code: def cli():
      """
      Basic example for the pulsar sphere renderer.
  
      Writes to `basic.png`.
      """
      LOGGER.info("Rendering on GPU...")
      torch.manual_seed(1)
      n_points = 10
      width = 1_000
      height = 1_000
      device = torch.device("cuda")
      # The PyTorch3D system is right handed; in pulsar you can choose the handedness.
      # For easy reproducibility we use a right handed coordinate system here.
      renderer = Renderer(
          width, height, n_points, right_handed_system=True
      ).to(device)
      # Generate sample data.
      vert_pos = (
          torch.rand(n_points, 3, dtype=torch.float32, device=device)
          * 10.0
      )
      vert_pos[:, 2] += 25.0
      vert_pos[:, :2] -= 5.0
      vert_col = torch.rand(
          n_points, 3, dtype=torch.float32, device=device
      )
      vert_rad = torch.rand(
          n_points, dtype=torch.float32, device=device
      )
      cam_params = torch.tensor(
          [
              0.0,
              0.0,
              0.0,  # Position 0, 0, 0 (x, y, z).
              0.0,
              math.pi,  # Because of the right handed system, the camera must look 'back'.
              0.0,  # Rotation 0, 0, 0 (in axis-angle format).
              5.0,  # Focal length in world size.
              2.0,  # Sensor size in world size.
          ],
          dtype=torch.float32,
          device=device,
      )
      # Render.
      image = renderer(
          vert_pos,
          vert_col,
          vert_rad,
          cam_params,
          1.0e-1,  # Renderer blending parameter gamma, in [1., 1e-5].
          45.0,  # Maximum depth.
      )
      LOGGER.info("Writing image to `%s`.", path.abspath("basic.png"))
      imageio.imsave(
          "basic.png",
          (image.cpu().detach() * 255.0).to(torch.uint8).numpy(),
      )
      LOGGER.info("Done.")
  
imports: import logging
  import math
  from os import path
  import imageio
  import torch
  from pytorch3d.renderer.points.pulsar import Renderer
label_desc: Use image node_id 1 for calling a global function with example usage: cli() without return types