Pytorch实现RNN预测模型并使用C++相应的ONNX模型推理

wydxry2023-09-18 23:25

Pytorch实现RNN模型

代码

python 复制代码 
import torch
import torch.nn as nn

class RNN(nn.Module):
    def __init__(self, seq_len, input_size, hidden_size, output_size, num_layers, device):
        super(RNN, self).__init__()
        self._seq_len = seq_len
        self._input_size = input_size
        self._output_size = output_size
        self._hidden_size = hidden_size
        self._device = device
        self._num_layers = num_layers

        self.rnn = nn.RNN(
            input_size=input_size,
            hidden_size=self._hidden_size,
            num_layers=self._num_layers,
            batch_first=True
        )

        self.fc = nn.Linear(self._seq_len * self._hidden_size, self._output_size)

    def forward(self, x, hidden_prev):
        out, hidden_prev = self.rnn(x, hidden_prev)
        out = out.contiguous().view(out.shape[0], -1)
        out = self.fc(out)
        return out, hidden_prev

seq_len = 10
batch_size = 20
input_size = 10
output_size = 10
hidden_size = 32
num_layers = 2
model = RNN(seq_len, input_size, hidden_size, output_size, num_layers, "cpu")
hidden_prev = torch.zeros(num_layers, batch_size, hidden_size).to("cpu")
model.eval() 

input_names = ["input", "hidden_prev_in"]
output_names  = ["output", "hidden_prev_out"]

x = torch.randn((batch_size, seq_len, input_size))
y, hidden_prev = model(x, hidden_prev)
print(x.shape)
print(hidden_prev.shape)
print(y.shape)
print(hidden_prev.shape)

torch.onnx.export(model, (x, hidden_prev), 'RNN.onnx', verbose=True, input_names=input_names, output_names=output_names,
  dynamic_axes={'input':[0], 'hidden_prev_in':[1], 'output':[0], 'hidden_prev_out':[1]} )

import onnx
model = onnx.load("RNN.onnx")
print("load model done.")
onnx.checker.check_model(model)
print(onnx.helper.printable_graph(model.graph))
print("check model done.")

