Section 4b - Encrypted Keras Client.ipynb

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   "cell_type": "markdown",
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   "source": [
    "# Step 2: Private Prediction using Syft Keras - Serving (Client)\n",
    "\n",
    "_Demo Ref: https://github.com/OpenMined/PySyft/tree/dev/examples/tutorials_\n",
    "\n",
    "Congratulations! After training your model with normal Keras and securing it with Syft Keras, you are ready to request some private predictions. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import tensorflow as tf\n",
    "from tensorflow.keras.datasets import mnist\n",
    "\n",
    "import syft as sy"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "# input image dimensions\n",
    "img_rows, img_cols = 28, 28\n",
    "\n",
    "# the data, split between train and test sets\n",
    "(x_train, y_train), (x_test, y_test) = mnist.load_data()\n",
    "\n",
    "x_train = x_train.reshape(x_train.shape[0], img_rows, img_cols, 1)\n",
    "x_test = x_test.reshape(x_test.shape[0], img_rows, img_cols, 1)\n",
    "input_shape = (img_rows, img_cols, 1)\n",
    "\n",
    "x_train = x_train.astype('float32')\n",
    "x_test = x_test.astype('float32')\n",
    "x_train /= 255\n",
    "x_test /= 255"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "num_classes = 10\n",
    "input_shape = (1, 28, 28, 1)\n",
    "output_shape = (1, num_classes)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "INFO:tf_encrypted:Starting session on target 'grpc://localhost:4000' using config graph_options {\n",
      "}\n",
      "\n"
     ]
    }
   ],
   "source": [
    "client = sy.TFEWorker()\n",
    "\n",
    "alice = sy.TFEWorker(host='localhost:4000')\n",
    "bob = sy.TFEWorker(host='localhost:4001')\n",
    "carol = sy.TFEWorker(host='localhost:4002')\n",
    "\n",
    "client.connect_to_model(input_shape, output_shape, alice, bob, carol)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "# User inputs\n",
    "num_tests = 3\n",
    "images, expected_labels = x_test[:num_tests], y_test[:num_tests]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The image had label 7 and was correctly classified as 7\n",
      "The image had label 2 and was correctly classified as 2\n",
      "The image had label 1 and was correctly classified as 1\n"
     ]
    }
   ],
   "source": [
    "for image, expected_label in zip(images, expected_labels):\n",
    "\n",
    "    res = client.query_model(image.reshape(1, 28, 28, 1))\n",
    "    predicted_label = np.argmax(res)\n",
    "\n",
    "    print(\"The image had label {} and was {} classified as {}\".format(\n",
    "        expected_label,\n",
    "        \"correctly\" if expected_label == predicted_label else \"wrongly\",\n",
    "        predicted_label))"
   ]
  }
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