From b7e1a1d7e77b9613235dcf931e86bf05d14464c2 Mon Sep 17 00:00:00 2001
From: flame <fuchang01@baidu.com>
Date: Mon, 12 Aug 2019 11:26:26 +0800
Subject: [PATCH] Python inference API support numpy (#19009)

test=develop
---
 paddle/fluid/pybind/inference_api.cc | 126 ++++++++++++++++++++++++---
 1 file changed, 116 insertions(+), 10 deletions(-)

diff --git a/paddle/fluid/pybind/inference_api.cc b/paddle/fluid/pybind/inference_api.cc
index 80f316aed7..6b3b658573 100644
--- a/paddle/fluid/pybind/inference_api.cc
+++ b/paddle/fluid/pybind/inference_api.cc
@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #include "paddle/fluid/pybind/inference_api.h"
+#include <pybind11/numpy.h>
 #include <pybind11/stl.h>
 #include <cstring>
 #include <iostream>
@@ -20,6 +21,7 @@
 #include <memory>
 #include <string>
 #include <unordered_set>
+#include <utility>
 #include <vector>
 #include "paddle/fluid/inference/api/analysis_predictor.h"
 #include "paddle/fluid/inference/api/paddle_inference_api.h"
@@ -51,6 +53,81 @@ void BindAnalysisPredictor(py::module *m);
 #ifdef PADDLE_WITH_MKLDNN
 void BindMkldnnQuantizerConfig(py::module *m);
 #endif
+
+template <typename T>
+PaddleBuf PaddleBufCreate(py::array_t<T> data) {
+  PaddleBuf buf(data.size() * sizeof(T));
+  std::copy_n(static_cast<T *>(data.mutable_data()), data.size(),
+              static_cast<T *>(buf.data()));
+  return buf;
+}
+
+template <typename T>
+void PaddleBufReset(PaddleBuf &buf, py::array_t<T> data) {  // NOLINT
+  buf.Resize(data.size() * sizeof(T));
+  std::copy_n(static_cast<T *>(data.mutable_data()), data.size(),
+              static_cast<T *>(buf.data()));
+}
+
+template <typename T>
+PaddleDType PaddleTensorGetDType();
+
+template <>
+PaddleDType PaddleTensorGetDType<int32_t>() {
+  return PaddleDType::INT32;
+}
+
+template <>
+PaddleDType PaddleTensorGetDType<int64_t>() {
+  return PaddleDType::INT64;
+}
+
+template <>
+PaddleDType PaddleTensorGetDType<float>() {
+  return PaddleDType::FLOAT32;
+}
+
+template <typename T>
+PaddleTensor PaddleTensorCreate(
+    py::array_t<T> data, const std::string name = "",
+    const std::vector<std::vector<size_t>> &lod = {}, bool copy = false) {
+  PaddleTensor tensor;
+
+  if (copy) {
+    PaddleBuf buf(data.size() * sizeof(T));
+    std::copy_n(static_cast<T *>(data.mutable_data()), data.size(),
+                static_cast<T *>(buf.data()));
+    tensor.data = std::move(buf);
+  } else {
+    tensor.data = PaddleBuf(data.mutable_data(), data.size() * sizeof(T));
+  }
+
+  tensor.dtype = PaddleTensorGetDType<T>();
+  tensor.name = name;
+  tensor.lod = lod;
+  tensor.shape.resize(data.ndim());
+  std::copy_n(data.shape(), data.ndim(), tensor.shape.begin());
+
+  return tensor;
+}
+
+py::array PaddleTensorGetData(PaddleTensor &tensor) {  // NOLINT
+  py::dtype dt;
+  switch (tensor.dtype) {
+    case PaddleDType::INT32:
+      dt = py::dtype::of<int32_t>();
+      break;
+    case PaddleDType::INT64:
+      dt = py::dtype::of<int64_t>();
+      break;
+    case PaddleDType::FLOAT32:
+      dt = py::dtype::of<float>();
+      break;
+    default:
+      LOG(FATAL) << "unsupported dtype";
+  }
+  return py::array(dt, {tensor.shape}, tensor.data.data());
+}
 }  // namespace
 
