src/transformers/models/nystromformer/modeling_nystromformer.py/NystromformerForMaskedLM/__init__
class NystromformerForMaskedLM:    def __init__(self, config):
        super().__init__(config)

        self.nystromformer = NystromformerModel(config)
        self.cls = NystromformerOnlyMLMHead(config)

        # Initialize weights and apply final processing
        self.post_init()