code: def build_anchor_generator(opts, *args, **kwargs):
      """Build anchor generator for object detection"""
      anchor_gen_name = getattr(opts, "anchor_generator.name")
  
      # We registered the base class using a special `name` (i.e., `__base__`)
      # in order to access the arguments defined inside those classes. However, these classes are not supposed to
      # be used. Therefore, we raise an error for such cases
      if anchor_gen_name == "__base__":
          logger.error(
              "__base__ can't be used as a projection name. Please check."
          )
  
      anchor_gen = ANCHOR_GEN_REGISTRY[anchor_gen_name](
          opts, *args, **kwargs
      )
      return anchor_gen
  
imports: import argparse
  from cvnets.anchor_generator.base_anchor_generator import BaseAnchorGenerator
  from utils import logger
  from utils.registry import Registry
label_desc: Use image node_id 2 for calling a global function with example usage: build_anchor_generator(opts) and returns: anchor_gen