Add rpc ops to fetch data from remote service (#50220)

.pre-commit-config.yaml

@@ -18,6 +18,10 @@ repos:
     rev: v4.1.0
     hooks:
     -   id: check-added-large-files
+        exclude: |
+            (?x)^(
+                paddle/fluid/operators/collective/thirdparty/json.h
+            )$
     -   id: check-merge-conflict
     -   id: check-symlinks
     -   id: detect-private-key
@@ -35,7 +39,8 @@ repos:
         files: \.(c|cc|cxx|cpp|cu|h|hpp|hxx|xpu|kps)$
         exclude: |
             (?x)^(
-                paddle/fluid/distributed/ps/thirdparty/round_robin.h
+                paddle/fluid/distributed/ps/thirdparty/round_robin.h|
+                paddle/fluid/operators/collective/thirdparty/json.h
             )$
 -   repo: local
     hooks:
@@ -62,7 +67,8 @@ repos:
         files: \.(c|cc|cxx|cpp|cu|h|hpp|hxx|proto|xpu|kps|py|sh)$
         exclude: |
             (?x)^(
-                paddle/utils/.*
+                paddle/utils/.*|
+                paddle/fluid/operators/collective/thirdparty/json.h
             )$
 -   repo: local
     hooks:

cmake/generic.cmake

@@ -96,7 +96,7 @@ if(NOT APPLE AND NOT WIN32)
   link_libraries(${CMAKE_THREAD_LIBS_INIT})
   if(WITH_PSLIB OR WITH_DISTRIBUTE)
     set(CMAKE_CXX_LINK_EXECUTABLE
-        "${CMAKE_CXX_LINK_EXECUTABLE} -pthread -ldl -lrt -lz -lssl")
+        "${CMAKE_CXX_LINK_EXECUTABLE} -pthread -ldl -lrt -lz -lssl -lcrypto")
   else()
     set(CMAKE_CXX_LINK_EXECUTABLE
         "${CMAKE_CXX_LINK_EXECUTABLE} -pthread -ldl -lrt")

cmake/third_party.cmake

@@ -424,6 +424,18 @@ if(WITH_PSCORE)
   list(APPEND third_party_deps extern_rocksdb)
 endif()
 
+if(WITH_DISTRIBUTE
+   AND NOT WITH_PSLIB
+   AND NOT WITH_PSCORE)
+  include(external/snappy)
+  list(APPEND third_party_deps extern_snappy)
+
+  include(external/leveldb)
+  list(APPEND third_party_deps extern_leveldb)
+  include(external/brpc)
+  list(APPEND third_party_deps extern_brpc)
+endif()
+
 if(WITH_XBYAK)
   include(external/xbyak) # download, build, install xbyak
   list(APPEND third_party_deps extern_xbyak)

paddle/fluid/distributed/CMakeLists.txt

 add_subdirectory(auto_parallel)
 add_subdirectory(collective)
 add_subdirectory(store)
+add_subdirectory(fleet_executor)
 if(WITH_PYTHON)
   py_proto_compile(ps_py_proto SRCS the_one_ps.proto)
   add_custom_target(
@@ -29,7 +30,6 @@ if(WITH_PYTHON)
 endif()
 
 if(NOT WITH_PSCORE)
-  add_subdirectory(fleet_executor)
   return()
 endif()
 
@@ -47,4 +47,3 @@ add_subdirectory(common)
 add_subdirectory(ps)
 add_subdirectory(test)
 add_subdirectory(index_dataset)
-add_subdirectory(fleet_executor)

paddle/fluid/distributed/fleet_executor/CMakeLists.txt

@@ -6,7 +6,7 @@ proto_library(interceptor_message_proto SRCS interceptor_message.proto)
 
 if(WITH_ARM_BRPC)
   set(BRPC_DEPS arm_brpc snappy gflags glog)
-elseif(WITH_DISTRIBUTE AND WITH_PSCORE)
+elseif(WITH_DISTRIBUTE)
   set(BRPC_DEPS
       brpc
       ssl

paddle/fluid/distributed/fleet_executor/message_bus.cc

@@ -73,7 +73,7 @@ bool MessageBus::IsInit() const { return is_init_; }
 
 MessageBus::~MessageBus() {
   VLOG(3) << "Message bus releases resource.";
-#if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE)
+#if defined(PADDLE_WITH_DISTRIBUTE)
   server_.Stop(1000);
   server_.Join();
 #endif
@@ -94,7 +94,7 @@ bool MessageBus::Send(int64_t dst_rank,
       true,
       platform::errors::PreconditionNotMet(
           "Using message bus since it has not been initialized."));
-#if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE)
+#if defined(PADDLE_WITH_DISTRIBUTE)
   int retry_time = 0;  // message bus will retry sending for 10 times
   while (retry_time < 10) {
     ++retry_time;
@@ -179,7 +179,7 @@ void MessageBus::ListenPort() {
     LOG(INFO) << "No need listen to port since training on single card.";
     return;
   }
-#if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE)
+#if defined(PADDLE_WITH_DISTRIBUTE)
   // function keep listen the port and handle the message
   PADDLE_ENFORCE_EQ(
       server_.AddService(&message_service_, brpc::SERVER_DOESNT_OWN_SERVICE),
@@ -209,7 +209,7 @@ void MessageBus::ListenPort() {
 #endif
 }
 
-#if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE)
+#if defined(PADDLE_WITH_DISTRIBUTE)
 bool MessageBus::SendInterRank(int64_t dst_rank,
                                const InterceptorMessage& interceptor_message) {
   const auto& dst_addr = GetAddr(dst_rank);

paddle/fluid/distributed/fleet_executor/message_bus.h

@@ -20,7 +20,7 @@
 #include <thread>
 #include <unordered_map>
 
-#if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE)
+#if defined(PADDLE_WITH_DISTRIBUTE)
 #include "brpc/channel.h"
 #include "brpc/server.h"
 #include "paddle/fluid/distributed/fleet_executor/message_service.h"
@@ -63,7 +63,7 @@ class MessageBus final {
 
   const std::string& GetAddr(int64_t rank) const;
 
-#if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE)
+#if defined(PADDLE_WITH_DISTRIBUTE)
   // send the message inter rank (dst is different rank with src)
   bool SendInterRank(int64_t dst_rank,
                      const InterceptorMessage& interceptor_message);
@@ -79,7 +79,7 @@ class MessageBus final {
   // the ip needs to be listened
   std::string addr_;
 
-#if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE)
+#if defined(PADDLE_WITH_DISTRIBUTE)
   MessageServiceImpl message_service_;
   // brpc server
   brpc::Server server_;

paddle/fluid/distributed/fleet_executor/message_service.cc

@@ -11,7 +11,7 @@
 // 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.
-#if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE)
+#if defined(PADDLE_WITH_DISTRIBUTE)
 #include "paddle/fluid/distributed/fleet_executor/message_service.h"
 
