Batch load all entries into cache at one time; Add time coefficient i…

…n the ranking score.

train-rank/src/entity/entry.h

@@ -4,6 +4,8 @@
 #include <string>
 #include <vector>
 
+#include <boost/date_time.hpp>
+
 static const char ENTRY_ID[] = "id";
 static const char ENTRY_FILE_TYPE[] = "file_type";
 static const char ENTRY_READ_LATER[] = "readlater";
@@ -17,6 +19,7 @@ static const char ENTRY_LANGUAGE[] = "language";
 static const char ENTRY_URL[] = "url";
 static const char ENTRY_PURE_CONTENT[] = "pure_content";
 static const char ENTRY_TITLE[] = "title";
+static const char ENTRY_CREATED_AT[] = "created_at";
 
 struct Entry {
   std::string id;
@@ -32,4 +35,5 @@ struct Entry {
   std::string url;
   std::string pure_content;
   std::string title;
+  boost::posix_time::ptime timestamp;
 };

train-rank/src/knowledgebase_api.cpp

@@ -3,15 +3,37 @@
 #include <cpprest/json.h>
 
 #include <optional>
+#include <iostream>
 #include <chrono>
 #include <thread>
 
 #include "easylogging++.h"
 
+#include <boost/date_time.hpp>
+
 using namespace web::json;
 
+using std::string;
+using std::unordered_map;
+using std::vector;
+
 namespace knowledgebase {
 
+namespace {
+
+boost::posix_time::ptime parse_time(string& timestamp_str) {
+    timestamp_str[10] = ' ';
+    timestamp_str.pop_back();  // remove the last 'Z'
+
+    try {
+        return boost::posix_time::time_from_string(timestamp_str);
+    } catch (boost::bad_lexical_cast& e) {
+        LOG(ERROR) << "Failed to convert timestamp " << timestamp_str << ", Reason: " << e.what();
+        return boost::posix_time::ptime(boost::gregorian::date(1970, 1, 1));
+    }
+}
+
+}  // namespace
 EntryCache::EntryCache():cache_miss(0), cache_hit(0) {
 }
 
@@ -20,62 +42,31 @@ EntryCache& EntryCache::getInstance() {
     return instance;
 }
 
+void EntryCache::init() {
+    loadAllEntries();
+}
+
 std::optional<Entry> EntryCache::getEntryById(const std::string& id) {
     if (cache.find(id) != cache.end()) {
         ++cache_hit;
         return std::make_optional(cache[id]);
     }
+    auto result = GetEntryById(id);
+    if (result != std::nullopt) {
+        ++cache_hit;
+        cache[id] = result.value();
+        return result;
+    }
     ++cache_miss;
+    return std::nullopt;
+}
 
-    http_client client(U(std::getenv("KNOWLEDGE_BASE_API_URL")));
-        std::string current_entry_api_suffix =
-        std::string(ENTRY_API_SUFFIX) + "/" + id;
-
-    LOG(DEBUG) << "current_entry_api_suffix " << current_entry_api_suffix
-                 << std::endl;
-
-    uri_builder builder(U(current_entry_api_suffix));
-
-    // Impression current_impression;
-    std::optional<Entry> option_entry = std::nullopt;
-
-    client.request(methods::GET, builder.to_string())
-            .then([](http_response response) -> pplx::task<web::json::value> {
-            if (response.status_code() == status_codes::OK) {
-              return response.extract_json();
-            }
-            return pplx::task_from_result(web::json::value());
-          })
-          .then([&option_entry](pplx::task<web::json::value> previousTask) {
-            try {
-              web::json::value const &v = previousTask.get();
-              int code = v.at("code").as_integer();
-              std::string message = "null";
-              if (v.has_string_field("message")) {
-                message = v.at("message").as_string();
-              }
-              LOG(DEBUG) << "code " << code << " message " << message << std::endl;
-              if (code == 0) {
-                web::json::value current_value = v.at("data");
-                option_entry = convertFromWebJsonValueToEntry(current_value);
-              }
-            } catch (http_exception const &e) {
-              LOG(ERROR) << "Error exception " << e.what() << std::endl;
-            }
-          })
-          .wait();
-
-    if (option_entry.has_value()) {
-        cache[id] = option_entry.value();
-    }
-    return option_entry;
+void EntryCache::loadAllEntries() {
+    cache = getEntries(FLAGS_recommend_source_name);
 }
 
 void EntryCache::dumpStatistics() {
     LOG(INFO) << "Cache hit: " << cache_hit << ", miss: " << cache_miss << endl;
-    for (auto& pr : cache) {
-        LOG(INFO) << pr.first << endl;
-    }
 }
 
 bool updateAlgorithmScoreAndMetadata(
@@ -330,6 +321,15 @@ std::optional<Entry> convertFromWebJsonValueToEntry(
     return std::nullopt;
   }
 
+  if (current_item.has_string_field(ENTRY_CREATED_AT)) {
+    auto timestamp_str = current_item.at(ENTRY_CREATED_AT).as_string();
+    temp_entry.timestamp = parse_time(timestamp_str);
+  } else {
+    LOG(ERROR) << "current web json value have no " << ENTRY_CREATED_AT
+               << std::endl;
+    return std::nullopt;
+  }
+
   return std::make_optional(temp_entry);
 }
 
@@ -825,6 +825,77 @@ std::optional<Entry> GetEntryById(const std::string &id) {
   return option_entry;
 }
 
