how to find the path speechbrain.utils.parameter_transfer.Pretrainer on Github?

I find that speaker_verification_plda.py download pretrained model from this path defined in the speaker_verification_plda.yaml file.
pretrainer: !new:speechbrain.utils.parameter_transfer.Pretrainer.
But I can not find this function Pretrainer in the path, so I want to know where it is.
Thank you much!

Hi, it is in speechbrain.utils.parameter_transfer.Pretrainer :slightly_smiling_face: