code: def report(values, observer=None):
      """Reports observed values with the current reporter object.
  
      Any reporter object can be set current by the ``with`` statement. This
      function calls the :meth:`Reporter.report` method of the current reporter.
      If no reporter object is current, this function does nothing.
  
      .. admonition:: Example
  
         The most typical example is a use within links and chains. Suppose that
         a link is registered to the current reporter as an observer (for
         example, the target link of the optimizer is automatically registered to
         the reporter of the :class:`~chainer.training.Trainer`). We can report
         some values from the link as follows::
  
            class MyRegressor(chainer.Chain):
                def __init__(self, predictor):
                    super(MyRegressor, self).__init__(predictor=predictor)
  
                def __call__(self, x, y):
                    # This chain just computes the mean absolute and squared
                    # errors between the prediction and y.
                    pred = self.predictor(x)
                    abs_error = F.sum(abs(pred - y)) / len(x)
                    loss = F.mean_squared_error(pred, y)
  
                    # Report the mean absolute and squared errors.
                    chainer.report({
                        'abs_error': abs_error,
                        'squared_error': loss,
                    }, self)
  
                    return loss
  
         If the link is named ``'main'`` in the hierarchy (which is the default
         name of the target link in the
         :class:`~chainer.training.updaters.StandardUpdater`),
         these reported values are
         named ``'main/abs_error'`` and ``'main/squared_error'``. If these values
         are reported inside the :class:`~chainer.training.extensions.Evaluator`
         extension, ``'validation/'`` is added at the head of the link name, thus
         the item names are changed to ``'validation/main/abs_error'`` and
         ``'validation/main/squared_error'`` (``'validation'`` is the default
         name of the Evaluator extension).
  
      Args:
          values (dict): Dictionary of observed values.
          observer: Observer object. Its object ID is used to retrieve the
              observer name, which is used as the prefix of the registration name
              of the observed value.
  
      """
      reporters = _get_reporters()
      if reporters:
          current = reporters[-1]
          current.report(values, observer)
  
imports: from __future__ import absolute_import
  import collections
  import contextlib
  import copy
  import json
  import threading
  import typing
  import warnings
  import numpy
  import six
  import chainer
  from chainer import backend
  from chainer import configuration
  from chainer import serializer
  from chainer import variable
  import chainerx
label_desc: Use image node_id 4 for calling a global function with example usage: report(values, observer) without return types