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模型部署模型推理
我们会将PyTorch训练好的模型转换为ONNX 格式#xff0c;然后使用ONNX Runtime运行它进行推理
1、ONNX
ONNX( Open Neural Network Exchange) 是 Facebook (现Meta) 和微软在2017年共同发布的#xff0c;用于标准描述计算图的一种格式…模型部署推理
模型部署模型推理
我们会将PyTorch训练好的模型转换为ONNX 格式然后使用ONNX Runtime运行它进行推理
1、ONNX
ONNX( Open Neural Network Exchange) 是 Facebook (现Meta) 和微软在2017年共同发布的用于标准描述计算图的一种格式。ONNX通过定义一组与环境和平台无关的标准格式使AI模型可以在不同框架和环境下交互使用ONNX可以看作深度学习框架和部署端的桥梁就像编译器的中间语言一样
由于各框架兼容性不一我们通常只用 ONNX 表示更容易部署的静态图。硬件和软件厂商只需要基于ONNX标准优化模型性能让所有兼容ONNX标准的框架受益
ONNX主要关注在模型预测方面使用不同框架训练的模型转化为ONNX格式后可以很容易的部署在兼容ONNX的运行环境中
ONNX官网https://onnx.ai/ONNX GitHubhttps://github.com/onnx/onnx
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2、ONNX Runtime
ONNX Runtime官网https://www.onnxruntime.ai/ONNX Runtime GitHubhttps://github.com/microsoft/onnxruntime
ONNX Runtime 是由微软维护的一个跨平台机器学习推理加速器它直接对接ONNX可以直接读取.onnx文件并实现推理不需要再把 .onnx 格式的文件转换成其他格式的文件
PyTorch借助ONNX Runtime也完成了部署的最后一公里构建了 PyTorch -- ONNX -- ONNX Runtime 部署流水线
安装onnx
pip install onnx
安装onnx runtime
pip install onnxruntime # 使用CPU进行推理
pip install onnxruntime-gpu # 使用GPU进行推理
注意ONNX和ONNX Runtime之间的适配关系。我们可以访问ONNX Runtime的Github进行查看
网址https://github.com/microsoft/onnxruntime/blob/master/docs/Versioning.md
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ONNX Runtime和CUDA之间的适配关系
网址https://onnxruntime.ai/docs/execution-providers/CUDA-ExecutionProvider.html
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ONNX Runtime、TensorRT和CUDA的匹配关系
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3、模型转换为ONNX格式
用torch.onnx.export()把模型转换成 ONNX 格式的函数模型导成onnx格式前我们必须调用model.eval()或者model.train(False)以确保我们的模型处在推理模式下
import torch.onnx
# 转换的onnx格式的名称文件后缀需为.onnx
onnx_file_name resnet50.onnx
# 我们需要转换的模型将torch_model设置为自己的模型
model torchvision.models.resnet50(pretrainedTrue)
# 加载权重将model.pth转换为自己的模型权重
model model.load_state_dict(torch.load(resnet50.pt))
# 导出模型前必须调用model.eval()或者model.train(False)
model.eval()
# dummy_input就是一个输入的实例仅提供输入shape、type等信息
batch_size 1 # 随机的取值当设置dynamic_axes后影响不大
dummy_input torch.randn(batch_size, 3, 224, 224, requires_gradTrue)
# 这组输入对应的模型输出
output model(dummy_input)
# 导出模型
torch.onnx.export(model, # 模型的名称dummy_input, # 一组实例化输入onnx_file_name, # 文件保存路径/名称export_paramsTrue, # 如果指定为True或默认, 参数也会被导出. 如果你要导出一个没训练过的就设为 False.opset_version10, # ONNX 算子集的版本当前已更新到15do_constant_foldingTrue, # 是否执行常量折叠优化input_names [conv1], # 输入模型的张量的名称output_names [fc], # 输出模型的张量的名称# dynamic_axes将batch_size的维度指定为动态# 后续进行推理的数据可以与导出的dummy_input的batch_size不同dynamic_axes{conv1 : {0 : batch_size}, fc : {0 : batch_size}})注 算子版本对照文档https://github.com/onnx/onnx/blob/main/docs/Operators.md
ONNX模型的检验
我们需要检测下我们的模型文件是否可用我们将通过onnx.checker.check_model()进行检验
import onnx
# 我们可以使用异常处理的方法进行检验
try:# 当我们的模型不可用时将会报出异常onnx.checker.check_model(self.onnx_model)
except onnx.checker.ValidationError as e:print(The model is invalid: %s%e)
else:# 模型可用时将不会报出异常并会输出“The model is valid!”print(The model is valid!)ONNX模型可视化
使用netron做可视化。下载地址https://netron.app/
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模型的输入输出信息
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使用ONNX Runtime进行推理 import onnxruntime
# 需要进行推理的onnx模型文件名称
onnx_file_name xxxxxx.onnx# onnxruntime.InferenceSession用于获取一个 ONNX Runtime 推理器
ort_session onnxruntime.InferenceSession(onnx_file_name, providers[CPUExecutionProvider])
# session_fp32 onnxruntime.InferenceSession(resnet50.onnx, providers[CUDAExecutionProvider])
# session_fp32 onnxruntime.InferenceSession(resnet50.onnx, providers[OpenVINOExecutionProvider])# 构建字典的输入数据字典的key需要与我们构建onnx模型时的input_names相同
# 输入的input_img 也需要改变为ndarray格式
# ort_inputs {conv_1: input_img}
#建议使用下面这种方法,因为避免了手动输入key
ort_inputs {ort_session.get_inputs()[0].name:input_img}# run是进行模型的推理第一个参数为输出张量名的列表一般情况可以设置为None
# 第二个参数为构建的输入值的字典
# 由于返回的结果被列表嵌套因此我们需要进行[0]的索引
ort_output ort_session.run(None,ort_inputs)[0]
# output {ort_session.get_outputs()[0].name}
# ort_output ort_session.run([output], ort_inputs)[0]
注意
PyTorch模型的输入为tensor而ONNX的输入为array因此我们需要对张量进行变换或者直接将数据读取为array格式输入的array的shape应该和我们导出模型的dummy_input的shape相同如果图片大小不一样我们应该先进行resize操作run的结果是一个列表我们需要进行索引操作才能获得array格式的结果在构建输入的字典时我们需要注意字典的key应与导出ONNX格式设置的input_name相同
