src/dataset/shims/normalize_shim.py

import torch
from einops import einsum, reduce, repeat
from jaxtyping import Float
from torch import Tensor

from ..types import BatchedExample


def inverse_normalize_image(tensor, mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5)):
    mean = torch.as_tensor(mean, dtype=tensor.dtype, device=tensor.device).view(-1, 1, 1)
    std = torch.as_tensor(std, dtype=tensor.dtype, device=tensor.device).view(-1, 1, 1)
    return tensor * std + mean


def normalize_image(tensor, mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5)):
    mean = torch.as_tensor(mean, dtype=tensor.dtype, device=tensor.device).view(-1, 1, 1)
    std = torch.as_tensor(std, dtype=tensor.dtype, device=tensor.device).view(-1, 1, 1)
    return (tensor - mean) / std


def apply_normalize_shim(
    batch: BatchedExample,
    mean: tuple[float, float, float] = (0.5, 0.5, 0.5),
    std: tuple[float, float, float] = (0.5, 0.5, 0.5),
) -> BatchedExample:
    batch["context"]["image"] = normalize_image(batch["context"]["image"], mean, std)
    return batch