code: def set_bulk_size(size):
      """Set size limit on bulk execution.
  
      Bulk execution bundles many operators to run together.
      This can improve performance when running a lot of small
      operators sequentially.
  
      Parameters
      ----------
      size : int
          Maximum number of operators that can be bundled in a bulk.
  
      Returns
      -------
      int
          Previous bulk size.
      """
      prev = ctypes.c_int()
      check_call(
          _LIB.MXEngineSetBulkSize(
              ctypes.c_int(size), ctypes.byref(prev)
          )
      )
      return prev.value
  
file_path: mxnet/python/mxnet/engine.py
imports: import ctypes
  from .base import _LIB, check_call
label_desc: Use image node_id 1 for calling a global function with example usage: set_bulk_size(size) and returns: prev