Class: Ragnar::UmapTransformService

Inherits:
Object
  • Object
show all
Defined in:
lib/ragnar/umap_transform_service.rb

Overview

Service for applying UMAP transformations to embeddings Separates transformation logic from training (UmapProcessor)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model_path: "umap_model.bin", database:) ⇒ UmapTransformService

Returns a new instance of UmapTransformService.



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# File 'lib/ragnar/umap_transform_service.rb', line 10

def initialize(model_path: "umap_model.bin", database:)
  @model_path = model_path
  @database = database
  @umap_model = nil
  @model_metadata = nil
end

Instance Attribute Details

#database ⇒ Object (readonly)

Returns the value of attribute database.



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# File 'lib/ragnar/umap_transform_service.rb', line 8

def database
  @database
end

#model_path ⇒ Object (readonly)

Returns the value of attribute model_path.



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# File 'lib/ragnar/umap_transform_service.rb', line 8

def model_path
  @model_path
end

Class Method Details

.instance ⇒ Object 



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# File 'lib/ragnar/umap_transform_service.rb', line 201

def instance
  UmapTransformServiceSingleton.instance
end

Instance Method Details

#check_model_staleness ⇒ Hash

Check if model needs retraining based on staleness

Returns:

  • (Hash) —

    Staleness info with :needs_retraining, :coverage_percentage



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# File 'lib/ragnar/umap_transform_service.rb', line 131

def check_model_staleness
  return { needs_retraining: true, coverage_percentage: 0, reason: "No model exists" } unless model_exists?
  
  metadata = model_metadata
  return { needs_retraining: true, coverage_percentage: 0, reason: "No metadata found" } unless metadata
  
  trained_count = metadata[:document_count] || 0
  current_count = @database.document_count
  
  if current_count == 0
    return { needs_retraining: false, coverage_percentage: 100, reason: "No documents" }
  end
  
  coverage = (trained_count.to_f / current_count * 100).round(1)
  staleness = 100 - coverage
  
  {
    needs_retraining: staleness > 30,
    coverage_percentage: coverage,
    trained_documents: trained_count,
    current_documents: current_count,
    staleness_percentage: staleness,
    reason: staleness > 30 ? "Model covers only #{coverage}% of documents" : "Model is up to date"
  }
end

#model_exists? ⇒ Boolean

Check if a UMAP model exists

Returns:

  • (Boolean) —

    true if model file exists



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# File 'lib/ragnar/umap_transform_service.rb', line 104

def model_exists?
  File.exist?(@model_path)
end

#model_metadata ⇒ Hash?

Get metadata about the trained model

Returns:

  • (Hash, nil) —

    Model metadata or nil if not found



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# File 'lib/ragnar/umap_transform_service.rb', line 110

def model_metadata
  return @model_metadata if @model_metadata
  
  metadata_path = @model_path.sub(/\.bin$/, '_metadata.json')
  return nil unless File.exist?(metadata_path)
  
  @model_metadata = JSON.parse(File.read(metadata_path), symbolize_names: true)
rescue => e
  puts "Error loading model metadata: #{e.message}"
  nil
end

#model_version ⇒ Integer

Get the version of the current model

Returns:

  • (Integer) —

    Model version (timestamp of file modification)



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# File 'lib/ragnar/umap_transform_service.rb', line 124

def model_version
  return 0 unless File.exist?(@model_path)
  File.mtime(@model_path).to_i
end

#transform_documents(document_ids) ⇒ Hash

Transform embeddings for specific documents

Parameters:

  • document_ids (Array<Integer>) —

    IDs of documents to transform

Returns:

  • (Hash) —

    Results with :processed, :skipped, :errors counts



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# File 'lib/ragnar/umap_transform_service.rb', line 20

def transform_documents(document_ids)
  return { processed: 0, skipped: 0, errors: 0 } if document_ids.empty?
  
  load_model!
  
  # Fetch documents
  documents = @database.get_documents_by_ids(document_ids)
  
  if documents.empty?
    return { processed: 0, skipped: 0, errors: 0 }
  end
  
  # Extract and validate embeddings
  valid_docs = []
  embeddings_to_transform = []
  skipped_count = 0
  
  documents.each do |doc|
    emb = doc[:embedding]
    
    if emb.nil? || !emb.is_a?(Array) || emb.empty?
      skipped_count += 1
      next
    end
    
    if emb.any? { |v| !v.is_a?(Numeric) || v.nan? || !v.finite? }
      skipped_count += 1
      next
    end
    
    valid_docs << doc
    embeddings_to_transform << emb
  end
  
  return { processed: 0, skipped: skipped_count, errors: 0 } if embeddings_to_transform.empty?
  
  # Transform using UMAP
  begin
    reduced_embeddings = @umap_model.transform(embeddings_to_transform)
    
    # Prepare updates
    updates = valid_docs.zip(reduced_embeddings).map do |doc, reduced_emb|
      {
        id: doc[:id],
        reduced_embedding: reduced_emb,
        umap_version: model_version
      }
    end
    
    # Update database
    @database.update_reduced_embeddings(updates)
    
    { processed: updates.size, skipped: skipped_count, errors: 0 }
  rescue => e
    puts "Error transforming documents: #{e.message}"
    { processed: 0, skipped: skipped_count, errors: valid_docs.size }
  end
end

#transform_query(embedding) ⇒ Array<Float>?

Transform a single query embedding

Parameters:

  • embedding (Array<Numeric>) —

    Query embedding to transform

Returns:

  • (Array<Float>, nil) —

    Reduced embedding or nil if error



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# File 'lib/ragnar/umap_transform_service.rb', line 82

def transform_query(embedding)
  return nil if embedding.nil? || !embedding.is_a?(Array) || embedding.empty?
  
  # Validate embedding
  if embedding.any? { |v| !v.is_a?(Numeric) || v.nan? || !v.finite? }
    puts "Warning: Invalid query embedding (contains NaN or Infinity)"
    return nil
  end
  
  load_model!
  
  begin
    # Transform returns array of arrays, get first (and only) result
    @umap_model.transform([embedding]).first
  rescue => e
    puts "Error transforming query: #{e.message}"
    nil
  end
end