Module: DTW::Sequence

Defined in:
lib/dtwrb/sequence.rb,
sig/dtwrb.rbs

Class Method Summary collapse

Class Method Details

.assert_uniform_dimension!(collection) ⇒ ::Integer

Parameters:

  • (::Array[frames])

Returns:

  • (::Integer) 


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# File 'lib/dtwrb/sequence.rb', line 33

def assert_uniform_dimension!(collection)
  dimension = dimension_of(collection.first)

  collection.each do |frames|
    frames.each do |frame|
      next if frame.is_a?(Array) && frame.length == dimension

      raise DimensionMismatchError, "all frames must share dimension #{dimension}, got #{frame.inspect}"
    end
  end

  dimension
end

.compact(sequences) ⇒ ::Array[sequence]

Parameters:

  • (Object)

Returns:

  • (::Array[sequence])

Raises:



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# File 'lib/dtwrb/sequence.rb', line 19

def compact(sequences)
  usable = Array(sequences).select { |sequence| usable?(sequence) }
  raise EmptyInputError, "expected at least one non-empty sequence, got none" if usable.empty?

  usable
end

.dimension_of(frames) ⇒ ::Integer

Parameters:

  • (frames)

Returns:

  • (::Integer)

Raises:



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# File 'lib/dtwrb/sequence.rb', line 26

def dimension_of(frames)
  frame = frames.first
  raise InvalidSequenceError, "expected a vector frame, got #{frame.class}" unless frame.is_a?(Array)

  frame.length
end

.scalar?(sequence) ⇒ Boolean

Parameters:

  • (Object)

Returns:

  • (Boolean) 


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# File 'lib/dtwrb/sequence.rb', line 9

def scalar?(sequence) = usable?(sequence) && sequence.first.is_a?(Numeric)

.scalarize(frames) ⇒ ::Array[::Numeric]

Parameters:

  • (frames)

Returns:

  • (::Array[::Numeric]) 


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# File 'lib/dtwrb/sequence.rb', line 17

def scalarize(frames) = frames.map(&:first)

.usable?(sequence) ⇒ Boolean

Parameters:

  • (Object)

Returns:

  • (Boolean) 


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# File 'lib/dtwrb/sequence.rb', line 7

def usable?(sequence) = sequence.is_a?(Array) && !sequence.empty?

.vectorize(sequence) ⇒ frames

Parameters:

  • (sequence)

Returns:

  • (frames)

Raises:



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# File 'lib/dtwrb/sequence.rb', line 11

def vectorize(sequence)
  raise InvalidSequenceError, "expected an Array of frames, got #{sequence.class}" unless sequence.is_a?(Array)

  scalar?(sequence) ? sequence.map { |value| [value] } : sequence
end