue::click_index()];
+    float slot = push_value[DownpourCtrDoublePushValue::slot_index()];
+    *(double*)(update_value + DownpourCtrDoubleFeatureValue::show_index()) +=
+        (double)push_show;
+    *(double*)(update_value + DownpourCtrDoubleFeatureValue::click_index()) +=
+        (double)push_click;
+    update_value[DownpourCtrDoubleFeatureValue::slot_index()] = slot;
+    update_value[DownpourCtrDoubleFeatureValue::delta_score_index()] +=
+        (push_show - push_click) * _config.ctr_accessor_param().nonclk_coeff() +
+        push_click * _config.ctr_accessor_param().click_coeff();
+    //(push_show - push_click) * _config.ctr_accessor_param().nonclk_coeff() +
+    // push_click * _config.ctr_accessor_param().click_coeff();
+    update_value[DownpourCtrDoubleFeatureValue::unseen_days_index()] = 0;
+    _embed_sgd_rule->update_value(
+        update_value + DownpourCtrDoubleFeatureValue::embed_w_index(),
+        update_value + DownpourCtrDoubleFeatureValue::embed_g2sum_index(),
+        push_value + DownpourCtrDoublePushValue::embed_g_index(), push_show);
+    _embedx_sgd_rule->update_value(
+        update_value + DownpourCtrDoubleFeatureValue::embedx_w_index(),
+        update_value + DownpourCtrDoubleFeatureValue::embedx_g2sum_index(),
+        push_value + DownpourCtrDoublePushValue::embedx_g_index(), push_show);
+  }
+  return 0;
+}
+bool DownpourCtrDoubleAccessor::create_value(int stage, const float* value) {
+  // stage == 0, pull
+  // stage == 1, push
+  if (stage == 0) {
+    return true;
+  } else if (stage == 1) {
+    auto show = DownpourCtrDoublePushValue::show(const_cast<float*>(value));
+    auto click = DownpourCtrDoublePushValue::click(const_cast<float*>(value));
+    auto score = show_click_score(show, click);
+    if (score <= 0) {
+      return false;
+    }
+    if (score >= 1) {
+      return true;
+    }
+    return local_uniform_real_distribution<float>()(local_random_engine()) <
+           score;
+  } else {
+    return true;
+  }
+}
+double DownpourCtrDoubleAccessor::show_click_score(double show, double click) {
+  // auto nonclk_coeff = _config.ctr_accessor_param().nonclk_coeff();
+  // auto click_coeff = _config.ctr_accessor_param().click_coeff();
+  auto nonclk_coeff = _config.ctr_accessor_param().nonclk_coeff();
+  auto click_coeff = _config.ctr_accessor_param().click_coeff();
+  return (show - click) * nonclk_coeff + click * click_coeff;
+}
+std::string DownpourCtrDoubleAccessor::parse_to_string(const float* v,
+                                                       int param_size) {
+  thread_local std::ostringstream os;
+  os.clear();
+  os.str("");
+  os << v[0] << " " << v[1] << " " << (float)((double*)(v + 2))[0] << " "
+     << (float)((double*)(v + 4))[0] << " " << v[6] << " " << v[7] << " "
+     << v[8];
+  auto show = DownpourCtrDoubleFeatureValue::show(const_cast<float*>(v));
+  auto click = DownpourCtrDoubleFeatureValue::click(const_cast<float*>(v));
+  auto score = show_click_score(show, click);
+  if (score >= _config.embedx_threshold() && param_size > 9) {
+    os << " " << v[9];
+    for (auto i = 0; i < _config.embedx_dim(); ++i) {
+      os << " " << v[10 + i];
+    }
+  }
+  return os.str();
+}
+int DownpourCtrDoubleAccessor::parse_from_string(const std::string& str,
+                                                 float* value) {
+  int embedx_dim = _config.embedx_dim();
+  float data_buff[dim() + 2];
+  float* data_buff_ptr = data_buff;
+  _embedx_sgd_rule->init_value(
