fix keras import and add pdb debugger example to notebook (#82)

Author: amygdala

INSTALL.md

@@ -15,7 +15,7 @@ Then install the following into your virtual environment:
 
 -  Install [Jupyter](https://jupyter.org/install.html). 
 
-- Optionally, install `matplotlib`. (If you're using a conda virtual environment, use `conda install matplotlib`.)
+- Optionally, install `pandas` and `matplotlib`. (If you're using a conda virtual environment, use `conda install matplotlib`.)
 
 ### Test your installation
 

workshop_sections/high_level_APIs/mnist_eager_keras-debug.ipynb

@@ -42,13 +42,10 @@
      }
     },
     "colab_type": "code",
-    "collapsed": true,
     "id": "zX-y0FVXrd_l"
    },
    "outputs": [],
    "source": [
-    "from tensorflow import keras\n",
-    "\n",
     "from tensorflow.python.keras.layers import Dense, Dropout, Activation, Flatten\n",
     "from tensorflow.python.keras.layers import Convolution2D, MaxPooling2D"
    ]
@@ -105,7 +102,7 @@
    },
    "outputs": [],
    "source": [
-    "from keras.datasets import fashion_mnist\n",
+    "from tensorflow.python.keras._impl.keras.datasets import fashion_mnist\n",
     "\n",
     "(x_train, y_train), (x_test, y_test) = fashion_mnist.load_data()\n",
     "\n",
@@ -225,13 +222,13 @@
      }
     },
     "colab_type": "code",
-    "collapsed": true,
     "id": "VxmgSrb9118w"
    },
    "outputs": [],
    "source": [
     "def loss(model, x, y):\n",
     "  y_ = model(x)\n",
+    "  # import pdb; pdb.set_trace()\n",
     "  return tf.losses.sparse_softmax_cross_entropy(labels=y, logits=y_)\n",
     "\n",
     "\n",
@@ -273,7 +270,6 @@
      }
     },
     "colab_type": "code",
-    "collapsed": true,
     "id": "i1PcGU6n18zz"
    },
    "outputs": [],
@@ -448,7 +444,6 @@
      }
     },
     "colab_type": "code",
-    "collapsed": true,
     "id": "ruV-pM0Le9G7"
    },
    "outputs": [],