[vibrato]

There is no evidence that unconcious bias can be effectively mitigated by "training".

[bhuga]

Training to pre-select criteria before viewing candidates is well supported as a mitigation by literature such as: https://ed.stanford.edu/sites/default/files/uhlmann_et_2005....

From the abstract: Commitment to hiring criteria prior to disclosure of the applicant’s gender eliminated discrimination

I'm sure there are many sitautions where training is less effective, but the hiring example is well supported.