Mastering Azure AI: Building a Custom Form Recognizer Model

Table of Contents:

1. Introduction to Azure Form Recognizer
2. Understanding Custom Models in Form Recognizer
   • Key File Types and Size Limits for Training
   • Best Practices for Data Selection
3. Memory Techniques for Retaining Key Concepts
4. Practical Use Cases of Azure Form Recognizer
   • Automating Invoice Processing
   • Streamlining Document Scanning in Healthcare
5. Implementing Form Recognizer in Azure
   • Using Azure Portal
   • Azure CLI Commands for Setup
6. Conclusion: Leveraging Azure Form Recognizer for Business Success

---

Introduction to Azure Form Recognizer:

Azure Form Recognizer is a powerful tool within the Azure AI suite, specifically designed for extracting text, key-value pairs, and tables from documents like invoices, receipts, and forms. This service uses pre-trained machine learning models, but users can also train custom models to work with documents that have a unique structure.

In this blog, we will explore how to build a custom Form Recognizer model, the types of files used for training, and how to select appropriate files based on file type and size. We will also demonstrate how to implement this service using Azure CLI commands and the Azure portal.

---

Understanding Custom Models in Form Recognizer:

To train a custom model in Azure Form Recognizer, you need to upload training documents (files), which could be PDFs, JPGs, or other supported formats. In the scenario provided, you are given several files of different formats and sizes for model training.

Key File Types and Size Limits for Training:

Azure Form Recognizer supports certain file types and imposes limits on file sizes:

• Supported File Types: PDF, JPG, PNG, and TIFF.
• File Size Limit: Typically, files should be under 50 MB for PDFs and 20 MB for image files like JPG or PNG.

Evaluating the Files:

In the image provided, the following files are listed:

Name	Type	Size
File1	PDF	20 MB
File2	MP4	100 MB
File3	JPG	20 MB
File4	PDF	100 MB
File5	GIF	1 MB
File6	JPG	40 MB

• File2 (MP4) is not supported, as Form Recognizer does not work with video files.
• File4 (PDF, 100 MB) exceeds the size limit for PDFs (50 MB).
• File5 (GIF) is not a supported file type.

Thus, the files that can be used for training are:

• File1 (PDF, 20 MB) – Under the PDF size limit.
• File3 (JPG, 20 MB) – Under the image size limit.
• File6 (JPG, 40 MB) – Acceptable because images can be up to 50 MB.

Best Practices for Data Selection:

• Always ensure the files conform to the supported formats and size limits.
• Ensure that the data in the files is clean and representative of the types of documents you want the model to process in production.

---

Memory Techniques for Retaining Key Concepts:

To retain the critical points of file selection for training models in Azure Form Recognizer, here’s a mnemonic to help you:

"PJ Limited" —

• P: PDF (limit is 50 MB)
• J: JPG/JPEG and other image formats (limit is 20 MB, sometimes up to 50 MB)

Alternatively, think of Azure Form Recognizer as a library scanner:

• It can handle books (PDF) up to a certain thickness (50 MB),
• and photographs (images) up to a certain size (20-50 MB).

---

Practical Use Cases of Azure Form Recognizer:

1. Automating Invoice Processing:

Azure Form Recognizer can automatically extract information such as invoice numbers, due dates, and amounts from large volumes of invoices, streamlining accounting processes.

2. Streamlining Document Scanning in Healthcare:

Hospitals and clinics can digitize patient intake forms or medical reports, using Form Recognizer to extract structured data for electronic health records (EHR) systems.

---

Implementing Form Recognizer in Azure:

Using Azure Portal:

1. Navigate to the Azure Portal and search for Form Recognizer.
2. Create a Form Recognizer resource by choosing the subscription, resource group, and region.
3. Once created, navigate to the Form Recognizer Studio to start uploading files and training custom models.

Azure CLI Commands for Setup:

1. Create a Resource Group:

   bash
   
   az group create --name myResourceGroup --location eastus
   

2. Create a Form Recognizer Resource:

   bash
   
   az cognitiveservices account create \
   --name myFormRecognizer \
   --resource-group myResourceGroup \
   --kind FormRecognizer \
   --sku S0 \
   --location eastus \
   --yes
   

3. Retrieve the API Key:

   bash
   az cognitiveservices account keys list \
   --name myFormRecognizer \
   --resource-group myResourceGroup
   

These commands will help you get started with setting up your Form Recognizer service using the Azure CLI.

---

Conclusion: Leveraging Azure Form Recognizer for Business Success:

Azure Form Recognizer is a highly flexible and powerful tool that enables businesses to automate the processing of structured and unstructured documents. Whether it’s handling invoices, healthcare forms, or any custom form, this tool significantly reduces manual labor, minimizes errors, and improves operational efficiency.

By understanding how to select appropriate training files and setting up the service programmatically, you can quickly build and deploy custom models tailored to your specific business needs.