code: def after_iteration(self, model, epoch: int, evals_log) -> bool:
      if not evals_log:
          return False
  
      for data, metric in evals_log.items():
          for metric_name, log in metric.items():
              stdv: Optional[float] = None
              if isinstance(log[-1], tuple):
                  score = log[-1][0]
                  stdv = log[-1][1]
              else:
                  score = log[-1]
  
              self._run.track(
                  score,
                  step=0,
                  name=metric_name,
                  context={"stdv": False},
              )
              if stdv is not None:
                  self._run.track(
                      score,
                      step=0,
                      name=metric_name,
                      context={"stdv": True},
                  )
  
      return False
  
file_path: aim/aim/sdk/adapters/xgboost.py
imports: from typing import Optional
  from aim.ext.resource.configs import DEFAULT_SYSTEM_TRACKING_INT
  from aim.sdk.run import Run
label_desc: Use image node_id 5 for calling the AimCallback obj's underlying member method code with example usage: obj.after_iteration(model, epoch, evals_log) and returns: False, False