code: def _report_metrics(scores_i2t, scores_t2i, txt2img, img2txt):
      # Images->Text
      ranks = np.zeros(scores_i2t.shape[0])
      for index, score in enumerate(scores_i2t):
          inds = np.argsort(score)[::-1]
          # Score
          rank = 1e20
          for i in img2txt[index]:
              tmp = np.where(inds == i)[0][0]
              if tmp < rank:
                  rank = tmp
          ranks[index] = rank
  
      # Compute metrics
      tr1 = 100.0 * len(np.where(ranks < 1)[0]) / len(ranks)
      tr5 = 100.0 * len(np.where(ranks < 5)[0]) / len(ranks)
      tr10 = 100.0 * len(np.where(ranks < 10)[0]) / len(ranks)
  
      # Text->Images
      ranks = np.zeros(scores_t2i.shape[0])
  
      for index, score in enumerate(scores_t2i):
          inds = np.argsort(score)[::-1]
          ranks[index] = np.where(inds == txt2img[index])[0][0]
  
      # Compute metrics
      ir1 = 100.0 * len(np.where(ranks < 1)[0]) / len(ranks)
      ir5 = 100.0 * len(np.where(ranks < 5)[0]) / len(ranks)
      ir10 = 100.0 * len(np.where(ranks < 10)[0]) / len(ranks)
  
      tr_mean = (tr1 + tr5 + tr10) / 3
      ir_mean = (ir1 + ir5 + ir10) / 3
      r_mean = (tr_mean + ir_mean) / 2
  
      agg_metrics = (tr1 + tr5 + tr10) / 3
  
      eval_result = {
          "txt_r1": tr1,
          "txt_r5": tr5,
          "txt_r10": tr10,
          "txt_r_mean": tr_mean,
          "img_r1": ir1,
          "img_r5": ir5,
          "img_r10": ir10,
          "img_r_mean": ir_mean,
          "r_mean": r_mean,
          "agg_metrics": agg_metrics,
      }
      with open(
          os.path.join(registry.get_path("output_dir"), "evaluate.txt"),
          "a",
      ) as f:
          f.write(json.dumps(eval_result) + "\n")
      return eval_result
  
file_path: lavis/lavis/tasks/retrieval.py
imports: import json
  import logging
  import os
  import numpy
  import torch
  from lavis.common.dist_utils import is_main_process
  from lavis.common.registry import registry
  from lavis.tasks.base_task import BaseTask
label_desc: Use image node_id 5 for calling the RetrievalTask obj's underlying member method code with example usage: obj._report_metrics(scores_i2t, scores_t2i, txt2img, img2txt) and returns: eval_result