Encoding codec used by Python 3 pickle (#13)

* fixed decode error while using Python 3

* minor fix

* encoding as kwarg

examples/MNIST example.ipynb

@@ -389,6 +389,7 @@
     "import pickle\n",
     "import subprocess\n",
     "import os\n",
+    "import sys \n",
     "\n",
     "rs = RandomState(seed)\n",
     "fl = 'data/mnist/mnist.pkl'\n",
@@ -401,7 +402,14 @@
     "\n",
     "def _load_from_pickle():\n",
     "    with open(fl, 'rb') as f:\n",
-    "        d = pickle.load(f)\n",
+    "        if (sys.version_info > (3, 0)):\n",
+    "            # content of file encoded using Python 3 \n",
+    "            print(\"Encoded using Python 3\")\n",
+    "            d = pickle.load(f, encoding=\"latin1\")\n",
+    "        else:\n",
+    "            # content of file encoded using Python 2\n",
+    "            print(\"Encoded using Python 2\")\n",
+    "            d = pickle.load(f)\n",
     "        \n",
     "    X, y = d['data'], d['labels']\n",
     "    min_mask = y == min_label\n",
@@ -1020,23 +1028,23 @@
  "metadata": {
   "anaconda-cloud": {},
   "kernelspec": {
-   "display_name": "Python [Root]",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "Python [Root]"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 2
+    "version": 3
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.12"
+   "pygments_lexer": "ipython3",
+   "version": "3.6.8"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 0
+ "nbformat_minor": 2
 }