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Sensor.py
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Sensor.py
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import matplotlib
# matplotlib.use('Agg')
from pandas import DataFrame
from pandas import Series
from pandas import concat
from pandas import read_csv
from pandas import datetime
import pandas as pd
from sklearn.metrics import mean_squared_error
from sklearn.preprocessing import MinMaxScaler
from keras.models import Sequential,load_model
from keras.layers import Dense
from keras.layers import LSTM
from math import sqrt
from matplotlib import pyplot
from numpy import array
import datetime
from matplotlib.dates import DateFormatter
from random import shuffle
import numpy as np
from scipy import stats
import os
import pickle
class Sensors:
units = {'MAIN_FILTER_IN_PRESSURE':'PSI','MAIN_FILTER_OIL_TEMP':'Celsius',
'MAIN_FILTER_OUT_PRESSURE':'PSI','OIL_RETURN_TEMPERATURE':'Celsius',
'TANK_FILTER_IN_PRESSURE':'PSI','TANK_FILTER_OUT_PRESSURE':'PSI',
'TANK_LEVEL':'Centimeter','TANK_TEMPERATURE':'Celsius','FT-202B':'Micrometer',
'FT-204B':'Micrometer','PT-203':'Micrometer','PT-204':'Micrometer'}
sensor_name_acronym = {'MAIN_FILTER_IN_PRESSURE':'P1','MAIN_FILTER_OIL_TEMP':'T1',
'MAIN_FILTER_OUT_PRESSURE':'PSI','OIL_RETURN_TEMPERATURE':'T2',
'TANK_FILTER_IN_PRESSURE':'PSI','TANK_FILTER_OUT_PRESSURE':'PSI',
'TANK_LEVEL':'L1','TANK_TEMPERATURE':'T3','FT-202B':'V1',
'FT-204B':'V2','PT-203':'V3','PT-204':'V4'}
threshold = {'MAIN_FILTER_IN_PRESSURE': (40, 65, 80), 'MAIN_FILTER_OIL_TEMP': (40, 55, 60),
'MAIN_FILTER_OUT_PRESSURE': 'PSI', 'OIL_RETURN_TEMPERATURE': (40, 55, 60),
'TANK_FILTER_IN_PRESSURE': 'PSI', 'TANK_FILTER_OUT_PRESSURE': 'PSI',
'TANK_LEVEL': (40, 48, 50), 'TANK_TEMPERATURE': (40, 55, 60), 'FT-202B': (0, 20, 50),
'FT-204B': (0, 10, 20), 'PT-203': (0, 20, 50), 'PT-204': (0, 10, 20)}
def __init__(self, dataset_path, sensor_name,sample_rate, root_path, n_epochs = 1, n_batch = 1,
save_info = 0, n_neurons = 1, run_on_local = 1, train = 1, n_lag = 1, n_seq = 1):
self.n_lag = n_lag
self.n_seq = n_seq
self.n_epochs = n_epochs
self.n_batch = n_batch
self.n_neurons = n_neurons
self.dataset_path = dataset_path
self.sensor_name = sensor_name
self.sample_rate = sample_rate
self.root_path = root_path
self.save_info = save_info
self.run_on_local = run_on_local
self.train = train
self.init_file_name()
# self.normality_test()
def get_units(self):
return self.units
def init_file_name(self):
# self.dataset_path = self.dataset_path + self.sample_rate + '/' + self.sensor_name + '.csv'
self.dataset_path = os.path.join(self.dataset_path, self.sample_rate, self.sensor_name + '.csv')
self.file_name = self.sensor_name + '-' + self.sample_rate
self.file_path = os.path.join(self.root_path, self.sensor_name, self.sample_rate, str(self.n_seq) + '_step')
def get_files(self, file_dir):
'''
Args:
file_dir: file directory
Returns:
list of file path
'''
dataset_path = []
for root, dirs, files in os.walk(file_dir):
for file in files:
dataset_path.append(os.path.join(root, file))
return dataset_path
# date-time parsing function for loading the dataset
def parser(self, x):
return datetime.strptime('190' + x, '%Y-%m')
# convert time series into supervised learning problem
def series_to_supervised(self, data, n_in=1, n_out=1, dropnan=True):
n_vars = 1 if type(data) is list else data.shape[1]
df = DataFrame(data)
cols, names = list(), list()
# input sequence (t-n, ... t-1)
for i in range(n_in, 0, -1):
cols.append(df.shift(i))
names += [('var%d(t-%d)' % (j + 1, i)) for j in range(n_vars)]
