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# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License.
"""
FILE: sample_detect_change_point.py
DESCRIPTION:
This sample demonstrates how to detect entire series change points.
Prerequisites:
* The Anomaly Detector client library for Python
* A .csv file containing a time-series data set with
UTC-timestamp and numerical values pairings.
Example data is included in this repo.
USAGE:
python sample_detect_change_point.py
Set the environment variables with your own values before running the sample:
1) ANOMALY_DETECTOR_KEY - your source Form Anomaly Detector API key.
2) ANOMALY_DETECTOR_ENDPOINT - the endpoint to your source Anomaly Detector resource.
"""
import os
from azure.ai.anomalydetector import AnomalyDetectorClient
from azure.ai.anomalydetector.models import DetectRequest, TimeSeriesPoint, TimeGranularity, \
AnomalyDetectorError
from azure.core.credentials import AzureKeyCredential
import pandas as pd
class DetectChangePointsSample(object):
def detect_change_point(self):
SUBSCRIPTION_KEY = os.environ["ANOMALY_DETECTOR_KEY"]
ANOMALY_DETECTOR_ENDPOINT = os.environ["ANOMALY_DETECTOR_ENDPOINT"]
TIME_SERIES_DATA_PATH = os.path.join("./sample_data", "request-data.csv")
# Create an Anomaly Detector client
# <client>
client = AnomalyDetectorClient(AzureKeyCredential(SUBSCRIPTION_KEY), ANOMALY_DETECTOR_ENDPOINT)
# </client>
# Load in the time series data file
# <loadDataFile>
series = []
data_file = pd.read_csv(TIME_SERIES_DATA_PATH, header=None, encoding='utf-8', parse_dates=[0])
for index, row in data_file.iterrows():
series.append(TimeSeriesPoint(timestamp=row[0], value=row[1]))
# </loadDataFile>
# Create a request from the data file
# <request>
request = DetectRequest(series=series, granularity=TimeGranularity.daily)
# </request>
# detect change points throughout the entire time series
# <detectChangePoint>
print('Detecting change points in the entire time series.')
try:
response = client.detect_change_point(request)
except AnomalyDetectorError as e:
print('Error code: {}'.format(e.error.code), 'Error message: {}'.format(e.error.message))
except Exception as e:
print(e)
if any(response.is_change_point):
print('An change point was detected at index:')
for i, value in enumerate(response.is_change_point):
if value:
print(i)
else:
print('No change point were detected in the time series.')
# </detectChangePoint>
if __name__ == '__main__':
sample = DetectChangePointsSample()
sample.detect_change_point()
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