完整代码
1. 安装下载
#!pip install onnx -i https://pypi.tuna.tsinghua.edu.cn/simple
#!pip install onnxruntime -i https://pypi.tuna.tsinghua.edu.cn/simple
#!pip install torch -i https://pypi.tuna.tsinghua.edu.cn/simple
# Download ImageNet labels
#!wget https://raw.githubusercontent.com/pytorch/hub/master/imagenet_classes.txt2、定义模型
import torch
import io
import time
from PIL import Image
import torchvision.transforms as transforms
from torchvision import datasets
import onnx
import onnxruntime
import torchvision
import numpy as np
from torch import nn
import torch.nn.init as initonnx_file resnet50.onnx
save_dir ./resnet50.pt# 下载预训练模型
Resnet50 torchvision.models.resnet50(pretrainedTrue)# 保存 模型权重
torch.save(Resnet50.state_dict(), save_dir)print(Resnet50)D:\Users\xulele\Anaconda3\lib\site-packages\torchvision\models\_utils.py:208: UserWarning: The parameter pretrained is deprecated since 0.13 and may be removed in the future, please use weights instead.warnings.warn(
D:\Users\xulele\Anaconda3\lib\site-packages\torchvision\models\_utils.py:223: UserWarning: Arguments other than a weight enum or None for weights are deprecated since 0.13 and may be removed in the future. The current behavior is equivalent to passing weightsResNet50_Weights.IMAGENET1K_V1. You can also use weightsResNet50_Weights.DEFAULT to get the most up-to-date weights.warnings.warn(msg)ResNet((conv1): Conv2d(3, 64, kernel_size(7, 7), stride(2, 2), padding(3, 3), biasFalse)(bn1): BatchNorm2d(64, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue)(maxpool): MaxPool2d(kernel_size3, stride2, padding1, dilation1, ceil_modeFalse)(layer1): Sequential((0): Bottleneck((conv1): Conv2d(64, 64, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(64, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(64, 64, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(64, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(64, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue)(downsample): Sequential((0): Conv2d(64, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(1): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)))(1): Bottleneck((conv1): Conv2d(256, 64, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(64, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(64, 64, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(64, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(64, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue))(2): Bottleneck((conv1): Conv2d(256, 64, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(64, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(64, 64, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(64, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(64, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue)))(layer2): Sequential((0): Bottleneck((conv1): Conv2d(256, 128, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(128, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(128, 128, kernel_size(3, 3), stride(2, 2), padding(1, 1), biasFalse)(bn2): BatchNorm2d(128, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(128, 512, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue)(downsample): Sequential((0): Conv2d(256, 512, kernel_size(1, 1), stride(2, 2), biasFalse)(1): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)))(1): Bottleneck((conv1): Conv2d(512, 128, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(128, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(128, 128, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(128, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(128, 512, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue))(2): Bottleneck((conv1): Conv2d(512, 128, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(128, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(128, 128, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(128, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(128, 512, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue))(3): Bottleneck((conv1): Conv2d(512, 128, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(128, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(128, 128, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(128, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(128, 512, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue)))(layer3): Sequential((0): Bottleneck((conv1): Conv2d(512, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(256, 256, kernel_size(3, 3), stride(2, 2), padding(1, 1), biasFalse)(bn2): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(256, 1024, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(1024, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue)(downsample): Sequential((0): Conv2d(512, 1024, kernel_size(1, 1), stride(2, 2), biasFalse)(1): BatchNorm2d(1024, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)))(1): Bottleneck((conv1): Conv2d(1024, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(256, 256, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(256, 1024, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(1024, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue))(2): Bottleneck((conv1): Conv2d(1024, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(256, 256, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(256, 1024, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(1024, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue))(3): Bottleneck((conv1): Conv2d(1024, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(256, 256, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(256, 1024, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(1024, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue))(4): Bottleneck((conv1): Conv2d(1024, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(256, 256, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(256, 1024, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(1024, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue))(5): Bottleneck((conv1): Conv2d(1024, 256, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(256, 256, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(256, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(256, 1024, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(1024, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue)))(layer4): Sequential((0): Bottleneck((conv1): Conv2d(1024, 512, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(512, 512, kernel_size(3, 3), stride(2, 2), padding(1, 1), biasFalse)(bn2): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(512, 2048, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(2048, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue)(downsample): Sequential((0): Conv2d(1024, 2048, kernel_size(1, 1), stride(2, 2), biasFalse)(1): BatchNorm2d(2048, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)))(1): Bottleneck((conv1): Conv2d(2048, 512, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(512, 512, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(512, 2048, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(2048, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue))(2): Bottleneck((conv1): Conv2d(2048, 512, kernel_size(1, 1), stride(1, 1), biasFalse)(bn1): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv2): Conv2d(512, 512, kernel_size(3, 3), stride(1, 1), padding(1, 1), biasFalse)(bn2): BatchNorm2d(512, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(conv3): Conv2d(512, 2048, kernel_size(1, 1), stride(1, 1), biasFalse)(bn3): BatchNorm2d(2048, eps1e-05, momentum0.1, affineTrue, track_running_statsTrue)(relu): ReLU(inplaceTrue)))(avgpool): AdaptiveAvgPool2d(output_size(1, 1))(fc): Linear(in_features2048, out_features1000, biasTrue)
)3. 模型导出为ONNX格式 batch_size 1 # just a random number
# 先加载模型结构
loaded_model torchvision.models.resnet50()
# 在加载模型权重
loaded_model.load_state_dict(torch.load(save_dir))
#单卡GPU
# loaded_model.cuda()# 将模型设置为推理模式
loaded_model.eval()
# Input to the model
x torch.randn(batch_size, 3, 224, 224, requires_gradTrue)
torch_out loaded_model(x)
torch_outtensor([[-5.8050e-01, 7.5065e-02, 1.9404e-01, -9.1107e-01, 9.9716e-01,-1.2941e00, -1.3402e-01, -6.4496e-01, 6.0434e-01, -1.6355e00,-1.5187e-01, 1.0285e00, -9.0719e-02, -2.6877e-01, -1.2656e00,-7.9748e-01, -1.3802e00, -9.6179e-01, 5.3512e-01, 8.3388e-02,-6.2868e-01, 1.5385e-01, -2.5405e-01, 4.3549e-01, -3.2834e-02,-8.9873e-01, -1.7059e00, -8.5661e-01, -1.4386e00, -2.0589e00,-2.3464e00, -3.6227e-01, -3.5712e00, -1.6644e00, -3.0064e-01,-1.8671e00, 7.5745e-01, -2.3606e00, 1.2460e-01, 2.7504e-01,-2.1071e-01, -2.6051e00, 4.9932e-02, -3.0857e-01, -1.5757e-02,5.6365e-02, 1.0149e-01, -2.4776e00, 1.7863e00, -2.1650e00,1.8615e00, -2.8109e00, -2.0084e00, -5.4413e-01, 8.8444e-01,-8.8331e-01, 7.3980e-02, -2.0061e00, 5.5653e-01, 7.1335e-01,4.6456e-01, 1.0112e00, 4.2683e-01, -1.8685e-01, -1.1910e00,1.6901e-01, -7.3501e-01, -2.4989e-01, -2.7711e-01, 1.8286e00,-1.1317e00, 1.9985e00, 4.0941e-01, 2.7733e-01, -5.1216e-02,3.1703e-01, -2.1450e-01, 1.5035e00, 1.2469e00, 3.6729e00,-1.2205e00, 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torch.onnx.export(loaded_model, # model being runx, # model input (or a tuple for multiple inputs)onnx_file, # where to save the model (can be a file or file-like object)export_paramsTrue, # store the trained parameter weights inside the model fileopset_version10, # the ONNX version to export the model todo_constant_foldingTrue, # whether to execute constant folding for optimizationinput_names [conv1], # the models input namesoutput_names [fc], # the models output names# variable length axesdynamic_axes{conv1 : {0 : batch_size}, fc : {0 : batch_size}})Diagnostic Run torch.onnx.export version 2.0.0cu117
verbose: False, log level: Level.ERROR0 NONE 0 NOTE 0 WARNING 0 ERROR 4、检验ONNX模型
# 我们可以使用异常处理的方法进行检验
try:# 当我们的模型不可用时将会报出异常onnx.checker.check_model(onnx_file)
except onnx.checker.ValidationError as e:print(The model is invalid: %s%e)
else:# 模型可用时将不会报出异常并会输出“The model is valid!”print(The model is valid!)The model is valid!5. 使用ONNX Runtime进行推理
import onnxruntime
import numpy as nport_session onnxruntime.InferenceSession(onnx_file, providers[CPUExecutionProvider])# 将张量转化为ndarray格式
def to_numpy(tensor):return tensor.detach().cpu().numpy() if tensor.requires_grad else tensor.cpu().numpy()# 构建输入的字典和计算输出结果
ort_inputs {ort_session.get_inputs()[0].name: to_numpy(x)}
ort_outs ort_session.run(None, ort_inputs)# 比较使用PyTorch和ONNX Runtime得出的精度
np.testing.assert_allclose(to_numpy(torch_out), ort_outs[0], rtol1e-03, atol1e-05)print(Exported model has been tested with ONNXRuntime, and the result looks good!)Exported model has been tested with ONNXRuntime, and the result looks good!6. 进行实际预测并可视化
# 推理数据
from PIL import Image
from torchvision.transforms import transforms# 生成推理图片
image Image.open(./images/cat.jpg)# 将图像调整为指定大小
image image.resize((224, 224))# 将图像转换为 RGB 模式
image image.convert(RGB)image.save(./images/cat_224.jpg)
categories []
# Read the categories
with open(./imagenet/imagenet_classes.txt, r) as f:categories [s.strip() for s in f.readlines()]def get_class_name(probabilities):# Show top categories per imagetop5_prob, top5_catid torch.topk(probabilities, 5)for i in range(top5_prob.size(0)):print(categories[top5_catid[i]], top5_prob[i].item())
#预处理
def pre_image(image_file):input_image Image.open(image_file)preprocess transforms.Compose([transforms.Resize(256),transforms.CenterCrop(224),transforms.ToTensor(),transforms.Normalize(mean[0.485, 0.456, 0.406], std[0.229, 0.224, 0.225]),])input_tensor preprocess(input_image)inputs input_tensor.unsqueeze(0) # create a mini-batch as expected by the model# input_arr inputs.cpu().detach().numpy()return inputs #inference with model# 先加载模型结构
resnet50 torchvision.models.resnet50()
# 在加载模型权重
resnet50.load_state_dict(torch.load(save_dir))resnet50.eval()
#推理
input_batch pre_image(./images/cat_224.jpg)# move the input and model to GPU for speed if available
print(GPU Availability: , torch.cuda.is_available())
if torch.cuda.is_available():input_batch input_batch.to(cuda)resnet50.to(cuda)with torch.no_grad():output resnet50(input_batch)
