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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _construct(self, context):
 """Constructs this by calling the deferred method. This assumes that all unbound_vars have been specified in context and if this layer has already been computed in this context, then the previously constructed value will be returned. Args: context: A dict of UnboundVariables/_DeferredLayers to their values. Returns: The result of calling the given method on this layer. """

    with self.g.as_default():
      if self._pass_through:
        # pylint: disable=protected-access
        return self._pass_through._construct(context)
      current_value = context.get(self, None)
      assert current_value is not _unspecified, 'Circular dependency'
      if current_value is not None:
        return current_value
      context[self] = _unspecified
      method_args = self._replace_deferred(self._method_args, context)
      method_kwargs = self._replace_deferred(self._method_kwargs, context)
      result = self._method(*method_args, **method_kwargs)
      _strip_unnecessary_contents_from_stack(result, set())

      context[self] = result
      return result