add CSharp Native Interface in C++

.gitignore

@@ -335,3 +335,8 @@ ASALocalRun/
 /tensorflowlib/linux/native/libtensorflow.so
 /src/TensorFlowNET.Core/tensorflow.dll
 /docs/build
+src/TensorFlowNET.Native/libtensorflow.dll
+src/TensorFlowNET.Native/bazel-*
+/src/TensorFlowNET.Native/libtensorflow.lib
+src/TensorFlowNET.Native/c_api.h
+/.vscode

src/TensorFlowNET.Native/BUILD

@@ -0,0 +1,19 @@
+# Description:
+# CSharp Native Interface library intended for implementing the
+# TensorFlow .NET Standard API using the TensorFlow C library.
+
+licenses(["notice"])  # Apache 2.0
+
+cc_import(
+  name = "libtensorflow",
+  hdrs = ["c_api.h"],
+  interface_library = "libtensorflow.lib",
+  shared_library = "libtensorflow.dll",
+)
+
+cc_binary(
+    name = "csni",
+    srcs = ["csni.cc"],
+    deps = [":libtensorflow"],
+    linkstatic = 0
+)

src/TensorFlowNET.Native/csni.cc

@@ -0,0 +1,21 @@
+#include <windows.h>
+#include <iostream>
+#include "c_api.h"
+typedef char* (__stdcall *TFFunc)();
+
+int main() {
+  HINSTANCE hinstLib = LoadLibrary(TEXT("libtensorflow.dll"));
+  if (!hinstLib) {
+    std::cout << "could not load the dynamic library" << std::endl;
+    return EXIT_FAILURE;
+  }
+
+  TFFunc version = (TFFunc) GetProcAddress(hinstLib, "TF_Version");
+  if (!version) {
+    std::cout << "could not locate the function" << std::endl;
+    return EXIT_FAILURE;
+  }
+  
+  printf("Hello from TensorFlow C library version %s", version());
+  return 0;
+}

src/tensorflow/README.md

@@ -0,0 +1,12 @@
+### How to compile CSharp Native Interface
+
+
+git clone https://github.com/tensorflow/tensorflow
+
+`cd tensorflow/tensorflow`
+
+copy `csharp` folder to `tensorflow`, the csharp folder should be in the same parent directory with other language binding.
+
+`cd csharp`
+
+`bazel build //tensorflow/csharp:csni`

src/tensorflow/csharp/BUILD

@@ -0,0 +1,23 @@
+# Description:
+# CSharp Native Interface library intended for implementing the
+# TensorFlow .NET Standard API using the TensorFlow C library.
+package(
+    default_visibility = ["//visibility:private"],
+)
+
+licenses(["notice"])  # Apache 2.0
+
+load(
+    "//tensorflow:tensorflow.bzl",
+    "tf_cc_binary"
+)
+
+
+
+tf_cc_binary(
+    name = "csni",
+    srcs = ["csni.cc"],
+    deps = [
+      "//tensorflow/c:c_api",
+      "//tensorflow/csharp/eager:cswrap_tfe_lib"],
+)

src/tensorflow/csharp/csni.cc

@@ -0,0 +1,7 @@
+#include <iostream>
+#include "tensorflow/c/c_api.h"
+
+int main() {
+  printf("Hello from TensorFlow C library version %s", TF_Version());
+  return 0;
+}

src/tensorflow/csharp/eager/BUILD

@@ -0,0 +1,19 @@
+load("//tensorflow:tensorflow.bzl", "tf_cc_binary")
+
+cc_library(
+    name = "cswrap_tfe_lib",
+    srcs = [
+        "cswrap_tfe_src.cc",
+    ],
+    hdrs = [
+        "cswrap_tfe.h",
+    ],
+    visibility = [
+        "//learning/deepmind/courier:__subpackages__",
+        "//tensorflow:internal",
+    ],
+    deps = [
+        "//tensorflow/c:c_api",
+
+    ],
+)

src/tensorflow/csharp/eager/cswrap_tfe.h

@@ -0,0 +1,4 @@
+// Record the gradient for a given op.
+extern void TFE_Py_RecordGradient(const char* op_name, void* inputs,
+                                void* attrs, void* results,
+                                const char* name);

src/tensorflow/csharp/eager/cswrap_tfe_src.cc

@@ -0,0 +1,23 @@
+#include <cstring>
+#include <thread>
+
+#include "tensorflow/core/lib/core/errors.h"
+#include "cswrap_tfe.h"
+
+#include "tensorflow/c/c_api.h"
+#include "tensorflow/c/c_api_internal.h"
+
+#include "tensorflow/core/platform/protobuf.h"
+#include "tensorflow/core/platform/types.h"
+
+
+namespace {
+
+void RecordGradient(const char* op_name, void* inputs,
+                                void* attrs, void* results,
+                                const char* name) {
+  // std::vector<tensorflow::int64> input_ids = MakeTensorIDList(inputs);
+  
+}
+
+}