add slot record dataset

paddle/fluid/framework/channel.h

@@ -157,7 +157,19 @@ class ChannelObject {
     p.resize(finished);
     return finished;
   }
+  // read once only
+  size_t ReadOnce(std::vector<T>& p, size_t size) {  // NOLINT
+    if (size == 0) {
+      return 0;
+    }
+    std::unique_lock<std::mutex> lock(mutex_);
+    p.resize(size);
+    size_t finished = Read(size, &p[0], lock, true);
+    p.resize(finished);
+    Notify();
 
+    return finished;
+  }
   size_t ReadAll(std::vector<T>& p) {  // NOLINT
     p.clear();
     size_t finished = 0;
@@ -241,17 +253,21 @@ class ChannelObject {
     return !closed_;
   }
 
-  size_t Read(size_t n, T* p, std::unique_lock<std::mutex>& lock) {  // NOLINT
+  size_t Read(size_t n, T* p, std::unique_lock<std::mutex>& lock,  // NOLINT
+              bool once = false) {                                 // NOLINT
     size_t finished = 0;
     CHECK(n <= MaxCapacity() - reading_count_);
     reading_count_ += n;
     while (finished < n && WaitForRead(lock)) {
-      size_t m = std::min(n - finished, data_.size());
+      size_t m = (std::min)(n - finished, data_.size());
       for (size_t i = 0; i < m; i++) {
         p[finished++] = std::move(data_.front());
         data_.pop_front();
       }
       reading_count_ -= m;
+      if (once && m > 0) {
+        break;
+      }
     }
     reading_count_ -= n - finished;
     return finished;

paddle/fluid/framework/data_feed.cc

@@ -36,6 +36,107 @@ DLManager& global_dlmanager_pool() {
   return manager;
 }
 
+class BufferedLineFileReader {
+  typedef std::function<bool()> SampleFunc;
+  static const int MAX_FILE_BUFF_SIZE = 4 * 1024 * 1024;
+  class FILEReader {
+   public:
+    explicit FILEReader(FILE* fp) : fp_(fp) {}
+    int read(char* buf, int len) { return fread(buf, sizeof(char), len, fp_); }
+
+   private:
+    FILE* fp_;
+  };
+
+ public:
+  typedef std::function<bool(const std::string&)> LineFunc;
+
+ private:
+  template <typename T>
+  int read_lines(T* reader, LineFunc func, int skip_lines) {
+    int lines = 0;
+    size_t ret = 0;
+    char* ptr = NULL;
+    char* eol = NULL;
+    total_len_ = 0;
+    error_line_ = 0;
+
+    SampleFunc spfunc = get_sample_func();
+    std::string x;
+    while (!is_error() && (ret = reader->read(buff_, MAX_FILE_BUFF_SIZE)) > 0) {
+      total_len_ += ret;
+      ptr = buff_;
+      eol = reinterpret_cast<char*>(memchr(ptr, '\n', ret));
+      while (eol != NULL) {
+        int size = static_cast<int>((eol - ptr) + 1);
+        x.append(ptr, size - 1);
+        ++lines;
+        if (lines > skip_lines && spfunc()) {
+          if (!func(x)) {
+            ++error_line_;
+          }
+        }
+
+        x.clear();
+        ptr += size;
+        ret -= size;
+        eol = reinterpret_cast<char*>(memchr(ptr, '\n', ret));
+      }
+      if (ret > 0) {
+        x.append(ptr, ret);
+      }
+    }
+    if (!is_error() && !x.empty()) {
+      ++lines;
+      if (lines > skip_lines && spfunc()) {
+        if (!func(x)) {
+          ++error_line_;
+        }
+      }
+    }
+    return lines;
+  }
+
+ public:
+  BufferedLineFileReader()
+      : random_engine_(std::random_device()()),
+        uniform_distribution_(0.0f, 1.0f) {
+    total_len_ = 0;
+    sample_line_ = 0;
+    buff_ =
+        reinterpret_cast<char*>(calloc(MAX_FILE_BUFF_SIZE + 1, sizeof(char)));
+  }
+  ~BufferedLineFileReader() { free(buff_); }
+
+  int read_file(FILE* fp, LineFunc func, int skip_lines) {
+    FILEReader reader(fp);
+    return read_lines<FILEReader>(&reader, func, skip_lines);
+  }
+  uint64_t file_size(void) { return total_len_; }
+  void set_sample_rate(float r) { sample_rate_ = r; }
+  size_t get_sample_line() { return sample_line_; }
+  bool is_error(void) { return (error_line_ > 10); }
+
+ private:
+  SampleFunc get_sample_func() {
+    if (std::abs(sample_rate_ - 1.0f) < 1e-5f) {
+      return [this](void) { return true; };
+    }
+    return [this](void) {
+      return (uniform_distribution_(random_engine_) < sample_rate_);
+    };
+  }
+
+ private:
+  char* buff_ = nullptr;
+  uint64_t total_len_ = 0;
+
+  std::default_random_engine random_engine_;
+  std::uniform_real_distribution<float> uniform_distribution_;
+  float sample_rate_ = 1.0f;
+  size_t sample_line_ = 0;
+  size_t error_line_ = 0;
+};
 void RecordCandidateList::ReSize(size_t length) {
   mutex_.lock();
   capacity_ = length;
@@ -301,7 +402,7 @@ int InMemoryDataFeed<T>::Next() {
               << ", thread_id=" << thread_id_;
     }
   } else {
-    VLOG(3) << "enable heter NEXT: " << offset_index_
+    VLOG(3) << "enable heter next: " << offset_index_
             << " batch_offsets: " << batch_offsets_.size();
     if (offset_index_ >= batch_offsets_.size()) {
       VLOG(3) << "offset_index: " << offset_index_
@@ -318,14 +419,7 @@ int InMemoryDataFeed<T>::Next() {
       VLOG(3) << "finish reading for heterps, batch size zero, thread_id="
               << thread_id_;
     }
-    /*
-    if (offset_index_ == batch_offsets_.size() - 1) {
-      std::vector<Record> data;
-      output_channel_->ReadAll(data);
-      consume_channel_->Write(std::move(data));
-    }
-    */
-    VLOG(3) << "#15 enable heter NEXT: " << offset_index_
+    VLOG(3) << "enable heter next: " << offset_index_
             << " batch_offsets: " << batch_offsets_.size()
             << " baych_size: " << this->batch_size_;
   }