selected_predictor_cols)
# and (not (c == 'hr_Heart Rate'))
# Plot the variance explained.
plot.plot(range(1, len(selected_predictor_cols) + 1), pc_values, 'b-')
plot.xlabel('principal component number')
plot.ylabel('explained variance')
plot.show(block=False)
# We select 7 as the best number of PC's as this explains most of the variance
n_pcs = 7
dataset = PCA.apply_pca(copy.deepcopy(dataset), selected_predictor_cols, n_pcs)
#And we visualize the result of the PC's
DataViz.plot_dataset(dataset, ['pca_', 'label'], ['like', 'like'],
['line', 'points'])
# And the overall final dataset:
# DataViz.plot_dataset(dataset, ['acc_', 'gyr_', 'hr_watch_rate', 'light_phone_lux', 'mag_', 'press_phone_', 'pca_', 'label'], ['like', 'like', 'like', 'like', 'like', 'like', 'like','like', 'like'], ['line', 'line', 'line', 'line', 'line', 'line', 'line', 'points', 'points'])
DataViz.plot_dataset(dataset, [
'acc_', 'press_', 'gyr_', 'mag_', 'linacc_', 'hr_', 'pca_', 'label'
], ['like', 'like', 'like', 'like', 'like', 'like', 'like', 'like', 'like'], [
'line', 'line', 'line', 'line', 'line', 'line', 'line', 'points', 'points'
])
def main():
# Import the data from the specified location and parse the date index
try:
dataset = pd.read_csv(Path(DATA_PATH / DATASET_FNAME), index_col=0)
dataset.index = pd.to_datetime(dataset.index)
except IOError as e:
print(
'File not found, try to run previous crowdsignals scripts first!')
raise e
# Create an instance of our visualization class to plot the results
DataViz = VisualizeDataset(__file__)
# Compute the number of milliseconds covered by an instance based on the first two rows
milliseconds_per_instance = (dataset.index[1] -
dataset.index[0]).microseconds / 1000
# Create objects for value imputation, low pass filter and PCA
MisVal = ImputationMissingValues()
LowPass = LowPassFilter()
PCA = PrincipalComponentAnalysis()
if FLAGS.mode == 'imputation':
# Impute the missing values and plot an example
imputed_mean_dataset = MisVal.impute_mean(
dataset=copy.deepcopy(dataset), col='hr_watch_rate')
imputed_median_dataset = MisVal.impute_median(
dataset=copy.deepcopy(dataset), col='hr_watch_rate')
imputed_interpolation_dataset = MisVal.impute_interpolate(
dataset=copy.deepcopy(dataset), col='hr_watch_rate')
DataViz.plot_imputed_values(
dataset, ['original', 'mean', 'median', 'interpolation'],
'hr_watch_rate', imputed_mean_dataset['hr_watch_rate'],
imputed_median_dataset['hr_watch_rate'],
imputed_interpolation_dataset['hr_watch_rate'])
elif FLAGS.mode == 'kalman':
# Using the result from Chapter 2, try the Kalman filter on the light_phone_lux attribute and study the result
try:
original_dataset = pd.read_csv(DATA_PATH / ORIG_DATASET_FNAME,
index_col=0)
original_dataset.index = pd.to_datetime(original_dataset.index)
except IOError as e:
print(
'File not found, try to run previous crowdsignals scripts first!'
