code: def __init__(
      self,
      bound,
      grid_resolution,
      grid_levels,
      render_step_size=1e-3,
      near_plane=0.2,
      cone_angle=0.004,
      alpha_thre=1e-2,
  ):
      super().__init__(bound)
  
      self.grid_resolution = grid_resolution
      self.grid_levels = grid_levels
      self.render_step_size = render_step_size
      self.near_plane = near_plane
      self.cone_angle = cone_angle
      self.alpha_thre = alpha_thre
      self.nerf = None
  
      self.estimator = OccGridEstimator(
          roi_aabb=self.aabb,
          resolution=self.grid_resolution,
          levels=self.grid_levels,
      )
  
file_path: NeMo/nemo/collections/multimodal/modules/nerf/renderers/nerfacc_volume_renderer.py
imports: import collections
  from typing import Optional
  import torch
  from nerfacc.estimators.occ_grid import OccGridEstimator
  from nerfacc.grid import ray_aabb_intersect, traverse_grids
  from nerfacc.volrend import accumulate_along_rays_, render_weight_from_density, rendering
  from nemo.collections.multimodal.modules.renderer.base_renderer import BaseRenderer
label_desc: Use image node_id 1 to create a new NerfaccVolumeBaseRenderer object from inherited base classes: BaseRenderer with example: obj = NerfaccVolumeBaseRenderer(bound, grid_resolution, grid_levels, render_step_size, near_plane, cone_angle, alpha_thre)