+      data_buff_ptr + DownpourCtrDoubleFeatureValue::embedx_w_index(),
+      data_buff_ptr + DownpourCtrDoubleFeatureValue::embedx_g2sum_index());
+  auto str_len = paddle::string::str_to_float(str.data(), data_buff_ptr);
+  CHECK(str_len >= 6) << "expect more than 6 real:" << str_len;
+  int show_index = DownpourCtrDoubleFeatureValue::show_index();
+  int click_index = DownpourCtrDoubleFeatureValue::click_index();
+  int embed_w_index = DownpourCtrDoubleFeatureValue::embed_w_index();
+  // no slot, embedx
+  int value_dim = dim();
+  int embedx_g2sum_index = DownpourCtrDoubleFeatureValue::embedx_g2sum_index();
+  value[DownpourCtrDoubleFeatureValue::slot_index()] = -1;
+  // other case
+  if (str_len == (value_dim - 1)) {
+    // copy unseen_days..delta_score
+    memcpy(value, data_buff_ptr, show_index * sizeof(float));
+    // copy show & click
+    *(double*)(value + show_index) = (double)data_buff_ptr[2];
+    *(double*)(value + click_index) = (double)data_buff_ptr[3];
+    // copy others
+    value[DownpourCtrDoubleFeatureValue::embed_w_index()] = data_buff_ptr[4];
+    value[DownpourCtrDoubleFeatureValue::embed_g2sum_index()] =
+        data_buff_ptr[5];
+    memcpy(value + embedx_g2sum_index, data_buff_ptr + 6,
+           (embedx_dim + 1) * sizeof(float));
+  } else {
+    // copy unseen_days..delta_score
+    memcpy(value, data_buff_ptr, show_index * sizeof(float));
+    // copy show & click
+    *(double*)(value + show_index) = (double)data_buff_ptr[2];
+    *(double*)(value + click_index) = (double)data_buff_ptr[3];
+    // copy embed_w..embedx_w
+    memcpy(value + embed_w_index, data_buff_ptr + 4,
+           (str_len - 4) * sizeof(float));
+  }
+  if (str_len == (value_dim - 1) || str_len == 6) {
+    str_len += 1;
+  }
+  return str_len + 2;
+}
+
+}  // namespace distributed
+}  // namespace paddle
diff --git a/paddle/fluid/distributed/ps/table/ctr_double_accessor.h b/paddle/fluid/distributed/ps/table/ctr_double_accessor.h
new file mode 100644
index 0000000000000000000000000000000000000000..d7c717ace098821c3434888c9ff0ad699c923867
--- /dev/null
+++ b/paddle/fluid/distributed/ps/table/ctr_double_accessor.h
@@ -0,0 +1,245 @@
+// Copyright (c) 2021 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 <stdint.h>
+#include <stdio.h>
+#include <vector>
+#include "paddle/fluid/distributed/common/registerer.h"
+#include "paddle/fluid/distributed/ps.pb.h"
+#include "paddle/fluid/distributed/ps/table/accessor.h"
+#include "paddle/fluid/distributed/ps/table/sparse_sgd_rule.h"
+
+namespace paddle {
+namespace distributed {
+
+class DownpourCtrDoubleAccessor : public ValueAccessor {
+ public:
+  struct DownpourCtrDoubleFeatureValue {
+    /*
+    float unseen_days;
+    float delta_score;
+    double show;
+    double click;
+    float embed_w;
+    float embed_g2sum;
+    float slot;
+    float embedx_g2sum;
+    std::vector<float> embedx_w;
+    */
+    static int dim(int embedx_dim) { return 8 + embedx_dim; }
+    static int dim_size(size_t dim, int embedx_dim) { return sizeof(float); }
+    static int size(int embedx_dim) {
+      return (dim(embedx_dim) + 2) * sizeof(float);
+    }
+    static int unseen_days_index() { return 0; }
+    static int delta_score_index() {
+      return DownpourCtrDoubleFeatureValue::unseen_days_index() + 1;
+    }
+    static int show_index() {
+      return DownpourCtrDoubleFeatureValue::delta_score_index() + 1;
+    }
+    // show is double
+    static int click_index() {
+      return DownpourCtrDoubleFeatureValue::show_index() + 2;