运行结果

Shell 复制代码 
torch.Size([20, 10, 10])
torch.Size([2, 20, 32])
torch.Size([20, 10])
torch.Size([2, 20, 32])
/home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/onnx/utils.py:2041: UserWarning: No names were found for specified dynamic axes of provided input.Automatically generated names will be applied to each dynamic axes of input input
  "No names were found for specified dynamic axes of provided input."
/home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/onnx/utils.py:2041: UserWarning: No names were found for specified dynamic axes of provided input.Automatically generated names will be applied to each dynamic axes of input hidden_prev
  "No names were found for specified dynamic axes of provided input."
/home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/onnx/utils.py:2041: UserWarning: No names were found for specified dynamic axes of provided input.Automatically generated names will be applied to each dynamic axes of input output
  "No names were found for specified dynamic axes of provided input."
/home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/onnx/symbolic_opset9.py:4322: UserWarning: Exporting a model to ONNX with a batch_size other than 1, with a variable length with RNN_TANH can cause an error when running the ONNX model with a different batch size. Make sure to save the model with a batch size of 1, or define the initial states (h0/c0) as inputs of the model. 
  + "or define the initial states (h0/c0) as inputs of the model. "
/home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/onnx/_internal/jit_utils.py:258: UserWarning: The shape inference of prim::Constant type is missing, so it may result in wrong shape inference for the exported graph. Please consider adding it in symbolic function. (Triggered internally at ../torch/csrc/jit/passes/onnx/shape_type_inference.cpp:1884.)
  _C._jit_pass_onnx_node_shape_type_inference(node, params_dict, opset_version)
/home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/onnx/utils.py:688: UserWarning: The shape inference of prim::Constant type is missing, so it may result in wrong shape inference for the exported graph. Please consider adding it in symbolic function. (Triggered internally at ../torch/csrc/jit/passes/onnx/shape_type_inference.cpp:1884.)
  graph, params_dict, GLOBALS.export_onnx_opset_version
/home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/onnx/utils.py:1179: UserWarning: The shape inference of prim::Constant type is missing, so it may result in wrong shape inference for the exported graph. Please consider adding it in symbolic function. (Triggered internally at ../torch/csrc/jit/passes/onnx/shape_type_inference.cpp:1884.)
  graph, params_dict, GLOBALS.export_onnx_opset_version
Exported graph: graph(%input : Float(*, 10, 10, strides=[100, 10, 1], requires_grad=0, device=cpu),
      %hidden_prev.1 : Float(2, *, 32, strides=[640, 32, 1], requires_grad=1, device=cpu),
      %fc.weight : Float(10, 320, strides=[320, 1], requires_grad=1, device=cpu),
      %fc.bias : Float(10, strides=[1], requires_grad=1, device=cpu),
      %onnx::RNN_58 : Float(1, 32, 10, strides=[320, 10, 1], requires_grad=0, device=cpu),
      %onnx::RNN_59 : Float(1, 32, 32, strides=[1024, 32, 1], requires_grad=0, device=cpu),
      %onnx::RNN_60 : Float(1, 64, strides=[64, 1], requires_grad=0, device=cpu),
      %onnx::RNN_62 : Float(1, 32, 32, strides=[1024, 32, 1], requires_grad=0, device=cpu),
      %onnx::RNN_63 : Float(1, 32, 32, strides=[1024, 32, 1], requires_grad=0, device=cpu),
      %onnx::RNN_64 : Float(1, 64, strides=[64, 1], requires_grad=0, device=cpu)):
  %/rnn/Transpose_output_0 : Float(10, *, 10, device=cpu) = onnx::Transpose[perm=[1, 0, 2], onnx_name="/rnn/Transpose"](%input), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %onnx::RNN_13 : Tensor? = prim::Constant(), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Constant_output_0 : Long(1, strides=[1], device=cpu) = onnx::Constant[value={0}, onnx_name="/rnn/Constant"](), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Constant_1_output_0 : Long(1, strides=[1], device=cpu) = onnx::Constant[value={0}, onnx_name="/rnn/Constant_1"](), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Constant_2_output_0 : Long(1, strides=[1], device=cpu) = onnx::Constant[value={1}, onnx_name="/rnn/Constant_2"](), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Slice_output_0 : Float(1, *, 32, device=cpu) = onnx::Slice[onnx_name="/rnn/Slice"](%hidden_prev.1, %/rnn/Constant_1_output_0, %/rnn/Constant_2_output_0, %/rnn/Constant_output_0), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/RNN_output_0 : Float(10, 1, *, 32, device=cpu), %/rnn/RNN_output_1 : Float(1, *, 32, device=cpu) = onnx::RNN[activations=["Tanh"], hidden_size=32, onnx_name="/rnn/RNN"](%/rnn/Transpose_output_0, %onnx::RNN_58, %onnx::RNN_59, %onnx::RNN_60, %onnx::RNN_13, %/rnn/Slice_output_0), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Constant_3_output_0 : Long(1, strides=[1], device=cpu) = onnx::Constant[value={1}, onnx_name="/rnn/Constant_3"](), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Squeeze_output_0 : Float(10, *, 32, device=cpu) = onnx::Squeeze[onnx_name="/rnn/Squeeze"](%/rnn/RNN_output_0, %/rnn/Constant_3_output_0), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Constant_4_output_0 : Long(1, strides=[1], device=cpu) = onnx::Constant[value={0}, onnx_name="/rnn/Constant_4"](), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Constant_5_output_0 : Long(1, strides=[1], device=cpu) = onnx::Constant[value={1}, onnx_name="/rnn/Constant_5"](), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Constant_6_output_0 : Long(1, strides=[1], device=cpu) = onnx::Constant[value={2}, onnx_name="/rnn/Constant_6"](), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Slice_1_output_0 : Float(1, *, 32, device=cpu) = onnx::Slice[onnx_name="/rnn/Slice_1"](%hidden_prev.1, %/rnn/Constant_5_output_0, %/rnn/Constant_6_output_0, %/rnn/Constant_4_output_0), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/RNN_1_output_0 : Float(10, 1, *, 32, device=cpu), %/rnn/RNN_1_output_1 : Float(1, *, 32, device=cpu) = onnx::RNN[activations=["Tanh"], hidden_size=32, onnx_name="/rnn/RNN_1"](%/rnn/Squeeze_output_0, %onnx::RNN_62, %onnx::RNN_63, %onnx::RNN_64, %onnx::RNN_13, %/rnn/Slice_1_output_0), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Constant_7_output_0 : Long(1, strides=[1], device=cpu) = onnx::Constant[value={1}, onnx_name="/rnn/Constant_7"](), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Squeeze_1_output_0 : Float(10, *, 32, device=cpu) = onnx::Squeeze[onnx_name="/rnn/Squeeze_1"](%/rnn/RNN_1_output_0, %/rnn/Constant_7_output_0), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/rnn/Transpose_1_output_0 : Float(*, 10, 32, strides=[320, 32, 1], requires_grad=1, device=cpu) = onnx::Transpose[perm=[1, 0, 2], onnx_name="/rnn/Transpose_1"](%/rnn/Squeeze_1_output_0), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %hidden_prev : Float(2, *, 32, strides=[640, 32, 1], requires_grad=1, device=cpu) = onnx::Concat[axis=0, onnx_name="/rnn/Concat"](%/rnn/RNN_output_1, %/rnn/RNN_1_output_1), scope: __main__.RNN::/torch.nn.modules.rnn.RNN::rnn # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/rnn.py:478:0
  %/Shape_output_0 : Long(3, strides=[1], device=cpu) = onnx::Shape[onnx_name="/Shape"](%/rnn/Transpose_1_output_0), scope: __main__.RNN:: # /zengli/20230320/ao/test/test_onnx_rnn.py:25:0
  %/Constant_output_0 : Long(device=cpu) = onnx::Constant[value={0}, onnx_name="/Constant"](), scope: __main__.RNN:: # /zengli/20230320/ao/test/test_onnx_rnn.py:25:0
  %/Gather_output_0 : Long(device=cpu) = onnx::Gather[axis=0, onnx_name="/Gather"](%/Shape_output_0, %/Constant_output_0), scope: __main__.RNN:: # /zengli/20230320/ao/test/test_onnx_rnn.py:25:0
  %onnx::Unsqueeze_50 : Long(1, strides=[1], device=cpu) = onnx::Constant[value={0}]()
  %/Unsqueeze_output_0 : Long(1, strides=[1], device=cpu) = onnx::Unsqueeze[onnx_name="/Unsqueeze"](%/Gather_output_0, %onnx::Unsqueeze_50), scope: __main__.RNN::
  %/Constant_1_output_0 : Long(1, strides=[1], requires_grad=0, device=cpu) = onnx::Constant[value={-1}, onnx_name="/Constant_1"](), scope: __main__.RNN::
  %/Concat_output_0 : Long(2, strides=[1], device=cpu) = onnx::Concat[axis=0, onnx_name="/Concat"](%/Unsqueeze_output_0, %/Constant_1_output_0), scope: __main__.RNN:: # /zengli/20230320/ao/test/test_onnx_rnn.py:25:0
  %/Reshape_output_0 : Float(*, *, strides=[320, 1], requires_grad=1, device=cpu) = onnx::Reshape[allowzero=0, onnx_name="/Reshape"](%/rnn/Transpose_1_output_0, %/Concat_output_0), scope: __main__.RNN:: # /zengli/20230320/ao/test/test_onnx_rnn.py:25:0
  %output : Float(*, 10, strides=[10, 1], requires_grad=1, device=cpu) = onnx::Gemm[alpha=1., beta=1., transB=1, onnx_name="/fc/Gemm"](%/Reshape_output_0, %fc.weight, %fc.bias), scope: __main__.RNN::/torch.nn.modules.linear.Linear::fc # /home/ubuntu/anaconda3/envs/py37/lib/python3.7/site-packages/torch/nn/modules/linear.py:114:0
  return (%output, %hidden_prev)

