Add Python integration

Tools/WinML-Dashbaord/src/python.js

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+const { execFile, execFileSync } = require('child_process');
+const fs = require('fs');
+const https = require('https');
+const path = require('path');
+const unzipper = require('unzipper');
+const util = require('util');
+
+const appData = process.env.APPDATA ||
+    path.join(process.env.HOME, process.platform == 'darwin' ? 'Library/Preferences' : '.local/share');
+
+function mkdir(...directory) {
+    directory = path.join(...directory);
+    if (!fs.existsSync(directory)) {
+        fs.mkdirSync(directory);
+    }
+    return directory;
+}
+
+function filterPythonBinaries(binaries) {
+    // Look for binaries with venv support
+    return binaries.filter((binary) => {
+        try {
+            execFileSync(binary, ['-c', 'import venv']);
+            return true;
+        } catch(_) {}
+    }, []);
+}
+
+function getPythonBinaries() {
+    const localPython = path.join(appData, 'WinML-Dashboard/python/python')
+    const binaries = filterPythonBinaries([localPython, 'python3', 'py', 'python'])
+    if (process.platform === 'win32' && binaries[0] !== localPython) {
+        binaries.push(null);  // use null to represent local, embedded version
+    }
+    return binaries;
+}
+
+function downloadPython(success, error) {
+    if (process.platform !== 'win32') {
+        throw new Error('Unsupported platform');
+    }
+    const pythonUrl = 'https://www.python.org/ftp/python/3.7.0/python-3.7.0-embed-amd64.zip';
+    const appFolder = mkdir(appData, 'WinML-Dashboard');
+    const pythonFolder = mkdir(appFolder, 'python');
+    https.get(pythonUrl, response =>
+        response.pipe(unzipper.Extract({ path: pythonFolder }))
+        .on('finish', success)
+        .on('error', error));
+}
+
+async function installVenv(targetPython) {
+    const execFilePromisse = util.promisify(execFile);
+    const venv = path.join(mkdir(appData, 'WinML-Dashboard'), 'venv');
+
+    await execFilePromisse(targetPython, ['-m', 'venv', venv]);
+    const python = filterPythonBinaries([path.join(venv, 'bin/python'), path.join(venv, 'Scripts/python')])[0];
+    async function pip(...command) {
+        return await execFilePromisse(python, ['-m', 'pip', ...command]);
+    }
+    await pip('install', '-U', 'pip')
+    await pip('install', '-r', path.join(__dirname, 'requirements.txt'))
+}
+
+module.exports = {
+    downloadPython,
+    getPythonBinaries,
+    installVenv,
+};

Tools/WinML-Dashbaord/src/requirements.txt

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+-e git+https://github.com/apple/coremltools@ad3e24d875972cd2242b531e80d99d92ae215dec#egg=coremltools
+h5py==2.8.0
+Keras==2.2.2
+Keras-Applications==1.0.4
+Keras-Preprocessing==1.0.2
+numpy==1.15.0
+onnx==1.2.2
+-e git+https://github.com/onnx/onnxmltools@708d3091084da1acf42cf058161017e1152fa337#egg=onnxmltools
+protobuf==3.6.0
+PyYAML==3.13
+scikit-learn==0.19.2
+scipy==1.1.0
+six==1.10.0
+typing==3.6.4
+typing-extensions==3.6.5