class_docstr: Container abstracting a list of callbacks.
class_docstr_tok: ["Container","abstracting","a","list","of","callbacks","."]
docstr: Calls the `on_test_batch_begin` methods of its callbacks.
  
  Arguments:
      batch: integer, index of batch within the current epoch.
      logs: dict. Has keys `batch` and `size` representing the current batch
          number and the size of the batch.
docstr_tok: ["Calls","the","`","on_test_batch_begin","`","methods","of","its","callbacks",".","Arguments",":","batch",":","integer",",","index","of","batch","within","the","current","epoch",".","logs",":","dict",".","Has","keys","`","batch","`","and","`","size","`","representing","the","current","batch","number","and","the","size","of","the","batch","."]
code: def on_test_batch_begin(self, batch, logs=None):
      """Calls the `on_test_batch_begin` methods of its callbacks.
  
      Arguments:
          batch: integer, index of batch within the current epoch.
          logs: dict. Has keys `batch` and `size` representing the current batch
              number and the size of the batch.
      """
      if self._should_call_test_batch_hooks:
          logs = self._process_logs(logs)
          self._call_batch_hook(
              ModeKeys.TEST, "begin", batch, logs=logs
          )
  
imports: import collections
  import logging
  import time
  import typing
  import numpy
  from elegy.callbacks.sigint import SigInt, SigIntMode
  from .callback import Callback
  from .history import History
  from .progbar_logger import ProgbarLogger
label_desc: Use image node_id 17 for calling the CallbackList obj's underlying member method code with example usage: obj.on_test_batch_begin(batch, logs) without return types