# forecast sequence (t, t+1, ... t+n)
for i in range(0, n_out):
cols.append(df.shift(-i))
if i == 0:
names += [('var%d(t)' % (j + 1)) for j in range(n_vars)]
else:
names += [('var%d(t+%d)' % (j + 1, i)) for j in range(n_vars)]
# put it all together
agg = concat(cols, axis=1)
agg.columns = names
# drop rows with NaN values
if dropnan:
agg.dropna(inplace=True)
return agg
# create a differenced series
def difference(self, dataset, interval=1):
diff = list()
for i in range(interval, len(dataset)):
value = dataset[i] - dataset[i - interval]
diff.append(value)
return Series(diff)
# transform series into train and test sets for supervised learning
def prepare_data(self, series, n_test, n_lag, n_seq):
# extract raw values
raw_values = series.values
# transform data to be stationary
diff_series = self.difference(raw_values, 1)
diff_values = diff_series.values
diff_values = diff_values.reshape(len(diff_values), 1)
# rescale values to -1, 1
scaler = MinMaxScaler(feature_range=(-1, 1))
scaled_values = scaler.fit_transform(diff_values)
scaled_values = scaled_values.reshape(len(scaled_values), 1)
# transform into supervised learning problem X, y
supervised = self.series_to_supervised(scaled_values, n_lag, n_seq)
supervised_values = supervised.values
# split into train and test sets
train, test = supervised_values[0:-n_test], supervised_values[-n_test:]
return scaler, train, test
# fit an LSTM network to training data
def fit_lstm(self, train, n_lag, n_seq, n_batch, nb_epoch, n_neurons):
# reshape training into [samples, timesteps, features]
X, y = train[:, 0:n_lag], train[:, n_lag:]
X = X.reshape(X.shape[0], 1, X.shape[1])
# design network
model = Sequential()
model.add(LSTM(n_neurons, batch_input_shape=(n_batch, X.shape[1], X.shape[2]), stateful=True))
model.add(Dense(y.shape[1]))
model.compile(loss='mean_squared_error', optimizer='adam')
# fit network
for i in range(nb_epoch):
model.fit(X, y, epochs=1, batch_size=n_batch, verbose=0, shuffle=False)
model.reset_states()
return model
# make one forecast with an LSTM,
def forecast_lstm(self, model, X, n_batch):
# reshape input pattern to [samples, timesteps, features]
X = X.reshape(1, 1, len(X))
# make forecast
forecast = model.predict(X, batch_size=n_batch)
# convert to array
return [x for x in forecast[0, :]]
# evaluate the persistence model
def make_forecasts(self, model, n_batch, test, n_lag, n_seq):
forecasts = list()
for i in range(len(test)):
X, y = test[i, 0:n_lag], test[i, n_lag:]
# make forecast
forecast = self.forecast_lstm(model, X, n_batch)
# store the forecast
forecasts.append(forecast)
return forecasts
# invert differenced forecast
def inverse_difference(self, last_ob, forecast):
# invert first forecast
inverted = list()
inverted.append(forecast[0] + last_ob)
# propagate difference forecast using inverted first value
for i in range(1, len(forecast)):
inverted.append(forecast[i] + inverted[i - 1])
return inverted
# inverse data transform on forecasts
def inverse_transform(self, series, forecasts, scaler, n_test):
inverted = list()
for i in range(len(forecasts)):
# create array from forecast
forecast = array(forecasts[i])
forecast = forecast.reshape(1, len(forecast))
# invert scaling
inv_scale = scaler.inverse_transform(forecast)
inv_scale = inv_scale[0, :]
# invert differencing
index = len(series) - n_test + i - 1
last_ob = series.values[index]
inv_diff = self.inverse_difference(last_ob, inv_scale)
# store
inverted.append(inv_diff)
return inverted
# evaluate the RMSE for each forecast time step
def evaluate_forecasts(self, test, forecasts, n_lag, n_seq, sensor_name):
for i in range(n_seq):
