code: def pad_to_shape(img, shape):
      img_shape = img.shape[:-1]
      s_diff = np.array(shape) - np.array(img_shape)
      diff = [(0, s_diff[0]), (0, s_diff[1]), (0, 0)]
      return np.pad(
          img,
          diff,
          mode="constant",
          constant_values=0,
      )
  
imports: import logging
  import pathlib
  import numpy
  import openslide
  import torch
  from monai.config import KeysCollection
  from monai.data import MetaTensor
  from monai.transforms import MapTransform
  from monai.utils import PostFix, convert_to_numpy, ensure_tuple
  from PIL import Image
  from scipy.ndimage import binary_fill_holes
  from skimage.morphology import remove_small_holes, remove_small_objects
label_desc: Use image node_id 3 for calling the LoadImagePatchd obj's underlying member method code with example usage: obj.pad_to_shape(img, shape) and returns: np