remove credentials import (#101)

Author: jesterhazy

sagemaker-python-sdk/mxnet_gluon_cifar10/cifar10.ipynb

@@ -19,7 +19,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import credentials # put your credentials in credentials.py\n",
     "import os\n",
     "import boto3\n",
     "import sagemaker\n",
@@ -96,7 +95,7 @@
    "source": [
     "## Run the training script on SageMaker\n",
     "\n",
-    "The ```MXNet``` class allows us to run our training function as a distributed training job on SageMaker infrastructure. We need to configure it with our training script, an IAM role, the number of training instances, and the training instance type. In this case we will run our training job on four `ml.p2.xlarge` instances. "
+    "The ```MXNet``` class allows us to run our training function as a distributed training job on SageMaker infrastructure. We need to configure it with our training script, an IAM role, the number of training instances, and the training instance type. In this case we will run our training job on two `ml.p2.xlarge` instances."
    ]
   },
   {
@@ -107,7 +106,7 @@
    "source": [
     "m = MXNet(\"cifar10.py\", \n",
     "          role=role, \n",
-    "          train_instance_count=4, \n",
+    "          train_instance_count=2, \n",
     "          train_instance_type=\"ml.p2.xlarge\",\n",
     "          hyperparameters={'batch_size': 128, \n",
     "                           'epochs': 50, \n",