actual = [row[i] for row in test]
predicted = [forecast[i] for forecast in forecasts]
rmse = sqrt(mean_squared_error(actual, predicted))
rmse_percent = rmse / np.mean(actual)
if self.save_info & self.train:
# save data to pickle
pickle.dump(actual, self.pkl)
pickle.dump(predicted, self.pkl)
print('t+%d RMSE: %f, error percent: %f%%' % ((i + 1), rmse, rmse_percent * 100))
if self.save_info & self.train:
self.logs.write('t+%d RMSE: %f, error percent: %f%%\n' % ((i + 1), rmse, rmse_percent * 100))
# plot the forecasts in the context of the original dataset
def plot_forecasts(self, series, forecasts, n_test, file_name, sensor_name, time, n_seq):
plot_one_line = 1
label_fontsize = 35
axis_fontsize = 30
linewidth = 5
# plot the entire dataset in blue
fig = pyplot.figure()
ax1 = fig.add_subplot(1, 1, 1)
# make x label in a specific format
ax1.xaxis_date()
ax1.xaxis.set_major_formatter(DateFormatter('%m-%d'))
forecasts = np.array(forecasts)
pyplot.plot(time, series.values, label='Actual data', linewidth=linewidth)
####################### plot the forecast value #########################
X = []
for i in range(1, forecasts.shape[1] + 1):
off_s = len(series) - n_test + i - n_seq
off_e = off_s + n_test - 1
X.append(range(off_s, off_e + 1))
X = np.array(X)
Y = np.array(forecasts)
for i in range(0, Y.shape[1]):
index = X[i]
pyplot.plot(time[index[0]:index[len(index) - 1] + 1], Y[:, i], label='Prediction: t+' + str(i + 1), linewidth=linewidth)
if plot_one_line == 1:
break
pyplot.hlines(self.threshold[self.sensor_name][0], time[0], time[-1], colors='r', label='high', linewidth=linewidth)
pyplot.hlines(self.threshold[self.sensor_name][1], time[0], time[-1], colors='g', label='normal', linewidth=linewidth)
pyplot.hlines(self.threshold[self.sensor_name][2], time[0], time[-1], colors='r', label='low', linewidth=linewidth)
pyplot.title(self.sensor_name_acronym[self.sensor_name], fontsize=label_fontsize)
pyplot.legend(fontsize=label_fontsize, loc='upper right')
pyplot.xlabel('Date', fontsize=label_fontsize)
pyplot.ylabel(self.units[sensor_name], fontsize=label_fontsize)
pyplot.xticks(fontsize=axis_fontsize)
pyplot.yticks(fontsize=axis_fontsize)
# replace date to sequential days
######################### plot zoomed in figure ########################
fig_zoomed = pyplot.figure()
ax2 = fig_zoomed.add_subplot(1, 1, 1)
ax2.xaxis_date()
ax2.xaxis.set_major_formatter(DateFormatter('%m-%d'))
# plot original data
start = X[0][0] - 1
end = len(series)
pyplot.plot(time[start:end], series[start:end], label='Actual data', linewidth=linewidth)
for i in range(0, Y.shape[1]):
index = X[i]
pyplot.plot(time[index[0]:index[len(index) - 1] + 1], Y[:, i], label='Prediction: t+' + str(i + 1), linewidth=linewidth)
if plot_one_line == 1:
break
pyplot.title(self.sensor_name_acronym[self.sensor_name], fontsize=label_fontsize)
pyplot.legend(fontsize=label_fontsize, loc='upper right')
pyplot.xlabel('Date', fontsize=label_fontsize)
pyplot.ylabel(self.units[sensor_name], fontsize=label_fontsize)
pyplot.xticks(fontsize=axis_fontsize)
pyplot.yticks(fontsize=axis_fontsize)
# show the plot
fig.show()
fig_zoomed.show()
if self.save_info:
fig.set_size_inches(18.5, 10.5)
fig_zoomed.set_size_inches(18.5, 10.5)
fig.savefig(os.path.join(self.file_path, file_name + '.png'), bbox_inches='tight', dpi=150)
fig_zoomed.savefig(os.path.join(self.file_path, file_name + '-zoomed.png'), bbox_inches='tight', dpi=150)
pyplot.close(fig)
pyplot.close(fig_zoomed)
def _plot(self, series, forecasts, n_test, file_name, sensor_name, time, n_seq):
"""
Same as function 'plot_forecasts', replace the datetime in x-axis with days.