 #include "brpc/server.h"

paddle/fluid/distributed/fleet_executor/message_service.h

@@ -11,7 +11,7 @@
 // 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.
-#if defined(PADDLE_WITH_DISTRIBUTE) && defined(PADDLE_WITH_PSCORE)
+#if defined(PADDLE_WITH_DISTRIBUTE)
 #pragma once
 
 #include "brpc/server.h"

paddle/fluid/distributed/fleet_executor/test/CMakeLists.txt

@@ -59,9 +59,7 @@ cc_test(
        scope
        device_context)
 
-if(WITH_DISTRIBUTE
-   AND WITH_PSCORE
-   AND NOT (WITH_ASCEND OR WITH_ASCEND_CL))
+if(WITH_DISTRIBUTE AND NOT (WITH_ASCEND OR WITH_ASCEND_CL))
   set_source_files_properties(
     interceptor_ping_pong_with_brpc_test.cc
     PROPERTIES COMPILE_FLAGS ${DISTRIBUTE_COMPILE_FLAGS})

paddle/fluid/framework/CMakeLists.txt

@@ -584,16 +584,18 @@ if(WITH_PYTHON)
               ${PADDLE_BINARY_DIR}/python/paddle/distributed/fleet/proto
       COMMENT "Copy generated python proto into directory paddle/fluid/proto."
       WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-    add_custom_target(
-      fleet_executor_proto_init ALL
-      DEPENDS fleet_proto_init fleet_executor_desc_py_proto
-      COMMAND
-        cp
-        ${PADDLE_BINARY_DIR}/paddle/fluid/distributed/fleet_executor/fleet_executor_*.py
-        ${PADDLE_BINARY_DIR}/python/paddle/distributed/fleet/proto
-      COMMENT
-        "Copy generated python proto into directory paddle/distributed/fleet/proto."
-    )
+    if(NOT WITH_ROCM)
+      add_custom_target(
+        fleet_executor_proto_init ALL
+        DEPENDS fleet_proto_init fleet_executor_desc_py_proto
+        COMMAND
+          cp
+          ${PADDLE_BINARY_DIR}/paddle/fluid/distributed/fleet_executor/fleet_executor_*.py
+          ${PADDLE_BINARY_DIR}/python/paddle/distributed/fleet/proto
+        COMMENT
+          "Copy generated python proto into directory paddle/distributed/fleet/proto."
+      )
+    endif()
   else()
     string(REPLACE "/" "\\" proto_dstpath
                    "${PADDLE_BINARY_DIR}/python/paddle/fluid/proto/")

paddle/fluid/operators/collective/CMakeLists.txt

@@ -30,9 +30,16 @@ register_operators(
   c_gen_hccl_id_op
   gen_hccl_id_op
   c_gen_cncl_id_op
+  rpc_call_op
+  rpc_result_op
   DEPS
   ${COLLECTIVE_DEPS})
 
+if(WITH_DISTRIBUTE)
+  op_library(rpc_call_op DEPS rpc_utils ${COLLECTIVE_DEPS})
+  op_library(rpc_result_op DEPS rpc_utils ${COLLECTIVE_DEPS})
+endif()
+
 if(WITH_NCCL OR WITH_RCCL)
   set(COLLECTIVE_DEPS ${COLLECTIVE_DEPS} nccl_common collective_helper)
   op_library(c_gen_nccl_id_op DEPS ${COLLECTIVE_DEPS})

paddle/fluid/operators/collective/rpc_call_op.cc

+// Copyright (c) 2023 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/operators/collective/rpc_call_op.h"
+
+#include "paddle/fluid/framework/op_proto_maker.h"
+#include "paddle/fluid/framework/op_registry.h"
+
+namespace paddle {
+namespace operators {
+
+class RpcCallOp : public framework::OperatorWithKernel {
+ public:
+  using framework::OperatorWithKernel::OperatorWithKernel;
+
+  void InferShape(framework::InferShapeContext* ctx) const override {}
+
+ protected:
+  framework::OpKernelType GetExpectedKernelType(
+      const framework::ExecutionContext& ctx) const override {
+    auto dtype = OperatorWithKernel::IndicateVarDataType(ctx, "X");
+    return framework::OpKernelType(dtype, ctx.GetPlace());
+  }
+};
+
+class RpcCallOpMaker : public framework::OpProtoAndCheckerMaker {
+ public:
+  void Make() {
+    AddInput("X", "(Tensor) Src words' ids.");
+    AddOutput("Out", "(Tensor) Request id.");
+    AddAttr<std::string>("url", "URL.").SetDefault({});
+    AddAttr<std::string>("vocab_path", "Vocab's absolute path.").SetDefault("");
+    AddAttr<bool>("use_ids", "If true, use ids directly.").SetDefault(true);
+    AddAttr<int>("timeout", "rpc connection timeout ms").SetDefault(3000);
+    AddAttr<int>("retry", "rpc connection retry time").SetDefault(100);
+    AddComment(R"DOC(
+Rpc Call Operator
+
+)DOC");
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle
+
+namespace ops = paddle::operators;
+
+REGISTER_OP_WITHOUT_GRADIENT(rpc_call, ops::RpcCallOp, ops::RpcCallOpMaker);
+
+REGISTER_OP_CPU_KERNEL(rpc_call,
+                       ops::RpcCallOpKernel<int>,
+                       ops::RpcCallOpKernel<int64_t>);
+
+REGISTER_OP_CUDA_KERNEL(rpc_call,
+                        ops::RpcCallOpKernel<int>,
+                        ops::RpcCallOpKernel<int64_t>);

