Thinkings:

1. Anomalous patterns may represent anomalous events. what does an anomalous pattern mean in energy consumption?W
   1. measurement/manual operation errors, instrument failure, XX human activities. 比如窃电行为，偷入住行为。
what is the necessity of extracting anomalous knowledge?
1. they affect the models related to forecasting and analysis. 
2. The anomaly may be related to XX events. -----> early warning and prevention of XX disasters, and to reduce economic and social losses. 
2. What algorithms are used in energy domains? What algorithms are used in other fields? Can they be used in energy fields? if not, why?
   1. other domains:
      1. SAX, convert TS into symbolic TS; then top-k pattern anomalies are analyzed and verified from the candidate pattern anomalies.
      2. formalize normal patterns, define a temporal similarity score between sequences. and then detect abnormal patterns which do not match or deviate from normal patterns.