class_docstr: Original implementation: https://github.com/princeton-vl/pytorch_stacked_hourglass/blob/master/models/layers.py
code: def __str__(self):
      return f"hg_s{self.stack_level}_d{self.depth_level}_f{self.num_features}"
  
imports: import inspect
  from collections import OrderedDict
  from typing import List, Callable, Tuple
  import torch
  from pytorch_toolbelt.modules import ACT_RELU, get_activation_block
  from pytorch_toolbelt.modules.encoders import EncoderModule, make_n_channel_input
  from torch import nn, Tensor
label_desc: Use image node_id 2 for calling the StackedHGEncoder obj's underlying member method code with example usage: obj.__str__() and returns: str, self, str, self, str, self