load model done.
graph torch_jit (
  %input[FLOAT, input_dynamic_axes_1x10x10]
  %hidden_prev.1[FLOAT, 2xhidden_prev.1_dim_1x32]
) initializers (
  %fc.weight[FLOAT, 10x320]
  %fc.bias[FLOAT, 10]
  %onnx::RNN_58[FLOAT, 1x32x10]
  %onnx::RNN_59[FLOAT, 1x32x32]
  %onnx::RNN_60[FLOAT, 1x64]
  %onnx::RNN_62[FLOAT, 1x32x32]
  %onnx::RNN_63[FLOAT, 1x32x32]
  %onnx::RNN_64[FLOAT, 1x64]
) {
  %/rnn/Transpose_output_0 = Transpose[perm = [1, 0, 2]](%input)
  %/rnn/Constant_output_0 = Constant[value = <Tensor>]()
  %/rnn/Constant_1_output_0 = Constant[value = <Tensor>]()
  %/rnn/Constant_2_output_0 = Constant[value = <Tensor>]()
  %/rnn/Slice_output_0 = Slice(%hidden_prev.1, %/rnn/Constant_1_output_0, %/rnn/Constant_2_output_0, %/rnn/Constant_output_0)
  %/rnn/RNN_output_0, %/rnn/RNN_output_1 = RNN[activations = ['Tanh'], hidden_size = 32](%/rnn/Transpose_output_0, %onnx::RNN_58, %onnx::RNN_59, %onnx::RNN_60, %, %/rnn/Slice_output_0)
  %/rnn/Constant_3_output_0 = Constant[value = <Tensor>]()
  %/rnn/Squeeze_output_0 = Squeeze(%/rnn/RNN_output_0, %/rnn/Constant_3_output_0)
  %/rnn/Constant_4_output_0 = Constant[value = <Tensor>]()
  %/rnn/Constant_5_output_0 = Constant[value = <Tensor>]()
  %/rnn/Constant_6_output_0 = Constant[value = <Tensor>]()
  %/rnn/Slice_1_output_0 = Slice(%hidden_prev.1, %/rnn/Constant_5_output_0, %/rnn/Constant_6_output_0, %/rnn/Constant_4_output_0)
  %/rnn/RNN_1_output_0, %/rnn/RNN_1_output_1 = RNN[activations = ['Tanh'], hidden_size = 32](%/rnn/Squeeze_output_0, %onnx::RNN_62, %onnx::RNN_63, %onnx::RNN_64, %, %/rnn/Slice_1_output_0)
  %/rnn/Constant_7_output_0 = Constant[value = <Tensor>]()
  %/rnn/Squeeze_1_output_0 = Squeeze(%/rnn/RNN_1_output_0, %/rnn/Constant_7_output_0)
  %/rnn/Transpose_1_output_0 = Transpose[perm = [1, 0, 2]](%/rnn/Squeeze_1_output_0)
  %hidden_prev = Concat[axis = 0](%/rnn/RNN_output_1, %/rnn/RNN_1_output_1)
  %/Shape_output_0 = Shape(%/rnn/Transpose_1_output_0)
  %/Constant_output_0 = Constant[value = <Scalar Tensor []>]()
  %/Gather_output_0 = Gather[axis = 0](%/Shape_output_0, %/Constant_output_0)
  %onnx::Unsqueeze_50 = Constant[value = <Tensor>]()
  %/Unsqueeze_output_0 = Unsqueeze(%/Gather_output_0, %onnx::Unsqueeze_50)
  %/Constant_1_output_0 = Constant[value = <Tensor>]()
  %/Concat_output_0 = Concat[axis = 0](%/Unsqueeze_output_0, %/Constant_1_output_0)
  %/Reshape_output_0 = Reshape[allowzero = 0](%/rnn/Transpose_1_output_0, %/Concat_output_0)
  %output = Gemm[alpha = 1, beta = 1, transB = 1](%/Reshape_output_0, %fc.weight, %fc.bias)
  return %output, %hidden_prev
}
check model done.

C++调用ONNX

代码

cpp 复制代码 
vector<float> testOnnxRNN() {
    //设置为VERBOSE，方便控制台输出时看到是使用了cpu还是gpu执行
    //Ort::Env env(ORT_LOGGING_LEVEL_VERBOSE, "test");
    Ort::Env env(ORT_LOGGING_LEVEL_WARNING, "Default");
    Ort::SessionOptions session_options;

    session_options.SetIntraOpNumThreads(5); // 使用五个线程执行op,提升速度
    // 第二个参数代表GPU device_id = 0，注释这行就是cpu执行
    //OrtSessionOptionsAppendExecutionProvider_CUDA(session_options, 0);
    session_options.SetGraphOptimizationLevel(GraphOptimizationLevel::ORT_ENABLE_ALL);

    #ifdef _WIN32
        const wchar_t* model_path = L"C:\\Users\\xxx\\Desktop\\RNN.onnx";
    #else
        const char* model_path = "C:\\Users\\xxx\\Desktop\\RNN.onnx";
    #endif

    wprintf(L"%s\n", model_path);

    Ort::Session session(env, model_path, session_options);
    Ort::AllocatorWithDefaultOptions allocator;

    size_t num_input_nodes = session.GetInputCount();
    size_t num_output_nodes = session.GetOutputCount();

    std::vector<const char*> input_node_names = { "input" , "hidden_prev_in" }; 
    std::vector<const char*> output_node_names = { "output" , "hidden_prev_out" };

    const int input_size = 10;
    const int output_size = 10;
    const int batch_size = 1;
    const int seq_len = 10;
    const int num_layers = 2;
    const int hidden_size = 32;

    std::vector<int64_t> input_node_dims = { batch_size, seq_len, input_size };
    size_t input_tensor_size = batch_size * seq_len * input_size;
    std::vector<float> input_tensor_values(input_tensor_size);
    for (unsigned int i = 0; i < input_tensor_size; i++) {
        input_tensor_values[i] = (float)i / (input_tensor_size + 1);
    }
    auto memory_info = Ort::MemoryInfo::CreateCpu(OrtArenaAllocator, OrtMemTypeDefault);
    Ort::Value input_tensor = Ort::Value::CreateTensor<float>(memory_info, input_tensor_values.data(), input_tensor_size, input_node_dims.data(), 3);
    assert(input_tensor.IsTensor());

    std::vector<int64_t> hidden_prev_in_node_dims = { num_layers, batch_size, hidden_size };
    size_t hidden_prev_in_tensor_size = num_layers * batch_size * hidden_size;
    std::vector<float> hidden_prev_in_tensor_values(hidden_prev_in_tensor_size);
    for (unsigned int i = 0; i < hidden_prev_in_tensor_size; i++) {
        hidden_prev_in_tensor_values[i] = (float)i / (hidden_prev_in_tensor_size + 1);
    }
    auto mask_memory_info = Ort::MemoryInfo::CreateCpu(OrtArenaAllocator, OrtMemTypeDefault);
    Ort::Value hidden_prev_in_tensor = Ort::Value::CreateTensor<float>(mask_memory_info, hidden_prev_in_tensor_values.data(), hidden_prev_in_tensor_size, hidden_prev_in_node_dims.data(), 3);
    assert(hidden_prev_in_tensor.IsTensor());

    std::vector<Ort::Value> ort_inputs;
    ort_inputs.push_back(std::move(input_tensor));
    ort_inputs.push_back(std::move(hidden_prev_in_tensor));

    vector<float> ret;
    try
    {
        auto output_tensors = session.Run(Ort::RunOptions{ nullptr }, input_node_names.data(), ort_inputs.data(), ort_inputs.size(), output_node_names.data(), 2);
        float* output = output_tensors[0].GetTensorMutableData<float>();
        float* hidden_prev_out = output_tensors[1].GetTensorMutableData<float>();
           
        // output
        for (int i = 0; i < output_size; i++) {
            ret.emplace_back(output[i]);
            std::cout << output[i] << " ";
        }
        std::cout << "\n";

        // hidden_prev_out
        //for (int i = 0; i < num_layers * batch_size * hidden_size; i++) {
        //    std::cout << hidden_prev_out[i] << "\t";
        //}
        //std::cout << "\n";
    }
    catch (const std::exception& e)
    {
        std::cout << e.what() << std::endl;
    }
    return ret;
}

运行结果

bash 复制代码 
C:\Users\xxx\Desktop\RNN.onnx
0.00296116 0.104443 -0.104239 0.249864 -0.155839 0.019295 0.0458037 -0.0596341 -0.129019 -0.014682
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