+unordered_map<string, Entry> getEntries(const string& source) {
+    unordered_map<string, Entry> result;
+    int offset = 0, count = 0, limit = 100;
+    do {
+        vector<Entry> entry_list;
+        getEntries(limit, offset, source, &entry_list, &count);
+        for (auto& entry : entry_list) {
+            result.emplace(entry.id, std::move(entry));
+        }
+        offset += limit;
+    } while (result.size() < count);
+    return result;
+}
+
+void getEntries(int limit, int offset, const string& source,
+                std::vector<Entry> *entry_list,  int *count) {
+    entry_list->clear();
+    http_client client(U(std::getenv("KNOWLEDGE_BASE_API_URL")));
+    std::string current_suffix =
+        std::string(ENTRY_API_SUFFIX) + "?offset=" + std::to_string(offset)
+        + "&limit=" + std::to_string(limit) + "&source=" + source + "&extract=true"
+        + "&fields=id,file_type,language,url,title,readlater,crawler,starred,disabled,saved,unread,extract,created_at";
+    LOG(DEBUG) << "current_suffix " << current_suffix
+               << std::endl;
+
+    bool success = false;
+    while (!success) {
+        client.request(methods::GET, U(current_suffix))
+            .then([](http_response response) -> pplx::task<web::json::value> {
+                if (response.status_code() == status_codes::OK) {
+                    return response.extract_json();
+                }
+                return pplx::task_from_result(web::json::value());
+            })
+            .then([&](pplx::task<web::json::value> previousTask) {
+                try {
+                    web::json::value const &v = previousTask.get();
+                    int code = v.at("code").as_integer();
+                    std::string message = "null";
+                    if (v.has_string_field("message")) {
+                        message = v.at("message").as_string();
+                    }
+                    LOG(DEBUG) << "code " << code << " message " << message << std::endl;
+                    if (code == 0) {
+                        web::json::value data_value = v.at("data");
+                        web::json::value items = data_value.at("items");
+                        *count = data_value.at("count").as_integer();
+                        for (auto iter = items.as_array().cbegin(); iter != items.as_array().cend(); ++iter) {
+                            auto item = convertFromWebJsonValueToEntry(*iter);
+                            if (item == std::nullopt) {
+                                continue;
+                            }
+                            entry_list->push_back(item.value());
+                        }
+                    }
+                    success = true;
+                } catch (http_exception const &e) {
+                    LOG(ERROR) << "Error exception " << e.what() << std::endl;
+                }
+            })
+            .wait();
+
+       if (!success) {
+           std::this_thread::sleep_for(std::chrono::milliseconds(1000));
+           LOG(INFO) << "getEntries retrying..." << std::endl;
+       } else {
+           LOG(INFO) << "getEntries succeed." << std::endl;
+       }
+    }
+}
+
 std::optional<Algorithm> GetAlgorithmById(const std::string &id) {
   /**
    * @brief

train-rank/src/knowledgebase_api.h

@@ -2,6 +2,9 @@
 #include <string>
 #include <unordered_map>
 #include <vector>
+
+#include <gflags/gflags.h>
+
 using std::cerr;
 using std::endl;
 
@@ -15,12 +18,16 @@ using namespace web::http::client;
 #include "entity/rank_algorithm.h"
 #include "entity/reco_metadata.h"
 
+DECLARE_string(recommend_source_name);
+
 namespace knowledgebase {
 
 class EntryCache {
 public:
     static EntryCache& getInstance();
+    void init();
     std::optional<Entry> getEntryById(const std::string& id);
+    void loadAllEntries();
 
     void dumpStatistics();
 
@@ -63,6 +70,10 @@ void getAllAlgorithmAccordingRanked(std::string source,
                                     bool ranked, int* count);
 std::optional<Algorithm> GetAlgorithmById(const std::string& id);
 std::optional<Entry> GetEntryById(const std::string& id);
+std::unordered_map<std::string, Entry> getEntries(const std::string& source);
+std::unordered_map<std::string, Entry> getEntries(const std::string& source);
+void getEntries(int limit, int offset, const std::string& source,
+                std::vector<Entry> *entry_list,  int *count);
 bool updateKnowledgeConfig(const std::string& source, const std::string& key,
                            const web::json::value& value);
 bool updateLastRankTime(std::string source, int64_t last_rank_time);

train-rank/src/lr/feature_extractor.cpp

@@ -44,14 +44,14 @@ double EmbeddingDistanceExtractor::extract(const Impression& item) {
     if (!item.embedding.has_value()) {
         return 0.0;
     }
-    return extract(Item(item.id, item.embedding.value()));
+    return extract(Item(item.entry_id, item.embedding.value()));
 }
 
 double EmbeddingDistanceExtractor::extract(const Algorithm& item) {
     if (!item.embedding.has_value()) {
         return 0.0;
     }
-    return extract(Item(item.id, item.embedding.value()));
+    return extract(Item(item.entry, item.embedding.value()));
 }
 
 double EmbeddingDistanceExtractor::extract(const Item& item) {
@@ -64,7 +64,7 @@ double EmbeddingDistanceExtractor::extract(const Item& item) {
         minNegCos = std::max(minNegCos, embeddingCosine(neg.embedding, item.embedding));
     }
     // TODO(haochengwang): Optimize me
-    return minPosCos;
+    return minPosCos + 1.0;
 }
 
 Reason EmbeddingDistanceExtractor::getReason(const Algorithm& item) {

train-rank/src/lr/feature_extractor.h

@@ -26,7 +26,8 @@ class EmbeddingDistanceExtractor : public FeatureExtractor {
     struct Item {
         std::string id;
         std::vector<double> embedding;
-        Item(std::string id, const std::vector<double>& embedding): id(id), embedding(embedding) {}
+        Item(std::string id, const std::vector<double>& embedding):
+                id(id), embedding(embedding) {}
     };
     EmbeddingDistanceExtractor();