Class: IPXACT::Tools::InterruptLineDetector

Inherits:
Object
  • Object
show all
Defined in:
lib/ipxact_tools/interrupt_line_detector.rb

Overview

InterruptLineDetector instances are used for detecting interrupt lines from a data path.

Author:

  • Guillaume Godet-Bar

Constant Summary collapse

@@detector_stats = 
YAML.load(File.open(File.join(File.dirname(__FILE__), '../../config/detector.yml')).read)

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.convert_pairs(pairs) ⇒ Object 



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# File 'lib/ipxact_tools/interrupt_line_detector.rb', line 85

def self.convert_pairs(pairs)
  pairs.collect do |pair|
    regex = Regexp.new(pair[0].gsub(/^\/(.+)\/.?$/, '\1'), pair[0].end_with?('i'))
    [regex, pair[1]]
  end
end

Instance Method Details

#render_seq(viterbi_stack) ⇒ Object 



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# File 'lib/ipxact_tools/interrupt_line_detector.rb', line 74

def render_seq(viterbi_stack)
  seq = []
  stack_el = viterbi_stack.pop
  while stack_el
    el = stack_el.max{|a, b| a[1][:prob] <=> b[1][:prob]}
    seq << el[0]
    stack_el = viterbi_stack.pop
  end
  seq.reverse
end

#symbol_probability(symbol, state) ⇒ Object 



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# File 'lib/ipxact_tools/interrupt_line_detector.rb', line 28

def symbol_probability(symbol, state)
  port = symbol

  bus_name_p = @@detector_stats[:bus_name_regex].collect {|el| port[:name] =~ el[0] ? el[1] : 0.1}.max
  bus_library_name_p = @@detector_stats[:bus_library_regex].collect {|el| port[:bus_id].name =~ el[0] ? el[1] : 0.1}.max

  res = nil
  if state == :int
    (bus_name_p * bus_library_name_p) / (bus_name_p * bus_library_name_p + (1.0 - bus_name_p) * (1.0 - bus_library_name_p))
  else
    ((1.0 - bus_name_p) * (1.0 - bus_library_name_p)) / (bus_name_p * bus_library_name_p + (1.0 - bus_name_p) * (1.0 - bus_library_name_p))
  end
end

#viterbi(symbol_queue) ⇒ Object 



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# File 'lib/ipxact_tools/interrupt_line_detector.rb', line 42

def viterbi(symbol_queue)
  return [] if symbol_queue.empty?

  current_symbol = symbol_queue.shift

  initial_values = @@detector_stats[:states].inject({}) do |acc, state|
    acc[state] = {
      :prob => @@detector_stats[:initial_state][state] * symbol_probability(current_symbol, state),
      :previous => nil
    }
    acc
  end

  stat_stack = [initial_values]

  @previous = initial_values

  stat_stack += symbol_queue.collect do |symbol|
    new_states = {}
    previous_max = @previous.max {|a, b| a[1][:prob] <=> b[1][:prob]}
    @@detector_stats[:states].inject({}) do |acc, state|
      stats = @@detector_stats[:states].collect{|o_state| {:prob => previous_max[1][:prob] * @@detector_stats[:transition_matrix][o_state][state] * symbol_probability(symbol, state), :previous => previous_max[0]}}
      acc[state] = stats.max{|a, b| a[:prob] <=> b[:prob]}
      new_states[state] = acc[state]
      acc
    end
    @previous = new_states
  end

  stat_stack
end