code: def construct(self):
      mem = Rectangle(height=0.5, width=0.5)
      fill = Rectangle(height=0.46, width=0.46).set_stroke(width=0)
      meta_mem = Rectangle(height=0.25, width=0.25)
  
      cpu_left_col_base = [mem.copy() for i in range(6)]
      cpu_right_col_base = [mem.copy() for i in range(6)]
      cpu_left_col = VGroup(*cpu_left_col_base).arrange(UP, buff=0)
      cpu_right_col = VGroup(*cpu_right_col_base).arrange(UP, buff=0)
      cpu_rects = VGroup(cpu_left_col, cpu_right_col).arrange(
          RIGHT, buff=0
      )
      cpu_text = Text("CPU", font_size=24)
      cpu = Group(cpu_rects, cpu_text).arrange(
          DOWN, buff=0.5, aligned_edge=DOWN
      )
      cpu.move_to([-2.5, -0.5, 0])
      self.add(cpu)
  
      gpu_base = [mem.copy() for i in range(4)]
      gpu_rect = VGroup(*gpu_base).arrange(UP, buff=0)
      gpu_text = Text("GPU", font_size=24)
      gpu = Group(gpu_rect, gpu_text).arrange(
          DOWN, buff=0.5, aligned_edge=DOWN
      )
      gpu.move_to([-1, -1, 0])
      self.add(gpu)
  
      model_base = [mem.copy() for i in range(6)]
      model_rect = VGroup(*model_base).arrange(RIGHT, buff=0)
  
      model_text = Text("Model", font_size=24)
      model = Group(model_rect, model_text).arrange(
          DOWN, buff=0.5, aligned_edge=DOWN
      )
      model.move_to([3, -1.0, 0])
      self.add(model)
  
      model_cpu_arr = []
      model_meta_arr = []
  
      for i, rect in enumerate(model_base):
          rect.set_stroke(YELLOW)
  
          cpu_target = (
              Rectangle(height=0.46 / 4, width=0.46 / 3)
              .set_stroke(width=0.0)
              .set_fill(YELLOW, opacity=0.7)
          )
  
          if i == 0:
              cpu_target.next_to(
                  cpu_left_col_base[0].get_corner(DOWN + LEFT),
                  buff=0.02,
                  direction=UP,
              )
              cpu_target.set_x(cpu_target.get_x() + 0.1)
          elif i == 3:
              cpu_target.next_to(
                  model_cpu_arr[0], direction=UP, buff=0.0
              )
          else:
              cpu_target.next_to(
                  model_cpu_arr[i - 1], direction=RIGHT, buff=0.0
              )
          self.add(cpu_target)
          model_cpu_arr.append(cpu_target)
  
      self.add(*model_cpu_arr, *model_meta_arr)
  
      disk_left_col_base = [meta_mem.copy() for i in range(6)]
      disk_right_col_base = [meta_mem.copy() for i in range(6)]
      disk_left_col = VGroup(*disk_left_col_base).arrange(UP, buff=0)
      disk_right_col = VGroup(*disk_right_col_base).arrange(UP, buff=0)
      disk_rects = VGroup(disk_left_col, disk_right_col).arrange(
          RIGHT, buff=0
      )
      disk_text = Text("Disk", font_size=24)
      disk = Group(disk_rects, disk_text).arrange(
          DOWN, buff=0.5, aligned_edge=DOWN
      )
      disk.move_to([-4.0, -1.25, 0])
      self.add(disk_text, disk_rects)
  
      cpu_disk_arr = []
  
      for i in range(6):
          target = fill.copy().set_fill(BLUE, opacity=0.8)
          target.move_to(disk_left_col_base[i]).scale(0.5)
          cpu_disk_arr.append(target)
  
      self.add(*cpu_disk_arr)
  
      key = Square(side_length=2.2)
      key.move_to([-5, 2, 0])
  
      key_text = MarkupText(
          f"<b>Key:</b>\n\n<span fgcolor='{YELLOW}'>●</span> Empty Model",
          font_size=18,
      )
  
      key_text.move_to([-5, 2.4, 0])
  
      self.add(key_text, key)
  
      blue_text = MarkupText(
          f"<span fgcolor='{BLUE}'>●</span> Checkpoint",
          font_size=18,
      )
  
      blue_text.next_to(
          key_text, DOWN * 2.4, aligned_edge=key_text.get_left()
      )
      self.add(blue_text)
  
      step_5 = MarkupText(
          f"The offloaded weights are all sent to the CPU.",
          font_size=24,
      )
      step_5.move_to([2, 2, 0])
  
      self.play(Write(step_5, run_time=3))
  
      for i in range(6):
          rect = cpu_disk_arr[i]
          cp2 = rect.copy().set_fill(BLUE, opacity=0.8).scale(2.0)
          cp2.generate_target()
          cp2.target.move_to(model_base[i])
  
          if i == 0:
              rect.set_fill(BLUE, opacity=0.8)
              rect.generate_target()
              rect.target.move_to(cpu_left_col_base[0]).scale(2.0)
  
              self.remove(
                  *model_meta_arr,
                  *model_cpu_arr,
              )
  
          else:
              rect.generate_target()
              rect.target.move_to(cpu_left_col_base[i]).scale(2.0)
          self.play(
              MoveToTarget(rect),
              MoveToTarget(cp2),
              model_base[i].animate.set_stroke(WHITE),
          )
      self.play(FadeOut(step_5))
  
      step_5 = MarkupText(
          f"Finally, hooks are added to each weight in the model\nto transfer the weights from CPU to GPU\n\t\tand back when needed.",
          font_size=24,
      )
      step_5.move_to([2, 2, 0])
  
      self.play(Write(step_5, run_time=3))
  
      arrows = []
      animations = []
      for i in range(6):
          a = Arrow(start=UP, end=DOWN, color=RED, buff=0.5)
          a.next_to(model_base[i].get_left(), UP, buff=0.2)
          arrows.append(a)
          animations.append(Write(a))
      self.play(*animations)
      self.wait()
  
imports: from manim import *
label_desc: Use image node_id 1 for calling the Stage4 obj's underlying member method code with example usage: obj.construct() without return types