PaddlePaddle
diff --git a/‎paddle/fluid/pybind/generator_py.cc
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+12-11Lines changed: 12 additions & 11 deletions b/‎paddle/fluid/pybind/generator_py.cc
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+12-11Lines changed: 12 additions & 11 deletions
diff --git a/‎paddle/phi/core/generator.cc
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+78-86Lines changed: 78 additions & 86 deletions b/‎paddle/phi/core/generator.cc
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+78-86Lines changed: 78 additions & 86 deletions
@@ -38,37 +38,35 @@ void BindGenerator(py::module* m_ptr) {
                                                               "GeneratorState")
       .def("current_seed",
            [](std::shared_ptr<phi::Generator::GeneratorState>& self) {
-             return self->current_seed;
+             return self->seed;
            })
 #if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP) || \
     defined(PADDLE_WITH_CUSTOM_DEVICE) || defined(PADDLE_WITH_XPU)
       // NOTE(shenliang03): Due to the inability to serialize mt19937_64
       // type, resulting in a problem with precision under the cpu.
       .def(py::pickle(
           [](const phi::Generator::GeneratorState& s) {  // __getstate__
-            return py::make_tuple(s.device, s.current_seed, s.thread_offset);
+            return py::make_tuple(s.device, s.seed, s.offset);
           },
           [](py::tuple s) {  // __setstate__
             if (s.size() != 3)
               throw std::runtime_error(
                   "Invalid Random state. Please check the format(device, "
                   "current_seed, thread_offset).");
 
-            phi::Generator::GeneratorState state;
-            state.device = s[0].cast<std::int64_t>();
-            state.current_seed = s[1].cast<std::uint64_t>();
-            state.thread_offset = s[2].cast<std::uint64_t>();
+            int64_t device = s[0].cast<int64_t>();
+            int64_t seed = s[1].cast<int64_t>();
+            uint64_t offset = s[2].cast<uint64_t>();
+
+            phi::Generator::GeneratorState state(device, seed, offset);
 
-            std::seed_seq seq({state.current_seed});
-            auto engine = std::make_shared<std::mt19937_64>(seq);
-            state.cpu_engine = *engine;
             return state;
           }))
 #endif
       .def("__str__", [](const phi::Generator::GeneratorState& self) {
         std::stringstream ostr;
-        ostr << self.device << " " << self.current_seed << " "
-             << self.thread_offset << " " << self.cpu_engine;
+        ostr << self.device << " " << self.seed << " " << self.offset << " "
+             << self.cpu_engine;
         return ostr.str();
       });
 
@@ -78,6 +76,9 @@ void BindGenerator(py::module* m_ptr) {
            [](phi::Generator& self) { new (&self) phi::Generator(); })
       .def("get_state", &phi::Generator::GetState)
       .def("set_state", &phi::Generator::SetState)
+      .def("get_state_index", &phi::Generator::GetStateIndex)
+      .def("set_state_index", &phi::Generator::SetStateIndex)
+      .def("register_state_index", &phi::Generator::RegisterStateIndex)
       .def("manual_seed",
            [](std::shared_ptr<phi::Generator>& self, uint64_t seed) {
              self->SetCurrentSeed(seed);
 
@@ -16,6 +16,7 @@ limitations under the License. */
 
 #include <glog/logging.h>
 
+#include <cstdint>
 #include <memory>
 #include <utility>
 
@@ -157,134 +158,125 @@ const std::shared_ptr<Generator>& GetRandomSeedGenerator(
 // RandomGenerator.
 std::shared_ptr<std::mt19937_64> GetCPURandomEngine(uint64_t seed) {
   if (seed == 0) {
-    VLOG(4) << "Use random engine from generator";
+    VLOG(4) << "Use random cpu_engine from generator";
     return DefaultCPUGenerator()->GetCPUEngine();
   } else {
-    // NOTE(zhiqiu): creating an engine instance everytime instead of using
+    // NOTE(zhiqiu): creating an cpu_engine instance everytime instead of using
     // OpDefaultCPUEngine(), this is the legacy behavior of random operators.
     // The benefit is that when runing PE with fixed-seed in multiple thrads,
-    // each thread has their own engine, and doesn't affect each other.
+    // each thread has their own cpu_engine, and doesn't affect each other.
     //
     // And we need to measure the determinacy of Generator in PE.
-    auto engine = std::make_shared<std::mt19937_64>();
+    auto cpu_engine = std::make_shared<std::mt19937_64>();
     static std::mutex mu_;
     {
       std::lock_guard<std::mutex> lock(mu_);
-      engine->seed(seed);
+      cpu_engine->seed(seed);
     }
-    return engine;
+    return cpu_engine;
   }
 }
 