paddle/fluid/operators/collective/rpc_call_op.h

+// Copyright (c) 2023 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 <brpc/channel.h>
+
+#include <fstream>
+#include <memory>
+#include <string>
+
+#include "paddle/fluid/framework/operator.h"
+#include "paddle/fluid/framework/tensor_util.h"
+#include "paddle/fluid/operators/collective/thirdparty/json.h"
+#include "paddle/fluid/platform/rpc_utils.h"
+#include "paddle/phi/core/enforce.h"
+#include "paddle/phi/core/errors.h"
+
+namespace paddle {
+namespace operators {
+
+#define DATA_STRLIST 0
+/*
+{"data": ["你好"]}
+*/
+#define TEXT_STR 1
+/*
+{"text": "nihao"}
+*/
+using json = nlohmann::json;
+
+// payload builders
+template <typename T = int64_t>
+static inline std::string BuildIdsPayload(const std::vector<T>& src_ids) {
+  json payload = {{"ids", src_ids}};  // => {"ids": [1, 2, 3, ...]}
+  return payload.dump();
+}
+
+static inline std::string BuildStrPayload(const std::string& query,
+                                          int build_way) {
+  json payload;
+  switch (build_way) {
+    case DATA_STRLIST:
+      payload = {{"data", {query}}};  //=> {"data": [query]}
+      break;
+    case TEXT_STR:
+      payload = {{"text", query}};  //=> {"text": query}
+      break;
+    default:
+      break;
+  }
+
+  return payload.dump();
+}
+
+template <typename T = int64_t>
+static inline std::string BuildPayload(const std::string& service,
+                                       const std::vector<T>& src_ids) {
+  if (service == "ids") {
+    return BuildIdsPayload(src_ids);
+  } else if (service == "str") {
+    const std::string query =
+        platform::RpcTokenizer::Instance().GetWordsFromIds(src_ids);
+    return BuildStrPayload(query, TEXT_STR);
+  } else {
+    PADDLE_THROW(platform::errors::InvalidArgument("Unknown service."));
+  }
+}
+
+// req & res handlers
+static inline void HandleServiceRequest(brpc::Controller* ctrl,
+                                        int request_id,
+                                        const std::string& payload) {
+  ctrl->request_attachment().append(payload);
+  VLOG(3) << "Request id " << request_id << "payload size:" << payload.size();
+  VLOG(3) << "Request id " << request_id << " payload: " << payload;
+}
+
+static inline void HandleServiceResponse(
+    brpc::Controller* ctrl,
+    int request_id,
+    std::shared_ptr<bthread::CountdownEvent> event) {
+  // make sure the controller will be deleted
+  std::unique_ptr<brpc::Controller> ctrl_guard(ctrl);
+  auto& rpc_store = platform::RpcRequestStore::Instance();
+  if (ctrl->Failed()) {
+    rpc_store.InsertErrorCode(request_id, ctrl->ErrorCode());
+    PADDLE_THROW(platform::errors::Unavailable(
+        "Request id %s failed: access url error. error code: %d, http code: %d",
+        request_id,
+        ctrl->ErrorCode(),
+        ctrl->http_response().status_code()));
+  } else {
+    const std::string res = ctrl->response_attachment().to_string();
+    rpc_store.InsertErrorCode(request_id, 0);
+    rpc_store.InsertResponse(request_id, res);
+  }
+  // try to notify result op
+  event->signal();
+}
+
+static int send_sequence(const framework::ExecutionContext& ctx,
+                         const std::string& service,
+                         const phi::DenseTensor& src_ids_tensor,
+                         const std::string& url,
+                         const int& timeout = 3000,
+                         const int& retry = 100) {
+  std::vector<int> src_ids_vec;
+  framework::TensorToVector(src_ids_tensor, ctx.device_context(), &src_ids_vec);
+  const std::string payload = BuildPayload(service, src_ids_vec);
+  int request_id =
+      platform::RpcCommContext::RpcSend(url,
+                                        payload,
+                                        &HandleServiceRequest,
+                                        &HandleServiceResponse,
+                                        brpc::HttpMethod::HTTP_METHOD_POST,
+                                        timeout,
+                                        retry);
+  VLOG(3) << "Request id " << request_id << " url: " << url;
+  VLOG(3) << "Request id " << request_id << " payload: " << payload;
+  return request_id;
+}
+
+template <typename T>
+class RpcCallOpKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    // url, assume num of urls is limited
+
+    const std::string url = ctx.Attr<std::string>("url");
+
+    // payload
+    auto src_ids_tensor = ctx.Input<phi::DenseTensor>("X");
+    auto x_dims = src_ids_tensor->dims();
+
+    PADDLE_ENFORCE_EQ(
+        x_dims.size(),
+        2,
+        platform::errors::PreconditionNotMet(
+            "The input src ids' dim size must be 2. However the dim is %d",
+            x_dims.size()));
+
+    std::vector<int> request_ids(x_dims[0]);
+
+    bool use_ids = ctx.Attr<bool>("use_ids");
+    std::string service;
+    if (use_ids) {
+      service = "ids";
+    } else {
+      // init tokenizer
+      auto vocab_path = ctx.Attr<std::string>("vocab_path");
+      std::unordered_map<std::string, std::string> special;
+      platform::RpcTokenizer::Instance().Init(vocab_path, special);
+      service = "str";
+    }
+
+    int timeout = ctx.Attr<int>("timeout");
+    int retry = ctx.Attr<int>("retry");
+
+    for (auto i = 0; i < x_dims[0]; i++) {
+      request_ids[i] = send_sequence(
+          ctx, service, src_ids_tensor->Slice(i, i + 1), url, timeout, retry);
+    }
+
+    auto* out = ctx.Output<phi::DenseTensor>("Out");
+    out->Resize({static_cast<int64_t>(request_ids.size())});
+    ctx.device_context().Alloc<int>(out);
+    framework::TensorFromVector(request_ids, ctx.device_context(), out);
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle

paddle/fluid/operators/collective/rpc_result_op.cc

+// Copyright (c) 2023 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/operators/collective/rpc_result_op.h"
+
+#include "paddle/fluid/framework/op_proto_maker.h"
+
+namespace paddle {
+namespace operators {
+
+class RpcResultOp : public framework::OperatorWithKernel {
+ public:
+  using framework::OperatorWithKernel::OperatorWithKernel;
+
+  void InferShape(framework::InferShapeContext* ctx) const override {}
+
+ protected:
+  framework::OpKernelType GetExpectedKernelType(
+      const framework::ExecutionContext& ctx) const override {
+    auto dtype = OperatorWithKernel::IndicateVarDataType(ctx, "X");
+    return framework::OpKernelType(dtype, ctx.GetPlace());
+  }
+};
+
+class RpcResultOpMaker : public framework::OpProtoAndCheckerMaker {
+ public:
+  void Make() {
+    AddInput("X", "(Tensor) Request id.");
+    AddOutput("Out", "(Tensor) Response from service.");
+    AddOutput("succeed", "Request status, true means succeed.");
+    AddAttr<std::string>("res_type", "Result type returns.")
+        .SetDefault("float");
+    AddComment(R"DOC(
+Rpc Result Operator
+
+)DOC");
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle
+
+namespace ops = paddle::operators;
+
+REGISTER_OP_WITHOUT_GRADIENT(rpc_result,
+                             ops::RpcResultOp,
+                             ops::RpcResultOpMaker);
+
+REGISTER_OP_CPU_KERNEL(rpc_result, ops::RpcResultOpKernel<int>);
+
+REGISTER_OP_CUDA_KERNEL(rpc_result, ops::RpcResultOpKernel<int>);

