code: def _templates_src_dir() -> str:
      """Get template directory in the source tree.
  
        We should find tfx/experimental/templates
        from tfx/tools/cli/handler/template_handler.py.
      Returns:
        Path to the directory containing template sources.
      """
      return os.path.join(_tfx_src_dir(), "experimental", "templates")
  
file_path: tfx/tfx/tools/cli/handler/template_handler.py
imports: import collections
  import os
  import re
  from typing import Dict, Any, List, Pattern, Set
  import urllib.request
  import click
  from tfx.dsl.io import fileio
  from tfx.tools.cli import labels
label_desc: Use image node_id 2 for calling a global function with example usage: _templates_src_dir() and returns: os