"""
plot_one_line = 1
label_fontsize = 35
axis_fontsize = 30
linewidth = 5
# plot the entire dataset in blue
fig = pyplot.figure()
ax1 = fig.add_subplot(1, 1, 1)
# make x label in a specific format
# ax1.xaxis_date()
# ax1.xaxis.set_major_formatter(DateFormatter('%m-%d'))
forecasts = np.array(forecasts)
pyplot.plot(series.index, series.values, label='Actual data', linewidth=linewidth)
####################### plot the forecast value #########################
X = []
for i in range(1, forecasts.shape[1] + 1):
off_s = len(series) - n_test + i - n_seq
off_e = off_s + n_test - 1
X.append(range(off_s, off_e + 1))
X = np.array(X)
Y = np.array(forecasts)
for i in range(0, Y.shape[1]):
index = X[i]
pyplot.plot(np.arange(index[0], index[-1] + 1), Y[:, i], label='Prediction: t+' + str(i + 1),
linewidth=linewidth)
if plot_one_line == 1:
break
pyplot.hlines(self.threshold[self.sensor_name][0], series.index[0], series.index[-1], colors='r',
linewidth=linewidth)
pyplot.hlines(self.threshold[self.sensor_name][1], series.index[0], series.index[-1], colors='g', label='normal',
linewidth=linewidth)
pyplot.hlines(self.threshold[self.sensor_name][2], series.index[0], series.index[-1], colors='r',
linewidth=linewidth)
pyplot.title(self.sensor_name_acronym[self.sensor_name], fontsize=label_fontsize)
pyplot.legend(fontsize=label_fontsize, loc='upper left')
pyplot.xlabel('Days', fontsize=label_fontsize)
pyplot.ylabel(self.units[sensor_name], fontsize=label_fontsize)
pyplot.xticks(fontsize=axis_fontsize)
pyplot.yticks(fontsize=axis_fontsize)
# replace date to sequential days
# show the plot
fig.show()
if self.save_info:
fig.set_size_inches(18.5, 10.5)
fig.savefig(os.path.join(self.file_path, file_name + '.png'), bbox_inches='tight', dpi=150)
pyplot.close(fig)
def load_dataset(self):
series = read_csv(self.dataset_path, sep=',')
header = list(series.columns.values)
raw_time = series[header[0]]
raw_values = series[header[1]]
raw_time = raw_time.values
raw_datetime = [datetime.datetime.strptime(
i, "%Y-%m-%d %H:%M:%S") for i in raw_time]
raw_values = raw_values.values
series_time = Series(raw_time)
series_values = Series(raw_values)
return series, series_values, raw_datetime
def open_file(self):
if not os.path.exists(self.file_path):
try:
os.makedirs(self.file_path)
except:
print('create folder error!')
try:
self.logs = open(os.path.join(self.file_path, 'logs.txt'), 'w')
self.pkl = open(os.path.join(self.file_path, 'data.pkl'),'wb')
except:
print('open file error!')
def close_file(self):
try:
self.logs.close()
self.pkl.close()
except:
print('close file error!')