paddle/fluid/operators/collective/rpc_result_op.h

+// Copyright (c) 2023 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 <string>
+
+#include "paddle/fluid/framework/op_registry.h"
+#include "paddle/fluid/framework/operator.h"
+#include "paddle/fluid/framework/tensor_util.h"
+#include "paddle/fluid/operators/collective/thirdparty/json.h"
+#include "paddle/fluid/platform/device_context.h"
+#include "paddle/fluid/platform/rpc_utils.h"
+
+namespace paddle {
+namespace operators {
+
+using json = nlohmann::json;
+
+#define PARSE_DIRECT_FLOAT 0
+/*
+1.23
+*/
+#define PARSE_RESULT_FLOAT 1
+/*
+{"result": ["1.23"]}
+*/
+
+static inline std::vector<float> ParseFloatResponse(const std::string& response,
+                                                    int parse_way) {
+  auto obj = json::parse(response);
+  switch (parse_way) {
+    case PARSE_RESULT_FLOAT: {
+      auto res = obj["result"][0].get<std::string>();
+      return {std::stof(res, nullptr)};
+    }
+    case PARSE_DIRECT_FLOAT:
+      return {obj.get<float>()};
+    default:
+      break;
+  }
+  return {static_cast<float>(0)};
+}
+
+static inline std::vector<uint8_t> ParseStrResponse(
+    const std::string& response) {
+  const std::string res = json::parse(response).dump();
+  return std::vector<uint8_t>(res.begin(), res.end());
+}
+
+static std::vector<uint8_t> get_str_response(const int& request_id) {
+  // wait for call op's event notification
+  auto& rpc_store = platform::RpcRequestStore::Instance();
+  auto event = rpc_store.GetEvent(request_id);
+  int err_code = rpc_store.GetErrorCode(request_id);
+  bool ok = event->wait() == 0 && err_code == 0;
+  if (ok) {
+    const std::string& resp = rpc_store.GetResponse(request_id);
+    VLOG(3) << "Request id " << request_id << " raw response: " << resp;
+    VLOG(3) << "Request id " << request_id;
+
+    // auto out_ = const_cast<phi::DenseTensor&>(out);
+    auto out_vector = ParseStrResponse(resp);
+    return out_vector;
+  } else {
+    PADDLE_THROW(platform::errors::Unavailable(
+        "Request %s failed with error code %s.", request_id, err_code));
+  }
+}
+
+static std::vector<float> get_float_response(const int& request_id) {
+  // wait for call op's event notification
+  auto& rpc_store = platform::RpcRequestStore::Instance();
+  auto event = rpc_store.GetEvent(request_id);
+  int err_code = rpc_store.GetErrorCode(request_id);
+  bool ok = event->wait() == 0 && err_code == 0;
+  if (ok) {
+    const std::string& resp = rpc_store.GetResponse(request_id);
+    VLOG(3) << "Request id " << request_id << " raw response: " << resp;
+    VLOG(3) << "Request id " << request_id;
+
+    // auto out_ = const_cast<phi::DenseTensor&>(out);
+    auto out_vector = ParseFloatResponse(resp, PARSE_RESULT_FLOAT);
+    return out_vector;
+  } else {
+    PADDLE_THROW(platform::errors::Unavailable(
+        "Request %s failed with error code %s.", request_id, err_code));
+  }
+}
+
+template <typename T>
+class RpcResultOpKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    auto* request_id_tensor = ctx.Input<phi::DenseTensor>("X");
+    std::vector<int> request_id_tensor_vec;
+    framework::TensorToVector(
+        *request_id_tensor, ctx.device_context(), &request_id_tensor_vec);
+
+    auto* out = ctx.Output<phi::DenseTensor>("Out");
+    const std::string res_type = ctx.Attr<std::string>("res_type");
+
+    VLOG(3) << "out dims: " << out->dims().to_str()
+            << "numel: " << out->numel();
+    if (res_type == "str") {
+      ctx.device_context().Alloc<uint8_t>(out);
+    } else if (res_type == "float") {
+      ctx.device_context().Alloc<float>(out);
+    } else {
+      PADDLE_THROW(platform::errors::InvalidArgument(
+          "Unknown result type. error type: %s", res_type.c_str()));
+    }
+    VLOG(3) << "out dims: " << out->dims().to_str();
+    std::vector<std::vector<uint8_t>> uint8_vec;
+    std::vector<std::vector<float>> float_vec;
+    int64_t max_size = -1;
+
+    for (auto i = 0; i < request_id_tensor->dims()[0]; i++) {
+      if (res_type == "float") {
+        auto vec = get_float_response(request_id_tensor_vec[i]);
+        max_size = std::max(max_size, static_cast<int64_t>(vec.size()));
+        float_vec.emplace_back(vec);
+      } else if (res_type == "str") {
+        auto vec = get_str_response(request_id_tensor_vec[i]);
+        uint8_vec.emplace_back(vec);
+        max_size = std::max(max_size, static_cast<int64_t>(vec.size()));
+        PADDLE_ENFORCE_LE(
+            max_size,
+            100 * 1024 * 1024,
+            platform::errors::Unavailable("to many string data, exceed 100MB"));
+      }
+    }
+
+    out->Resize({request_id_tensor->dims()[0], max_size});
+
+    if (res_type == "str") {
+      ctx.device_context().Alloc<uint8_t>(out);
+      for (size_t i = 0; i < uint8_vec.size(); i++) {
+        phi::DenseTensor out_ = out->Slice(i, i + 1);
+        for (int k = uint8_vec[i].size(); k < max_size; k++) {
+          uint8_vec[i].emplace_back(static_cast<uint8_t>(0));
+        }
+        framework::TensorFromVector(uint8_vec[i], ctx.device_context(), &out_);
+      }
+    } else if (res_type == "float") {
+      ctx.device_context().Alloc<float>(out);
+      for (size_t i = 0; i < float_vec.size(); i++) {
+        phi::DenseTensor out_ = out->Slice(i, i + 1);
+        framework::TensorFromVector(float_vec[i], ctx.device_context(), &out_);
+      }
+    }
+
+    auto* succeed = ctx.Output<phi::DenseTensor>("succeed");
+    ctx.device_context().Alloc<bool>(succeed);
+    std::vector<bool> succeed_wrapper{true};
+    framework::TensorFromVector(succeed_wrapper, ctx.device_context(), succeed);
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle

paddle/fluid/platform/CMakeLists.txt

@@ -223,6 +223,24 @@ cc_library(
        phi_device_context
        generator)
 
