code: def get_diffuse_value(self, points, view_dirs, diffuse_normals):
      diffuse_shading = self.diffuse_network(diffuse_normals)
      return diffuse_shading.expand([-1, 3])
  
imports: import torch
  import torch.nn
  import numpy
  import trimesh
  import os
  from utils import rend_util
  from model.embedder import *
  from model.ray_tracing import RayTracing
  from model.sample_network import SampleNetwork
label_desc: Use image node_id 4 for calling the IFNetwork obj's underlying member method code with example usage: obj.get_diffuse_value(points, view_dirs, diffuse_normals) and returns: diffuse_shading