def run_train(self):
# create logs files
self.open_file()
print('processing the dataset of ', self.file_name)
if self.save_info:
self.logs.write(self.file_name + '\n')
# load dataset
# series = read_csv(self.dataset_path, sep=',')
# header = list(series.columns.values)
#
# raw_time = series[header[0]]
# raw_values = series[header[1]]
#
# raw_time = raw_time.values
# raw_datetime = [datetime.datetime.strptime(
# i, "%d-%b-%Y %H:%M:%S") for i in raw_time]
# raw_values = raw_values.values
#
# series_time = Series(raw_time)
# series_values = Series(raw_values)
series, series_values, raw_datetime = self.load_dataset()
# configure
n_test = int(0.2 * series.shape[0])
# prepare data
scaler, train, test = self.prepare_data(series_values, n_test, self.n_lag, self.n_seq)
# fit model
model = self.fit_lstm(train, self.n_lag, self.n_seq, self.n_batch, self.n_epochs, self.n_neurons)
if self.save_info == 1:
# save model
model_name = 'model_' + self.file_name + '-' + 'seq_' + str(self.n_seq) + '.h5'
model.save(os.path.join(self.file_path, model_name))
# make prediction
forecasts = self.make_forecasts(model, self.n_batch, test, self.n_lag, self.n_seq)
# inverse transform forecasts and test
forecasts = self.inverse_transform(series_values, forecasts, scaler, n_test + self.n_seq - 1)
actual = [row[self.n_lag:] for row in test]
actual = self.inverse_transform(series_values, actual, scaler, n_test + self.n_seq - 1)
# evaluate forecasts
self.evaluate_forecasts(actual, forecasts, self.n_lag, self.n_seq, self.file_name)
# plot forecasts
# self.plot_forecasts(series_values, forecasts, n_test, self.file_name, self.sensor_name, raw_datetime, self.n_seq)
self._plot(series_values, forecasts, n_test, self.file_name, self.sensor_name, raw_datetime, self.n_seq)
# close file
self.close_file()
def run_update(self):
pass
def _random_shuffle(self, series):
# series['value'] = series['value'].sample(frac=1).reset_index(drop=True)
value = list(series['value'])
chunks = [value[i:i+70] for i in range(0, len(value), 70)]
shuffle(chunks)
flat_list = [item for sublist in chunks for item in sublist]
series['value'] = pd.Series(flat_list)
# series.to_csv(self.dataset_path, sep=',', encoding='utf-8', index=False)
return series, series['value']
# if the prediction values are minus, set them zero
def constrain(self, forecasts):
for i in range(0, len(forecasts)):
item = forecasts[i]
for j in range(0, len(item)):
if forecasts[i][j] < 0:
forecasts[i][j] = 0
return forecasts
def _normalize(self):
"""
Normalize the dataset to make them not original
:return:
"""
# load dataset
series, series_values, raw_datetime = self.load_dataset()
values = series_values
if self.sensor_name in ['MAIN_FILTER_OIL_TEMP', 'OIL_RETURN_TEMPERATURE', 'TANK_TEMPERATURE']:
# Convert Fahrenheit to Degree
values = (values-32)/1.8
# Normalize to 35 degree to 65 degree
range = max(values) - min(values)
a = (values - min(values)) / range
range2 = 65 - 35
a = (a * range2) + 35
elif self.sensor_name in ['FT-202B', 'FT-204B', 'PT-203', 'PT-204']:
# Convert Mils to Micrometre(um)
values = 25.4*values
# Normalize to 0-50 Micrometre
range = max(values) - min(values)
a = (values - min(values)) / range
range2 = 50 - 0
a = (a * range2) + 0
elif self.sensor_name in ['MAIN_FILTER_IN_PRESSURE']:
# Normalize to 10-45 PSI
range = max(values) - min(values)
a = (values - min(values)) / range
range2 = 45 - 10
a = (a * range2) + 10
elif self.sensor_name in ['TANK_LEVEL']:
# Convert Inch to Centimeter(CM)
values = values*2.54
# Normalize to 40-60 CM
range = max(values) - min(values)
a = (values - min(values)) / range
range2 = 60 - 40
a = (a * range2) + 40
series.iloc[:, 1] = values
print('Starting normalize ' + self.sensor_name)
# Save normalized results
series.to_csv('./dataset/csv/sampled/sample_1_day_normalized/' + self.sensor_name + '.csv', sep=',', encoding='utf-8', index=False)
print('Normalize ' + self.sensor_name + ' data done!')