+if(WITH_DISTRIBUTE)
+  set(BRPC_DEPS
+      brpc
+      ssl
+      crypto
+      protobuf
+      zlib
+      leveldb
+      snappy
+      gflags
+      glog)
+
+  cc_library(
+    rpc_utils
+    SRCS rpc_utils.cc
+    DEPS enforce ${BRPC_DEPS})
+endif()
+
 cc_library(
   collective_helper
   SRCS collective_helper.cc gen_comm_id_helper.cc

paddle/fluid/platform/rpc_utils.cc

+// Copyright (c) 2023 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/platform/rpc_utils.h"
+
+#include <algorithm>
+#include <fstream>
+#include <regex>
+#include <sstream>
+#include <unordered_set>
+
+#include "paddle/phi/core/enforce.h"
+#include "paddle/phi/core/errors.h"
+
+namespace paddle {
+namespace platform {
+
+// globals
+static std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> converter;
+
+// utils
+static inline bool StartsWith(const std::string& str,
+                              const std::string& prefix) {
+  return str.substr(0, prefix.length()) == prefix;
+}
+
+static inline bool EndsWith(const std::string& str, const std::string& suffix) {
+  return str.length() >= suffix.length() &&
+         str.substr(str.length() - suffix.length()) == suffix;
+}
+
+static inline std::string Replace(const std::string& str,
+                                  const std::string& old_str,
+                                  const std::string& new_str) {
+  if (old_str == new_str) {
+    return str;
+  }
+  std::stringstream ss;
+  size_t start_pos = 0;
+  size_t pos = str.find(old_str, start_pos);
+  while (pos != std::string::npos) {
+    ss << str.substr(start_pos, pos - start_pos) << new_str;
+    start_pos = pos + old_str.size();
+    pos = str.find(old_str, start_pos);
+  }
+  ss << str.substr(start_pos);
+  return ss.str();
+}
+
+static inline bool IsChineseChar(wchar_t c) {
+  return (c >= 0x4E00 && c <= 0x9FFF) || (c >= 0x3400 && c <= 0x4DBF) ||
+         (c >= 0x20000 && c <= 0x2A6DF) || (c >= 0x2A700 && c <= 0x2B73F) ||
+         (c >= 0x2B740 && c <= 0x2B81F) || (c >= 0x2B820 && c <= 0x2CEAF) ||
+         (c >= 0xF900 && c <= 0xFAFF) || (c >= 0x2F800 && c <= 0x2FA1F);
+}
+
+static inline bool IsChinesePunct(wchar_t c) {
+  std::unordered_set<wchar_t> puncts = {
+      L'！', L'？', L'｡',  L'。', L'＂', L'＃', L'＄', L'％', L'＆', L'＇',
+      L'（', L'）', L'＊', L'＋', L'，', L'－', L'／', L'：', L'；', L'＜',
+      L'＝', L'＞', L'＠', L'［', L'＼', L'］', L'＾', L'＿', L'｀', L'｛',
+      L'｜', L'｝', L'～', L'｟', L'｠', L'｢',  L'｣',  L'､',  L'、', L'〃',
+      L'》', L'「', L'」', L'『', L'』', L'【', L'】', L'〔', L'〕', L'〖',
+      L'〗', L'〘', L'〙', L'〚', L'〛', L'〜', L'〝', L'〞', L'〟', L'〰',
+      L'〾', L'〿',  L'–',  L'—',  L'“',  L'”',  L'‘',  L'’'};
+  return puncts.count(c);
+}
+
+static inline int GetCharBytes(uint8_t byte) {
+  if ((byte & 0x80) == 0) {
+    return 1;
+  } else if ((byte & 0xE0) == 0xC0) {
+    return 2;
+  } else if ((byte & 0xF0) == 0xE0) {
+    return 3;
+  } else if ((byte & 0xF8) == 0xF0) {
+    return 4;
+  } else {
+    return -1;
+  }
+}
+
+static inline bool IsValidContinuationByte(uint8_t byte) {
+  // check if the byte starts with 10
+  return (byte & 0xC0) == 0x80;
+}
+
+static inline uint8_t GetByteFromHex(const std::string& token) {
+  auto num_str = paddle::string::split_string(token, "_")[1];
+  num_str = num_str.substr(0, num_str.size() - 1);
+  return static_cast<uint8_t>(std::stoi(num_str, nullptr, 16));
+}
+
+// RpcTokenizer
+void RpcTokenizer::Init(const std::string& path) {
+  if (path_ == path) {
+    return;
+  }
+  std::ifstream vocab_file(path);
+  std::string word;
+  int id;
+  while (vocab_file >> word >> id) {
+    ids_to_words_.emplace(id, word);
+    words_to_ids_.emplace(converter.from_bytes(word), id);
+  }
+
+  // update members
+  path_ = path;
+}
+
+void RpcTokenizer::Init(
+    const std::string& path,
+    const std::unordered_map<std::string, std::string>& special_set) {
+  if (path_ == path) {
+    return;
+  }
+  Init(path);
+  SetSpecialSet(special_set);
+}
+
+std::string RpcTokenizer::GetRecoveredToken(const std::vector<uint8_t>& bytes) {
+  std::string res;
+  int n = bytes.size();
+  int i = 0;
+  while (i < n) {
+    int sz = 0;
+    while ((sz = GetCharBytes(bytes[i])) == -1) {
+      ++i;
+    }
+    if (i + sz < n) {
+      std::vector<uint8_t> valid_bytes;
+      valid_bytes.emplace_back(bytes[i]);
+      for (int j = 1; j < sz; ++j) {
+        if (!IsValidContinuationByte(bytes[i])) {
+          break;
+        }
+        valid_bytes.emplace_back(bytes[i]);
+        ++i;
+      }
+      if (valid_bytes.size() == static_cast<size_t>(sz)) {
+        res += std::string(valid_bytes.begin(), valid_bytes.end());
+      }
+    }
+    ++i;
+  }
+  return res;
+}
+
+std::vector<std::string> RpcTokenizer::RecoverBFBTokens(
+    const std::vector<std::string>& tokens) {
+  std::vector<std::string> new_tokens;
+  std::vector<uint8_t> tmp_bytes;
+  for (const auto& token : tokens) {
