FIX / Quantizaiton: Revert back previous replacement logic #30779
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What does this PR do?
Fixes: huggingface/peft#1720
#29958 introduced a new logic for linear layer replacement for bnb which led to a corner case.
Before that PR, for a BertForSequenceClassification model:
Gives:
But after #29958 :
The pre_classifier gets also quantized. In order to preserve BC (even though it might not be 100% what is intended) I propose to add that extra condition and make sure previous behaviour is maintained
cc @SunMarc @BenjaminBossan