onnx、openvino和mnn推理速度对比

小灰灰 2023-01-08 12:29 832阅读 0赞

onnx、openvino和mnn都可以作为cpu推理的框架，推理速度这里进行对比一下

模型使用的[python版openvino使用][python_openvino]这篇 文章onnx文件

注意：这里使用的mnn和onnx文件均未量化等操作，是直接转换而来的，都是直接进行读取的

对比代码如下：

from openvino.inference_engine import IECore
    import onnxruntime
    import MNN
    import numpy as np
    import cv2
    import time
    
    model="ctdet_coco_dlav0_512.onnx"
    mnnmodel="ctdet_coco_dlav0_512.mnn"
    
    #openvino
    ie = IECore()
    net = ie.read_network(model=model)
    input_blob = next(iter(net.input_info))
    out_blob = next(iter(net.outputs))
    net.batch_size=1#batchsize
    n, c, h, w = net.input_info[input_blob].input_data.shape
    print(n, c, h, w)
    images = np.ndarray(shape=(n, c, h, w))
    for i in range(n):
            image = cv2.imread("123.jpg")
            if image.shape[:-1] != (h, w):
                image = cv2.resize(image, (w, h))
            image = image.transpose((2, 0, 1))
            images[i] = image
    images=images.astype(np.float32)
    exec_net = ie.load_network(network=net, device_name="CPU")
    
    #onnxruntime
    session = onnxruntime.InferenceSession(model)
    inputs = {session.get_inputs()[0].name: images.astype(np.float32)}
    
    #mnn
    interpreter = MNN.Interpreter(mnnmodel)
    mnn_session = interpreter.createSession()
    input_tensor = interpreter.getSessionInput(mnn_session)
    tmp_input = MNN.Tensor((1, 3, 512, 512),\
    MNN.Halide_Type_Float, images[0], MNN.Tensor_DimensionType_Tensorflow)  
    input_tensor.copyFrom(tmp_input)
    
    #onnxruntime infer
    start=time.time()
    out=session.run(None, inputs)
    print('onnxruntime infer total time is %.4f s'%(time.time()-start))
    #openvino infer
    start=time.time()
    res = exec_net.infer(inputs={input_blob: images})
    #print(res)
    print('openvino infer total time is %.4f s'%(time.time()-start))
    #mnn infer
    start=time.time()
    interpreter.runSession(mnn_session)
    print('mnn infer total time is %.4f s'%(time.time()-start))

运行结果：

![20210120110234308.png][]

结论：可以看到openvino确实优化速度很多，提升大于30%，mnn速度提升不明显

[python_openvino]: https://blog.csdn.net/zhou_438/article/details/112846704
[20210120110234308.png]: /images/20221119/4890b2ee4607467eb19fa33612aa82ed.png