update notebooks with python sdk get_image_url method (aws#3)

Author: Yijie Zhuang

introduction_to_applying_machine_learning/breast_cancer_prediction/Breast Cancer Prediction.ipynb

@@ -298,12 +298,8 @@
    "outputs": [],
    "source": [
     "# See 'Algorithms Provided by Amazon SageMaker: Common Parameters' in the SageMaker documentation for an explanation of these values.\n",
-    "containers = {'us-west-2': '174872318107.dkr.ecr.us-west-2.amazonaws.com/linear-learner:latest',\n",
-    "              'us-east-1': '382416733822.dkr.ecr.us-east-1.amazonaws.com/linear-learner:latest',\n",
-    "              'us-east-2': '404615174143.dkr.ecr.us-east-2.amazonaws.com/linear-learner:latest',\n",
-    "              'eu-west-1': '438346466558.dkr.ecr.eu-west-1.amazonaws.com/linear-learner:latest',\n",
-    "              'ap-northeast-1': '351501993468.dkr.ecr.ap-northeast-1.amazonaws.com/linear-learner:latest',\n",
-    "              'ap-northeast-2': '835164637446.dkr.ecr.ap-northeast-2.amazonaws.com/linear-learner:latest'}"
+    "from sagemaker.amazon.amazon_estimator import get_image_uri\n",
+    "container = get_image_uri(boto3.Session().region_name, 'linear-learner')"
    ]
   },
   {
@@ -327,7 +323,7 @@
     "    \"RoleArn\": role,\n",
     "    \"TrainingJobName\": linear_job,\n",
     "    \"AlgorithmSpecification\": {\n",
-    "        \"TrainingImage\": containers[boto3.Session().region_name],\n",
+    "        \"TrainingImage\": container,\n",
     "        \"TrainingInputMode\": \"File\"\n",
     "    },\n",
     "    \"ResourceConfig\": {\n",
@@ -439,7 +435,7 @@
    "outputs": [],
    "source": [
     "linear_hosting_container = {\n",
-    "    'Image': containers[boto3.Session().region_name],\n",
+    "    'Image': container,\n",
     "    'ModelDataUrl': sm.describe_training_job(TrainingJobName=linear_job)['ModelArtifacts']['S3ModelArtifacts']\n",
     "}\n",
     "\n",