Don't call estimator.fit(training_data) twice. (aws#1142)

Author: nadiaya

sagemaker-python-sdk/tensorflow_script_mode_using_shell_commands/tensorflow_script_mode_using_shell_commands.ipynb

@@ -299,9 +299,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "To train in SageMaker:\n",
-    "- change the estimator argument **train_instance_type** to any SageMaker ML Instance Type available for training.\n",
-    "- set the **training** channel to a S3 location."
+    "To train in SageMaker: change the estimator argument **train_instance_type** to any SageMaker ML Instance Type available for training.\n"
    ]
   },
   {
@@ -317,9 +315,7 @@
     "                       role=sagemaker.get_execution_role(),\n",
     "                       framework_version='1.14',\n",
     "                       py_version='py3',\n",
-    "                       script_mode=True)\n",
-    "\n",
-    "estimator.fit(training_data)"
+    "                       script_mode=True)\n"
    ]
   },
   {