def duration_changes(individual: Individual):
notes = individual.get_flattened_notes()
durations = list(map(lambda x: x.duration.duration_value, notes))
counter = 0
for i in range(1, len(durations)):
d_1 = durations[i - 1]
d_2 = durations[i]
if d_1 / d_2 >= 4.0:
counter += 1
return - (counter / (len(notes) - 1))
def duration_patterns(individual: Individual):
notes = individual.get_flattened_notes()
durations = list(map(lambda x: x.duration.duration_name, notes))
pattern_counter = find_patterns(durations)
fitness = 0.0
for k, v in pattern_counter.items():
divider = len(notes) - k + 1
fitness += v / divider
if fitness == 0.0:
return 0.0
return fitness / len(pattern_counter.items())
def intervallic_patterns(individual: Individual):
notes: [Note] = individual.get_flattened_notes()
notes = list(filter(lambda x: x.pitch != 'REST', notes))
intervals = []
for i in range(1, len(notes)):
n1 = notes[i - 1].to_music21_note()
n2 = notes[i].to_music21_note()
n1_scalestep = get_scale_position(n1.nameWithOctave)
n2_scalestep = get_scale_position(n2.nameWithOctave)
scalestep_interval = n2_scalestep - n1_scalestep
intervals.append(scalestep_interval)
pattern_length_counter = find_patterns(intervals)
fitness = 0.0
for k, v in pattern_length_counter.items():
# Maximum number of k length patterns in piece
divider = len(notes) - k + 1
fitness += v / divider
if fitness == 0.0:
return 0.0
return fitness / len(pattern_length_counter.items())