+inline void Generator::print_state_info() {
+  VLOG(4) << "Generator Random state "
+          << "device id: " << state().device << ", seed: " << state().seed
+          << ", offset: " << state().offset << ", cpu_engine: " << cpu_engine();
+}
+
 Generator::Generator() {
   auto seed = GetRandomSeed();
-  std::seed_seq seq({seed});
-  auto engine = std::make_shared<std::mt19937_64>(seq);
-  this->state_.cpu_engine = *engine;
-  this->state_.device = -1;
-  this->state_.current_seed = seed;
-  this->state_.thread_offset = 0;
-  this->engine_ = engine;
-  VLOG(4) << "initial seed: " << this->state_.current_seed
-          << ", cpu engine: " << &this->state_.cpu_engine;
+  current_index = states_.size();
+  states_.emplace_back(-1, seed);
+  print_state_info();
 }
 
 Generator::Generator(uint64_t seed) {
-  std::seed_seq seq({seed});
-  auto engine = std::make_shared<std::mt19937_64>(seq);
-  this->state_.cpu_engine = *engine;
-  this->state_.device = -1;
-  this->state_.current_seed = seed;
-  this->state_.thread_offset = 0;
-  this->engine_ = engine;
-  VLOG(4) << "initial seed: " << this->state_.current_seed
-          << ", cpu engine: " << &this->state_.cpu_engine;
+  current_index = states_.size();
+  states_.emplace_back(-1, seed);
+  print_state_info();
 }
 
-Generator::Generator(uint64_t seed, uint64_t device_id) {
-  std::seed_seq seq({seed});
-  auto engine = std::make_shared<std::mt19937_64>(seq);
-  this->state_.cpu_engine = *engine;
-  this->state_.device = static_cast<int64_t>(device_id);
-  this->state_.current_seed = seed;
-  this->state_.thread_offset = 0;
-  this->engine_ = engine;
-  VLOG(4) << "initial seed: " << this->state_.current_seed
-          << ", cpu engine: " << &this->state_.cpu_engine;
+Generator::Generator(uint64_t seed, int64_t device_id) {
+  current_index = states_.size();
+  // device id first, then seed
+  states_.emplace_back(device_id, seed);
+  print_state_info();
 }
 
-phi::Generator::GeneratorState Generator::GetState() {
-  std::lock_guard<std::mutex> lock(this->mu_);
-  state_.cpu_engine = *engine_;
-  VLOG(4) << "Get Random state: "
-          << "device id: " << (uint64_t)(this->state_.device)
-          << ", current_seed: " << this->state_.current_seed
-          << ", thread_offset: " << this->state_.thread_offset
-          << ", cpu engine: " << *(this->engine_);
-  return this->state_;
-}
+phi::Generator::GeneratorState Generator::GetState() { return state(); }
 