 void BindInferenceApi(py::module *m) {
@@ -89,23 +166,39 @@ void BindPaddleBuf(py::module *m) {
         std::memcpy(buf.data(), static_cast<void *>(data.data()), buf.length());
         return buf;
       }))
-      .def(py::init([](std::vector<int64_t> &data) {
-        auto buf = PaddleBuf(data.size() * sizeof(int64_t));
-        std::memcpy(buf.data(), static_cast<void *>(data.data()), buf.length());
-        return buf;
-      }))
+      .def(py::init(&PaddleBufCreate<int32_t>))
+      .def(py::init(&PaddleBufCreate<int64_t>))
+      .def(py::init(&PaddleBufCreate<float>))
       .def("resize", &PaddleBuf::Resize)
       .def("reset",
            [](PaddleBuf &self, std::vector<float> &data) {
              self.Resize(data.size() * sizeof(float));
              std::memcpy(self.data(), data.data(), self.length());
            })
-      .def("reset",
-           [](PaddleBuf &self, std::vector<int64_t> &data) {
-             self.Resize(data.size() * sizeof(int64_t));
-             std::memcpy(self.data(), data.data(), self.length());
-           })
+      .def("reset", &PaddleBufReset<int32_t>)
+      .def("reset", &PaddleBufReset<int64_t>)
+      .def("reset", &PaddleBufReset<float>)
       .def("empty", &PaddleBuf::empty)
+      .def("tolist",
+           [](PaddleBuf &self, const std::string &dtype) -> py::list {
+             py::list l;
+             if (dtype == "int32") {
+               auto *data = static_cast<int32_t *>(self.data());
+               auto size = self.length() / sizeof(int32_t);
+               l = py::cast(std::vector<int32_t>(data, data + size));
+             } else if (dtype == "int64") {
+               auto *data = static_cast<int64_t *>(self.data());
+               auto size = self.length() / sizeof(int64_t);
+               l = py::cast(std::vector<int64_t>(data, data + size));
+             } else if (dtype == "float32") {
+               auto *data = static_cast<float *>(self.data());
+               auto size = self.length() / sizeof(float);
+               l = py::cast(std::vector<float>(data, data + size));
+             } else {
+               LOG(FATAL) << "unsupported dtype";
+             }
+             return l;
+           })
       .def("float_data",
            [](PaddleBuf &self) -> std::vector<float> {
              auto *data = static_cast<float *>(self.data());
@@ -127,6 +220,19 @@ void BindPaddleBuf(py::module *m) {
 void BindPaddleTensor(py::module *m) {
   py::class_<PaddleTensor>(*m, "PaddleTensor")
       .def(py::init<>())
+      .def(py::init(&PaddleTensorCreate<int32_t>), py::arg("data"),
+           py::arg("name") = "",
+           py::arg("lod") = std::vector<std::vector<size_t>>(),
+           py::arg("copy") = false)
+      .def(py::init(&PaddleTensorCreate<int64_t>), py::arg("data"),
+           py::arg("name") = "",
+           py::arg("lod") = std::vector<std::vector<size_t>>(),
+           py::arg("copy") = false)
+      .def(py::init(&PaddleTensorCreate<float>), py::arg("data"),
+           py::arg("name") = "",
+           py::arg("lod") = std::vector<std::vector<size_t>>(),
+           py::arg("copy") = false)
+      .def("as_ndarray", &PaddleTensorGetData)
       .def_readwrite("name", &PaddleTensor::name)
       .def_readwrite("shape", &PaddleTensor::shape)
       .def_readwrite("data", &PaddleTensor::data)
-- 
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