从带有子进程的nodejs应用调用时python无法正常工作 [英] python not working correctly when called from nodejs app with child-process

问题描述

我正在尝试运行一个使用深度学习模型对图像进行分类的python脚本（无论是否为NSFW），我在这里使用此脚本 https://github.com/yahoo/open_nsfw 和一个自定义模型。直接用python调用时python脚本运行正常，但是通过子进程从nodejs应用程序调用时，脚本在此行停止

Im trying to run a python script that used deep learning model to classify an image wether it is NSFW or not, i use this script from here https://github.com/yahoo/open_nsfw and a custom model. The python script runs ok when called directly with python, but when called from nodejs app via child-process, the script stops at this line

# Pre-load caffe model.
nsfw_net = caffe.Net(model_def, pretrained_model, caffe.TEST)

其他所有内容python工作正常。而且脚本直接运行也很好。为什么从子进程调用时它不起作用？

Everything else in python works fine. And the script run directly works fine too. Why it is not working when called from child-process?

当我从这样的节点应用程序运行时

When i run it from a node app like this

    const cp = require("child_process")
    const spawn = cp.spawn;
    const pythonProcess = spawn('python',['/home/ubuntu/classify.py']);

    pythonProcess.stdin.write(req.body.image, function(err){
        pythonProcess.stdin.end();
    });

    pythonProcess.stdout.on('data', (data) => {
            console.log("message from python:" + data)
        });

    pythonProcess.stdout.on("end", (data) => {
        console.log("end received data: " + data);
        res.status(200);
        res.end(); 
    });

推荐答案

我已通过添加 pythonProcess.stderr.pipe（process.stderr）; 到我的nodejs应用程序，然后我能够看到python错误并进行了修复。 python脚本中有错误。

I have fixed this by adding pythonProcess.stderr.pipe(process.stderr); to my nodejs app and then i was able to see python errors and fixed them. There were mistakes in the python script.

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