Lagged implementation speedup

[kasyanovse]

One line in code in lagged implementation spends more than 95% of lagged implementation evaluation time (in my case). Fixed it.

[nicl-nno]

А есть оценка насколько это ускоряет?

[kasyanovse]

Тесты на произвольных данных. исправленный код находится в функции prepare_target.

Старый вариант.

Новый вариант.

[codecov[bot]]

Codecov Report

Merging #1139 (9410f15) into master (8f1dcd7) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1139   +/-   ##
=======================================
  Coverage   78.53%   78.53%           
=======================================
  Files         131      131           
  Lines        9359     9360    +1     
=======================================
+ Hits         7350     7351    +1     
  Misses       2009     2009           

Files Changed	Coverage Δ
...lementations/data_operations/ts_transformations.py	78.42% <100.00%> (+0.05%)	:arrow_up:

[nicl-nno]

Здорово! Да наверное в тесте нет нужды, время сложно оценивать.