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tests_ppg.py
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tests_ppg.py
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# -*- coding: utf-8 -*-
import itertools
import numpy as np
import pytest
import neurokit2 as nk
durations = (20, 200)
sampling_rates = (50, 500)
heart_rates = (50, 120)
freq_modulations = (0.1, 0.4)
params = [durations, sampling_rates, heart_rates, freq_modulations]
params_combis = list(itertools.product(*params))
@pytest.mark.parametrize("duration, sampling_rate, heart_rate, freq_modulation", params_combis)
def test_ppg_simulate(duration, sampling_rate, heart_rate, freq_modulation):
ppg = nk.ppg_simulate(
duration=duration,
sampling_rate=sampling_rate,
heart_rate=heart_rate,
frequency_modulation=freq_modulation,
ibi_randomness=0,
drift=0,
motion_amplitude=0,
powerline_amplitude=0,
burst_amplitude=0,
burst_number=0,
random_state=42,
show=False,
)
assert ppg.size == duration * sampling_rate
signals, _ = nk.ppg_process(ppg, sampling_rate=sampling_rate)
assert np.allclose(signals["PPG_Rate"].mean(), heart_rate, atol=1)
# Ensure that the heart rate fluctuates in the requested range.
groundtruth_range = freq_modulation * heart_rate
observed_range = np.percentile(signals["PPG_Rate"], 90) - np.percentile(signals["PPG_Rate"], 10)
assert np.allclose(groundtruth_range, observed_range, atol=groundtruth_range * 0.15)
# TODO: test influence of different noise configurations
@pytest.mark.parametrize(
"ibi_randomness, std_heart_rate",
[(0.1, 3), (0.2, 5), (0.3, 8), (0.4, 11), (0.5, 14), (0.6, 19)],
)
def test_ppg_simulate_ibi(ibi_randomness, std_heart_rate):
ppg = nk.ppg_simulate(
duration=20,
sampling_rate=50,
heart_rate=70,
frequency_modulation=0,
ibi_randomness=ibi_randomness,
drift=0,
motion_amplitude=0,
powerline_amplitude=0,
burst_amplitude=0,
burst_number=0,
random_state=42,
show=False,
)
assert ppg.size == 20 * 50
signals, _ = nk.ppg_process(ppg, sampling_rate=50)
assert np.allclose(signals["PPG_Rate"].mean(), 70, atol=1.5)
# Ensure that standard deviation of heart rate
assert np.allclose(signals["PPG_Rate"].std(), std_heart_rate, atol=1)
# TODO: test influence of different noise configurations
def test_ppg_clean():
sampling_rate = 500
ppg = nk.ppg_simulate(
duration=30,
sampling_rate=sampling_rate,
heart_rate=180,
frequency_modulation=0.01,
ibi_randomness=0.1,
drift=1,
motion_amplitude=0.5,
powerline_amplitude=0.1,
burst_amplitude=1,
burst_number=5,
random_state=42,
show=False,
)
ppg_cleaned_elgendi = nk.ppg_clean(ppg, sampling_rate=sampling_rate, method="elgendi")
assert ppg.size == ppg_cleaned_elgendi.size
# Assert that bandpass filter with .5 Hz lowcut and 8 Hz highcut was applied.
fft_raw = np.abs(np.fft.rfft(ppg))
fft_elgendi = np.abs(np.fft.rfft(ppg_cleaned_elgendi))
freqs = np.fft.rfftfreq(ppg.size, 1 / sampling_rate)
assert np.sum(fft_raw[freqs < 0.5]) > np.sum(fft_elgendi[freqs < 0.5])
assert np.sum(fft_raw[freqs > 8]) > np.sum(fft_elgendi[freqs > 8])
def test_ppg_findpeaks():
sampling_rate = 500
ppg = nk.ppg_simulate(
duration=30,
sampling_rate=sampling_rate,
heart_rate=60,
frequency_modulation=0.01,
ibi_randomness=0.1,
drift=1,
motion_amplitude=0.5,
powerline_amplitude=0.1,
burst_amplitude=1,
burst_number=5,
random_state=42,
show=True,
)
ppg_cleaned_elgendi = nk.ppg_clean(ppg, sampling_rate=sampling_rate, method="elgendi")
info_elgendi = nk.ppg_findpeaks(ppg_cleaned_elgendi, sampling_rate=sampling_rate, show=True)
peaks = info_elgendi["PPG_Peaks"]
assert peaks.size == 29
assert peaks.sum() == 219764