 void Generator::SetState(const phi::Generator::GeneratorState& state) {
-  std::lock_guard<std::mutex> lock(this->mu_);
-  this->state_ = state;
-  this->engine_ = std::make_shared<std::mt19937_64>(state.cpu_engine);
-  VLOG(4) << "Set Random state: "
-          << "device id: " << (uint64_t)(this->state_.device)
-          << ", current_seed: " << this->state_.current_seed
-          << ", thread_offset: " << this->state_.thread_offset
-          << ", cpu engine: " << *(this->engine_);
+  std::lock_guard<std::mutex> lock(mu_);
+  if (current_index < states_.size())
+    states_[current_index] = state;
+  else
+    PADDLE_THROW(phi::errors::NotFound("Generator index is not found"));
+  print_state_info();
+}
+
+uint64_t Generator::GetStateIndex() { return current_index; }
+
+void Generator::SetStateIndex(uint64_t StateIndex) {
+  std::lock_guard<std::mutex> lock(mu_);
+  if (current_index < states_.size())
+    current_index = StateIndex;
+  else
+    PADDLE_THROW(phi::errors::NotFound("Generator index is not found"));
+}
+
+uint64_t Generator::RegisterStateIndex(const GeneratorState& state) {
+  std::lock_guard<std::mutex> lock(mu_);
+  auto new_index = states_.size();
+  states_.push_back(state);
+  current_index = new_index;
+  return new_index;
+}
+
+inline Generator::GeneratorState& Generator::state() {
+  if (current_index < states_.size())
+    return states_[current_index];
+  else
+    PADDLE_THROW(phi::errors::NotFound("Generator index is not found"));
+}
+
+inline std::shared_ptr<std::mt19937_64> Generator::cpu_engine() {
+  return state().cpu_engine;
 }
 
 uint64_t Generator::GetCurrentSeed() {
-  std::lock_guard<std::mutex> lock(this->mu_);
-  return this->state_.current_seed;
+  std::lock_guard<std::mutex> lock(mu_);
+  return state().seed;
 }
 
 uint64_t Generator::Seed() {
-  std::lock_guard<std::mutex> lock(this->mu_);
-  uint64_t seed = 0;
-  std::random_device de;
-  seed = ((((uint64_t)de()) << 32) + de()) & 0x1FFFFFFFFFFFFF;
-  this->state_.current_seed = seed;
-  std::seed_seq seq({seed});
-  this->engine_->seed(seq);
-
-  return this->state_.current_seed;
+  std::lock_guard<std::mutex> lock(mu_);
+  uint64_t seed = GetRandomSeed();
+  state().reset(seed);
+  return seed;
 }
 
 void Generator::SetCurrentSeed(uint64_t seed) {
-  std::lock_guard<std::mutex> lock(this->mu_);
-  this->state_.current_seed = seed;
-  this->state_.thread_offset = 0;
-  std::seed_seq seq({seed});
-  this->engine_->seed(seq);
+  std::lock_guard<std::mutex> lock(mu_);
+  state().reset(seed);
 }
 
 std::shared_ptr<std::mt19937_64> Generator::GetCPUEngine() {
-  std::lock_guard<std::mutex> lock(this->mu_);
-  return this->engine_;
-}
-
-void Generator::SetCPUEngine(std::shared_ptr<std::mt19937_64> engine) {
-  std::lock_guard<std::mutex> lock(this->mu_);
-  this->engine_ = engine;
+  return cpu_engine();
 }
 
 uint64_t Generator::Random64() {
-  std::lock_guard<std::mutex> lock(this->mu_);
-  auto engine = this->engine_;
-  return (*engine)();
+  std::lock_guard<std::mutex> lock(mu_);
+  auto current_engine = cpu_engine();
+  return (*current_engine)();
 }
 
-std::pair<uint64_t, uint64_t> Generator::IncrementOffset(
-    uint64_t increment_offset) {
+std::pair<uint64_t, uint64_t> Generator::IncrementOffset(uint64_t increment) {
 #if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)
-  std::lock_guard<std::mutex> lock(this->mu_);
-  uint64_t cur_offset = this->state_.thread_offset;
-  VLOG(10) << "cur_offset = " << cur_offset
-           << " increment_offset = " << increment_offset;
-  this->state_.thread_offset += increment_offset;
-  return std::make_pair(this->state_.current_seed, cur_offset);
+  std::lock_guard<std::mutex> lock(mu_);
+  uint64_t offset = state().offset;
+  state().offset = offset + increment;
+  print_state_info();
+  return std::make_pair(state().seed, offset);
 #else
   PADDLE_THROW(phi::errors::PermissionDenied(
       "Increment Offset only support in CUDA place"));