+    if (StartsWith(token, "[BFB")) {
+      tmp_bytes.emplace_back(GetByteFromHex(token));
+    } else {
+      if (!tmp_bytes.empty()) {
+        // since there may be illegal bytes, we need this function
+        // if all bytes are legal, we can simply use string constructor
+        const std::string recovered_token = GetRecoveredToken(tmp_bytes);
+        if (!recovered_token.empty()) {
+          new_tokens.emplace_back(recovered_token);
+        }
+      }
+      if (token != "[UNK]") {
+        new_tokens.emplace_back(token);
+      }
+      tmp_bytes.clear();
+    }
+  }
+  if (!tmp_bytes.empty()) {
+    const std::string recovered_token = GetRecoveredToken(tmp_bytes);
+    if (!recovered_token.empty()) {
+      new_tokens.emplace_back(recovered_token);
+    }
+  }
+  return new_tokens;
+}
+
+std::vector<std::string> RpcTokenizer::PostProcess(
+    const std::vector<std::string>& tokens,
+    const WordToIdMap& vocab,
+    bool aggressive_break,
+    const std::string& stop_token) {
+  std::unordered_set<std::string> break_words;
+  if (aggressive_break) {
+    break_words = {"[END]", "[gEND]", "[<S>]", "[UNK]", "[CLS]"};
+  } else {
+    break_words = {"[END]", "[gEND]"};
+  }
+  static const std::unordered_map<std::string, std::string> replace_words{
+      {"[<S>]", " "},
+      {"[<N>]", "\n"},
+      {"[<T>]", "\t"},
+      {"[<t>]", "  "},
+  };
+
+  std::vector<std::string> new_text;
+  auto words = RecoverBFBTokens(tokens);
+  for (auto& word : words) {
+    if (break_words.count(word) || word == stop_token) {
+      break;
+    }
+    if (word.empty() || word == "[PAD]") {
+      continue;
+    }
+    if (replace_words.count(word)) {
+      new_text.emplace_back(replace_words.at(word));
+      continue;
+    }
+
+    auto unicode_word = converter.from_bytes(word);
+    bool is_chinese_char = IsChineseChar(unicode_word[0]);
+    bool is_chinese_punct = IsChinesePunct(unicode_word[0]);
+
+    if (is_chinese_char || is_chinese_punct || vocab.count(unicode_word) == 0) {
+      if (!new_text.empty() && EndsWith(new_text.back(), "@@")) {
+        auto& last_word = new_text.back();
+        last_word = Replace(last_word, "@@", "");
+      }
+      new_text.emplace_back(word);
+    } else if (!StartsWith(word, "##")) {
+      if (!new_text.empty() && EndsWith(new_text.back(), "@@")) {
+        auto& last_word = new_text.back();
+        last_word = Replace(last_word, "@@", "");
+        new_text.emplace_back(word);
+      } else if (!new_text.empty() && EndsWith(new_text.back(), "\n")) {
+        new_text.emplace_back(word);
+      } else {
+        if (!new_text.empty() && !new_text.back().empty() &&
+            IsChineseChar(converter.from_bytes(new_text.back())[0])) {
+          new_text.emplace_back(word);
+        } else {
+          if (!new_text.empty()) {
+            new_text.emplace_back(" ");
+          }
+          new_text.emplace_back(word);
+        }
+      }
+    } else {
+      if (!new_text.empty() && EndsWith(new_text.back(), "@@")) {
+        auto& last_word = new_text.back();
+        last_word = last_word.substr(0, last_word.size() - 2);
+      }
+      new_text.emplace_back(Replace(word, "##", ""));
+    }
+  }
+
+  if (!new_text.empty()) {
+    auto& last_word = new_text.back();
+    last_word = Replace(last_word, "@@", "");
+  }
+
+  return new_text;
+}
+
+int RpcCommContext::RpcSend(
+    const std::string& url,
+    const std::string& query,
+    void (*request_handler)(brpc::Controller*, int, const std::string&),
+    void (*response_handler)(brpc::Controller*,
+                             int,
+                             std::shared_ptr<bthread::CountdownEvent>),
+    brpc::HttpMethod http_method,
+    int timeout_ms,
+    int max_retry) {
+  brpc::Channel channel;
+  brpc::ChannelOptions options;
+  options.protocol = "http";
+  options.timeout_ms = timeout_ms;
+  options.max_retry = max_retry;
+  PADDLE_ENFORCE_EQ(
+      channel.Init(url.c_str(), /*load_balancer*/ "", &options),
+      0,
+      phi::errors::Unavailable("Rpc send failed: init brpc channel error."));
+
+  auto& rpc_store = RpcRequestStore::Instance();
+  int request_id = rpc_store.GetRequestId();
+
+  auto event = std::make_shared<bthread::CountdownEvent>();
+  RpcRequestStore::Instance().InsertEvent(request_id, event);
+
+  // if req is async, controller should be on heap to avoid deleting
+  auto* ctrl = new brpc::Controller();
+  ctrl->http_request().uri() = url.c_str();
+  ctrl->http_request().set_method(http_method);
+  ctrl->http_request().SetHeader("Content-Type", "application/json");
+  request_handler(ctrl, request_id, query);
+
+  channel.CallMethod(
+      nullptr,
+      ctrl,
+      nullptr,
+      nullptr,
+      brpc::NewCallback(response_handler, ctrl, request_id, event));
+
+  return request_id;
+}
+
+}  // namespace platform
+}  // namespace paddle

