Class: Transformers::QuestionAnsweringArgumentHandler

Inherits:
ArgumentHandler show all
Defined in:
lib/transformers/pipelines/question_answering.rb

Instance Method Summary collapse

Instance Method Details

#call(*args, **kwargs) ⇒ Object 



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# File 'lib/transformers/pipelines/question_answering.rb', line 22

def call(*args, **kwargs)
  # Detect where the actual inputs are
  if args.any?
    if args.length == 1
      inputs = args[0]
    elsif args.length == 2 && args.all? { |el| el.is_a?(String) }
      inputs = [{question: args[0], context: args[1]}]
    else
      inputs = args.to_a
    end
  elsif kwargs.include?(:question) && kwargs.include?(:context)
    if kwargs[:question].is_a?(Array) && kwargs[:context].is_a?(String)
      inputs = kwargs[:question].map { |q| {question: q, context: kwargs[:context]} }
    elsif kwargs[:question].is_a?(Array) && kwargs[:context].is_a?(Array)
      if kwargs[:question].length != kwargs[:context].length
        raise ArgumentError, "Questions and contexts don't have the same lengths"
      end

      inputs = kwargs[:question].zip(kwargs[:context]).map { |q, c| {question: q, context: c} }
    elsif kwargs[:question].is_a?(String) && kwargs[:context].is_a?(String)
      inputs = [{question: kwargs[:question], context: kwargs[:context]}]
    else
      raise ArgumentError, "Arguments can't be understood"
    end
  else
    raise ArgumentError, "Unknown arguments #{kwargs}"
  end

  # Normalize inputs
  if inputs.is_a?(Hash)
    inputs = [inputs]
  elsif inputs.is_a?(Enumerable)
    # Copy to avoid overriding arguments
    inputs = inputs.to_a.dup
  else
    raise ArgumentError, "Invalid arguments #{kwargs}"
  end

  inputs.each_with_index do |item, i|
    inputs[i] = normalize(item)
  end

  inputs
end

#normalize(item) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/transformers/pipelines/question_answering.rb', line 3

def normalize(item)
  if item.is_a?(SquadExample)
    return item
  elsif item.is_a?(Hash)
    [:question, :context].each do |k|
      if !item.include?(k)
        raise KeyError, "You need to provide a dictionary with keys {question:..., context:...}"
      elsif item[k].nil?
        raise ArgumentError, "`#{k}` cannot be nil"
      elsif item[k].is_a?(String) && item[k].length == 0
        raise ArgumentError, "`#{k}` cannot be empty"
      end
    end

    return QuestionAnsweringPipeline.create_sample(**item)
  end
  raise ArgumentError, "#{item} argument needs to be of type (SquadExample, dict)"
end