def normality_test(self):
_, series_values, _ = self.load_dataset()
results = stats.shapiro(series_values)
if results[1] > 0.05:
self.normality = 1
else:
self.normality = 0
# write results to a file
# with open(os.path.join(self.root_path, 'normality.txt'), 'a') as f:
# f.write('sensor name: ' + str(self.sensor_name + '-' + self.sample_rate) + ' ,normality: ' + str(self.normality) + '\n')
# save histogram image
# fig = pyplot.figure()
# pyplot.hist(series_values)
# pyplot.title(self.file_name, fontsize=20)
# pyplot.xlabel('Value', fontsize=16)
# pyplot.ylabel('Frequency', fontsize=16)
# fig.savefig(os.path.join(self.root_path, 'distribution_test', self.file_name + '.png'), bbox_inches='tight', dpi=150)
def get_health_score(self,raw_datetime, prediction_value, n_test):
_, series_values, _ = self.load_dataset()
# calculate the distribution of the training data
window = series_values[:len(series_values)-n_test]
mu = np.mean(window)
sigma = np.std(window)
cdf = stats.norm.cdf(prediction_value, loc=mu, scale = sigma)
health_index = 1 - abs(cdf - 0.5)*2
df = pd.DataFrame({'time':np.array(raw_datetime)[-len(prediction_value):], 'prediction_value':np.squeeze(prediction_value), 'health_index':np.squeeze(health_index)})
if self.save_info:
# save health index to file
print('save health index to csv starts...')
df.to_csv(os.path.join(self.file_path, 'health_index.csv'), sep=',', encoding='utf-8',index=False)
df.to_csv(os.path.join('./health_index/health_index_pred/',self.sensor_name + '.csv'), sep=',', encoding='utf-8', index=False)
print('save health index to csv done...')
return health_index
def load_model_and_predict(self):
# load model
print('loading model ' + self.file_name + '.h5...')
model = load_model(os.path.join(self.file_path, 'model_' + self.file_name + '-' + 'seq_' + str(self.n_seq) + '.h5'))
# load dataset
series, series_values, raw_datetime = self.load_dataset()
# In order to make fake data, we need to random shuffle the values
# series, series_values = self._random_shuffle(series)
# n_test = int(0.2 * series.shape[0])
n_test = 30
scaler, train, test = self.prepare_data(series_values, n_test, self.n_lag, self.n_seq)
# make a prediction
forecasts = self.make_forecasts(model, self.n_batch, test, self.n_lag, self.n_seq)
# inverse transform forecasts and test pyplot.show()
forecasts = self.inverse_transform(series_values, forecasts, scaler, n_test + self.n_seq - 1)
# map forecasts to a health score
# self.get_health_score(raw_datetime, forecasts, n_test)
actual = [row[self.n_lag:] for row in test]
actual = self.inverse_transform(series_values, actual, scaler, n_test + self.n_seq - 1)
# evaluate forecasts
self.evaluate_forecasts(actual, forecasts, self.n_lag, self.n_seq, self.file_name)
# plot forecasts
# self.plot_forecasts(series_values, forecasts, n_test, self.file_name, self.sensor_name, raw_datetime, self.n_seq)
self._plot(series_values, forecasts, n_test, self.file_name, self.sensor_name, raw_datetime, self.n_seq)
def get_pred_health_score(self):
print('loading model ' + self.file_name + '.h5...')
