class_docstr: The interface of the Notificator. It must at least implement a `send_notification` method.
  The interface is similar to the `notif <https://notificationdoc.ca/index.html>`_ package.
docstr: Abstract method to send a notification.
  
  Args:
      message (str): The message to send as a notification message through the notificator.
      subject (str): The subject of the notification. If None, the default message is used. By default, None.
          Also, we recommend formatting the subject for better readability, e.g. using bolding it using Markdown
          and appending with a new line.
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code: def send_notification(
      self, message: str, *, subject: Union[str, None] = None
  ) -> None:
      """
      Abstract method to send a notification.
  
      Args:
          message (str): The message to send as a notification message through the notificator.
          subject (str): The subject of the notification. If None, the default message is used. By default, None.
              Also, we recommend formatting the subject for better readability, e.g. using bolding it using Markdown
              and appending with a new line.
      """
  
file_path: poutyne/poutyne/framework/callbacks/notification.py
imports: from abc import ABC, abstractmethod
  from typing import Dict, Union
  from poutyne.framework.callbacks.callbacks import Callback
label_desc: Use image node_id 1 for calling the Notificator obj's underlying member method code with example usage: obj.send_notification(message) without return types