def reconstitute_activations(
        self,
        resid: torch.Tensor,
        other_arg: torch.Tensor | None,
        layer_index: LayerIndex,
        pass_type: PassType,
    ) -> torch.Tensor:
        """Must be implemented by subclasses. This function takes the residual stream as input,
        and returns the (tensor of) activations."""
        pass
Must be implemented by subclasses. This function takes the residual stream as input,
        and returns the (tensor of) activations.
neuron_explainer/activations/derived_scalars/reconstituter_class.py