# Tensor of shape 1000, with confidence scores over Imagenets 1000 classes
# print(output[0])
# The output has unnormalized scores. To get probabilities, you can run a softmax on it.
probabilities torch.nn.functional.softmax(output[0], dim0)
get_class_name(probabilities)GPU Availability: False
Persian cat 0.6668420433998108
lynx 0.023987364023923874
bow tie 0.016234245151281357
hair slide 0.013150070793926716
Japanese spaniel 0.012279157526791096input_batch.size()torch.Size([1, 3, 224, 224])#benchmark 性能
latency []
for i in range(10):with torch.no_grad():start time.time()output resnet50(input_batch)probabilities torch.nn.functional.softmax(output[0], dim0)top5_prob, top5_catid torch.topk(probabilities, 5)# for catid in range(top5_catid.size(0)):# print(categories[catid])latency.append(time.time() - start)print({} model inference CPU time:cost {} ms.format(str(i),format(sum(latency) * 1000 / len(latency), .2f)))0 model inference CPU time:cost 149.59 ms
1 model inference CPU time:cost 130.74 ms
2 model inference CPU time:cost 133.76 ms
3 model inference CPU time:cost 130.64 ms
4 model inference CPU time:cost 131.72 ms
5 model inference CPU time:cost 130.88 ms
6 model inference CPU time:cost 136.31 ms
7 model inference CPU time:cost 139.95 ms
8 model inference CPU time:cost 141.90 ms
9 model inference CPU time:cost 140.96 ms# Inference with ONNX Runtime
import onnxruntime
from onnx import numpy_helper
import time
onnx_file resnet50.onnx
session_fp32 onnxruntime.InferenceSession(onnx_file, providers[CPUExecutionProvider])
# session_fp32 onnxruntime.InferenceSession(resnet50.onnx, providers[CUDAExecutionProvider])
# session_fp32 onnxruntime.InferenceSession(resnet50.onnx, providers[OpenVINOExecutionProvider])def softmax(x):Compute softmax values for each sets of scores in x.e_x np.exp(x - np.max(x))return e_x / e_x.sum()latency []
def run_sample(session, categories, inputs):start time.time()input_arr inputsort_outputs session.run([], {conv1:input_arr})[0]output ort_outputs.flatten()output softmax(output) # this is optionaltop5_catid np.argsort(-output)[:5]# for catid in top5_catid:# print(categories[catid])latency.append(time.time() - start)return ort_outputs input_tensor pre_image(./images/cat_224.jpg)
input_arr input_tensor.cpu().detach().numpy()
for i in range(10):ort_output run_sample(session_fp32, categories, input_arr)print({} ONNX Runtime CPU Inference time {} ms.format(str(i),format(sum(latency) * 1000 / len(latency), .2f)))0 ONNX Runtime CPU Inference time 67.66 ms
1 ONNX Runtime CPU Inference time 56.30 ms
2 ONNX Runtime CPU Inference time 53.90 ms
3 ONNX Runtime CPU Inference time 58.18 ms
4 ONNX Runtime CPU Inference time 64.53 ms
5 ONNX Runtime CPU Inference time 62.79 ms
6 ONNX Runtime CPU Inference time 61.75 ms
7 ONNX Runtime CPU Inference time 60.51 ms
8 ONNX Runtime CPU Inference time 59.35 ms
9 ONNX Runtime CPU Inference time 57.57 ms4、扩展知识
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