Class: Iriq::PositionEvidence

Inherits:
Struct
  • Object
show all
Defined in:
lib/iriq/position_evidence.rb

Overview

The slice of a position's stats that classifying one value reads (Corpus#classify). A backend can answer it without materializing every value tracked at the position.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#cardinality ⇒ Object

Returns the value of attribute cardinality

Returns:

  • the current value of cardinality



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# File 'lib/iriq/position_evidence.rb', line 5

def cardinality
  @cardinality
end

#total ⇒ Object

Returns the value of attribute total

Returns:

  • the current value of total



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# File 'lib/iriq/position_evidence.rb', line 5

def total
  @total
end

#type_counts ⇒ Object

Returns the value of attribute type_counts

Returns:

  • the current value of type_counts



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# File 'lib/iriq/position_evidence.rb', line 5

def type_counts
  @type_counts
end

#value_count ⇒ Object

Returns the value of attribute value_count

Returns:

  • the current value of value_count



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# File 'lib/iriq/position_evidence.rb', line 5

def value_count
  @value_count
end

Class Method Details

.from_stats(stats, value) ⇒ Object

value_count is nil when the value isn't tracked (never seen, or dropped at the cap).



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# File 'lib/iriq/position_evidence.rb', line 8

def self.from_stats(stats, value)
  new(
    total:       stats.total,
    type_counts: stats.type_counts,
    cardinality: stats.cardinality,
    value_count: stats.value_counts.fetch(value, nil),
  )
end

Instance Method Details

#value_fraction ⇒ Object

Same as PositionStats#value_fraction for the probed value.



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# File 'lib/iriq/position_evidence.rb', line 25

def value_fraction
  return 0.0 if total.zero?

  (value_count || 0).to_f / total
end

#variable_fraction(classifier) ⇒ Object

Same as PositionStats#variable_fraction.



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# File 'lib/iriq/position_evidence.rb', line 18

def variable_fraction(classifier)
  return 0.0 if total.zero?

  type_counts.sum { |t, c| classifier.variable?(t) ? c : 0 }.to_f / total
end