add counterfactual code#98

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shahashka wants to merge 14 commits intoECP-CANDLE:developfrom

shahashka:cf_nt3

Commits on Sep 30, 2021

add counterfactual code
shahashka
committed

Commits on Oct 4, 2021

Commits on Oct 5, 2021

Commits on Oct 26, 2021

test_cf_accuracy fixed to work with current version of data
shahashka
committed

Commits on Oct 28, 2021

Commits on Oct 31, 2021

Commits on Feb 18, 2022