)
raise e
KalFilter = KalmanFilters()
kalman_dataset = KalFilter.apply_kalman_filter(
data_table=original_dataset, col='acc_phone_x')
DataViz.plot_imputed_values(kalman_dataset, ['original', 'kalman'],
'acc_phone_x',
kalman_dataset['acc_phone_x_kalman'])
DataViz.plot_dataset(data_table=kalman_dataset,
columns=['acc_phone_x', 'acc_phone_x_kalman'],
match=['exact', 'exact'],
display=['line', 'line'])
elif FLAGS.mode == 'lowpass':
# Apply a lowpass filter and reduce the importance of the data above 1.5 Hz
# Determine the sampling frequency
fs = float(1000) / milliseconds_per_instance
# Study acc_phone_x
new_dataset = LowPass.low_pass_filter(
data_table=copy.deepcopy(dataset),
col='acc_phone_x',
sampling_frequency=fs,
cutoff_frequency=FLAGS.cutoff,
order=10)
DataViz.plot_dataset(
new_dataset.iloc[int(0.4 * len(new_dataset.index)
):int(0.43 * len(new_dataset.index)), :],
['acc_phone_x', 'acc_phone_x_lowpass'], ['exact', 'exact'],
['line', 'line'])
elif FLAGS.mode == 'PCA':
# First impute again, as PCA can not deal with missing values
for col in [c for c in dataset.columns if 'label' not in c]:
dataset = MisVal.impute_interpolate(dataset, col)
# Determine the PC's for all but the target columns (the labels and the heart rate)
selected_predictor_cols = [
c for c in dataset.columns
if (not ('label' in c)) and (not (c == 'hr_watch_rate'))
]
pc_values = PCA.determine_pc_explained_variance(
data_table=dataset, cols=selected_predictor_cols)
cumulated_variance = np.cumsum(pc_values)
# Plot the explained variance and cumulated variance
comp_numbers = np.arange(1, len(pc_values) + 1)
DataViz.plot_xy(x=[comp_numbers, comp_numbers],
y=[pc_values, cumulated_variance],
xlabel='principal component number',
ylabel='explained variance',
ylim=[0, 1],
line_styles=['b-', 'r-'],
names=['Variance', 'Cumulated variance'])
# Select 7 as the best number of PC's as this explains most of the variance
n_pcs = 7
dataset = PCA.apply_pca(data_table=copy.deepcopy(dataset),
cols=selected_predictor_cols,
number_comp=n_pcs)
# Visualize the result of the PC's and the overall final dataset
DataViz.plot_dataset(dataset, ['pca_', 'label'], ['like', 'like'],
['line', 'points'])
DataViz.plot_dataset(dataset, [
'acc_', 'gyr_', 'hr_watch_rate', 'light_phone_lux', 'mag_',
'press_phone_', 'pca_', 'label'
], [
'like', 'like', 'like', 'like', 'like', 'like', 'like', 'like',
'like'
], [
'line', 'line', 'line', 'line', 'line', 'line', 'line', 'points',
'points'
])
elif FLAGS.mode == 'final':
# Carry out that operation over all columns except for the label
print('Imputing missing values.')
for col in tqdm([c for c in dataset.columns if 'label' not in c]):
dataset = MisVal.impute_interpolate(dataset=dataset, col=col)
# Include all measurements that have a form of periodicity and filter them
periodic_measurements = [
'acc_phone_x', 'acc_phone_y', 'acc_phone_z', 'acc_watch_x',
'acc_watch_y', 'acc_watch_z', 'gyr_phone_x', 'gyr_phone_y',
'gyr_phone_z', 'gyr_watch_x', 'gyr_watch_y', 'gyr_watch_z',
'mag_phone_x', 'mag_phone_y', 'mag_phone_z', 'mag_watch_x',
'mag_watch_y', 'mag_watch_z'
]
print('Applying low pass filter on peridic measurements.')
# Determine the sampling frequency.
fs = float(1000) / milliseconds_per_instance
for col in tqdm(periodic_measurements):
dataset = LowPass.low_pass_filter(data_table=dataset,
col=col,
sampling_frequency=fs,
cutoff_frequency=FLAGS.cutoff,
order=10)
dataset[col] = dataset[col + '_lowpass']
del dataset[col + '_lowpass']
# Use the optimal found parameter n_pcs = 7 to apply PCA to the final dataset
selected_predictor_cols = [
c for c in dataset.columns
if (not ('label' in c)) and (not (c == 'hr_watch_rate'))
]
n_pcs = 7
dataset = PCA.apply_pca(data_table=copy.deepcopy(dataset),
cols=selected_predictor_cols,
number_comp=n_pcs)
# Visualize the final overall dataset
DataViz.plot_dataset(dataset, [
'acc_', 'gyr_', 'hr_watch_rate', 'light_phone_lux', 'mag_',
'press_phone_', 'pca_', 'label'
], [
'like', 'like', 'like', 'like', 'like', 'like', 'like', 'like',
'like'
], [
'line', 'line', 'line', 'line', 'line', 'line', 'line', 'points',
'points'
])
# Store the final outcome
dataset.to_csv(DATA_PATH / RESULT_FNAME)