code: def raymarcher(
      raymarcher_type=EmissionAbsorptionRaymarcher,
      n_rays=10,
      n_pts_per_ray=10,
  ):
      (
          rays_z,
          rays_densities,
          rays_features,
          depths_gt,
          features_gt,
          opacities_gt,
      ) = TestRaymarching._init_random_rays(
          n_rays=n_rays, n_pts_per_ray=n_pts_per_ray
      )
  
      raymarcher = raymarcher_type()
  
      def run_raymarcher():
          raymarcher(
              rays_densities=rays_densities,
              rays_features=rays_features,
              rays_z=rays_z,
          )
          torch.cuda.synchronize()
  
      return run_raymarcher
  
file_path: pytorch3d/tests/test_raymarching.py
imports: import unittest
  import torch
  from pytorch3d.renderer import AbsorptionOnlyRaymarcher, EmissionAbsorptionRaymarcher
  from .common_testing import TestCaseMixin
label_desc: Use image node_id 3 for calling the TestRaymarching obj's underlying member method code with example usage: obj.raymarcher(raymarcher_type, n_rays, n_pts_per_ray) and returns: run_raymarcher