class_docstr: Keras callback integration.
  Pass an instance of this class to Keras model ``fit`` method as argument ``callbacks``.
  Keras will call relavent mehtods of this class to log metrics.
code: def __init__(self, save_batch_frequency: int = 1):
      super().__init__()
      self.save_batch_frequency = save_batch_frequency
  
file_path: labml/client/labml/utils/keras.py
imports: from typing import Dict, Optional
  import tensorflow
  from labml import tracker, logger
label_desc: Use image node_id 1 to create a new LabMLKerasCallback object from inherited base classes: tf.keras.callbacks with example: obj = LabMLKerasCallback(save_batch_frequency)