[CANN]: Update the doc of CANN EP

docs/execution-providers/community-maintained/CANN-ExecutionProvider.md

@@ -32,10 +32,9 @@ Please reference table below for official CANN packages dependencies for the ONN
 
 |ONNX Runtime|CANN|
 |---|---|
-|v1.12.1|6.0.0|
-|v1.13.1|6.0.0|
-|v1.14.0|6.0.0|
-|v1.15.0|6.0.0|
+|v1.18.0|8.0.0|
+|v1.19.0|8.0.0|
+|v1.20.0|8.0.0|
 
 ## Build
 
@@ -201,26 +200,149 @@ session = ort.InferenceSession(model_path, sess_options=options, providers=provi
 ```
 
 ### C/C++
-
-```c
-const static OrtApi *g_ort = OrtGetApiBase()->GetApi(ORT_API_VERSION);
-
-OrtSessionOptions *session_options;
-g_ort->CreateSessionOptions(&session_options);
-
-OrtCANNProviderOptions *cann_options = nullptr;
-g_ort->CreateCANNProviderOptions(&cann_options);
-
-std::vector<const char *> keys{"device_id", "npu_mem_limit", "arena_extend_strategy", "enable_cann_graph"};
-std::vector<const char *> values{"0", "2147483648", "kSameAsRequested", "1"};
-
-g_ort->UpdateCANNProviderOptions(cann_options, keys.data(), values.data(), keys.size());
-
-g_ort->SessionOptionsAppendExecutionProvider_CANN(session_options, cann_options);
-
-// Finally, don't forget to release the provider options and session options
-g_ort->ReleaseCANNProviderOptions(cann_options);
-g_ort->ReleaseSessionOptions(session_options);
+Note: This sample shows model inference using [resnet50_Opset16.onnx](https://github.com/onnx/models/tree/main/Computer_Vision/resnet50_Opset16_timm) as an example. 
+      You need to modify the model_path, and the input_prepare() and output_postprocess() functions according to your needs.
+
+
+```c++
+#include <iostream>
+#include <vector>
+
+#include "onnxruntime_cxx_api.h"
+
+// path of model, Change to user's own model path
+const char* model_path = "/home/dou/models/onnx/resnet50_Opset16.onnx";
+
+/**
+ * @brief Input data preparation provided by user.
+ *
+ * @param num_input_nodes The number of model input nodes.
+ * @return  A collection of input data.
+ */
+std::vector<std::vector<float>> input_prepare(size_t num_input_nodes) {
+  std::vector<std::vector<float>> input_datas;
+  input_datas.reserve(num_input_nodes);
+
+  constexpr size_t input_data_size = 3 * 224 * 224;
+  std::vector<float> input_data(input_data_size);
+  // initialize input data with values in [0.0, 1.0]
+  for (unsigned int i = 0; i < input_data_size; i++)
+    input_data[i] = (float)i / (input_data_size + 1);
+  input_datas.push_back(input_data);
+
+  return input_datas;
+}
+
+/**
+ * @brief Model output data processing logic(For User updates).
+ *
+ * @param output_tensors The results of the model output.
+ */
+void output_postprocess(std::vector<Ort::Value>& output_tensors) {
+  auto floatarr = output_tensors.front().GetTensorMutableData<float>();
+
+  for (int i = 0; i < 5; i++) {
+    std::cout << "Score for class [" << i << "] =  " << floatarr[i] << '\n';
+  }
+
+  std::cout << "Done!" << std::endl;
+}
+
+/**
+ * @brief The main functions for model inference.
+ *
+ *  The complete model inference process, which generally does not need to be
+ * changed here
+ */
+void inference() {
+  const auto& api = Ort::GetApi();
+
+  // Enable cann graph in cann provider option.
+  OrtCANNProviderOptions* cann_options = nullptr;
+  api.CreateCANNProviderOptions(&cann_options);
+
+  // Configurations of EP
+  std::vector<const char*> keys{
+      "device_id",
+      "npu_mem_limit",
+      "arena_extend_strategy",
+      "enable_cann_graph"};
+  std::vector<const char*> values{"0", "4294967296", "kNextPowerOfTwo", "1"};
+  api.UpdateCANNProviderOptions(
+      cann_options, keys.data(), values.data(), keys.size());
+
+  // Convert to general session options
+  Ort::SessionOptions session_options;
+  api.SessionOptionsAppendExecutionProvider_CANN(
+      static_cast<OrtSessionOptions*>(session_options), cann_options);
+
+  Ort::Session session(Ort::Env(), model_path, session_options);
+
+  Ort::AllocatorWithDefaultOptions allocator;
+
+  // Input Process
+  const size_t num_input_nodes = session.GetInputCount();
+  std::vector<const char*> input_node_names;
+  std::vector<Ort::AllocatedStringPtr> input_names_ptr;
+  input_node_names.reserve(num_input_nodes);
+  input_names_ptr.reserve(num_input_nodes);
+  std::vector<std::vector<int64_t>> input_node_shapes;
+  std::cout << num_input_nodes << std::endl;
+  for (size_t i = 0; i < num_input_nodes; i++) {
+    auto input_name = session.GetInputNameAllocated(i, allocator);
+    input_node_names.push_back(input_name.get());
+    input_names_ptr.push_back(std::move(input_name));
+    auto type_info = session.GetInputTypeInfo(i);
+    auto tensor_info = type_info.GetTensorTypeAndShapeInfo();
+    input_node_shapes.push_back(tensor_info.GetShape());
+  }
+
+  // Output Process
+  const size_t num_output_nodes = session.GetOutputCount();
+  std::vector<const char*> output_node_names;
+  std::vector<Ort::AllocatedStringPtr> output_names_ptr;
+  output_names_ptr.reserve(num_input_nodes);
+  output_node_names.reserve(num_output_nodes);
+  for (size_t i = 0; i < num_output_nodes; i++) {
+    auto output_name = session.GetOutputNameAllocated(i, allocator);
+    output_node_names.push_back(output_name.get());
+    output_names_ptr.push_back(std::move(output_name));
+  }
+
+  //  User need to generate input date according to real situation.
+  std::vector<std::vector<float>> input_datas = input_prepare(num_input_nodes);
+
+  auto memory_info = Ort::MemoryInfo::CreateCpu(
+      OrtAllocatorType::OrtArenaAllocator, OrtMemTypeDefault);
+
+  std::vector<Ort::Value> input_tensors;
+  input_tensors.reserve(num_input_nodes);
+  for (size_t i = 0; i < input_node_shapes.size(); i++) {
+    auto input_tensor = Ort::Value::CreateTensor<float>(
+        memory_info,
+        input_datas[i].data(),
+        input_datas[i].size(),
+        input_node_shapes[i].data(),
+        input_node_shapes[i].size());
+    input_tensors.push_back(std::move(input_tensor));
+  }
+
+  auto output_tensors = session.Run(
+      Ort::RunOptions{nullptr},
+      input_node_names.data(),
+      input_tensors.data(),
+      num_input_nodes,
+      output_node_names.data(),
+      output_node_names.size());
+
+  // Processing of out_tensor
+  output_postprocess(output_tensors);
+}
+
+int main(int argc, char* argv[]) {
+  inference();
+  return 0;
+}
 ```
 
 ## Supported ops