code: def get_channel_numbers(dataset: "DigitDataset"):
      channel_numbers = {
          DigitDataset.MNIST: 1,
          DigitDataset.MNIST_RGB: 3,
          DigitDataset.MNISTM: 3,
          DigitDataset.USPS: 1,
          DigitDataset.USPS_RGB: 3,
          DigitDataset.SVHN: 3,
      }
      return channel_numbers[dataset]
  
imports: import glob
  import logging
  import os
  from enum import Enum
  import numpy
  import pydicom
  import torch
  from torchvision import datasets, transforms
  from kale.loaddata.dataset_access import DatasetAccess
  from kale.loaddata.mnistm import MNISTM
  from kale.loaddata.multi_domain import MultiDomainAccess, MultiDomainImageFolder
  from kale.loaddata.usps import USPS
  from kale.prepdata.image_transform import get_transform
  from kale.utils.download import download_file_by_url
label_desc: Use image node_id 1 for calling the DigitDataset obj's underlying member method code with example usage: obj.get_channel_numbers(dataset) and returns: channel_numbers