Building, Deploying, and Orchestrating Complex Decision...
Transcript of Building, Deploying, and Orchestrating Complex Decision...
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Building, Deploying, and Orchestrating
Complex Decision Services
Jacob Feldman, PhDOpenRules Inc., CTO
www.OpenRules.com
October 22, 2020 at 2:00 PST
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2OpenRules, Inc.
Building Complex Operational Decision Services
This presentation is about building Operational Decision Services for different business domains
o Not little pilots or demos but real Maintainable Decision Services o Created, tested, and deployed on cloud by Business Analysts
We will use the main DMN Standard sample to build a library of Decision Models and Services for the Loan Origination domain
Here is our implementation plan:1. Instead of developing a large (monolithic!) decision model, we will create a library of
small reusable decision models
2. We will test each model separately
3. We will use these small models as “Lego Boxes” to create larger Decision Services and deploy them as cloud microservices
4. We will create a top-level Loan Origination Service by orchestrating smaller decision services
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How can Subject Mater Experts build Libraries of Operational Decision Models/Services?
Operational Decision Services
Operational Decision Services
Library of Decision Models and Services
(On-cloud or On-prem)
In two steps:
Decision Models Decision ServicesDeploy
STEP 1. Creating and
Testing Business Decision
Models
STEP 2. Deploying and
Orchestrating Operational
Decision Services
Externalized
Business
Logic
Decision-Making Applications
Decision
Data
Business
Logic
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From Business Decision Models to Operational Decision Services
Business
Goal 2 (Decision Model)
Business
Goal 3 (Decision Model)
Business
Goal 1 (Decision Model)
Business Goal N Orchestration
Decision Model
Business
Goal 4 (Decision Model)
Business
Goal 5 (Decision Model)
Excel
One-Click
Business
Decision
Models
Operational
Decision
Services
Deploy
Knowledge/Rules Repository
Decision
Microservice
Decision
Microservice
Decision
Microservice
Common Business
Glossary
Library of Domain-Specific Decision Models
Loosely-Coupled Decision Services
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Business Process
Pre-Bureau processing
Post-Bureau processing
DMN Loan Origination Example
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Example: DMN Loan Origination
Decision Requirements Diagram (DMN DRD)
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Example: DMN Loan Origination
The above diagram with all decision variables and relationships between them is “messy” and difficult to comprehend
We will apply the Goal-Oriented Decision Modeling Approach by selecting major goals and sub-goals, defining their internal logic using business rules, and letting a OpenRules Decision Manager to figure out all relationships and build the diagrams automatically
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Example: DMN Loan Origination
Business analysts identify 3 Main Goals:
These goals have common and specialized sub-goals like Affordability and Risk Category
Loan Origination Result(ACCEPT/DECLINE)
Bureau Strategy(BUREAU/DECLINE/THROUGH)
Routing(ACCEPT/DECLINE/REFER)
Pre-Bureau Processing Post-Bureau Processing
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Decision Goals => Separate Decision Models
Loan Origination Result(ACCEPT/DECLINE)
Bureau Strategy(BUREAU/DECLINE/THROUGH)
Affordability
Pre-Bureau(TRUE/FALSE)
Risk Category
Pre-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Routing(DECLINE/REFER/ACCEPT)
Affordability
Post-Bureau(TRUE/FALSE)
Risk Category
Post-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Glossary
Pre-Bureau Processing Post-Bureau Processing
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10OpenRules, Inc.
Let’s start with an example of a complete executable decision model
A simple decision model “Application Risk Score”
We will use only Excel and File Manager:
Rules.xls: Glossary.xls:
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11OpenRules, Inc.
Decision Model “ApplicationRiskScore”:
Test Cases
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12OpenRules, Inc.
Demo
Let’s build and test this decision model from File Manager
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13OpenRules, Inc.
Decision Model: Execution Results
Build the Decision Model and Execute Test Cases (click on “test.bat”)
Execution Results:
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How is Rules Repository organized?
One main folder “RulesRepository”
Every decision model has a separate sub-folder
The sub-folder “Common” keeps the Common Glossary in the file “Common/Glossary.xls”
Each decision model has the file “DecisionModel.xls” with the table “Environment” that describes its structure
Lets’ look at the Repository from a File Manager
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Rules Repository with multiple inter-connected decision models
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Decision Models “RiskCategoryPreBureau” / “RiskCategoryPostBureau”
Loan Origination Result(ACCEPT/DECLINE)
Bureau Strategy(BUREAU/DECLINE/THROUGH)
Affordability
Pre-Bureau(TRUE/FALSE)
Risk Category
Pre-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Routing(DECLINE/REFER/ACCEPT)
Affordability
Post-Bureau(TRUE/FALSE)
Risk Category
Post-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Glossary
Pre-Bureau Processing Post-Bureau Processing
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17OpenRules, Inc.
Risk Category
Risk Category (Pre-Bureau)
Risk Category (Post-Bureau)
The Variable Names are the
same, the logic is different!