+    }
+    // click is double
+    static int embed_w_index() {
+      return DownpourCtrDoubleFeatureValue::click_index() + 2;
+    }
+    static int embed_g2sum_index() {
+      return DownpourCtrDoubleFeatureValue::embed_w_index() + 1;
+    }
+    static int slot_index() {
+      return DownpourCtrDoubleFeatureValue::embed_g2sum_index() + 1;
+    }
+    static int embedx_g2sum_index() {
+      return DownpourCtrDoubleFeatureValue::slot_index() + 1;
+    }
+    static int embedx_w_index() {
+      return DownpourCtrDoubleFeatureValue::embedx_g2sum_index() + 1;
+    }
+    static float& unseen_days(float* val) {
+      return val[DownpourCtrDoubleFeatureValue::unseen_days_index()];
+    }
+    static float& delta_score(float* val) {
+      return val[DownpourCtrDoubleFeatureValue::delta_score_index()];
+    }
+    static double& show(float* val) {
+      return ((double*)(val + DownpourCtrDoubleFeatureValue::show_index()))[0];
+    }
+    static double& click(float* val) {
+      return ((double*)(val + DownpourCtrDoubleFeatureValue::click_index()))[0];
+    }
+    static float& slot(float* val) {
+      return val[DownpourCtrDoubleFeatureValue::slot_index()];
+    }
+    static float& embed_w(float* val) {
+      return val[DownpourCtrDoubleFeatureValue::embed_w_index()];
+    }
+    static float& embed_g2sum(float* val) {
+      return val[DownpourCtrDoubleFeatureValue::embed_g2sum_index()];
+    }
+    static float& embedx_g2sum(float* val) {
+      return val[DownpourCtrDoubleFeatureValue::embedx_g2sum_index()];
+    }
+    static float* embedx_w(float* val) {
+      return (val + DownpourCtrDoubleFeatureValue::embedx_w_index());
+    }
+  };
+  struct DownpourCtrDoublePushValue {
+    /*
+    float slot;
+    float show;
+    float click;
+    float embed_g;
+    std::vector<float> embedx_g;
+    */
+    static int dim(int embedx_dim) { return 4 + embedx_dim; }
+    static int dim_size(int dim, int embedx_dim) { return sizeof(float); }
+    static int size(int embedx_dim) { return dim(embedx_dim) * sizeof(float); }
+    static int slot_index() { return 0; }
+    static int show_index() {
+      return DownpourCtrDoublePushValue::slot_index() + 1;
+    }
+    static int click_index() {
+      return DownpourCtrDoublePushValue::show_index() + 1;
+    }
+    static int embed_g_index() {
+      return DownpourCtrDoublePushValue::click_index() + 1;
+    }
+    static int embedx_g_index() {
+      return DownpourCtrDoublePushValue::embed_g_index() + 1;
+    }
+    static float& slot(float* val) {
+      return val[DownpourCtrDoublePushValue::slot_index()];
+    }
+    static float& show(float* val) {
+      return val[DownpourCtrDoublePushValue::show_index()];
+    }
+    static float& click(float* val) {
+      return val[DownpourCtrDoublePushValue::click_index()];
+    }
+    static float& embed_g(float* val) {
+      return val[DownpourCtrDoublePushValue::embed_g_index()];
+    }
+    static float* embedx_g(float* val) {
+      return val + DownpourCtrDoublePushValue::embedx_g_index();
+    }
+  };
+  struct DownpourCtrDoublePullValue {
+    /*
+    float show;
+    float click;
+    float embed_w;
+    std::vector<float> embedx_w;
+    */
+    static int dim(int embedx_dim) { return 3 + embedx_dim; }
+    static int dim_size(size_t dim) { return sizeof(float); }
+    static int size(int embedx_dim) { return dim(embedx_dim) * sizeof(float); }
+    static int show_index() { return 0; }
+    static int click_index() { return 1; }
+    static int embed_w_index() { return 2; }
+    static int embedx_w_index() { return 3; }
+    static float& show(float* val) {
+      return val[DownpourCtrDoublePullValue::show_index()];
+    }
+    static float& click(float* val) {
+      return val[DownpourCtrDoublePullValue::click_index()];
+    }
+    static float& embed_w(float* val) {
+      return val[DownpourCtrDoublePullValue::embed_w_index()];
+    }
+    static float* embedx_w(float* val) {
+      return val + DownpourCtrDoublePullValue::embedx_w_index();
+    }
+  };
+  DownpourCtrDoubleAccessor() {}
+  virtual ~DownpourCtrDoubleAccessor() {}
+  virtual int initialize();
+  // value维度
+  virtual size_t dim();
+  // value各个维度的size
+  virtual size_t dim_size(size_t dim);
+  // value各维度相加总size
+  virtual size_t size();
+  // value中mf动态长度部分总size大小, sparse下生效
+  virtual size_t mf_size();
+  // pull value维度
+  virtual size_t select_dim();
+  // pull value各个维度的size
+  virtual size_t select_dim_size(size_t dim);
+  // pull value各维度相加总size
+  virtual size_t select_size();
+  // push value维度
+  virtual size_t update_dim();
+  // push value各个维度的size
+  virtual size_t update_dim_size(size_t dim);
+  // push value各维度相加总size
+  virtual size_t update_size();
+  // 判断该value是否进行shrink
+  virtual bool shrink(float* value);
+  virtual bool need_extend_mf(float* value);
+  // 判断该value是否在save阶段dump,
+  // param作为参数用于标识save阶段，如downpour的xbox与batch_model
+  // param = 0, save all feature
+  // param = 1, save delta feature
+  // param = 3, save all feature with time decay
+  virtual bool save(float* value, int param) override;
+  // update delta_score and unseen_days after save
+  virtual void update_stat_after_save(float* value, int param) override;
+  // 判断该value是否保存到ssd
+  virtual bool save_ssd(float* value);
+  // virtual bool save_cache(float* value, int param, double
+  // global_cache_threshold) override;
+  // keys不存在时，为values生成随机值
+  // 要求value的内存由外部调用者分配完毕
+  virtual int32_t create(float** value, size_t num);
+  // 从values中选取到select_values中
+  virtual int32_t select(float** select_values, const float** values,
+                         size_t num);
+  // 将update_values聚合到一起
+  virtual int32_t merge(float** update_values,
+                        const float** other_update_values, size_t num);
+  // 将update_values聚合到一起，通过it.next判定是否进入下一个key
+  // virtual int32_t merge(float** update_values, iterator it);
+  // 将update_values更新应用到values中
+  virtual int32_t update(float** values, const float** update_values,
+                         size_t num);
+  virtual std::string parse_to_string(const float* value, int param) override;
+  virtual int32_t parse_from_string(const std::string& str, float* v) override;
+  virtual bool create_value(int type, const float* value);
+  //这个接口目前只用来取show
+  virtual float get_field(float* value, const std::string& name) override {
+    CHECK(name == "show");
+    if (name == "show") {
+      return (float)DownpourCtrDoubleFeatureValue::show(value);
+    }
+    return 0.0;
+  }
+  // DEFINE_GET_INDEX(DownpourCtrDoubleFeatureValue, show)
+  // DEFINE_GET_INDEX(DownpourCtrDoubleFeatureValue, click)
+  // DEFINE_GET_INDEX(DownpourCtrDoubleFeatureValue, embed_w)
+  // DEFINE_GET_INDEX(DownpourCtrDoubleFeatureValue, embedx_w)
+ private:
+  double show_click_score(double show, double click);
+
+ private:
+  SparseValueSGDRule* _embed_sgd_rule;
+  SparseValueSGDRule* _embedx_sgd_rule;
+  float _show_click_decay_rate;
+  int32_t _ssd_unseenday_threshold;
+};
+}  // namespace distributed
+}  // namespace paddle