tf.mul -> tf.multiply (#143)

notebooks/2_BasicModels/linear_regression.ipynb

@@ -84,7 +84,7 @@
    "outputs": [],
    "source": [
     "# Construct a linear model\n",
-    "pred = tf.add(tf.mul(X, W), b)"
+    "pred = tf.add(tf.multiply(X, W), b)"
    ]
   },
   {