code: def eval(
      self,
      summary: objax.jaxboard.Summary,
      epoch: int,
      test: Dict[str, Iterable],
      valid: Optional[Iterable] = None,
  ):
      def get_accuracy(dataset: DataSet):
          accuracy, total, batch = 0, 0, None
          for data in tqdm(dataset, leave=False, desc="Evaluating"):
              x, y = data["image"].numpy(), data["label"].numpy()
              total += x.shape[0]
              batch = batch or x.shape[0]
              if x.shape[0] != batch:
                  # Pad the last batch if it's smaller than expected (must divide properly on GPUs).
                  x = np.concatenate(
                      [x] + [x[-1:]] * (batch - x.shape[0])
                  )
              p = self.eval_op(x)[: y.shape[0]]
              accuracy += (
                  np.argmax(p, axis=1) == data["label"].numpy()
              ).sum()
          return accuracy / total if total else 0
  
      valid_accuracy = 0 if valid is None else get_accuracy(valid)
      summary.scalar("accuracy/valid", 100 * valid_accuracy)
      test_accuracy = {
          key: get_accuracy(value) for key, value in test.items()
      }
      to_print = []
      for key, value in sorted(test_accuracy.items()):
          summary.scalar("accuracy/%s" % key, 100 * value)
          to_print.append(
              "Acccuracy/%s %.2f"
              % (key, summary["accuracy/%s" % key]())
          )
      print(
          "Epoch %-4d  Loss %.2f  %s (Valid %.2f)"
          % (
              epoch + 1,
              summary["losses/xe"](),
              " ".join(to_print),
              summary["accuracy/valid"](),
          )
      )
  
imports: import os
  import pickle
  from typing import Optional, Dict, Iterable, Callable
  import jax
  import jax.numpy
  import numpy
  from absl import flags
  from tqdm import tqdm, trange
  import objax
  from examples.fixmatch.libml.data.core import DataSet
  from objax.util import EasyDict
label_desc: Use image node_id 5 for calling the TrainLoopFSL obj's underlying member method code with example usage: obj.eval(summary, epoch, test, valid) and returns: unknown