paddle/fluid/platform/rpc_utils.h

+// Copyright (c) 2023 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 <brpc/channel.h>
+#include <bthread/countdown_event.h>
+
+#include <atomic>
+#include <codecvt>
+#include <locale>
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+#include "paddle/utils/string/string_helper.h"
+
+namespace paddle {
+namespace platform {
+
+using WordToIdMap = std::unordered_map<std::wstring, int64_t>;
+using IdToWordMap = std::unordered_map<int64_t, std::string>;
+
+class RpcTokenizer {
+ public:
+  static RpcTokenizer& Instance() {
+    static RpcTokenizer instance;
+    return instance;
+  }
+
+  void Init(const std::string& path);
+
+  void Init(const std::string& path,
+            const std::unordered_map<std::string, std::string>& special_set);
+
+  void SetSpecialSet(
+      const std::unordered_map<std::string, std::string>& special_set) {
+    special_set_ = special_set;
+  }
+
+  bool Contains(int64_t id) { return ids_to_words_.count(id) > 0; }
+
+  // NOTE: an exception will be raised if id not exist
+  std::string GetWordFromId(int64_t id) {
+    auto q = ids_to_words_.at(id);
+    if (special_set_.count(q) == 1) {
+      return special_set_.at(q);
+    } else {
+      return q;
+    }
+  }
+
+  template <typename T = int64_t>
+  std::string GetWordsFromIds(const std::vector<T>& ids,
+                              bool aggressive_break = false,
+                              const std::string& stop_token = "[gEND]") {
+    std::vector<std::string> tokens;
+    for (auto id : ids) {
+      if (!Contains(id)) {
+        continue;
+      }
+      tokens.emplace_back(GetWordFromId(id));
+    }
+    return paddle::string::join_strings(
+        PostProcess(tokens, words_to_ids_, aggressive_break, stop_token), "");
+  }
+
+  // NOTE: an exception will be raised if word not exist
+  int64_t GetIdFromWord(const std::wstring& word) {
+    return words_to_ids_.at(word);
+  }
+
+ private:
+  std::string GetRecoveredToken(const std::vector<uint8_t>& bytes);
+
+  std::vector<std::string> RecoverBFBTokens(
+      const std::vector<std::string>& tokens);
+
+  std::vector<std::string> PostProcess(
+      const std::vector<std::string>& tokens,
+      const WordToIdMap& vocab,
+      bool aggressive_break = false,
+      const std::string& stop_token = "[gEND]");
+
+ private:
+  std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> converter_;
+
+  std::string path_;
+  IdToWordMap ids_to_words_;
+  WordToIdMap words_to_ids_;
+  std::unordered_map<std::string, std::string> special_set_;
+};
+
+class RpcRequestStore {
+ public:
+  static RpcRequestStore& Instance() {
+    static RpcRequestStore instance;
+    return instance;
+  }
+
+  int GetRequestId() {
+    if (request_id_ == INT32_MAX) {
+      request_id_ = 0;
+    } else {
+      ++request_id_;
+    }
+    return request_id_;
+  }
+
+  std::shared_ptr<bthread::CountdownEvent> GetEvent(int request_id) {
+    return id_to_event_map_[request_id];
+  }
+
+  int GetErrorCode(int request_id) { return id_to_err_map_[request_id]; }
+
+  std::string GetResponse(int request_id) {
+    return id_to_resp_map_[request_id];
+  }
+
+  void InsertEvent(int request_id,
+                   const std::shared_ptr<bthread::CountdownEvent>& event) {
+    if (request_id == 0) {
+      LOG(WARNING) << "Total num of requests have exceeded int limits.";
+    }
+    id_to_event_map_.emplace(request_id, event);
+  }
+
+  void InsertErrorCode(int request_id, int error_code) {
+    if (request_id == 0) {
+      LOG(WARNING) << "Total num of requests have exceeded int limits.";
+    }
+    id_to_err_map_.emplace(request_id, error_code);
+  }
+
+  void InsertResponse(int request_id, const std::string& resp) {
+    if (request_id == 0) {
+      LOG(WARNING) << "Total num of requests have exceeded int limits.";
+    }
+    id_to_resp_map_.emplace(request_id, resp);
+  }
+
+ private:
+  std::atomic<int> request_id_;
+
+  std::unordered_map<int, std::shared_ptr<bthread::CountdownEvent>>
+      id_to_event_map_;
+  std::unordered_map<int, int> id_to_err_map_;
+  std::unordered_map<int, std::string> id_to_resp_map_;
+};
+
+struct RpcCommContext {
+  static int RpcSend(
+      const std::string& url,
+      const std::string& query,
+      void (*request_handler)(brpc::Controller*, int, const std::string&),
+      void (*response_handler)(brpc::Controller*,
+                               int,
+                               std::shared_ptr<bthread::CountdownEvent>),
+      brpc::HttpMethod http_method = brpc::HttpMethod::HTTP_METHOD_POST,
+      int timeout_ms = 10000,
+      int max_retry = 3);
+};
+
+}  // namespace platform
+}  // namespace paddle

python/paddle/fluid/tests/unittests/collective/CMakeLists.txt

@@ -379,5 +379,16 @@ if((WITH_ROCM OR WITH_GPU) AND (LINUX))
     "PADDLE_DIST_UT_PORT=21532;http_proxy=;https_proxy=")
   set_tests_properties(test_world_size_and_rank PROPERTIES TIMEOUT "120")
 endif()
+if((WITH_ROCM OR WITH_GPU) AND (LINUX))
+  bash_test_modules(
+    test_rpc_call_result
+    START_BASH
+    test_rpc_call_result.sh
+    LABELS
+    "RUN_TYPE=DIST"
+    ENVS
+    "PADDLE_DIST_UT_PORT=21672;http_proxy=;https_proxy=")
+  set_tests_properties(test_rpc_call_result PROPERTIES TIMEOUT "120")
+endif()
 add_subdirectory(fleet)
 add_subdirectory(multinode)

python/paddle/fluid/tests/unittests/collective/py_server_test.py

+# Copyright (c) 2023 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.
+
+from flask import Flask, request, jsonify
+import argparse
+
+app = Flask(__name__)
+test_value = 0.66943359375
+
+
+@app.route('/run/predict', methods=['POST'])
+def echo():
+    # Get the data from the request
+    request_json = request.json
+    # data = request_json['text']
+
+    # Echo the data back in the response
+    response = {'result': [str(test_value)]}
+
+    # Return the response in JSON format
+    return jsonify(response)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--port', type=int, required=True, help='port')
+    parser.add_argument(
+        '--ip', type=str, required=False, default='localhost', help='ip'
+    )
+    args = parser.parse_args()
+    app.run(host=args.ip, port=args.port)

python/paddle/fluid/tests/unittests/collective/test_rpc_call_result.py

+# Copyright (c) 2023 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.
+
+import paddle
+import paddle.fluid as fluid
+import numpy as np
+import subprocess
+import unittest
+import os
+
+
+def rpc_test(use_ids, out_type, url):
+    paddle.enable_static()
+
+    MAX_SIZE_QUERY = 18
+    RES_TYPE = out_type
+
+    with open("vocab.txt", "w") as voc:
+        voc.write("ABC 0\n")
+        voc.write("EFG 1\n")
+        voc.write("HIG 2\n")
+        voc.write("[<S>] 3\n")
+        voc.write("[<N>] 4\n")
+        voc.write("[<t>] 5\n")
+        voc.write("[<T>] 6\n")
+        voc.write("##good 7\n")
+        voc.write("bad@@ 8\n")
+        voc.write("@@badok 9\n")
+        voc.write("你好 10\n")
+        voc.write("haha 11\n")
+        voc.write("##haha@@ 12\n")
+        voc.write("[PAD] 13\n")
+        voc.write("[gEnd] 14\n")
+
+    # network
+    in_query = fluid.data(name='X', shape=[-1, MAX_SIZE_QUERY], dtype='int32')
+
+    req_ids = paddle.static.nn.rpc_call(
+        in_query,
+        url,
+        "vocab.txt",
+        use_ids,
+    )
+
+    out_data, out_succeed = paddle.static.nn.rpc_result(req_ids, RES_TYPE)
+    paddle.static.Print(in_query)
+    paddle.static.Print(req_ids)
+    paddle.static.Print(out_data.astype("float32"))
+
+    query_tensor = np.array(
+        [
+            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0, 1, 2],
+            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 0, 1, 2, 14],
+        ]
+    ).astype("int32")
+
+    # run
+    exe = fluid.Executor(fluid.CUDAPlace(0))
+    exe.run(fluid.default_startup_program())
+
+    for _ in range(1):
+        succeed, data, = exe.run(
+            fluid.default_main_program(),
+            feed={
+                'X': query_tensor,
+            },
+            fetch_list=[out_succeed, out_data],
+        )
+    if out_type == "str":
+        print(data[0].tobytes().decode("utf-8", "ignore"))
+    else:
+        print(data[0])
+
+
+class RPCCallTest(unittest.TestCase):
+    def test_cases(self):
+        ip = 'localhost'
+        port = int(os.environ.get("PADDLE_DIST_UT_PORT"))
+
+        server_cmd = f"python py_server_test.py --ip {ip} --port {port}"
+        with open(f"server.{port}.log", "w") as output:
+            process = subprocess.Popen(
+                server_cmd.split(), stdout=output, stderr=output
+            )
+
+        for uid in [True, False]:
+            for otype in ['str', 'float']:
+                try:
+                    rpc_test(uid, otype, f"http://{ip}:{port}/run/predict")
+                except:
+                    process.kill()
+                    raise RuntimeError("rpc test error")
+
+
+if __name__ == "__main__":
+    unittest.main()

