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server.js
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server.js
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const bodyParser = require('body-parser');
const express = require('express');
const path = require('path');
const app = express();
const cntk = require('node-cntk');
const modelPath = path.join(__dirname, 'models/mnist_conv.cmf')
var model = null;
app.use(express.static('public'))
app.use(bodyParser.json()); // support json encoded bodies
app.use(bodyParser.urlencoded({ extended: true })); // support encoded bodies
app.post('/recognize', function(req, res) {
// For now just get an array from the client..
var dataInput = [req.body.payload];
model.eval(dataInput, (err, evalResult) =>{
if (err) {
console.info('Error during eval:', err);
res.end(err.toString(), 400);
return;
}
// so we use argmax to get the index of the highest value
var digit = cntk.utils.argmax(evalResult.output[0]);
responseBody = JSON.stringify({
'digit' : digit
});
console.info('Request processed, recognized digit is: ', digit)
res.end(responseBody , 200);
});
});
console.info("Try setting CNTK device to GPU");
try {
cntk.setDefaultDeviceSync(cntk.devices.gpu);
}
catch(ex) {
console.info("Failed setting CNTK GPU device, setting to CPU instead");
cntk.setDefaultDeviceSync(cntk.devices.cpu);
}
console.info('Trying to load model at:', modelPath)
cntk.loadModel(modelPath, (err, loadedModel) => {
if (err) {
console.info('Got error while loading CNTK model:', err);
return;
}
console.info('CNTK model was loaded succesfully');
model = loadedModel;
var port = process.env.PORT || 3000;
app.listen(port, function () {
console.log('node-cntk MNIST sample app listening on port 3000')
});
});