code: def show_train_dataset(self, indices=None):
      if self._enabled:
          dataset = self.get_dataset("train")
          viz = Visualizer()
          viz.visualize_dataset(dataset, "all", indices=indices)
  
file_path: lightning-flash/src/flash/pointcloud/segmentation/open3d_ml/app.py
imports: import torch
  from flash.core.data.data_module import DataModule
  from flash.core.data.io.input import DataKeys
  from flash.core.utilities.imports import _TOPIC_POINTCLOUD_AVAILABLE
label_desc: Use image node_id 3 for calling the App obj's underlying member method code with example usage: obj.show_train_dataset(indices) without return types