A lambda to perform data pre-processing on new data put into an S3 bucket. An assumption has been made that new data uploaded will be of the same format e.g. same features, data schema etc. Actions performed not limited to removing missing data, imputing numerical values and/or categorical values etc.

This repository does not create the S3 Bucket, this is created via Terraform found here terraform-aws-machine-learning-pipeline. Data uploaded into these buckets can be found here ml-data-copy-to-aws-s3. Additionally, data preparation is specific to a specific set of data found within the GitHub repository.

The diagram below demonstrates what happens when the lambda is trigger, when a new .csv object has been uploaded to the S3 Bucket.

graph LR
  S0(Start)
  T1(Pull dataset from S3 Bucket)
  T2(Dataset transformed using Pandas)
  T3(Upload transformed data to output bucket)
  T4(Tag original dataset as processed)
  E0(End)

  S0-->T1
  T1-->T2
  T2-->T3
  T3-->T4
  T4-->E0

• Python
• Docker for Desktop
• Amazon Web Services

1. Build the docker image locally:

   docker build --no-cache -t data-preprocessing:local .
   

2. Run the docker image built:

   docker run --platform linux/amd64 -p 9000:8080 data-preprocessing:local
   

3. Send an event to the lambda via curl:

   curl "http://localhost:9000/2015-03-31/functions/function/invocations" -d '{<REPLACE_WITH_JSON_BELOW>}'
   

   {
     "Records": [
       {
         "eventVersion": "2.1",
         "eventSource": "aws:s3",
         "awsRegion": "eu-west-2",
         "eventTime": "2023-12-01T21:48:58.339Z",
         "eventName": "ObjectCreated:Put",
         "userIdentity": { "principalId": "AWS:ABCDEFGHIJKLMNOPKQRST" },
         "requestParameters": { "sourceIPAddress": "127.0.0.1" },
         "responseElements": {
           "x-amz-request-id": "BY65CG6WZD6HBVX2",
           "x-amz-id-2": "c2La85nMEE2WBGPHBXDc5a8fd28kEpGt/QsP8n/xmbLv0ZAJeqsK/XmNcCCS+phWuVz8KP3/gn3Ql3/z7RPyC3n176rqpzvZ"
         },
         "s3": {
           "s3SchemaVersion": "1.0",
           "configurationId": "huh",
           "bucket": {
             "name": "example-bucket-name",
             "ownerIdentity": { "principalId": "ABCDEFGHIJKLMN" },
             "arn": "arn:aws:s3:::example-bucket-name"
           },
           "object": {
             "key": "data/bank-additional.csv",
             "size": 515246,
             "eTag": "0e29c0d99c654bbe83c42097c97743ed",
             "sequencer": "00656A54CA3D69362D"
           }
         }
       }
     ]
   }

The GitHub Action "🚀 Push Docker image to AWS ECR" will check out the repository and push a docker image to the chosen AWS ECR using configure-aws-credentials action. The following repository secrets need to be set: