Getting Started with DSPy.rb

Welcome to DSPy.rb! This guide will help you get up and running with building reliable LLM applications in Ruby.

What is DSPy.rb?

DSPy.rb is a Ruby framework for building predictable LLM applications using composable, type-safe modules. Instead of wrestling with prompt engineering, you define clear interfaces and let the framework handle the complexity.

Key Features

• Type-safe interfaces using Sorbet for compile-time checking
• Composable modules for building complex reasoning chains
• Systematic testing with comprehensive test coverage
• Production-ready with Rails and Ruby ecosystem integration

Quick Example

Here’s a simple example of defining an LLM interface with DSPy.rb:

class EmailCategory < T::Enum
  enums do
    Technical = new('technical')
    Billing = new('billing')
    General = new('general')
  end
end

class EmailClassifier < DSPy::Signature
  input do
    const :subject, String
    const :body, String
  end
  
  output do
    const :category, EmailCategory
    const :confidence, Float
  end
end

# Use the classifier
classifier = DSPy::Predict.new(EmailClassifier)
result = classifier.call(
  subject: "Invoice for March 2024",
  body: "Please find attached your invoice..."
)

puts result.category    # => EmailCategory::Billing
puts result.confidence  # => 0.95

What’s Next?