We’ll create two decision models
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Decision Model “RiskCategoryPreBureau”
Determines the goal “Risk Category” for pre-bureau processing
Rules.xls: Glossary is extended by:
- Existing Customer (Applicant)
- Risk Category (Application)
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Decision Model “RiskCategoryPostBureau”
Determines the goal “Risk Category” for post-bureau processing
Rules.xls:
Glossary is extended by: - Existing Credit Score - New Business Concept “BureauData”
Decision tables “RiskCategoryPreBureau” and “RiskCategoryPostBureau” share the same “Risk Category” calculated differently
So, they cannot be used inside the same decision model
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Assembling Decision Models like LEGO-boxes
Decision Model “RiskCategoryPreBureau”
Decision Model “ApplicationRiskScore”
Decision Model “RiskCategoryPostBureau”
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Decision Models “AffordabilityPreBureau” / “AffordabilityPostBureau”
Loan Origination Result(ACCEPT/DECLINE)
Bureau Strategy(BUREAU/DECLINE/THROUGH)
Affordability
Pre-Bureau(TRUE/FALSE)
Risk Category
Pre-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Routing(DECLINE/REFER/ACCEPT)
Affordability
Post-Bureau(TRUE/FALSE)
Risk Category
Post-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Glossary
Pre-Bureau Processing Post-Bureau Processing
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Common Decision Rules for “Affordability”
Rules.xls:
We will be in trouble if
we try to manually
define all inter-table
relationships even
using friendly diagrams.
Rule engine should
figure them out
automatically!
We need two Decision Models:
- AffordabilityPreBureau
- AffordabilityPostBureau
- Same rules but different Environment tables
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Decision Models for “Affordability”
We will place the above rules in the file “Affordability/Rules.xls”
We will create two folders “AffordabilityPreBureau” and “AffordabilityPostBureau” with different Environment tables:
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Decision Model “BureauStrategy”
Loan Origination Result(ACCEPT/DECLINE)
Bureau Strategy(BUREAU/DECLINE/THROUGH)
Affordability
Pre-Bureau(TRUE/FALSE)
Risk Category
Pre-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Routing(DECLINE/REFER/ACCEPT)
Affordability
Post-Bureau(TRUE/FALSE)
Risk Category
Post-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Glossary
Pre-Bureau Processing Post-Bureau Processing
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Decision Model “BureauStrategy”
Determines the goal “Bureau Strategy” for pre-bureau processing
Rules.xls:
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Execution path:- ApplicationRiskScore
- PreBureauRiskCategory
- PMT
- RequiredMonthlyInstallment
- DisposableIncome
- CreditContingencyFactor
- Affordability
- Eligibility
- BureauCallType
- BureauStrategy
Decision Model “BureauStrategy” – Decision Requirement Diagram
Here is an automatically generated DRD and Execution Path:
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BureauStrategy
Execution Results
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Decision Model “Routing”
Loan Origination Result(ACCEPT/DECLINE)
Bureau Strategy(BUREAU/DECLINE/THROUGH)
Affordability
Pre-Bureau(TRUE/FALSE)
Risk Category
Pre-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Routing(DECLINE/REFER/ACCEPT)
Affordability
Post-Bureau(TRUE/FALSE)
Risk Category
Post-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Glossary
Pre-Bureau Processing Post-Bureau Processing
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Decision Model “Routing”
Determines the goal “Routing” for post-bureau processing
Rules.xls:
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Decision Model “Routing” – Decision Requirement Diagram
Here is an automatically generated DRD and Execution Path:
Execution path:- ApplicationRiskScore
- PostBureauRiskCategory
- PMT
- RequiredMonthlyInstallment
- DisposableIncome
- CreditContingencyFactor
- Affordability
- Routing
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Decision Model “Routing”
Execution Results
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Common Glossary
Glossary.xls
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Deployment and Orchestration of Decision Services
Loan Origination Result(ACCEPT/DECLINE)
Bureau Strategy(BUREAU/DECLINE/THROUGH)
Routing(DECLINE/REFER/ACCEPT)
We cannot assemble decision model for “Loan Origination Result” using include-statements inside Environment table because decision models BureauStrategy and Routing share the same variables “Risk Category” and “Affordability”
But we can invoke them as independent Decision Services, e.g. deployed as AWS Lambda functions
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Deploying Decision Models
Develop Decision Model Deploy as Service Execute
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Decision Models => Decision Microservices
OpenRules supports one-click deployment of decision models on cloud as AWS Lambda functions
Deploy: click on the standard file “deployLambda.bat”
Test: click on the automatically generated “testLambda.bat”
We deploy two main AWS lambda functions:
BureauStrategy
Routing
Test deployed decision services
Now we are ready to orchestrate them
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Orchestration Decision Model “Loan Origination Result”
Loan Origination Result(ACCEPT/DECLINE)
Bureau Strategy(BUREAU/DECLINE/THROUGH)
Affordability
Pre-Bureau(TRUE/FALSE)
Risk Category
Pre-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Routing(DECLINE/REFER/ACCEPT)
Affordability
Post-Bureau(TRUE/FALSE)
Risk Category
Post-Bureau (DECLINE/HIGH/MEDIUM/LOW/VERY LOW)
Application Risk Score (0-900)
Glossary
Pre-Bureau Processing Post-Bureau Processing
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Orchestration Logic is Business Logic!
ActionExecute can execute
- internal decision tables or
- external decision services (!)
We will build the Orchestration Decision Model “Result”
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Test and Deploy the final decision model “Result”
We can test decision model “Result” by a click on “test.bat”:
Now we can also deploy and test the top-level decision model “Loan Origination Result” as an AWS Lambda function
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Summary: We’ve created a Library of executable Decision Models and Decision Microservices (without programming)
Business
Goal 2 (Decision Model)
Business
Goal 3 (Decision Model)
Business
Goal 1 (Decision Model)
Main Business Goal Orchestration Decision
Model
Business
Goal 4 (Decision Model)
Business
Goal 5 (Decision Model)
Excel
One-Click
Business
Decision
Models
Operational
Decision
Services
Deployment
Knowledge/Rules Repository
Decision
Microservice
Decision
Microservice
Decision
Microservice
Common Business
Glossary
Library of Domain-Specific Decision Models
Loosely-Coupled Decision Services