class_docstr: ImageFeature is used to visualize image features in Insights. It expects an image in
  NCHW format. If C has a dimension of 1, its assumed to be a greyscale image.
  If it has a dimension of 3, its expected to be in RGB format.
class_docstr_tok: ["ImageFeature","is","used","to","visualize","image","features","in","Insights",".","It","expects","an","image","in","NCHW","format",".","If","C","has","a","dimension","of","1",",","its","assumed","to","be","a","greyscale","image",".","If","it","has","a","dimension","of","3",",","its","expected","to","be","in","RGB","format","."]
code: def visualization_type() -> str:
      return "image"
  
imports: import base64
  import warnings
  from collections import namedtuple
  from io import BytesIO
  from typing import Callable, List, Optional, Union
  from captum._utils.common import safe_div
  from captum.attr._utils import visualization
  from captum.insights.attr_vis._utils.transforms import format_transforms
label_desc: Use image node_id 2 for calling the ImageFeature obj's underlying member method code with example usage: obj.visualization_type() and returns: str