python/paddle/fluid/tests/unittests/collective/test_rpc_call_result.sh

+# Copyright (c) 2023 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.
+
+python test_rpc_call_result.py

python/paddle/fluid/tests/unittests/collective/testslist.csv

@@ -45,3 +45,4 @@ test_eager_dist_api,linux,gpu;rocm,120,DIST,test_runner.py,2,,http_proxy=;https_
 test_gen_nccl_id_op,,gpu;rocm;ASCEND;ASCEND_CL,,DIST,../dist_test.sh,2,,http_proxy=;https_proxy=;PYTHONPATH=..,
 test_new_group_api,linux,gpu;rocm,120,DIST,test_runner.py,2,,http_proxy=;https_proxy=;PYTHONPATH=..,
 test_world_size_and_rank,linux,rocm;gpu,120,DIST,test_world_size_and_rank.sh,2,,http_proxy=;https_proxy=,
+test_rpc_call_result,linux,rocm;gpu,120,DIST,test_rpc_call_result.sh,1,,http_proxy=;https_proxy=,

python/paddle/static/nn/__init__.py

@@ -59,7 +59,9 @@ from ...fluid.layers.sequence_lod import sequence_scatter  # noqa: F401
 from ...fluid.layers.sequence_lod import sequence_enumerate  # noqa: F401
 from ...fluid.layers.sequence_lod import sequence_reverse  # noqa: F401
 
-__all__ = [  #noqa
+from .rpc_utils import rpc_call, rpc_result
+
+__all__ = [  # noqa
     'fc',
     'batch_norm',
     'embedding',
@@ -101,4 +103,6 @@ __all__ = [  #noqa
     'sequence_enumerate',
     'sequence_reverse',
     'StaticRNN',
+    'rpc_call',
+    'rpc_result',
 ]

python/paddle/static/nn/rpc_utils.py

+# Copyright (c) 2023 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.
+
+from paddle import fluid
+import paddle
+
+
+class IDGen:
+    def __init__(self) -> None:
+        self.ids = {}
+
+    def gen_name_with_idx(self, name):
+        if name not in self.ids:
+            self.ids[name] = -1
+        self.ids[name] += 1
+        return name + "_" + str(self.ids[name])
+
+    def __call__(self, name) -> str:
+        return self.gen_name_with_idx(name)
+
+
+id_gen = IDGen()
+
+
+def rpc_call(src_ids=None, url="", voc_path="", cvt2str=True):
+    request_id = (
+        fluid.default_main_program()
+        .block(0)
+        .create_var(
+            name=id_gen("rpc_request_id"),
+            dtype="int32",
+            shape=[src_ids.shape[0]],
+            persistable=False,
+            stop_gradient=True,
+        )
+    )
+    src_ids = src_ids.astype("int32")
+
+    fluid.default_main_program().block(0).append_op(
+        type="rpc_call",
+        inputs={
+            'X': [src_ids],
+        },
+        outputs={"Out": [request_id]},
+        attrs={
+            "url": url,
+            "vocab_path": voc_path,
+            "use_ids": not cvt2str,
+            "timeout": 3000,
+            "retry": 100,
+        },
+    )
+    return request_id
+
+
+def rpc_result(request_ids, result_dtype):
+    if result_dtype == "float":
+        res = (
+            fluid.default_main_program()
+            .block(0)
+            .create_var(
+                name=id_gen("rpc_res"),
+                dtype="float32",
+                shape=[request_ids.shape[0]],
+                persistable=False,
+                stop_gradient=True,
+            )
+        )
+    elif result_dtype == "str":
+        res = (
+            fluid.default_main_program()
+            .block(0)
+            .create_var(
+                name=id_gen("rpc_res"),
+                dtype="uint8",
+                shape=[request_ids.shape[0]],
+                persistable=False,
+                stop_gradient=True,
+            )
+        )
+    else:
+        raise ValueError("result dtype must be one of str ot float")
+
+    success = (
+        fluid.default_main_program()
+        .block(0)
+        .create_var(
+            name=id_gen("rpc_success"),
+            dtype="bool",
+            shape=[1],
+            persistable=False,
+            stop_gradient=True,
+        )
+    )
+    fluid.default_main_program().block(0).append_op(
+        type="rpc_result",
+        inputs={"X": [request_ids]},
+        outputs={"Out": [res], "succeed": [success]},
+        attrs={"res_type": result_dtype},
+    )
+    return res, success

python/paddle/tensor/stat.py

@@ -175,8 +175,8 @@ def var(x, axis=None, unbiased=True, keepdim=False, name=None):
     out = paddle.sum((x - u) ** 2, axis, keepdim=keepdim, name=name)
 
     dtype = x.dtype
-    n = paddle.cast(paddle.numel(x), paddle.int64) / paddle.cast(
-        paddle.numel(out), paddle.int64
+    n = paddle.cast(paddle.numel(x), dtype) / paddle.cast(
+        paddle.numel(out), dtype
     )
     n = n.astype(dtype)
     if unbiased:

tools/codestyle/cpplint_pre_commit.hook

@@ -21,7 +21,8 @@ else
 fi
 # The trick to remove deleted files: https://stackoverflow.com/a/2413151
 for file in $files; do
-    if [[ $file =~ ^(patches/.*) ]]; then
+    echo $file
+    if [[ $file =~ ^(patches/.*) || $file =~ ^(paddle/fluid/operators/collective/thirdparty/json.h) ]]; then
         continue;
     else
         cpplint --filter=-readability/fn_size,-build/include_what_you_use,-build/c++11,-whitespace/parens $file;