code: def __init__(self, eps=0.2):
      super(PartSegLoss, self).__init__()
      self.eps = eps
      self.loss = nn.CrossEntropyLoss()
  
file_path: dgl/examples/pytorch/pointcloud/pointnet/pointnet_partseg.py
imports: import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  from torch.autograd import Variable
label_desc: Use image node_id 1 to create a new PartSegLoss object from inherited base classes: nn with example: obj = PartSegLoss(eps)