model = load_model(
os.path.join(self.file_path, 'model_' + self.file_name + '-' + 'seq_' + str(self.n_seq) + '.h5'))
# load dataset
series, series_values, raw_datetime = self.load_dataset()
# In order to make fake data, we need to random shuffle the values
# series, series_values = self._random_shuffle(series)
# number of testing data, here use Novermber's data as testing
a = [raw_datetime[i].month == 11 for i in range(0, len(raw_datetime))]
n_test = len(np.where(a)[0])
scaler, train, test = self.prepare_data(series_values, n_test, self.n_lag, self.n_seq)
# make a prediction
forecasts = self.make_forecasts(model, self.n_batch, test, self.n_lag, self.n_seq)
# inverse transform forecasts and test pyplot.show()
forecasts = self.inverse_transform(series_values, forecasts, scaler, n_test + self.n_seq - 1)
forecasts = self.constrain(forecasts)
# for sensor 'FT-202B' and 'PT-203', we should use log transfer to make them looks like Gaussian
if self.sensor_name in ['FT-202B', 'PT-203', 'FT-204B','PT-204']:
# use log transform
# normal, low, high = self.operating_range
# normal = np.log(normal + 10)
# low = np.log(low + 10)
# high = np.log(high + 10)
# three_sigma = abs(normal-low) if abs(normal-low)>abs(normal-high) else abs(normal-high)
# mu = normal
# sigma = three_sigma / 3
# cdf = stats.norm.cdf(np.log(np.array(forecasts) + 10), loc=mu, scale=sigma)
# health_index_pred = 1 - abs(cdf - 0.5) * 2
# time = raw_datetime[-n_test:]
# use rayleigh distribution
# if the prediction value is less than the mean of the rayleigh distribution, set health index as 1
# otherwise the far from the mean, the less the health index is
####################
# health_index_pred = np.zeros((len(forecasts),1))
# mean, var, skew, kurt = rayleigh.stats(moments='mvsk')
# index = forecasts <= mean
# health_index_pred[index] = 1
# index = forecasts > mean
# cdf = rayleigh.cdf(forecasts)
# health_index_pred[index] = (1 - cdf[index])*2
# time = raw_datetime[-n_test:]
#####################
forecasts = np.asarray(forecasts)
health_index = np.zeros((len(forecasts), 1))
low, normal, high = self.threshold[self.sensor_name]
three_sigma = abs(normal-high)
mu = normal
sigma = three_sigma/3
index = forecasts <= normal
health_index[index] = 1
index = forecasts > normal
cdf = stats.norm.cdf(forecasts[index], loc=mu, scale=sigma)
health_index[index] = 1 - abs(cdf - 0.5) * 2
time = raw_datetime[-n_test:]
else:
low, normal, high = self.threshold[self.sensor_name]
three_sigma = abs(normal-low) if abs(normal-low)>abs(normal-high) else abs(normal-high)
mu = normal
sigma = three_sigma/3
cdf = stats.norm.cdf(forecasts, loc=mu, scale=sigma)
health_index = 1 - abs(cdf - 0.5) * 2
time = raw_datetime[-n_test:]
if self.save_info:
# save health index to file
print('save health index to csv starts...')
df = pd.DataFrame({'time':time, 'prediction_value':np.squeeze(forecasts), 'health_index':np.squeeze(health_index)}, columns=['time','prediction_value','health_index'])
df.to_csv(os.path.join(os.curdir,'health_index','health_index_pred',self.sensor_name+'.csv'), sep=',', encoding='utf-8',index = False)
print('save health index to csv done...')
def get_all_health_score(self):
"""
Calculate the health score for all data set (from May to November)
:return:
"""
# load dataset
series, series_values, raw_datetime = self.load_dataset()
if self.sensor_name in ['FT-202B', 'PT-203', 'FT-204B', 'PT-204']:
# health_index_pred = np.zeros(len(series_values))
# mean, var, skew, kurt = rayleigh.stats(moments='mvsk')
# index = series_values <= mean
# health_index_pred[index] = 1
# index = series_values > mean
# cdf = rayleigh.cdf(series_values)
# health_index_pred[index] = (1 - cdf[index]) * 2
# time = raw_datetime
health_index = np.zeros(len(series_values))
normal, low, high = self.threshold
three_sigma = abs(normal - high)
mu = normal
sigma = three_sigma / 3
index = series_values <= normal
health_index[index] = 1
index = series_values > normal
cdf = stats.norm.cdf(series_values[index], loc=mu, scale=sigma)
health_index[index] = 1 - abs(cdf - 0.5) * 2
time = raw_datetime
else:
normal, low, high = self.threshold
three_sigma = abs(normal-low) if abs(normal-low)>abs(normal-high) else abs(normal-high)
mu = normal
sigma = three_sigma/3
cdf = stats.norm.cdf(series_values, loc=mu, scale=sigma)
health_index = 1 - abs(cdf - 0.5) * 2
time = raw_datetime
if self.save_info:
# save health index to file
print('save health index to csv starts...')
df = pd.DataFrame({'time':time, 'value':np.squeeze(series_values), 'health_index':np.squeeze(health_index)}, columns=['time','value','health_index'])
df.to_csv(os.path.join(os.curdir,'health_index_all',self.sensor_name+'.csv'), sep=',', encoding='utf-8',index = False)
print('save health index to csv done...')