def groove(model_name: str, interpolate_sequence: NoteSequence,
num_steps_per_sample: int, num_output: int,
total_bars: int) -> NoteSequence:
"""
Adds groove to the given sequence by splitting it in manageable sequences
and using the given model to humanize it.
"""
model = get_model(model_name)
# Split the sequences in chunks of 4 seconds (which is 2 bars at 120 qpm),
# which is necessary since the model is trained for 2 bars
split_interpolate_sequences = mm.sequences_lib.split_note_sequence(
interpolate_sequence, 4)
if len(split_interpolate_sequences) != num_output:
raise Exception(f"Wrong number of interpolate size, "
f"expected: 10, actual: {split_interpolate_sequences}")
# Uses the model to encode the list of sequences, returning the encoding
# (also called z or latent vector) which will the used in the decoding,
# The other values mu and sigma are not used, but kept in the code for
# clarity.
#
# The resulting array shape is (a, b), where a is the number of
# split sequences (should correspond to num_output), and b is the encoding
# size.
#
# This might throw a NoExtractedExamplesError exception if the
# sequences are not properly formed (for example if the sequences
# are not quantized, a sequence is empty or not of the proper length).
encoding, mu, sigma = model.encode(
note_sequences=split_interpolate_sequences)
# Uses the model to decode the encoding (also called z or latent vector),
# returning a list of humanized sequence with one element per encoded
# sequences (each of length num_steps_per_sample).
groove_sequences = model.decode(z=encoding, length=num_steps_per_sample)
# Concatenates the resulting sequences (of length num_output) into one
# single sequence.
groove_sequence = mm.sequences_lib.concatenate_sequences(
groove_sequences, [4] * num_output)
# Saves the midi and the plot in the groove folder,
# with the plot having total_bars size
save_midi(groove_sequence, "groove", model_name)
save_plot(groove_sequence,
"groove",
model_name,
plot_max_length_bar=total_bars,
show_velocity=True,
bar_fill_alphas=[0.50, 0.50, 0.05, 0.05])
return groove_sequence
def interpolate(model_name: str, sample_sequences: List[NoteSequence],
num_steps_per_sample: int, num_output: int,
total_bars: int) -> NoteSequence:
"""
Interpolates between 2 sequences using the given model.
"""
if len(sample_sequences) != 2:
raise Exception(f"Wrong number of sequences, "
f"expected: 2, actual: {len(sample_sequences)}")
if not sample_sequences[0].notes or not sample_sequences[1].notes:
raise Exception(
f"Empty note sequences, "
f"sequence 1 length: {len(sample_sequences[0].notes)}, "
f"sequence 2 length: {len(sample_sequences[1].notes)}")
model = get_model(model_name)
# Use the model to interpolate between the 2 input sequences,
# with the number of output (counting the start and end sequence),
# number of steps per sample and default temperature
#
# This might throw a NoExtractedExamplesError exception if the
# sequences are not properly formed (for example if the sequences
# are not quantized, a sequence is empty or not of the proper length).
interpolate_sequences = model.interpolate(
start_sequence=sample_sequences[0],
end_sequence=sample_sequences[1],
num_steps=num_output,
length=num_steps_per_sample)
# Saves the midi and the plot in the interpolate folder
save_midi(interpolate_sequences, "interpolate", model_name)
save_plot(interpolate_sequences, "interpolate", model_name)
# Concatenates the resulting sequences (of length num_output) into one
# single sequence.
# The second parameter is a list containing the number of seconds
# for each input sequence. This is useful if some of the input
# sequences do not have notes at the end (for example the last
# note ends at 3.5 seconds instead of 4)
interpolate_sequence = mm.sequences_lib.concatenate_sequences(
interpolate_sequences, [4] * num_output)
# Saves the midi and the plot in the merge folder,
# with the plot having total_bars size
save_midi(interpolate_sequence, "merge", model_name)
save_plot(interpolate_sequence,
"merge",
model_name,
plot_max_length_bar=total_bars,
bar_fill_alphas=[0.50, 0.50, 0.05, 0.05])
return interpolate_sequence
def sample(model_name: str, num_steps_per_sample: int) -> List[NoteSequence]:
"""
Samples 2 sequences using the given model.
"""
model = get_model(model_name)
# Uses the model to sample 2 sequences,
# with the number of steps and default temperature
sample_sequences = model.sample(n=2, length=num_steps_per_sample)
# Saves the midi and the plot in the sample folder
save_midi(sample_sequences, "sample", model_name)
save_plot(sample_sequences, "sample", model_name)
return sample_sequences